{"id":3020,"date":"2026-11-09T10:02:07","date_gmt":"2026-11-09T10:02:07","guid":{"rendered":"https:\/\/wpcalc.com\/pt\/vida\/calculadora-taxa-de-compressao-do-motor\/"},"modified":"2026-11-09T10:02:07","modified_gmt":"2026-11-09T10:02:07","slug":"calculadora-taxa-de-compressao-do-motor","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/pt\/vida\/calculadora-taxa-de-compressao-do-motor\/","title":{"rendered":"Calculadora de taxa de compress\u00e3o do motor"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Calcule a taxa de compress\u00e3o est\u00e1tica, a cilindrada e a taxa de compress\u00e3o din\u00e2mica<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"3020\" data-favorite-title=\"Taxa de compress\u00e3o\" data-favorite-url=\"https:\/\/wpcalc.com\/pt\/vida\/calculadora-taxa-de-compressao-do-motor\/\" data-favorite-excerpt=\"Informe di\u00e2metro, curso, n\u00famero de cilindros, volume da c\u00e2mara e dados de junta, pist\u00e3o e deck para obter a taxa de compress\u00e3o est\u00e1tica, a taxa de compress\u00e3o din\u00e2mica e a cilindrada total do motor em cc, litros e polegadas c\u00fabicas.\" aria-label=\"Adicionar aos favoritos\" data-favorite-icon=\"icon icon-roadways\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/pt\/vida\/calculadora-taxa-de-compressao-do-motor\/\" method=\"POST\" class=\"calculator\" id=\"calculator-3020\" data-post=\"3020\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Campos de entrada<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Di\u00e2metro<\/label><div class=\"term\">B<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"dimetro\" id=\"field-1\" aria-describedby=\"calc-info-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"400\" value=\"4\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"in\" selected>in<\/option><option value=\"mm\">mm<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-1\">Di\u00e2metro do cilindro, medido na altura do pist\u00e3o.<\/small><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Curso<\/label><div class=\"term\">S<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"curso\" id=\"field-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"400\" value=\"3.48\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"in\" selected>in<\/option><option value=\"mm\">mm<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-5\">Cilindros<\/label><div class=\"term\">n<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"cilindros\" id=\"field-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"16\" value=\"8\"\/><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-6\">Volume da c\u00e2mara<\/label><div class=\"term\">Vch<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"volume_da_cmara\" id=\"field-6\" aria-describedby=\"calc-unit-6 calc-info-6\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0.1\" max=\"100000\" value=\"64\"\/><div class=\"unit\" id=\"calc-unit-6\">cc<\/div><small id=\"calc-info-6\">Volume da c\u00e2mara de combust\u00e3o no cabe\u00e7ote, por cilindro.<\/small><\/div><div class=\"field\" id=\"input-5\"><label for=\"field-7\">Di\u00e2metro da junta<\/label><div class=\"field-group\"><input type=\"text\" name=\"dimetro_da_junta\" id=\"field-7\" aria-describedby=\"calc-info-7\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"400\" value=\"4.1\"\/><div class=\"grid grid-cols-1\"><select id=\"field-8\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"in\" selected>in<\/option><option value=\"mm\">mm<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-7\">Di\u00e2metro do anel de fogo ou do furo da junta.<\/small><\/div><div class=\"field\" id=\"input-6\"><label for=\"field-9\">Espessura da junta<\/label><div class=\"field-group\"><input type=\"text\" name=\"espessura_da_junta\" id=\"field-9\" aria-describedby=\"calc-info-9\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" max=\"100\" value=\"0.04\"\/><div class=\"grid grid-cols-1\"><select id=\"field-10\" name=\"unit\" aria-label=\"Unit\"><option value=\"in\" selected>in<\/option><option value=\"mm\">mm<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-9\">Espessura comprimida. Use 0 para ignorar a junta.<\/small><\/div><div class=\"field has-term\" id=\"input-7\"><label for=\"field-11\">Volume do pist\u00e3o<\/label><div class=\"term\">Vp<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"number\" name=\"volume_do_pisto\" id=\"field-11\" aria-describedby=\"calc-unit-11 calc-info-11\" min=\"-2000\" max=\"2000\" step=\"0.1\" value=\"-7\"\/><div class=\"unit\" id=\"calc-unit-11\">cc<\/div><small id=\"calc-info-11\">Domo: positivo. C\u00f4ncavo ou rebaixos para v\u00e1lvulas: negativo. O domo reduz o volume morto e o c\u00f4ncavo o aumenta. 0 para topo plano.<\/small><\/div><div class=\"field has-term\" id=\"input-8\"><label for=\"field-12\">Folga do deck<\/label><div class=\"term\">deck<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"number\" name=\"folga_do_deck\" id=\"field-12\" aria-describedby=\"calc-info-12\" min=\"-20\" max=\"400\" step=\"0.001\" value=\"0.015\"\/><div class=\"grid grid-cols-1\"><select id=\"field-13\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"in\" selected>in<\/option><option value=\"mm\">mm<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-12\">Topo do pist\u00e3o abaixo do deck do bloco no PMS. Negativo se o pist\u00e3o ultrapassa o deck.<\/small><\/div><div class=\"is-single field\" id=\"input-9\"><span class=\"font-semibold\">Taxa de compress\u00e3o din\u00e2mica (opcional)<\/span><\/div><div class=\"field has-term\" id=\"input-10\"><label for=\"field-15\">Fechamento da v\u00e1lvula de admiss\u00e3o<\/label><div class=\"term\">IVC<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"fechamento_da_vlvula_de_admisso\" id=\"field-15\" aria-describedby=\"calc-unit-15 calc-info-15\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" max=\"120\" value=\"60\"\/><div class=\"unit\" id=\"calc-unit-15\">\u00b0 ap\u00f3s o PMI<\/div><small id=\"calc-info-15\">Ponto de fechamento efetivo da v\u00e1lvula de admiss\u00e3o, em graus ap\u00f3s o ponto morto inferior.<\/small><\/div><div class=\"field has-term\" id=\"input-11\"><label for=\"field-16\">Comprimento da biela<\/label><div class=\"term\">L<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"comprimento_da_biela\" id=\"field-16\" aria-describedby=\"calc-info-16\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"1\" max=\"400\" value=\"5.7\"\/><div class=\"grid grid-cols-1\"><select id=\"field-17\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"in\" selected>in<\/option><option value=\"mm\">mm<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-16\">Comprimento da biela, centro a centro. Informe junto com o \u00e2ngulo de fechamento da admiss\u00e3o para calcular a taxa din\u00e2mica.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalcular\" id=\"calculate-button\" data-post=\"3020\">Calcular<\/button><button type=\"reset\">Redefinir<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calcular automaticamente<\/label><small>Se ativado, o resultado \u00e9 atualizado automaticamente quando voc\u00ea altera qualquer valor.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Taxa de compress\u00e3o e cilindrada<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Taxa de compress\u00e3o<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\": 1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Cilindrada por cilindro<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"cc\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-3\"><span class=\"field-title\"><span>Cilindrada total<\/span><\/span><span class=\"field-value\" id=\"result-3\" data-unit=\"cc\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-4\"><span class=\"field-title\"><span>Cilindrada total<\/span><\/span><span class=\"field-value\" id=\"result-4\" data-unit=\"litros\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-5\"><span class=\"field-title\"><span>Cilindrada total<\/span><\/span><span class=\"field-value\" id=\"result-5\" data-unit=\"ci\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-6\"><span class=\"field-title\"><span>Taxa de compress\u00e3o din\u00e2mica<\/span><\/span><span class=\"field-value\" id=\"result-6\" data-unit=\": 1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-7\"><span class=\"field-title\"><span>Detalhamento dos volumes<\/span><\/span><span class=\"field-value\" id=\"result-7\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-8\"><span class=\"field-title\"><span>M\u00e9todo e premissas<\/span><\/span><span class=\"field-value\" id=\"result-8\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copiar link para este c\u00e1lculo<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Deixar um coment\u00e1rio<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"3020\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">O que voc\u00ea achou deste resultado?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Curti <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">\u00datil <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confuso <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Decepcionado <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Impreciso <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>F\u00f3rmula da taxa de compress\u00e3o<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">F\u00f3rmula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ CR \\;=\\; \\frac{V_{swept} + V_{clear}}{V_{clear}} \\\\[4pt] V_{swept} \\;=\\; \\frac{\\pi}{4}\\,B^{2}S, \\qquad V_{clear} \\;=\\; V_{ch} + V_{g} + V_{deck} - V_{p} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Onde:<\/strong><\/p>\n<ul>\n<li>\\(B\\) \u2014 di\u00e2metro do cilindro, medido na altura do pist\u00e3o (cm)<\/li>\n<li>\\(S\\) \u2014 curso do pist\u00e3o (cm)<\/li>\n<li>\\(V_{ch}\\) \u2014 volume da c\u00e2mara de combust\u00e3o no cabe\u00e7ote, por cilindro (cc)<\/li>\n<li>\\(V_{g}\\) \u2014 volume da junta do cabe\u00e7ote, \\( \\tfrac{\\pi}{4}B_{g}^{2}t \\), no qual \\(B_{g}\\) \u00e9 o di\u00e2metro da junta (do anel de fogo) e \\(t\\) \u00e9 a espessura comprimida da junta (cc)<\/li>\n<li>\\(V_{deck}\\) \u2014 volume da folga do deck, \\( = \\tfrac{\\pi}{4}B^{2}d \\), no qual \\(d\\) \u00e9 a dist\u00e2ncia entre a coroa do pist\u00e3o e o deck no PMS, positiva quando o pist\u00e3o fica abaixo do deck (cc)<\/li>\n<li>\\(V_{p}\\) \u2014 volume do pist\u00e3o: positivo para domo (abaulado), negativo para c\u00f4ncavo ou rebaixos de v\u00e1lvulas, 0 para topo plano (cc)<\/li>\n<\/ul>\n<p>Todas as medidas lineares s\u00e3o convertidas internamente para cent\u00edmetros, de modo que todos os volumes saem em cc. A f\u00f3rmula expressa a taxa de compress\u00e3o est\u00e1tica: o volume total do cilindro no ponto morto inferior (PMI) dividido pelo volume morto que resta quando o pist\u00e3o est\u00e1 no ponto morto superior (PMS). Um domo no pist\u00e3o remove volume morto; um rebaixo c\u00f4ncavo ou rebaixos de v\u00e1lvula o aumentam.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Taxa de compress\u00e3o \u2013 exemplo de c\u00e1lculo<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemplo:<\/strong> um V8 small-block de 350 pol\u00b3 \u2014 di\u00e2metro de 4 pol, curso de 3,48 pol, 8 cilindros, c\u00e2mara de 64 cc, di\u00e2metro de junta de 4,1 pol, espessura comprimida da junta de 0,04 pol, pist\u00f5es c\u00f4ncavos de 7 cc (informados como \u22127), folga de deck de 0,015 pol, biela de 5,7 pol e v\u00e1lvula de admiss\u00e3o fechando a 60\u00b0 depois do PMI (ABDC). Estes s\u00e3o os valores padr\u00e3o da calculadora.<\/p>\n<p>\\[ V_{swept} = \\tfrac{\\pi}{4}(10.16)^{2}(8.8392) = 716.62\\ \\text{cc} \\]<\/p>\n<p>\\[ V_{clear} = 64 + 8.65 + 3.09 + 7 = 82.74\\ \\text{cc} \\]<\/p>\n<p>\\[ CR = \\frac{716.62 + 82.74}{82.74} = 9.66 \\]<\/p>\n<p><strong>Resultado:<\/strong> taxa de compress\u00e3o est\u00e1tica de 9,66 : 1, taxa de compress\u00e3o din\u00e2mica de 8,00 : 1, cilindrada de 716,62 cc por cilindro e 5.733 cc (5,73 L, 349,8 pol\u00b3) no total.<\/p>\n<p>\n\r\n<\/section>\n<h2>Como usar a calculadora de taxa de compress\u00e3o<\/h2>\n<ol>\n<li>Informe o <strong>di\u00e2metro<\/strong> e o <strong>curso<\/strong> de um cilindro e escolha entre polegadas e mil\u00edmetros nos menus de unidades.<\/li>\n<li>Defina os <strong>cilindros<\/strong> (1\u201316) para que a calculadora some a cilindrada total do motor.<\/li>\n<li>Informe o <strong>volume da c\u00e2mara<\/strong> em cc \u2014 o volume da c\u00e2mara de combust\u00e3o no cabe\u00e7ote, por cilindro. Se o valor n\u00e3o estiver publicado, me\u00e7a-o \"fazendo o cc\" do cabe\u00e7ote com uma bureta.<\/li>\n<li>Informe o <strong>di\u00e2metro da junta<\/strong> (o anel de fogo ou a abertura da junta) e a <strong>espessura da junta comprimida<\/strong>; use 0 para ignorar a junta.<\/li>\n<li>Informe o <strong>volume do pist\u00e3o<\/strong>: positivo para domo (abaulado), negativo para c\u00f4ncavo ou rebaixos de v\u00e1lvulas, 0 para topo plano.<\/li>\n<li>Informe a <strong>folga do deck<\/strong> \u2014 positiva quando o topo do pist\u00e3o fica abaixo do deck do bloco no PMS, negativa se o pist\u00e3o sobressai acima do deck.<\/li>\n<li>Para a taxa din\u00e2mica, preencha o <strong>fechamento da v\u00e1lvula de admiss\u00e3o<\/strong> (graus depois do PMI) e o <strong>comprimento da biela<\/strong> (centro a centro). Deixe qualquer um dos dois campos vazio para pular o resultado din\u00e2mico.<\/li>\n<li>Leia a <strong>taxa de compress\u00e3o<\/strong>, a <strong>cilindrada<\/strong> em cc, litros e polegadas c\u00fabicas e o detalhamento de volumes, que mostra exatamente de onde vem cada cc do volume morto.<\/li>\n<\/ol>\n<h2>O que \u00e9 a taxa de compress\u00e3o?<\/h2>\n<p>A taxa de compress\u00e3o (CR) compara o volume dentro do cilindro quando o pist\u00e3o est\u00e1 no ponto morto inferior (PMI) com o volume que resta quando ele chega ao ponto morto superior (PMS). Uma taxa de 9,66 : 1 significa que a mistura ar-combust\u00edvel \u00e9 comprimida para cerca de um d\u00e9cimo do volume original antes de a fa\u00edsca saltar. \u00c9 uma grandeza puramente geom\u00e9trica: fica definida pelo di\u00e2metro, pelo curso, pelo tamanho da c\u00e2mara, pela junta, pelo formato da coroa do pist\u00e3o e pela altura do deck \u2014 e n\u00e3o pelo acerto.<\/p>\n<p>A taxa de compress\u00e3o \u00e9 importante porque determina, ao mesmo tempo, a efici\u00eancia t\u00e9rmica e a exig\u00eancia de octanagem. Uma taxa mais alta extrai mais trabalho de cada unidade de combust\u00edvel, gerando mais torque e reduzindo o consumo, mas tamb\u00e9m eleva a press\u00e3o e a temperatura de pico no cilindro, o que empurra o motor para a detona\u00e7\u00e3o (a \"batida de pino\"). Escolher a taxa \u00e9, portanto, uma quest\u00e3o de equil\u00edbrio: construa o motor com toda a compress\u00e3o que o combust\u00edvel que voc\u00ea pretende usar conseguir suportar.<\/p>\n<p>A taxa est\u00e1tica acima \u00e9 s\u00f3 metade da hist\u00f3ria. Num motor em funcionamento, o cilindro s\u00f3 fica selado quando a v\u00e1lvula de admiss\u00e3o fecha, ent\u00e3o um comando com fechamento atrasado da admiss\u00e3o deixa parte da carga escapar de volta pelo duto antes de a compress\u00e3o efetiva come\u00e7ar. A <em>taxa de compress\u00e3o din\u00e2mica<\/em> (DCR) captura isso: ela \u00e9 calculada com o volume realmente aprisionado a partir do ponto efetivo de fechamento da v\u00e1lvula de admiss\u00e3o, usando o comprimento da biela e a posi\u00e7\u00e3o exata do pist\u00e3o no mecanismo biela-manivela. Um comando de longa dura\u00e7\u00e3o derruba a DCR para bem abaixo do valor est\u00e1tico \u2014 por isso comandos de competi\u00e7\u00e3o e gasolina de posto raramente combinam com taxas est\u00e1ticas altas.<\/p>\n<p>Como refer\u00eancia, a maioria dos motores de rua abastecidos com gasolina de posto funciona melhor com taxa din\u00e2mica na faixa de 7,5 : 1 a 8,5 : 1. A tabela de detalhamento de volumes do resultado mostra cada componente separadamente \u2014 c\u00e2mara, junta, deck e pist\u00e3o \u2014 para voc\u00ea ver qual mudan\u00e7a (uma junta mais fina, um cabe\u00e7ote rebaixado na usinagem, um pist\u00e3o diferente) altera a taxa e em quanto.<\/p>\n<h2>Premissas, limita\u00e7\u00f5es e dicas pr\u00e1ticas<\/h2>\n<ul>\n<li>Use volumes de c\u00e2mara <strong>medidos<\/strong> sempre que poss\u00edvel. As c\u00e2maras \"nominais\" publicadas costumam variar de 1 a 3 cc, o que j\u00e1 basta para alterar a taxa em v\u00e1rios d\u00e9cimos.<\/li>\n<li>Informe sempre a espessura da junta <strong>comprimida<\/strong>, e n\u00e3o a espessura como ela \u00e9 fornecida. Uma junta com 0,04 pol instalada pode medir 0,06 pol na caixa.<\/li>\n<li>Aten\u00e7\u00e3o \u00e0s conven\u00e7\u00f5es de sinal: o domo \u00e9 positivo e <em>reduz<\/em> o volume morto; o c\u00f4ncavo \u00e9 negativo e o <em>aumenta<\/em>. Um pist\u00e3o que sobressai acima do deck recebe folga de deck negativa.<\/li>\n<li>Se o volume morto chegar a zero, o resultado \u00e9 inv\u00e1lido \u2014 um domo exagerado, um pist\u00e3o saliente ou uma c\u00e2mara vazia n\u00e3o deixam nada para comprimir.<\/li>\n<li>A taxa din\u00e2mica \u00e9 uma estimativa geom\u00e9trica. Ela ignora as rampas dos eventos de v\u00e1lvula, a press\u00e3o do coletor, a altitude e a temperatura da carga; trate-a como um guia para escolher o comando, n\u00e3o como uma medida da press\u00e3o de compress\u00e3o.<\/li>\n<li>A \u00e1rea de quench, o ponto de igni\u00e7\u00e3o, a temperatura do l\u00edquido de arrefecimento e o desenho da c\u00e2mara de combust\u00e3o afetam a detona\u00e7\u00e3o tanto quanto a pr\u00f3pria taxa; portanto, a tabela de combust\u00edveis abaixo \u00e9 s\u00f3 um ponto de partida.<\/li>\n<\/ul>\n<table>\n<thead>\n<tr>\n<th>CR est\u00e1tica<\/th>\n<th>Combust\u00edvel t\u00edpico<\/th>\n<th>Uso t\u00edpico<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>8,0\u20139,5 : 1<\/td>\n<td>Comum, octanagem 87<\/td>\n<td>Motores originais e cl\u00e1ssicos; prepara\u00e7\u00f5es de rua com sobrealimenta\u00e7\u00e3o<\/td>\n<\/tr>\n<tr>\n<td>9,5\u201310,5 : 1<\/td>\n<td>Da octanagem m\u00e9dia \u00e0 premium<\/td>\n<td>Motor de rua aspirado t\u00edpico; cabe\u00e7otes de ferro pedem a parte baixa da faixa<\/td>\n<\/tr>\n<tr>\n<td>10,5\u201312,0 : 1<\/td>\n<td>De premium a octanagem 100 ou mais<\/td>\n<td>Cabe\u00e7otes de alum\u00ednio, quench apertado, acerto cuidadoso<\/td>\n<\/tr>\n<tr>\n<td>Acima de 12 : 1<\/td>\n<td>Combust\u00edvel de corrida ou E85<\/td>\n<td>Motores de competi\u00e7\u00e3o<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Com o motor remontado e rodando de novo, a nossa <a href=\"https:\/\/wpcalc.com\/pt\/vida\/calculadora-custo-combustivel-viagem\/\">calculadora de custo de combust\u00edvel<\/a>, a <a href=\"https:\/\/wpcalc.com\/pt\/vida\/calculadora-de-consumo-de-combustivel\/\">calculadora de consumo de combust\u00edvel<\/a> e a <a href=\"https:\/\/wpcalc.com\/pt\/vida\/calculadora-proxima-revisao-do-carro\/\">calculadora de manuten\u00e7\u00e3o programada do carro<\/a> ajudam voc\u00ea a acompanhar os custos do dia a dia para rodar com ele.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Informe di\u00e2metro, curso, n\u00famero de cilindros, volume da c\u00e2mara e dados de junta, pist\u00e3o e deck para obter a taxa de compress\u00e3o est\u00e1tica, a taxa de compress\u00e3o din\u00e2mica e a cilindrada total do motor em cc, litros e polegadas c\u00fabicas.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9],"tags":[81],"class_list":["post-3020","post","type-post","status-publish","format-standard","hentry","category-vida","tag-carro-viagem"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/3020","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/comments?post=3020"}],"version-history":[{"count":0,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/3020\/revisions"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/media?parent=3020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/categories?post=3020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/tags?post=3020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}