{"id":8909,"date":"2024-08-03T20:42:47","date_gmt":"2024-08-03T12:42:47","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=8909"},"modified":"2024-08-03T20:58:05","modified_gmt":"2024-08-03T12:58:05","slug":"too-lean-too-rich-ccm-best-power-best-economy","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/too-lean-too-rich-ccm-best-power-best-economy\/","title":{"rendered":"Too lean, Too rich, CCM, Best power, Best economy"},"content":{"rendered":"<p><a href=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/CCM-Best-Power-Best-economy-range.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-8911\" src=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/CCM-Best-Power-Best-economy-range.png\" alt=\"\" width=\"673\" height=\"654\" \/><\/a><\/p>\n<p><em>Notes:<\/em><\/p>\n<p><em>The <strong>carburettor<\/strong> measures the <strong>weight<\/strong> of air passing through the induction manifold and uses this measurement to regulate<\/em><br \/>\n<em>the amount of fuel discharged into the air stream (according to a predetermined schedule).<\/em><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">What&#8217;s rich, lean and CCM?<\/span><\/p>\n<p><strong>Rich<\/strong>: 1:8<\/p>\n<p>Chemically Correct fuel\/air Mixture (<strong>CCM<\/strong>): 1:15<\/p>\n<p><strong>Lean<\/strong>: 1:20<\/p>\n<p>&nbsp;<\/p>\n<p>In theory, the &#8216;correct&#8217; quantity of fuel to mix with the air for complete burning, is one part of fuel to 15 parts of air, i.e., a fuel\/air ratio of 0.067 (1:15).<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">How to achieve <strong>&#8220;best power&#8221;<\/strong> setting?<\/span><\/p>\n<ul>\n<li><strong>slightly richer than CCM<\/strong>\u00a0(because of complex chemical reactions associated with the predominance of<br \/>\nnitrogen in the air &#8211; beyond the scope of this book)<\/li>\n<li>coincides with maximum cylinder head temperature (CHT)<\/li>\n<li>In practice, best power from 0.074 to 0.080 (1:13.5 to 1:12.5)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">How to achieve<strong> &#8220;best economy&#8221;<\/strong> setting?<\/span><\/p>\n<ul>\n<li>achieved at fuel\/air ratios at and <strong>just leaner than CCM<\/strong><\/li>\n<li>also means &#8220;Minimum specific fuel consumption&#8221;<\/li>\n<li>In practice, best economy from 0.060 to 0.067 (1:16.5 to 1:15)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Notes: The carburettor measures the weight of air passing through the induction manifold and uses this measurement to regulate the amount of fuel discharged into the air stream (according to a predetermined schedule). &nbsp; What&#8217;s rich, lean and CCM? Rich: 1:8 Chemically Correct fuel\/air Mixture (CCM): 1:15 Lean: 1:20 &nbsp; In theory, the &#8216;correct&#8217; quantity<a class=\"read-more \" href=\"https:\/\/tommykwan.com\/blog\/aviation\/too-lean-too-rich-ccm-best-power-best-economy\/\" title=\"Read More\"> <span class=\"button default\">Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[75,64],"tags":[],"class_list":["post-8909","post","type-post","status-publish","format-standard","hentry","category-agk-airframe-engine-system","category-aviation"],"_links":{"self":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/8909","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/comments?post=8909"}],"version-history":[{"count":6,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/8909\/revisions"}],"predecessor-version":[{"id":8916,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/8909\/revisions\/8916"}],"wp:attachment":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/media?parent=8909"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/categories?post=8909"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/tags?post=8909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}