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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Back Fire
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<blockquote data-quote="Higgs Boson" data-source="post: 1262641" data-attributes="member: 27317"><p>A backfire does not happen in the exhaust. A backfire is a "back-fire" meaning flowing backwards, in other words, combustion occuring in the intake manifold, which was a thing with carburators and an intake manifold full of fuel, not fuel injected engines and definitely not direct injected engines.</p><p></p><p>What causes popping in the exhaust is retarded spark timing and also retarded exhaust valve closing causing combustion to occur late and with an open exhaust valve making audible popping. Going from acceleration to sudden closed throttle is a good way to produce it. Current Jaguars and Range Rovers (SVR's especially) pop like crazy on decel, tuned in by the factory calibrators because it sounds awesome.</p></blockquote><p></p>
[QUOTE="Higgs Boson, post: 1262641, member: 27317"] A backfire does not happen in the exhaust. A backfire is a "back-fire" meaning flowing backwards, in other words, combustion occuring in the intake manifold, which was a thing with carburators and an intake manifold full of fuel, not fuel injected engines and definitely not direct injected engines. What causes popping in the exhaust is retarded spark timing and also retarded exhaust valve closing causing combustion to occur late and with an open exhaust valve making audible popping. Going from acceleration to sudden closed throttle is a good way to produce it. Current Jaguars and Range Rovers (SVR's especially) pop like crazy on decel, tuned in by the factory calibrators because it sounds awesome. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
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Back Fire
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