Racing engines

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This may contain: an image of the gear on top of each other and below it are pictures of different gears
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3d cad Degingin engineering works
How Pop & Bang, burble or crackle tunes achieve these sounds by delaying the retarding of injection
Pop & Bang or crackle tunes achieve these sounds by delaying the retarding of fuel injection after TDC into the engine. This essentially means that excess fuel is injected into the combustion chamber for a short period of time after letting off the throttle. The ignition timing is then altered to combust the unburnt fuel during the exhaust stroke instead of the compression stroke, when the exhaust valves are opened, resulting in the pops and burbles you hear exiting out your exhaust system.