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Message: <blockquote data-quote="hachiroku clan" data-source="post: 1063319096" data-attributes="member: 67420">1. Advance timing will give more low-end torque (Intake valves only; on DOHC; all else same)for this question, i think that is because when u advance, the valves will opes sooner/earlier so the in-flow of air-fuel mixture could push the exhaust gases out just before the pistons reach TDC, so as the pistons travel downwards, all thats in the cylinder is 'fresh air-fuel' as the remaining exhaust gases are forced out already. on high-end, the performance is not as good because when the piston is traveling downward on the intake stroke, that is when air-fuel is injected, the combustion that had just happened is STILL causing the gasses to expand thus not allowing the air-fuel mixture to enter the cylinder as much as on low-end (because the pistons are moving very fast, but the the combustion/expansion rate of the previous air-fuel mixture is expanding at its 'normal' rate i:e slower than the pistons) causing a poorer power on high-end.2. Retard timing will give more top-end power (Intake valves only; on DOHC; all else same on high-end, the pistons will start moving downwards BEFORE the intake valves opens. so what happens is the exhaust gases that is still in the combustion chamber will be 'sucked' ( i dunno how to explain this) so as the piston travels downward with both intake & exhaust valves closed the 'extra' exhaust gases will be forced to 'shrink', causing a huge drop in pressure so this creates more vacuum. more vacuum will suck more air-fuel mixture.on low end, there wont be much vacuum created as the exhaust gases are not of the same volume compared to the volume on high-end.this is logically thinking.. but please correct me if im wrong..btw what u said actually contradicts as this site says the opposite.. http://www.my-acoustic.com/Car/engine_head/adjustable_pulleys/adjustable_cam_pulleys.htm</blockquote>

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