100% VE is filling the cylinders completely.
Say with the motor stock appearing your gonna run 80% peak VE @2500 rpm. The best the motor fills the cylinders with fuel is 80%. Then lets also say that above that VE drops off pretty fast. At 4000 rpm VE is 60%. Your tourqe will actually be lower at 4000 than at 2500, but you may make more horsepower at 4000 rpm than 2500 rpm. This is because your speed of your engine gives your the power.
In this second scenario lets say we have the motor properly modified for a truck. This time we have 95% VE at 2500 rpm. Tourqe is increased and horsepower is increased from stock. At 4000 rpm VE is 80% and horsepower and tourqe are greatly increased.
In this last and third scenario lets say the motor is wildly souped up for a drag car/truck. At 2500 rpm VE is around 97%, but the amount of fuel flow the heads/cam/induction/exhaust are capable of surpasses what the engine is capable of requiring. The speed of the fuel traveling through the runners is sluggish and tourqe is slightly lower than in the previous motor for this given rpm. At 4000 rpms VE is 95%. Tourqe is very strong and with the combination of higher revs horsepower is through the roof. This point is the VE peak, and also peak tourqe. The speed of the fuel is moving at a good rate. At 6000 rpm VE drops down to say.. 75%. Tourqe drops off, but your engine still has some speed and horsepower still slightly increases. Finally lets say at 8000 rpm the VE drops to 60%. Tourqe finally drops off enough that horsepower drops off as well also. The fuel is moving so fast through the induction and head that it crashes against the bowls of the head. At this point a down shift would pay off.
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93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
Get ready for the 351 boss build this summer, 4v closed chamber heads, 2.25/1.75 valves, .750 lift, 12.5:1 piistons, wieand tunnel ram, nitrous, I think its gonna roar!
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