Volumetric efficiency/ power production
09-30-2003, 10:57 PM
#1
Volumetric efficiency/ power production At any point in time, a 346 motor making 404.5 lbft of torque is operating at 100% VE whether it be 400 or 6400 rpm.
thees no way a long runner intake will support making a 102ve happen at peak power is there?, peak torque is pretty easy most of these motor are hitting 100 ve at torque peak (404ft lb)
what the highest rpm an ls1 has maintained 100%ve until? my guess is probably 5300 rpm max, then it starts falling off.
It woudl take 501 hp at 6500 or 539 hp at 7000 to hit 100%ve. Thats frigggen unreal.
thees no way a long runner intake will support making a 102ve happen at peak power is there?, peak torque is pretty easy most of these motor are hitting 100 ve at torque peak (404ft lb)
what the highest rpm an ls1 has maintained 100%ve until? my guess is probably 5300 rpm max, then it starts falling off.
It woudl take 501 hp at 6500 or 539 hp at 7000 to hit 100%ve. Thats frigggen unreal.
09-30-2003, 11:46 PM
#2
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Re: Volumetric efficiency/ power production Volumetric Effeciency is only telling you how much air the engine is ingesting vs. what a theoretically ideal engine in the same situation would ingest.
What the engine does with that air is another matter - the torque produced is going to depend on chamber design, flame speed, what the rotating assembly is doing, etc. You can't really make a generic statement that a xxx displacement engine at yy VE will make zzz horsepower/torque. You can only say that a given engine at a given VE will flow a specific amount of air.
What the engine does with that air is another matter - the torque produced is going to depend on chamber design, flame speed, what the rotating assembly is doing, etc. You can't really make a generic statement that a xxx displacement engine at yy VE will make zzz horsepower/torque. You can only say that a given engine at a given VE will flow a specific amount of air.
10-01-2003, 06:53 AM
#3
Re: Volumetric efficiency/ power production FWIW, most H/C cars will land around 85 to 90% at WOT.
100% VE is very hard to obtain on a N/A engine (especially a 2 valve setup like ours). Typically, you will only see 100+ VE numbers on race only (read: no low end) applications.
100% VE is very hard to obtain on a N/A engine (especially a 2 valve setup like ours). Typically, you will only see 100+ VE numbers on race only (read: no low end) applications.
