Volumetric efficiency from hp
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Volumetric efficiency from hp
Is there a formula to estimate VE% based on engine HP?
Engine is a 1600cc, 12:1cr, peaking at ~8000rpm 220hp.
Engine is a 1600cc, 12:1cr, peaking at ~8000rpm 220hp.
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Re: Volumetric efficiency from hp
as per superflow 110 manual68corvette wrote: ↑Fri Aug 30, 2019 4:02 pm Is there a formula to estimate VE% based on engine HP?
Engine is a 1600cc, 12:1cr, peaking at ~8000rpm 220hp.
ESTIMATED VOLUMETRIC EFFICIENCY FOR GASOLINE BURNING ENGINES
volumetric efficiency = 5600 x HP x 100% / (RPM x CID)
volumetric efficiency = 123 x KW x 100% /(RPM x LITERS)
ESTIMATED VOLUMETRIC EFFICIENCY FOR ALCOHOL BURNING ENGINES
volumetric efficiency = 4750 x HP x 100% / (RPM x CID)
volumetric efficiency = 104 x KW x 100% /( RPM x LITERS)
i converted from cc to ci and done the math,the manual says if your calculations go beyond 130 % for naturally aspirated the power or rpm inputs are incorrect.
hope this helps.
steve c
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Re: Volumetric efficiency from hp
FWIW OP is achieving 160% vol eff per dynojet formulae posted by others.
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Re: Volumetric efficiency from hp
97.64 ci - 220 HP @ 8000
Now I need to guess at a few things. So lets say the A/F ratio was 13:1 and the engine had a BSFC of .44 and 1.0 Correction Factor then the VE = 121.6%
Stan
Now I need to guess at a few things. So lets say the A/F ratio was 13:1 and the engine had a BSFC of .44 and 1.0 Correction Factor then the VE = 121.6%
Stan
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Re: Volumetric efficiency from hp
Plausible but....
That combination would result in a BMEP of 15.4 bar. That is Formula One territory.
Very unlikely for a two valve engine but possible for a very, very, well developed 4 valve engine.
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Re: Volumetric efficiency from hp
This engine is a Z16XE, 16 valve engine.
It is my friends engine, I just ported head, specified camshafts and intake / exhaust manifold dimensions.
Dyno graph is identical to Vanniks simulator, but it does not give VE% and I am qurious if ther would be more to be gained.
Engine noses over now after 8200rpm and owner is making some changes as it should pull to 9500rpm.
There are 2L engines making more HP per liter at same RPM, but those have been measured with race gasoline.
Personally I am happy with the results, but there seems to be still room to improve if we are now at 121VE%, so better to continue development. I am sure competition does
It is my friends engine, I just ported head, specified camshafts and intake / exhaust manifold dimensions.
Dyno graph is identical to Vanniks simulator, but it does not give VE% and I am qurious if ther would be more to be gained.
Engine noses over now after 8200rpm and owner is making some changes as it should pull to 9500rpm.
There are 2L engines making more HP per liter at same RPM, but those have been measured with race gasoline.
Personally I am happy with the results, but there seems to be still room to improve if we are now at 121VE%, so better to continue development. I am sure competition does
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Re: Volumetric efficiency from hp
Nice result.
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Re: Volumetric efficiency from hp
From the dynograph I can not see the 220hp/ 8000rpm.68corvette wrote: ↑Sat Aug 31, 2019 3:37 pm Lets see if this works, I put the dyno graph to instagram:
There is 218.8 hp/ 8480 rpm. That is plausible.
Re: Volumetric efficiency from hp
215 hp at 8000 rpm is still a great result.
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Re: Volumetric efficiency from hp
68Corvette, tell us more about this engine-----Bore and stroke, induction setup, exhaust, etc. Mark H