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FirebirdMost useless measurement ever conceived.
That is all.
neanderthalits a good measurement of volumetric efficiency.
id take a nice 400hp V8 over a 185hp one. wouldnt you?![]()
thats volumetric efficiency.
///M-SpecPower/liter is useful to race car engineers whose design parameters include getting the most power out of whatever displacement the rules specify.
FirebirdBut it isn't particularly useful outside of racing.
///M-SpecBut outside of racing, power/liter is over emphisized by too many people, IMO. Especially young people in the 'tuning community'.
///M-SpecYou did read my post beyond the first sentence, right?
FirebirdVolumetric efficiency is the ratio of the actual volumetric flow rate over the theoretical volumetric flow rate (displacement).
Specific output is power per unit displacement.
And I would want a 400hp V8 over a 185hp V8. Then again, the 400hp V8 could be a 10L turbodiesel designed for heavy duty applications, weighing only, oh... 3,000lbs or so.... and the 185hp V8 could be something like a Buick/Rover 215 V8, whichs weighs about 315lbs.
Or the 400hp V8 could be a GM LS6, which weighs about 500lbs w/ a Tremec T-56 attached, but it also much smaller than the Mustang Cobra's 4.6L DOHC V8 (which is absolutely enormous by the way. We're talking about the same size as an old FE block V8, and those could have displacements up to 460c.i.).
Ottomanhahaha
ahh I remember discussin this long and hard with your firebird..
decided to dig it outta the grave huh?![]()
neanderthalconsidering GM had a pathetic 185 hp 5.7 liter small block back in the dark days of the early eighties, i was actually thinking about a typical chevy small block.
Firebird seems to be the only person in this thread who has a clue what volumetric efficiency means. It has nothing to do with the physical size of the engine.FirebirdVolumetric efficiency is the ratio of the actual volumetric flow rate over the theoretical volumetric flow rate (displacement).
FirebirdIt deserves its own thread.
It's all relative. A 1980 Civic 1500GL had a 67hp 1.5L four-banger. Your average modern day Civic has 115hp out 1.7L. A 1980 Porsche 911SC had 172hp, while a new Carrera has 315.
Are these newer engines better because they have higher specific output? No. They're better becase they're simply more powerful.
HP/L does NOT measue efficiency.neanderthaltheres a saying; theres no replacement for displacement. why dont they just make it a bigger engine? that way we could all drive 13 liter cars until someone decides that is not enough.
oh wait, fuel economy. emissions. costs. durability. and so on. things that have to be considered when deciding what engine should power a car. where in the range the car should be. these limitations require efficiency. and hp/liter is a good measure (ratio) of it. stop being dumb.![]()
neanderthaltheres a saying; theres no replacement for displacement. why dont they just make it a bigger engine? that way we could all drive 13 liter cars until someone decides that is not enough.
oh wait, fuel economy. emissions. costs. durability. and so on. things that have to be considered when deciding what engine should power a car. where in the range the car should be. these limitations require efficiency. and hp/liter is a good measure (ratio) of it.
stop being dumb.![]()
neanderthalyour little table proves nothing.
what i said still stands, when all the factors are considered, efficiency is still a good "measure."