Quote:

Originally Posted by Louie83

But, I like to mention the stroke part because we have a whole generation that think Honda is superior to domestics because they don’t understand engines or physics. Go to streetfire or some universal car site, and there are non-stop domestic vs import arguments, with the import crowd using HP/L as their crutch in every situation.

100 horsepower per liter naturally aspirated - LS1TECH - Camaro and Firebird Forum Discussion

It’s interesting that we (they) are measuring efficiency as output per liter of displacement. Why? Where does that come from?

Well, Europe has always been oil-poor. So, to prevent their balance of payments from getting out of whack, the Europeans started very early on to encourage excellent fuel economy. The “encouragement” took the form of high gasoline taxes, and also highly progressive yearly registration taxes on vehicles based on…you guessed it, engine displacement. Actually, they started out trying to tax horsepower directly, but the manufacturers played shenangians with their “advertised” ratings (surprise!) and the governments soon turned to something that could be easily measured.

The USA, being oil-rich, never went down that path. The size and power of our cars are not “artificially” constrained by onerous taxes, so our engineering solutions have been “more correct”, in that they are solutions to meet the needs of the purchasers, not the Gov’t. Well, until the late ’60s, anyways.

From an engineering point of view, it would be much more interesting to talk about the power/$$ (both production and maintenance), or the power/weight, or the power/size, or the power/fuel used. Those are all relevant criteria when selecting an engine for an application. But power/displacement? An arbitrary measurement brought to you entirely by the tax man and racing commissioners, both of whom are looking for something that’s easy to measure, not necessarily something that’s real-world relevant, or that has anything to do with engineering.

Heh, nothing new about automotive enthusiasts that don’t really understand why things work the way they do. “3/4-race” cam, anyone?It’s interesting that we (they) are measuring efficiency as output per liter of displacement. Why? Where does that come from?Well, Europe has always been oil-poor. So, to prevent their balance of payments from getting out of whack, the Europeans started very early on to encourage excellent fuel economy. The “encouragement” took the form of high gasoline taxes, and also highly progressive yearly registration taxes on vehicles based on…you guessed it, engine displacement. Actually, they started out trying to tax horsepower directly, but the manufacturers played shenangians with their “advertised” ratings (surprise!) and the governments soon turned to something that could be easily measured.The USA, being oil-rich, never went down that path. The size and power of our cars are not “artificially” constrained by onerous taxes, so our engineering solutions have been “more correct”, in that they are solutions to meet the needs of the purchasers, not the Gov’t. Well, until the late ’60s, anyways.From an engineering point of view, it would be much more interesting to talk about the power/$$ (both production and maintenance), or the power/weight, or the power/size, or the power/fuel used. Those are all relevant criteria when selecting an engine for an application. But power/displacement? An arbitrary measurement brought to you entirely by the tax man and racing commissioners, both of whom are looking for something that’s easy to measure, not necessarily something that’s real-world relevant, or that has anything to do with engineering.

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