>>14217181 considering the power, the gm v8 and chrysler v8 get pretty good mpg. Definitely on par with ohc.
in the end what is the most efficient way to move air through engine. If you have small displacement you will need high revolutions.. and ohc will be better. If you can have high displacement, revolutions don't matter as much and a pushrod will work.
personally I think SOHC is probably the most durable and easiest to work on.
>>14217203 the g8 gxp/gt got the same mpg as the m5/550i. Actually it got slightly better i think.
But as you say, mpg really isn't a good indicator of an engines efficiency as it is a measure of the entire car. You need to look at brake specific horsepower, and in that case.. the modern OHV is about the same as the OHC.
>>14217237 Then say they have less valvetrain weight, instead of engine weight. Anyways, it doesn't really matter. Valvetrain weight is only your enemy if you're spinning it up to high RPM (as mentioned in the OP), and you run into valve float. As long as you stay below that point, (7 to 9K, fine for a street engine) you don't need OHC at all.
I'm not talking about a specially ported head, I'm talking about a bone stock, facotry head. Head flow isn't just used for V-ates anyways, it's used to measure port efficiency in ANY engine. If you want to bring up the >better port design argument, be prepared to back it up.
>>14217341 Ford SOHC in that test used 46m valves, Hemi used 50.8mm. That's only a 9% increase in valve curtain. Given the 269cfm the Hemi has stock, that would mean it'd produce about 245cfm with a 46mm valve. That's still on par with the 250 cfm, completely re-engineered Trick Flow units.
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