Quote:
Originally Posted by spork2367
First off, these are all OHV engines....
But comparing pushrod V8's to OHC V8's (whether single or dual cam) isn't a clear cut "this is better and here's why" comparison.
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Really? Can you provide data of examples where a NA OHV motor
of comparably equal technology and displacement demonstrates equal peak power and superior power under the curve while maintaining a smooth idle? (I referenced the Mercedes M156 6.2L NA as an example of like displacement with like technologies - i.e., cam phasing, etc., and there are others. Example? For example: can you support your claim of comparable OHV being superior to a 25 year old LT5 across the rpm spectrum with a smooth idle?)
Point/Counterpoint.
Quote:
Originally Posted by spork2367
The configuration is largely irrelevant as long as Chevy and Dodge are still putting out pushrod OHV engines that are every bit the equal, if not slightly superior to Ford's modular OHC engines.
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*..."engines that are every bit the equal..."*
Showing us the
data to support that claim (w/ comparable displacement) would help to provide some validity to that statement...
Quote:
Originally Posted by spork2367
Let's face it, if someone can build a pushrod engine for a top fuel dragster that makes 10,000 HP, the cam configuration and pushrods aren't the limiting factor.
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How do those very special application BLOWN motors (rebuilt every 1/4 mile run) have
any relevance to the architecture discussion at hand??
Quote:
Originally Posted by spork2367
And with variable valve timing we can now compensate for a lot of factors and make a single cam do what it never could in the past.
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Granted, VVT is a modern asset to OHV. However, it is even more of an asset to DOHC architecture as the exhaust valve timing can be independent from intake cam lobe timing.
Point/Counterpoint.
Quote:
Originally Posted by spork2367
Direct injection and variable valve timing are far more relevant than cam architecture at this point in time. After that the market is banking on forced induction V6's.
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Well, I refer (again) to the example of the DOHC Mercedes NA M156 which shares those same technological advances AND displacement with GM's current OHV NA LT1. I dunno, but most of legit true apples to apples comparisons of DOHC vs. OHV, proving superiority of the latter is pretty thin in the evidence side of the argument.
Far as blown V6's goes, one only has to see one of the 1/2 mile or 1 mile shootouts to see the truth of
"If you ain't blowin, you ain't goin!" But, those kick-*** Nissan V6s are also DOHC, by the way... But, as Mike already said, hybrids w/ electric FWD may be what really makes DOHC moot - to your Point/Counterpoint.
