OHC vs. OHV
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Senior User
Joined: Nov 2003
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From: Peoria, IL
OHC vs. OHV
First off, everyone means that OHV refers to a pushrod engine.
All modern engines that I know of have overhead valves. That said, isn't it a bit redundant to say OHV? It's like "duh."
All modern engines that I know of have overhead valves. That said, isn't it a bit redundant to say OHV? It's like "duh."
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Joined: Nov 2003
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From: Winnipeg, Manitoba
Al, I think what BVFD1983 is saying is that every engine today has the valves overhead. Both OHC and pushrod engines put the valves at the top of the combustion chamber so technically, "OHV" is meaningless in differentiating between the two. Most of us have grown to accept what OHV means though.
Post Fiend
Joined: Jun 2001
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From: Running Springs CA
It is not totally meaninless because many small equipment engines are still flathead. While OHC may be good for high rpms, pushrod, or OHV, engines produce plenty of power. The new Corvette Z06 will get 500hp from a 7.0L non-boosted pushrod engine. Dodge "Hemi" is another example. The Navistar diesel in the SuperDuties is no slouch either.
Jim
Jim
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Senior User
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From: Peoria, IL
Originally Posted by jimandmandy
The new Corvette Z06 will get 500hp from a 7.0L non-boosted pushrod engine.
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Elder User
Joined: Dec 2004
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From: Eastern Iowa
Why would they have to when the get 500+ horsepower out of 5.4 liters in the GT?? The correct question may be "Why doesen't Chevy use OHC?"
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Senior User
Joined: Nov 2003
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From: Peoria, IL
I was referring to the "non-boosted" in the post.
Why can't Ford make a naturally aspirated engine with 400 hp and 400 ft. lbs?
Then the buyer can add a blower or turbo like Lingenfelter does. Those cars are BAD!
Why can't Ford make a naturally aspirated engine with 400 hp and 400 ft. lbs?
Then the buyer can add a blower or turbo like Lingenfelter does. Those cars are BAD!
Posting Guru
Joined: Jun 1999
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From: Everett, Wa
That is a mis-conception, they just don't add a blower or turbo. They rebuild the entire engine. Stock compression of the LS2 is 11 to 1. You can't add a blower or turbo with that type of compression unless you are going to run race fuel. So for about 7k you get 100 more HP and only 40lbs more torque.
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Senior User
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From: Peoria, IL
Originally Posted by NickFordMan
People say a lot of things. I think this whole thread is redundant. Why argue against using OHV?
DOHC = OHV
Why can't the common words for them be DOHC and pushrod?
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I think its a simple matter of history. First, engines were "flat". Then the wonderful technology of over head valves came along. So, to differentiate the two, they called em OHV. Then, they decide to put the cams up top as well. So, to differentiate, they called it OHC. If there were only two types of engines (OHV and OHC) then OHV would be redundant. Since there are not, OHV is needed.
So, they said OHV to distinguish between it and flat head engines. Then OHC to distinguish from the other two.
So, they said OHV to distinguish between it and flat head engines. Then OHC to distinguish from the other two.