DOHC/OHC vs. OHV

[radz28]

Give me pushrods and I'll be happy. Actually, I don't really care either way, I just know they are simpler and it's been proven they are not "lower technology." Hmm... 427 ci and 7000 redline?... Hell, a lot of cam only LS1 guys run to 7000 grand on a stock shortblock and heads. Of course they change the springs, retainers, pushrods and timing chain but still. You don't need need four cams to make power.

[wildpaws]

Originally Posted by The_Beast_

I'll say OHC cause theyre genrally lighter and can produce higher engine speeds than that of OHV 's can. Not to mention better engine performance and even better design flexiblity.

Last time I checked, the Nascar OHV engines were turning 9500+ rpm, how many more rpms do you need? Are they purpose built engines? Sure they are, but no more so than a high revving Ferrari DOHC engine.
Clyde

[DGthe3]

Originally Posted by wildpaws

Last time I checked, the Nascar OHV engines were turning 9500+ rpm, how many more rpms do you need? Are they purpose built engines? Sure they are, but no more so than a high revving Ferrari DOHC engine.
Clyde

And the last time I checked, F1 race engines run about twice that. If you could get a Nascar engine to do that, they'd need restrictor plates at martinsville.

Also, could the person who says that ohc engines are lighter please explain? I have never heard of that being the case. I always hear its the other way around.

[Chevyrocker]

DOHC...

[wildpaws]

Originally Posted by DGthe3

And the last time I checked, F1 race engines run about twice that. If you could get a Nascar engine to do that, they'd need restrictor plates at martinsville.

Also, could the person who says that ohc engines are lighter please explain? I have never heard of that being the case. I always hear its the other way around.

And the last time YOU ran an 18,000 rpm engine on the street was?? I'll let you guys finish arguing it out, quite frankly I find the direction it's going in to be ridiculous.
Clyde

[Mr. Wyndham]

Originally Posted by wildpaws

And the last time YOU ran an 18,000 rpm engine on the street was?? I'll let you guys finish arguing it out, quite frankly I find the direction it's going in to be ridiculous.
Clyde

Wha-?

C'mon! It's the infamous DOHC vs OHV debate firing up here.
It sits in the company of such debates like SS v Z28!!

[boxmonkeyracing]

Y spin the engine faster, with a small displacement, to produce the same amount of power with a larger displacement engine at lower RPMS? you have to spin the engine faster on a DOHC to get the same power out of it. . .

[Chocolate Apocalypse]

Originally Posted by wildpaws

And the last time YOU ran an 18,000 rpm engine on the street was?? I'll let you guys finish arguing it out, quite frankly I find the direction it's going in to be ridiculous.
Clyde

It only started getting ridiculous when you brought purpose built race motors into the equation. Not what this thread is about.
Oh, OHV is my choice.

[Mr. Wyndham]

Originally Posted by boxmonkeyracing

you have to spin the engine faster on a DOHC to get the same power out of it. . .

Just some numbers for consideration:

2002 Camaro LS1: 310hp@5200rpm / 340tq@4000rpm
Mustang mod 4.6L: 300hp@5750rpm / 320tq@4500rpm

[z28camaro2471]

Originally Posted by Jinx

I hate hearing the argument about the OHV being outdated. Its BS. The OHC design dates back about just as far. If GM can produce an engine with larger displacement, manage high 20s in gas mileage, and make mind bending power and potential; then I say dont **** with it.

[Captain Awesome]

Awww come on... a topic isn't truly reached the end until someone makes a comparsion to Nazis.

[DGthe3]

Originally Posted by wildpaws

And the last time YOU ran an 18,000 rpm engine on the street was?? I'll let you guys finish arguing it out, quite frankly I find the direction it's going in to be ridiculous.
Clyde

I've never ran a race engine on the street -Nascar, F1, WRC, NHRA, or other. The point you were making is that ohv engines can make high revs, which they can (I consider anything above 7k high reving). But to put that into perspective, dohc engines are capable of much more. Dont get me wrong, I love Nascar. I've seen a couple races out at MIS. Wish I was there yesterday, it wasn't even broadcast out here. Anyway, back on topic . . .

A fair comparison of DOHC vs OHV would be the 5.7L Toyota engine vs Dodges new 5.7L Hemi. Similar power,similar torque.

[boxmonkeyracing]

Originally Posted by Dragoneye

Just some numbers for consideration:

2002 Camaro LS1: 310hp@5200rpm / 340tq@4000rpm
Mustang mod 4.6L: 300hp@5750rpm / 320tq@4500rpm

I also know several people that have the new GT with that rating. . .and they all say that it doesn't feel like 300 horses compared to my 98 which was rated at 305 hp. which as you can see it's reving a full 500 more times for the tq and 550 more for the hp. . .

[Jinx]

Not to mention the LS1 was unrated. Lol. Most current Mustang GTs would be lucky to make 280 to the wheels.