6.2 vs 5.0

[Enduring]

Originally Posted by guerrillakilla13

ohhhh okay. So Pushrods require much less space up top than, say, DOHC would need. duh I guess. If i'm correct, I believe our cars have two valves per cylinder where as others mostly go for four valves per cylinder. This would explain why 5.0 is DOHC?

The majority of engines that have more than two valves per cylinder are DOHC, but a DOHC is called so because of the number and positioning of the cams not the valves. It is possible for a DOHC engine to only have two valves per cylinder and SOHC and pushrod engines to have more than two, but it's pretty rare. A DOHC V8 has two overhead cams per cylinder bank for a total of four cams. In the 5.0 each cam drives two valves, one camshaft for the intake valves and one for the exhaust valves.

The LS3 only has 16 valves and one camshaft compared to the 5.0s 32 valves and four camshafts. This is one of the reasons why the LS3 weighs less and is cheaper to do a camshaft upgrade on.

This video explains the difference between DOHC, SOHC and pushrods pretty well:

[MagnumForceGB]

Originally Posted by Enduring

Yes, in order to have more than two valves per cylinder the engine must be a DOHC, but a DOHC is called so because of the number and positioning of the cams not the valves. It is possible for a DOHC engine to only have two valves per cylinder, but it's pretty rare. A DOHC V8 has two overhead cams per cylinder bank for a total of four cams. In the 5.0 each cam drives two valves, one camshaft for the intake valves and one for the exhaust valves.

The LS3 only has 16 valves and one camshaft compared to the 5.0s 64 valves and four camshafts. This is one of the reasons why the LS3 weighs less and is cheaper to do a camshaft upgrade on.

This video explains the difference between DOHC, SOHC and pushrods pretty well:

Uhh.... Don't think the 5.0 has 8 valves per cylinder. It is 32 valves.

Also, SOHC can have 3 valves per cylinder, the 4.6L V8 had it.

DOHC allows you to change the timing of both intake and exhaust cams broadening the torque curve.

[Enduring]

Originally Posted by MagnumForceGB

Uhh.... Don't think the 5.0 has 8 valves per cylinder. It is 32 valves.

Also, SOHC can have 3 valves per cylinder, the 4.6L V8 had it.

DOHC allows you to change the timing of both intake and exhaust cams broadening the torque curve.

Yup, you're right it's 32 not 64. I did my math wrong.

[cbass]

Originally Posted by guerrillakilla13

ohhhh okay. So Pushrods require much less space up top than, say, DOHC would need. duh I guess. If i'm correct, I believe our cars have two valves per cylinder where as others mostly go for four valves per cylinder. This would explain why 5.0 is DOHC?
.

Yes, pushrod motors tend to be more compact than DOHC motors. Here is a picture of DOHC vs a pushrod motor from another thread:



Most of this was already covered here:

http://www.camaro5.com/forums/showth...=300699&page=4

[MagnumForceGB]

Originally Posted by Enduring

Yup, you're right it's 32 not 64. I did my math wrong.

I just remembered because there is a "32V" on the engine cover.

The 5.0 is a huge engine, barely fits in the Mustang. I'm waiting for the EPA to throw a hissy fit and the 6.2 and 5.0 get neutered back to 150 HP.

[BigBoyBlue]

Originally Posted by Dfault

My 2010 walked a 2014 5.0 both had same mods too.

Cai
Lt headers
Tune he just couldn't pull on me like I did him. Of course it was a close race until I got to top of 3rd and kept walking away.

Stock with comparable drivers and the 5.0 wins 90% of the time. It has a better power to weight ratio than the SS and thus is faster in a straight line. It's a great engine.

The larger displacement of the 6.2 enables it to have a higher ceiling when modded.

That Coyote 5.0 engine is really large. On "Fast n Loud" they put one into a old big Ford (I think a Galaxie) and the engine barely fit. I couldn't believe it.

[cbass]

Originally Posted by BigBoyBlue

Stock with comparable drivers and the 5.0 wins 90% of the time. It just has a better power to weight ratio than the SS and thus is faster in a straight line. It's a great engine.

So this was just talking about the 6.2 vs the 5.0. When it comes to racing there are other factors than horsepower. Weight. Traction. Gearing. Etc.

The 5.0 also has good VVT. I think that's why you see so many mustangs running 11's on just a tune. You are able to tune the VVT to the equivalent of a cam swap. On the LS3 it would take a cam swap to achieve the same.

[CamaroCracka]

There are 16 valve SOHC engines like the Ford 427.

VVT is not going to give you unlimited lift. I believe the biggest advantage of VVT is that it's like having two cams in one. You get the low end torque of a smaller cam as well as the higher rpm power of a bigger cam. More area under the curve as they say. This would come into play most on the street or road course. In drag racing, once your out of the hole its upper RPMs.

The DOHC heads generally flow more air. Producing HP is all about pumping air through the engine whether it be two valve, four valve, or supercharged. The problem with heads that flow lots of air is they tend to give up low end torque, thus the desire for VVT in a street engine.

The problem with things like VVT, direct injection and AFM is they all will require purpose built racing parts which are way more expensive. While the SBC was a great engine with a long history, one of it's biggest advantages was it was cheap and easy to modify. Not so with a Coyote or LT1.

The Mustangs are easier to get to the 11's because the Camaro gives up several hundred pounds to them. VVT would help ensure optimal air flow, but I'm not sure how much that helps once your in second gear.

[songsj]

And don't forget how good the new LT1 is going to be for the catch can business!!!

[ChocoTaco369]

The LS7 is more comparable to the 5.0 Coyote in terms of size and weight. The LS3 is a featherweight by comparison. The LS7 walks all over the Coyote.

[MagnumForceGB]

Originally Posted by ChocoTaco369

The LS7 is more comparable to the 5.0 Coyote in terms of size and weight. The LS3 is a featherweight by comparison. The LS7 walks all over the Coyote.

The LS7 costs over twice as much as the Coyote also. The FRPP 5.0L Aluminator XS is the competitor against the LS7, producing over 500 HP all N/A.

[woodside783]

I have a ls3 and my girlfriend has 13 5.0 and to me the ls3 comes alive at around 2500rpm and 5.0 comes alive at 4000rpm. Her car is bone stock took it to the drag strip and ran 12.9
Was impressed had herd that they can go 11s with a few mods I don't dout it at all

[ChocoTaco369]

Originally Posted by MagnumForceGB

The LS7 costs over twice as much as the Coyote also. The FRPP 5.0L Aluminator XS is the competitor against the LS7, producing over 500 HP all N/A.

The LS7 is not mass produced. Make the LS7 in the same quantity as the Coyote. It'll cost similar. The LS7 is expensive because of how limited its production has been.

[87GNX]

Originally Posted by ChocoTaco369

The LS7 is not mass produced. Make the LS7 in the same quantity as the Coyote. It'll cost similar. The LS7 is expensive because of how limited its production has been.

The aluminator is not mass produced as you say either and it's well north of 500 hp...seen one on a dyno not too long ago. They are around 13-14k same as the ls7.