By "doesn't even compare" do you mean the Cosworth is far better or the ported stock is far better?

EVOlutionary

 

Well the Cosworth head is CNC machined which is a huge benefit over a hand polished head. However, it has already been shown that the non-CNC heads on the market can still support huge HP. I'd have to see a back-to-back comparison to really believe the Cosworth head is worth that much more money. My 2 cents.

~fred

 

While I am not disputing what you are saying, your statement is a little misleading. The benefit from a CNC ported head is less variation between heads because of the lack of human error. In and of itself the CNC porting isnt inherently better.

 

Many people and many companies would disagree with you because there is no truth in that statement.

 

Cosworth has plenty of experience in Formula 1 and without a doubt they used their expertise on all their products. Do you guys think it would be cool to have a comparison of this head to others out there? The outcome would be awesome to see how far or near the other competitors compared to the Cosworth.

 

It was a glowing review of the Cosworth. As stated by John in the other thread, all the machining is done in Southern Claifornia. WHo has a cnc machine in SoCal that is capable of doing this kind of work. ANyone?

 

So you are saying that there or some people out there that can hand port a cylinder head about as accurately as a computer?

 

the fact is that it might not make that big of a difference, the small imperfections from hand porting aren't that great, this is air flow we're talkin' about so anything in fluid dynamics is terribly complicated and unpredictable, to have exactness is really only a superfluem.

what cosworth HAS is BRILLIANT technology regarding headwork. for their champ cars they have anti diffusing grooves machined into the head. that's CRAZY! and it works too!

so who knows what other tricks they'll put into their stuff... it might not be anything...

 

In order to make the CNC program, it first must be done by hand, or some other method. So yes. Non-CNC ports can in fact be better. CNC produces great repeatability, but it is ultimately an approximation (albeit a very good one) of a one-off port job. If i'm buying a head, I would buy a CNC'd head. But if I were an engine guru, I would buy that CNC'd head and possibly also finish it off by hand.

As asked before, are there any hard data points on any heads in the market? Flows @ lift, chamber and port volumes, etc to make a comparison? It has always seemed to me that the majority of evo r&d has been on the turbo side and throwing in stronger bottem end parts. Unfortunately overall, it seems there is not a lot of development on complimentary head and cam upgrades.

 

Describe these? Photos? Info?

 

Anyone who knows domestics knows the name Edelbrock. Their heads are CNC machined. Both the main headquarters and thier aluminum foundry are located in SoCal. I would not be surprised if Cosworth was having the heads made there.

EVOlutionary

 

For $3,800 I could think of alot of better mods. Unless this thing somehow makes a huge difference over a hand ported head whats the point? Shepherd and Rau dont use one and both make over 1,000 to the ground... so when is it you really should buy this thing as opposed to just sending your head off to a reputable machinist and have it done up?

 

^agreed...
i would have to see a comparison to justify spending the money

 

Last time I checked, shepard doesn't run an Evo motor, but hey, what do I know?

 

While you guys argue the specs, it may be worth noting that Cosworth is supplying V-8s to two Formula 1 teams this year. And while I realize this does not automatically make their head great, it does speak for their quality.