Has anyone performed back to back testing on the Cosworth head and any other reputable shops head or even stock head? I'm very interested in knowing how much HP the head actually makes on a car that could really benefit from a ported head.

Yes, I know the Cosworth name but to be honest I'm skeptical that it makes any more power than any other available ported head.

 

+1 on this. I know AMS has used a couple of their heads, but I would like to see how this compares to stock vs other ported heads as well.

How much did velocity increase or decrease and how did it affected spool time vs increased top end....

Sounds like a new Dyno test is needed from Buschur Racing.....

 

Pretty much what I figured.

People are shelling out money on a big name instead of on something that actually works better. I guess telling people you own a Cosworth head scores you more cool points with the ricers.

 

personally i don't think that the cossie head is such a big different price.

To build a race head to any of the respected shops you need 2K. If you add the cost of a new head to this price (buschur charges $1450 for a new core) the cossie head is not that expensive, plus you have an extra head, which if you sell you can cover some of the extra cost.

I would love to see a fully built cosworth engine (head, pistons, rods, cams) with a big turbo. I am sure that the results would be awsome...

This is a personal opinion of course...

 

The shop that does all of my head porting charges me about $900 for extreme portwork, resurfacing, radius seats, etc. They are very detailed, give me the before and after flow numbers and also shows me the proof (if asked) on the flow bench. After I add 1mm over nitried intake and sodium filled, hollow stem valves, titanium retainers, dual valve springs, bronze guides, to the mix I end up at about $1500 for everything and have a better head than anything that I've seen advertised near that price. So to me asking $3k for a ported head means that it should be 2x's as good as what I already get, which I am highly skeptical of.

Yes, many reputable shops charge a lot for their ported heads and if your comparing the price of the Cosworth to theirs you could convince yourself that it is a ok deal, but to me looking at what I've seen done to 4g63 heads to make them flow I can't see there being that much work porting, etc to justify the price in my mind unless their welding in a cloverleaf design on the bowls.

This is why, unless someone has something to prove different, I am making the assumption that this is more a bragging rights, "look how much money I paid" mod than a superior to anything thing else mod.

 

True that !!!

 

well i havent been able to fully test the setup yet because i am still breaking in the motor...but i do know that i was peaking 13-1400 hertz from 0 -3k rpm...i think the stock evo head is making that at like 6k...so you are definitely going to flow more air and raise your VE w/ any ported head...the cosworth isnt a bad deal because it has the high rev valvetrain which is capable of 10.5k rpm...which the evo will never see...

 

Sounds like a square deal to me, and it's more in line with reasonable industry pricing.



It isn't. IMO, Cosworth recognized a market abundant with persons eager to lose money as quickly as they earn it and decided to toss in a few items to capture their share of it.

 

FWIW, any upgraded/ported head is equipped with a 'high rev valvetrain'.

 

What the Cosworth head offers is consitancy, since the head is CNC'd each bowl will have the same swirl marks, same radius and same volume, same goes with the ports you will have the same flow across all 4 runner.

 

That's great and all but the name of the game is flow and velocity. If a machine shop can show you port for port increased flow and velocity at almost exactly the same rate across each, how much more is the CNC process worth? Not an extra $1500 to me.

 

this topic has been discussed extensively. here is a link for a very detailed info why Cosworth head is worth the money if you are serious about racing.

https://www.evolutionm.net/forums/sh...=cosworth+head

 

These heads were never ment for the everage enthusiast, they are ment for race applications. In an all out race application you can't beat a cnc'd head.

BJ's heads are the best hand ported head on the market (assuming he ever gets to them, but thats a diffrent story) as long as he's been doing it they still don't compare to the cosworth head, and this comes after a long conversation mith Adam, Scott Gray, and Muller.

 

Very well, no one can doubt that CNC porting gives as perfect consistency as can be had.

However, when I see clear cut evidence that demonstrates this head to accomplish something can cannot/hasn't been achieved via a ported head, I'll consider that the proof of the pudding that justifies the hefty pricetag. Unless/until that happens, I choose not to hold my breath.

So far, I see examples of performance far in excess of anything that I want or need accomplished with much less invested, so that makes it a non-issue for me.

 

I think your missing the point. Talking about theory and seeing proof are two different things. I could careless what or why Cosworth did what they did to their heads and why they think it's better. The question was who has done back to back testing between a pro hand ported head and the Cosworth head. So far all that has been offered doesn't prove or justify the price tag over what can be had at almost 1/2 the price. Not only that, the example I gave above uses as good if not better material than what they supply.

On a side note, flow numbers don't mean diddly unless done on the same head, by the same person, under the same conditions. Those advertised numbers Cosworth included with the head might as well be toilet paper. Hell, they didn't even bother to tell you if the test was performed at 28" or not which is Flow rate 101.