anyone have the width/height specs on the jcw vs stock heads?

Not sure which head I have on this spare engine with JCW parts

 

this would be good information to know

 

This would be interesting to know.
But if you are just interested in which head is on the engine, your dealer may be able to help, we called then with the serial number off my original head to see if it was truly a JCW part or not.

 

The lead of the team that designed the engine was active on the forums a few months ago, but he hasn't posted in awhile. I'm sure he could tell you. His username is "Unbreakable Lump".

 

he was for chrysler though, the jcw heads were a separate company until late 2005

 

http://s261.photobucket.com/user/Thu...right.jpg.html

 

hmm I did not realize they polished the intake port on the jcw's

 

The polished intake ports you are looking at are not JCW, they are Thumper's. JCW heads were only slightly ported and polished on exhaust side only.

 

So the pic description is wrong? It says jcw

 

That makes sense now, I didn't think I remembered my JCW intake ports being polished, but it had been 9 yrs since I saw the head.

 

I cant imagine that's the difference, that's huge, that looks like a BVH

 

You're right, I hadn't clicked the link until now.
The linked photo is an exhaust port comparison between the TPR2 and TPR1, which is close but not exact to the JCW.
The picture of the intake ports is the polished version of the new head I have, the TPR2r.

 

The only pic of all those images that has a JCW head is the one labeled " JCW vs OEM " the other images are Thumper's work which far exceeds anything on a stock JCW head.

 

head swaps are not allowed in autocross unless you go to like "prepared" classes where there's no money limits, I do not plan on going there

so I measured the head I have in the garage, exhaust ports are 20mm tall anyone know if that's regular S sized?

 

also I found more threads that say the JCW intake throat is polished too

here's another of those threads

http://www.minitorque.com/forum/f29/bang-buck-28063/

 

i was posting my jcw head 2006 for sale and no one seemed to have interest in it. So i decided to install it on my r53. I took it to a respestive machine shop and as well brought the regular r53 head so that they could compare the 2. I was told that the jcw head's intake/exhaust was slightly ported/polished and bigger than the r53's head. They have flow machine and tested them for me, so overall the flow from JCW head is 12% more than the stock. I asked them to "mild" ported and polished the head again as well as porting the intake manifold to match. Oh boy,after the installatio with dominator cam/rmw header and powertone exhaust. My r53 is flying. Will tune the car in September once Jan comes to Phila. Long for short, JCW head is overall flowing better than the regualr one

 

12% more flow.... then jcw also has a 11 or 12% pulley..... coincidence?

 

I really need to find a wrecked JCW in my area to yank the head off of. I want a BVH, but I don't want to spring for a tune.

 

Why not just rework a standard r53 head then? JCW uses the same base casting. Do a clean up of the casting material, have the throats and bowls smoothed and open the ports up to match the gaskets. You can polish out the exhaust side but should always leave the intake side a little rough (aids in fuel atomization since airflow always follows the walls). A flow bench is the best way to test as you go though to optimize the porting, but a little clean up never hurts as long as you aren't heavy handed.

 

scca rules do not allow that, and its grey area if its ported exactly like a JCW head

they allow stock head, and stock jcw head

 

Bummer. I assume they puff it then? The company I used to work for would get away with it for VSCCA as long as they didn't look too hard during tech

 

its honor system not sure how the nationals would handle it, I prefer to just stay within the rules

 

The rules are kinda bullcrap though... JCW and S both in STX. How are you supposed to compete with the exact same car that's lighter and has more power?

 

I know right? I went out and found a jcw so I could compete evenly its really effed up that they did that, its not like mini are competitive against good WRX drivers as is let alone with the regular s handicap and no LSD either