here at WPVW we are experimenting and developing a modified type-4 cylinder head that has type-1 style exhaust ports so that we can get a larger
volume of exhaust gas out of the engine without having to squash the exhaust tube between the pushrod tubes . we have seen the pauter and the remelle
heads that cost US$3500 , but not very often you have a spare AUD$5500 just lying around that you can spend on heads . Our heads should be a much
cheaper alternative and we will personally test them when they are completed . will keep you posted on our progress .
first pic shows the origional exhaust port welded-upnn[ Edited on 13-8-2005 by hypo-vw ]
more pics
more picsnn[ Edited on 13-8-2005 by hypo-vw ]
more pics
more pics
Are you looking at casting a whole new head, or individually modifying standard heads?
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Would be great to have Aussie T4 heads......................anxiously awaiting:thumb
my uncle told me about that bike.... he runs in the vintage speedway circles in Adelaide, said it was an incredible machine. Sounds like the bloke has his head screwed on right !!!
Hey Hypo
My father Richard Holzl many years ago went into doing the same thing and made samples to have them cast but pulled out after it was going to cost way
too much to finish it off. I think we still have a wooden head with the T1 style exhaust port somewhere.
alex
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I've got another idea to get rid of the pushrod/port clearance issue.. DOUBLE OVERHEAD CAMS!!
But seriously... good effort :thumb
or better still yet, two stroke! Hotrod matt had a link to one way back.
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This is fun to see. Same problems, same ideas and similar solutions.
In Sweden I did own a TIV engine with seriously modified exhausts to T1 style. The heads were inspired by the rallycrossers who did this type of
exhaust modification and also on some they put on watermantles around the cooling fins.
My engine had both.
Second set of heads were traded to me and had MIG welded T1style exhausts. This head was never "stable" with seats moving around. I guess it was
simply done in a too rough way. No pre heating and no aftercooling.
If done professionally, it is definatly possible.
A friend of mine in Sweden was so pissed off with quality and design of the T1 heads available....and the prices when in Sweden, that he has cast his
own heads. They look really nice and flow like hell right out of the box even before porting. Still in prototype stage but it is just another example
of that it can be done if you are motivated.
Good work to keep the aftermarket vw industry moving ahead and improving. I for one would love some better flowing heads for my type IV so hopefully one day they may be available.
Have seen this done.
Have it cast. I would also be interested in a good flowing cheaper alternative.
http://www.jpmotorsport.se/
Not type 4 heads but apperantly Johannes is now official with his new castings that Ireferred to.
Check it out and his totally stock looking sleeper running 12 s and Keihin carbs. Wheelstander on a good track. this guy knows how to build VW's.
http://www.jpmotorsport.se/
Looks like that guy has done all the hard work already, The machining and time costs would be outrages
They look quite good
nice eye candy there guys, I like! I like alot :bounce
I'm curious to know if anyone has any alternate suggestions for the down facing exhaust ports for people who want to stay with the pancake cooling?
The only things I can think of are tappered pushrod tubes such as what some Harleys run 
then just inserting some sort of bushing where the pushrod tube sits in
the heads. Does anyone think this would create running problems in anyway?
The only other thing I can think of involves casting a whole new head and having the exhaust port sit flush with the base of the head a'la 911 heads,
however the pushrod housing on the ends would need modifying. I'd photo-opped a type IV head pic (pain in the arse to find an underside shot in the
first place) so show what I'm thinking, but again you would have to drastically decrease the size of the pushrod tubes.nn[ Edited on 19-8-2005 by Cam]nn[ Edited on 19-8-2005 by Cam ]
I would have thought that head strength is the biggest improvement required.
I don't think the exhaust port is that much of an issue. No, they don't flow as much as a type one port, but that can be worked around with camshaft
if required.
Adams streeter shows that the N/A potential is there, and any thing turbocharged always goes fast with correct tuning.
I think the photo that Dave posted is of a type one, cause the T1 rocker cover wont fit the T4 valve spacing considering the cylinders are further
appart also.
I think the scat splitport heads can be ordered to fit T4s.
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