The 4" Bore Thread

[ugly duckling]

so thats cool i kinda wish you could have showed the other side of the head were the spark plug goes IF THERE WAS ONE THERE and also showing the susposed off the shelf lips in the ports. not to detailed like mine but hey yea cant have everything with farm products right. thanks for the not to detaield entertaiment thats cool not to shabby if its actualy athentic.thanks again. .UD . 

[Big Power]

so thats cool i kinda wish you could have showed the other side of the head were the spark plug goes IF THERE WAS ONE THERE and also showing the susposed off the shelf lips in the ports. not to detailed like mine but hey yea cant have everything with farm products right. thanks for the not to detaield entertaiment thats cool not to shabby if its actualy athentic.thanks again. .UD . 

I knew you would have a nice positive response. Would you like another video with me installing the manifold so you can see the port and then flowing it? If I were you, I would let it go Jeff. Here is a pic of the head still on the flow bench. I pulled the manifold off so you can see the cnc lines.

[58vw]

thanks for sharing

[71CALRIPPER]

Sorry for the silly post if indeed it is one, do we have a battle of two different heads here...fair enough they both make massive numbers but one is a street/strip head and the other purely a strip head so how can can be compared?

Surely to be fair it they would have to have the same purpose? Other wise i will compare my socks to my gloves 

Rob

[Sander/DVK]

Awesome heads Pat!!  Really great numbers.

[BeetleBug]

so thats cool i kinda wish you could have showed the other side of the head were the spark plug goes IF THERE WAS ONE THERE and also showing the susposed off the shelf lips in the ports. not to detailed like mine but hey yea cant have everything with farm products right. thanks for the not to detaield entertaiment thats cool not to shabby if its actualy athentic.thanks again. .UD . 

I knew you would have a nice positive response. Would you like another video with me installing the manifold so you can see the port and then flowing it? If I were you, I would let it go Jeff. Here is a pic of the head still on the flow bench. I pulled the manifold off so you can see the cnc lines.

Thanks for posting Pat, just out of curiosity; it would be interesting to see what difference it would make if you build a "spoiler" in front and under valve guides. Instead of building turbulence and have a negative effect on the flow I believe the "spoilers" can improve the flow # and also improve the support of the seat. Enclosed is a picture of Comp Eliminator intakes where you can see this. It flows 236 cfm in 25" water (with cylinder and manifold) which is about how much it is possible to make a Comp Eliminator head flow, but thats a different discussion.

[TexasTom]

so thats cool i kinda wish you could have showed the other side of the head were the spark plug goes IF THERE WAS ONE THERE and also showing the susposed off the shelf lips in the ports. not to detailed like mine but hey yea cant have everything with farm products right. thanks for the not to detaield entertaiment thats cool not to shabby if its actualy athentic.thanks again. .UD . 

I knew you would have a nice positive response. Would you like another video with me installing the manifold so you can see the port and then flowing it? If I were you, I would let it go Jeff. Here is a pic of the head still on the flow bench. I pulled the manifold off so you can see the cnc lines.

Is there any other port designs available for these heads, or is this the only design you made for them, so far?
Did you design this port so that even more work can be done for 'ultimate' flow?
What is the minimum size engine (& rpm) you would recommend they be used with ... ultimate combo?

[58vw]

looks like 350hp easy

[TexasTom]

Any recent developments into the future of 4 inch bore engines for the near future?
... I'm talking about something I can use and DRIVE ...
Is this a fad or will it be here to stay?

That's the reason for the question ... the more that are out on the street, blowing the doors off whatever doesn't matter, the longer they will last and become the new standard for VW air-cooloed performance!

I remember back when the iconic "How to HotRod a VW engine" cam e out ... seeing the Iguana's engine with those 'ridiculous' 94mm pistons and cylinders ... that'll never happen!

[Zach Gomulka]

The Iguana had 95's!!

But I agree, I hope 4" motors evolve into the new standard. IMO, we just need some new heads on the market that have some real, street worthy cooling fins. Type 4 intake flange and angled exhaust ports wouldn't hurt, either

[Fiatdude]

like these??
[ Attachment: You are not allowed to view attachments ]

[TexasTom]

I think I see some parts on the horizon that may fill all those bills ...

[Jon]

IMO, we just need some new heads on the market that have some real, street worthy cooling fins. Type 4 intake flange and angled exhaust ports wouldn't hurt, either

So what you want is a MS230 4" with angled exhausts... 

[Zach Gomulka]

IMO, we just need some new heads on the market that have some real, street worthy cooling fins. Type 4 intake flange and angled exhaust ports wouldn't hurt, either

So what you want is a MS230 4" with angled exhausts... 

Maybe. Pictures?

[Udo]

The Iguana had 95's!!

But I agree, I hope 4" motors evolve into the new standard. IMO, we just need some new heads on the market that have some real, street worthy cooling fins. Type 4 intake flange and angled exhaust ports wouldn't hurt, either

You can built a Type 4 engine , so you can run 103 on the street with original heads and good cooling 

Udo

[Zach Gomulka]

The Iguana had 95's!!

But I agree, I hope 4" motors evolve into the new standard. IMO, we just need some new heads on the market that have some real, street worthy cooling fins. Type 4 intake flange and angled exhaust ports wouldn't hurt, either

You can built a Type 4 engine , so you can run 103 on the street with original heads and good cooling 

Udo

Blech!!

[Neil Davies]

The Iguana had 95's!!

But I agree, I hope 4" motors evolve into the new standard. IMO, we just need some new heads on the market that have some real, street worthy cooling fins. Type 4 intake flange and angled exhaust ports wouldn't hurt, either

You can built a Type 4 engine , so you can run 103 on the street with original heads and good cooling 

Udo

Blech!!

That raises a good question. Type 4 engines are supposed to be heavy, but how much would an Alu-cased, 4" bore T1 motor actually weigh?

[Frallan]

Or watercooled TIV with 103/105 bore?
Sorry guys, I am just playing a little bit. It is not a serious suggestion but more pickled input on some nice heads that I got in a car/engine I bought in 1985.

[Jon]

So what you want is a MS230 4" with angled exhausts... 

Maybe. Pictures?

The angled ports does not exist... but you could do it like the good old boys with the exhaust sticking into the head at an angle...  

[Udo]

The Iguana had 95's!!

But I agree, I hope 4" motors evolve into the new standard. IMO, we just need some new heads on the market that have some real, street worthy cooling fins. Type 4 intake flange and angled exhaust ports wouldn't hurt, either

You can built a Type 4 engine , so you can run 103 on the street with original heads and good cooling 

Udo

Blech!!

That raises a good question. Type 4 engines are supposed to be heavy, but how much would an Alu-cased, 4" bore T1 motor actually weigh?

Type 4 case 15 kg . Alucase with raised roof and deck 16 kg  Waterboxer case with water jakets cut off 16 kg . But the strongest is the waterboxer in my opinion

Udo

[ugly duckling]

another one down the BURNT RUBBER HIWAY.  on to the next two. UD .

[ugly duckling]

..

[karl h]

do you always weld up the passages for the stock cooler?
because the 4"bore cuts into the galley?
i would like to keep the stock cooler (additional to one mounted into the full flow system)

[richie]

do you always weld up the passages for the stock cooler?
because the 4"bore cuts into the galley?
i would like to keep the stock cooler (additional to one mounted into the full flow system)

yes,it has a rod inserted into the oil galley as you cut into it so you cant use the stock cooler at all

cheers richie,uk

[181]

great pics.. 

[Big Power]

That's very nice looking work Jeff.

[Unkl Ian]

Waterboxer case with water jakets cut off 16 kg . But the strongest is the waterboxer in my opinion

Udo

Udo: Do you regularly build big bore oxyboxers ?

[Udo]

Not regulary . It is very expensive . But the case is strong and has correct machine work from VW factory supplier .
I have two 82x96 engine on the circuit track with 230 hp. It works for a long time now , just like Type 4 engines with bigger cc. Another is an 82x97 engine on the strip with 250 hp . You do not need any freshing up like Type1 case engines . Next is a turbo engine...

Udo

[ugly duckling]

thanks for the complment there pat. i have to thank jack for doing the center main thrust for me deffenetly a  set up. UD .

[K-Roc]

That's very nice looking work Jeff.

Funny, I was just scrolling down the row of pictures and thinking exactly the same thing!

Very nice!