your opinion?????

[vw911]

1700cc came with bigger valves stock and came with oval port exhaust, and Late 2L bus heads had smaller valves but are "D" ported exhaust. I heard D-port flow better. 914 angle pluged heads are hard to find at a good price. Thinking of putting in 44x36 valves in some heads for T4 motor. Any pros and cons?

Plans 75mm x 94mm combo
Web-cam
got 40 dells and 40 webers
goning to use a PTP exhaust from Oliver Knuf

[Patrick]

I haven't heard of the exhaust you mentioned - what is it?

[kokanee]

are you speaking of 80-83 bus heads?

the main difference is the shape of the exhaust port where the exhaust manifold meets the head, it is more rectangular than the rounded exhaust ports that we are used to.

the assumption:
I don't think that VW would make an engine less efficient than the ones that came before it, so does this mean that the square ports have better flow characteristics? not sure, but the odds are in favor of it.

the problem:
If you have already invested in an exhaust setup, you will have to get yours modified, or a new one.

...that's my opinion, you asked for it.

------------------
Kokanee
'64 Manx 2.0L

[This message has been edited by kokanee (edited 03-01-2000).]

[vw911]

I have not bought an exhaust yet. I really want to use D-ports, why: no gasket! would think they were a better head being the last of the aircooled days. I plan on buying an exhuast from German company. If I could find some angle plug 914 2.0L heads I would be happy. Somebody some guy that works at Pelican had a pair of castings???

[crazylarry]

If the head you are talking about are if fact 80-83 heads from a vanagon. They are more commonly called sqaure port heads. If
thoughs are the heads you are talking about I would strongly recommend NOT using them. Noone that I know of makes exhaust that bolt up to sguare port heads. I use a vanagon T-4 motor in a bug when I was in germany I had to cut the breath vent off the case to make it like a bus T-4 motor as for exhaust I had to use vanagon heater boxes and header. Header boxes Had to be all hacked up to shorten them so that the exhaust would fit under the car. I have never heard anybody call these heads "d" port heads thow. I've always used oval and square the discribe heads. If you want and experts opion call Markstephen Performance. The specialize in T-4 they are great people their and they know it all

Larry

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[vw911]

Larry guys my way call the D-port heads( same as square port 80-83). I know not many if any aftermarket exhaust were made for these heads. I heard the square ports flow better and have more material to work with. The flow is my main concern.

[Tom Notch]

After a good, reputable head shop (that understands a T4 head) gets done with a T4 head, there is minimal difference in the flow between any of the head styles. I used 914s cuz I got a great deal on the cores and for the improved sparkplug angle. I knew I would be having to modify or custom build exhaust for my car (a Notch with a pancake T4 that retains the useable trunk). Go up to a 44 (to 48?) intake valve and use a 38 exhaust (several people I have talked to have said the T4 exh. port won't gain any flow with bigger than 38 or 40 exh. valve, unless lots of welding and work is done to the ports). The way I got it was any bigger than 44x38 took lots more work with little gain. So above that size, the money put into them doesn't get as much improvement. The cost vs. return starts going down. It doesn't cost much difference in the parts used, valve seats and valves, but the flow improvements are more expensive for littler gains. So depending on your useage and where you want the motor to make power at (a result of cam and rocker ratio, rod length, induction, etc.) and you have to be honest with yourself about your real world driving conditions. Are you building for a street car that may see a race track once or twice a year, or an engine which you will be running on a track only? The latter would not be fun on the street IMHO. This is just the miscellaneous info I got when I was looking at heads for my application, from FAT, European, a bit of Perfomance Tech, Clyde Berg, etc. This is not the bible on heads, and I will continue to look, listen, and ask.

[Patrick]

What type of valves did you use for your 44x38 914 heads? Most people I have spoken to say to stay away from stainless (with the exception of MSHP - thats all they use). 914 2.0 heads used sodium filled exhaust valves but they go for $55-$60 each.

[vw911]

Patrick one question , one answer.
Q: What size are the 914 sodium filled valves and intake? My freind has a set on his bus stock valves running 103mm p/c. His runs GREAT.

A: PTP exhaust from your previous question to my posting. Power Tuning Parts exhuast, Twisted stainless exhuast same as seen on bugs in Euro mags using the dual mufflers inline exhuast. See Bonker's page for a pix

[vw@micron.net]

The A. Knuf Power Tuning Parts exhuast is is made by Ahendorp BAS. http://www.ahnendorp.com/

[Patrick]

Stock 2.0 914 heads are 42x36.

[vw911]

Would putting 44mm intake valve mess-up the balance of the head using the same 36mm sodium exhaust with it? My friend runs these heads stock with 103mm x 71mm and a Scat cam and 45Dells in a Bay-window that has monster 31 tires on the rear 205/60/14's up front doing 100 mph+

[Patrick]

Whether or not it would mess up the balance of the head, I don't know - but I kinda' doubt it.

Which fan shroud is your friend using to cool those 103's? Is he using any additional oil coolers?

[vw911]

He is using the stock bus fan with the stock cooler with an external cooler catching some extra wind. 914 heads with Pauter ratio rackers. His name is Dave. He runs "Bug Haven" Fort Bragg,NC 919-436-1954 His bus is big& heavy also: her name is MOBY