Whats the thread size for the VW type 4 plenum?

[esturdivant]

I've got my temporary PVC manifold all assembled and I don't want to take it apart just to get the thread pitch size. For the carb studs... Yes, I realize i am a little bit lazy... Thanks in advance.

 

[esturdivant]

Assembled, and mounted on the bike that is

 

[esturdivant]

And a google search has come up nil...

 

[esturdivant]

ok - FWIW - just stumbled on this and I'm going to get a couple 5/16 studs tomorrow and see if I can get one to fit in there.

viewtopic.php?f=107&t=6705

 

[Steve83]

The VW plenum is metric, I would think... 5/16 is almost exactly 8 mm.

 

[Dusterdude]

8x1.25 iirc


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[dan filipi]

Steve83 » Sun Apr 06, 2014 12:49 am[/url]":2e54a0fk]
The VW plenum is metric, I would think... 5/16 is almost exactly 8 mm.

If I remember correctly the plenum threads are 5/16.
The stud is 5/16 on one end, 8 mm on the other end.

 

[Steve83]

Interesting - a hybrid!

 

[dan filipi]

Steve83 » Sun Apr 06, 2014 10:19 am[/url]":379uajur]
Interesting - a hybrid!

It is an oddball.
I had to make a special trip for metric nuts.

 

[who444444]

on mine I used 5/16 treaded rod cut to length and then 5/16 nuts.
But someone else did post that their manifold was metric holes?
dave

 

[Steve83]

Well, 5/16" = 0.3125", and that is 7.9375 millimetres, so if the thread pitch is similar, 5/16" or 8mm should work. Unless you're going to worry about 0.0625mm... Can you tell I'm bored???

 

[Ansimp]

VW and GW are metric it is just a question of whether the aftermarket supplier of the type4 manifold used a metric or imperial tap.
As Steve said 5/16 and 8mm are awfully close.. :good: