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Id on Ul intake nipples

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Flathead_freak

Posts: 32

Joined: Thu Jan 31, 2008 10:54 am

Post Wed Sep 09, 2009 4:02 am

Id on Ul intake nipples

What is the id on Ul intake nipples?
I have serched this forum and the net but cant find any information on it.
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GuS

Posts: 312

Joined: Sat Apr 28, 2001 12:01 am

Location: Bergen, Norway

Post Wed Sep 09, 2009 9:13 am

Re: Id on Ul intake nipples

33,1mm
1,303 inch
Dont think the one I have are OEM, but I don't remember.
GuS
<<

Flathead_freak

Posts: 32

Joined: Thu Jan 31, 2008 10:54 am

Post Thu Sep 10, 2009 3:55 am

Re: Id on Ul intake nipples

not bigger than that, thought that they where alot bigger than wl.
Do you know what size the ul manifold has?
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GuS

Posts: 312

Joined: Sat Apr 28, 2001 12:01 am

Location: Bergen, Norway

Post Thu Sep 10, 2009 11:52 am

Re: Id on Ul intake nipples

Sorry cant help you have no U Y-intake.
GuS
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don

Posts: 552

Joined: Fri Oct 01, 1999 12:01 am

Location: Spokane WA USA

Post Thu Sep 10, 2009 5:31 pm

Re: Id on Ul intake nipples

I got 1.337" I.D. on both short and long manifolds, a couple that have been polished, 1.375" all the way to 1.430".
My N.O.S. nipples tagged 1112-37 & 27039=37 are 1.309" I.D.
I would taper the I.D. of the nipples to match the I.D. of the manifold, For smooth transition,
A Maximum of .250" into nipple at manifold nut thread I.D..
The manifold nut thread is .335" deep/long with a relief of 1.430" O.D.,
Then you have the threads that enter the cylinder.
don
<<

Flathead_freak

Posts: 32

Joined: Thu Jan 31, 2008 10:54 am

Post Sun Sep 13, 2009 5:58 am

Re: Id on Ul intake nipples

okey, thanks for the info
Decided to take up the wl nipples to 32mm instead of the trouble with machining.
But as im going to use stroker plates under the cylinders i have to make a new intake manifold.
Does anybody know the outside diameter of the original intake, want to make one that i can use the original intake nuts with?
<<

GuS

Posts: 312

Joined: Sat Apr 28, 2001 12:01 am

Location: Bergen, Norway

Post Thu Sep 17, 2009 2:11 pm

Re: Id on Ul intake nipples

Found my notes for the last WL Y-intake I opened up:
Id: 33.0mm/1.299 inch
Od: 36.1mm/1.421inch, this is the spigot cut for the PEEK seals
Throat 35.2mm/1.386inch. Have installed a 36 Mikuni VM on this bike.
Did braze to add to the thickness just for safety, although I never cut into it from the inside.
GuS
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