Intake to short

[elmo]

Pulled the manifold off of a 52 panhead with o ring conversion to replace the o rings.the manifold’s is 2 7/8 long and is about 1/8 to short.any else come across this problem and what kind of fix did you come up with fix or a longer manifold thanks Elmo

[RichO]

Not an expert like Cotton, Rubone, and others but that works out to 1/16th per side and with expansion and contraction due to heating up and cooling down and the rubbers filling the void with some flex? Would an interference fit be to tight?

[T. Cotten]

Does it leak, Elmo?

....Cotten

PS: Cotton may well be an expert, but I am still a student.

[elmo]

Trying to bring a bike back to life that been sitting for 30 years thought this was a good place to start . The bike was always hard to start back in the day so they were probably bad back then have to check the o ring conversion to see if that leaks . Just thought the manifold looked short the S and S is 3 inches the other replacements are the same width as mine thanks will keep you posted. I may have put the cart before the horse

[T. Cotten]

Botched O-ring conversions, Elmo,..

Probably trashed more Pan heads than even 'hard seats', so please test the inserts before other worries.

...Cotten

[Rubone]

Trying to bring a bike back to life that been sitting for 30 years thought this was a good place to start . The bike was always hard to start back in the day so they were probably bad back then have to check the o ring conversion to see if that leaks . Just thought the manifold looked short the S and S is 3 inches the other replacements are the same width as mine thanks will keep you posted. I may have put the cart before the horse

All factory O-ring manifolds are the same length from '55-'65 so you won't find a longer one unless you to the aftermarket for a stroker version.

[dukekleman]

Elmo,
During the conversion process you will get variations in the nipple install height. However a quality correct Viton O -ring is more than capable of sealing the approximate gap of 0.0625" per side you mentioned.
As Cotton asked, have you resealed your existing components and have an actual leak or just seeing the current gap and asking a pro active question?

[knucklehead 61]

i always wrap one turn of electrical tape over o rings before installing the clamps. they never leak this way for 38 years.

[T. Cotten]

i always wrap one turn of electrical tape over o rings before installing the clamps. they never leak this way for 38 years.

Curmudgeons laughing2.jpg

....Cotten

[PanheadFred1]

i always wrap one turn of electrical tape over o rings before installing the clamps. they never leak this way for 38 years.

I've been doing the same thing. This also helps hold the manifold in place while you put the clamps on.

[T. Cotten]

I've been doing the same thing. This also helps hold the manifold in place while you put the clamps on.

Either of you guys see what gas does to electrical tape?

Stooges facepalm.jpg

....Cotten

[RichO]

Yes Cotton but he's saying over the o-rings and under the clamps. No gas should be getting through to the tape passed the o-rings if all is correct right? Just sayin'.

[T. Cotten]

Yes Cotton but he's saying over the o-rings and under the clamps. No gas should be getting through to the tape passed the o-rings if all is correct right? Just sayin'.

If nothing gets past the O-rings, Rich,...

Then what's the point of gumming it up with tape that's going to melt and allow the clamps to slide?

So it works when the O-rings fail?

ORING.jpg

'Goes without sayin',

...Cotten
PS: Viton won't do that of course, but they don't need a band-aid either.

[PanheadFred1]

Either of you guys see what gas does to electrical tape?

Stooges facepalm.jpg

....Cotten

Never had an issue Cotten. Been doing it that way for ever. I'll go sit down now.

[T. Cotten]

Never had an issue Cotten. Been doing it that way for ever. I'll go sit down now.

Bless your heart, Fred!

(Doing it for a feeble living for decades, I lost count of how many messes were brought to me to clean up. Thankfully, gas made it all wipe right off.)

....Cotten