James
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| posted on 2/2/05 at 03:37 PM |
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Pinto Exhaust Gasket- doubleup?
Disappointingly (but perhaps not susprisingly!) my homemade exhaust is blowing somewhat from the flanges. Between the flanges and the head (as opposed
to the weld!).
Presumably this is because the flanges aren't 100% flat against the head. 
I was wondering if anyone had a solution/remedy to this other than cutting them off and starting again?
Would doubling up on the gasket and then really tightening up the bolts help do you think?
Otherwise, does anyone know of anyone selling a single 4 hole flange I could replace my four separates with. I've tried Lolocost and no luck.
What's the recommended thickness for the plate to make the flanges? Mine's currently about 8mm but if I made my own it would be hard work
to cut this to was wondering if thinner plate could be used?
Thanks!
James
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dmottaway
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| posted on 2/2/05 at 04:17 PM |
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how about, using a gasket as a template, cutting a flange from thin material, then welding it to your existing, multiple flanges. Weld it up, machine
it flat, call it good.
dave
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nick205
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| posted on 2/2/05 at 04:18 PM |
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Could you cut them off, then use another cylinder head as a jig and re-weld the pipes? That might get them square to the head better!
Nick
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timf
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| posted on 2/2/05 at 04:19 PM |
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i made a set for pinto man in 6mm stainless so 8mm is plenty the main problem you will have is after you weld the pipes to them they distort
slightly.
i countered this by milling them flat again afterwards. others have had then trued on a lathe after a length of stub pipe is welded to them.
ps if it's not blowing that much try sealing then with high temp silicone sealer.
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britishtrident
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| posted on 2/2/05 at 05:16 PM |
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If the flanges are flat it should be springy enough to mate with the head and once it has got properly hot it should creep should fix things ---
having said that first stop check the studs aren't coil bound
If they aren't try bolting down tight without a gasket then heating each pipe in turn up with an oxy-acetelene flame to bright red.
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907
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| posted on 2/2/05 at 05:43 PM |
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Hi James,
When I built my manifold, I used a piece of
75 x 75 x 10 angle, match drilled as the cylinder head,
(using the gasket as a template) as a jig.
If you were to drill such a jig you could bolt your manifold to it and
heat (dull red) the out of square pipes just above the flange welds.
This would stress relieve them, and when cold, unbolt, and they should be flat.
Hope this helps.
ATB Paul G
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Avoneer
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| posted on 2/2/05 at 06:02 PM |
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Try exhaust paste - may do the job and save all the hassle!
Just a though,
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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Mark Allanson
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| posted on 2/2/05 at 07:07 PM |
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Make sure it is assembly paste, not gungum
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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The Shootist
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 posted on 2/2/05 at 09:04 PM |
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Have the flange surfaced.
Do you have a cabinet shop nearby? Wood shops often have an edge sander (big assed belt sander). As an alternative a cylinder head shop, or even a
machinist may be able to true up the mating surface.
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James
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| posted on 3/2/05 at 10:04 AM |
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Ok, thank you for all the suggestions everyone!
Will keep you updated with progress!
Cheers,
James
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NS Dev
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| posted on 4/2/05 at 02:15 PM |
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I have used doubled gaskets on a pinto with this problem on a professionally made manifold before.
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