Type of phenolic for gaskets/spacers

[135sohc]

I need to make a new TBI base gasket amongst other things... Cutting it is not a problem ;)

Curious as to what everyone else has used for phenolic material since there are so many variations. Flame retardant ? moisture resistance ? heat rating ?

[Reaper1]

Just don't breathe the dust when you cut it...

[135sohc]

Just don't breathe the dust when you cut it...

Mr. Omax does that for me :)

[johnl]

Good question. It has so many applications and its composition can vary so widely.
Attached is a data sheet for "G11" good to 350* from Alro, maybe call them.
The resin that binds the fiberglass is the weak point while the ablative characteristic of the glass fiber is a strong point
Phenolic is used for space capsule re-entry shielding so there must be higher temp rated

[thedon809]

G10 or fr4.

[jonnymopar]

I'll second the vote for FR-4. It's V0 flame retardant. It's almost universally used in PCB fabs, so I would guess it's nearly moisture-proof.

[johnl]

I want to make a spacer/insulator for the lower half of our 8 valve intake manifolds - at the head. For ease of fabrication, that likely means that it would also serve for the exhaust manifold. And that means that the G10/G11/FR-4 products, although ablative, have max heat in the 300* - 350* range, and so are not high enough. Or, am I overestimating the temps? Maybe a donut kind of heat shield inlayed/inserted into the ID of the spacer at each exhaust port?

[cordes]

Since the exhaust manifolds can glow, I don't think that the temp range you listed is too high.

[GLHNSLHT2]

if you space out the manifolds you'll have to figure out where to move the bolt holes because the intake doesn't hit the head square so you'll have a turn in flow where the spacer is unless you raise the intake. I'm not sure about the exhaust.

[Dr. Johny Dodge]

cast iron glows at 900*F

[thedon809]

Spacing at the head might be more trouble than it's worth. I'd probably just rig up a heatshield and use a plenum spacer (if it's a 2 piece lower). I made a few of these but nobody seems to want any. https://drive.google.com/uc?export=download&id=17rjbafOV6evkZxla7QI5fLZ-6DEECtZ6

[johnl]

Well, I made one and, by a laser thermometer, it works. Not that easy to make.
If you still have one for sale, I'll buy another.

[thedon809]

Your pm box is full johnl

[johnl]

sorry
email is

xbacksideslider1@gmail.com

[Jason89]

Does anyone have any phenolic spacers for the 2-piece?

And how thick of a spacer can I go?

I have an 89 Daytona.

Thanks

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