Port Epoxy

[spdingtkts]

What is the best stuff to use?

Is there anything out there that will survive the heat in the exhaust port?

Also, where can you get the stuff that you are recommending?

 

[NeilRoshier]

on the intake ports I have used and heard very good things about JB weld when used correctly. Exhaust ports...I would be amazed if anything would work/last for very long.

 

[patprimmer]

Not directly in the port, but I have successfully used a Hydro Epoxy Putty to block exhaust heat crossovers on inlet manifolds.

This is a two pack epoxy putty, used by plumbers to repair or seal, cast iron pipes. You mix the 2 parts underwater, or at least fully wet your hands first, then it will wash off.

It sticks to metals like the proverbial sh*t to a blanket, and is very tough and as good to temperature as you can afford to buy. Also, being avaliable from builders supply houses, it is relativly cheap.

In Australia, it is called "Charmac Pipe Jointing Compound"

Regards
pat

 

[Flowczar]

There was a company called Cotronics, in New York I think, who make very high heat epoxies. I have used them for various ports, including exhaust, and would caution anyone considering this to be vary aware of their own responsibility. I don't believe epoxy to be a permanent fix, but for test verification and development work it does save some expense.

 

[PFM]

spdingtkts

I too have used JB Weld in intake ports, even in "air cooled" heads with good results, contact them for details. As for the exhaust side never even thourgt to try, the heat is too high.

PFM

 

[ProgressiveRacing]

A&B is a 2-part epoxy that works well in intake tracts. It's a Moroso product so Summit, etc., should have it.

No "epoxy" will survive in an exhaust port. Welding would be your best option there. A very specific process though.

 

[spdingtkts]

I never thought that there was an epoxy that would work in the exhaust, but I have been told that there is an epoxy that does work.

I have always used welding in the exhaust port. The problem is that the welder cannot get into the port as far as I need.

 

[andyv8]

For info, Devcon to a range of epoxies with different fillers to match the thermal expansion of the epoxy to the parent metal.
I've used the aluminium filled version on the inlet ports of aluminium cylinder heads and they've quite happily lasted for 500 hrs dyno running. No chance that you'll find anything that will live at 900°C exhaust port temps though.

http://www.devcon.com

Andy

 

[type26owner]

http://www.aremco.com

Call these folks. You might get lucky with a ceramic/putty.
Keith

 

[ShaunT]

Stick to welding.

Shaun TiedeULTRADYNE Arl,TX(stiede@ev1.net)