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Technical => Matt Shaff's Engine Shop => Topic started by: Big Rhino on March 23, 2014, 03:51:53 PM

Title: Methanol / Nitro in epoxied heads?
Post by: Big Rhino on March 23, 2014, 03:51:53 PM

I am building a BBC and the heads are older EPD Racing and are extensively ported with epoxy.  I plan to run my stack injection on methanol and occasionally up to 30% Nitro.  Is this going to be a problem with the epoxy?

Title: Re: Methanol / Nitro in epoxied heads?
Post by: masracingtd1167 on March 25, 2014, 11:32:22 AM

I can't tell you about nitro but I run my car and alcohol . I use epoxy on my small block heads and have had no issues . The best epoxy to use is called splash zone . It is a marine epoxy and it works very well . I have also heard that some engine builders will cover the epoxy with a clear urathane paint . I hope this helps . Bill

Title: Re: Methanol / Nitro in epoxied heads?
Post by: Big Rhino on March 27, 2014, 03:07:31 AM

Thanks for the info.  I heard rumors of epoxied heads running methanol and the epoxy degrading/melting/peeling out..etc.  I was just wondering if there is anything to worry about.  Don't know what type of epoxy was used on mine, I bought the heads used.

Title: Re: Methanol / Nitro in epoxied heads?
Post by: andrewb on March 28, 2014, 09:04:30 AM

We run 90% nitro with epoxy filled heads/block and have no problems. Lately, at the rate my wife goes through engines, we haven't had a block last more than two years, although we have another engine that's been running for over 10 years without any issues.

Andrew

Title: Re: Methanol / Nitro in epoxied heads?
Post by: Big Rhino on March 28, 2014, 10:59:56 PM

Excellent, I feel much better now!   ;)

Title: Re: Methanol / Nitro in epoxied heads?
Post by: slingshot383 on April 15, 2014, 09:17:12 AM

After 5 seasons, the epoxy is pretty well toast, and will need to be redone.  Not so much the fuel as the heat/ cold cycles causing the issue.

Title: Re: Methanol / Nitro in epoxied heads?
Post by: Big Rhino on April 18, 2014, 11:30:43 AM

Yep, now that I think about it, it actually makes sense.  Rats, I hope these heads make it a season or two.  I will have to inspect them more frequently I guess.  I believe I will just stay with the methanol, no nitro.
Thanks guys!