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aeronautical epoxy on deck surfaces

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So I was wanting to learn more about this compound that I have seen some shops applying to both sides of the head gasket or deck surfaces of the block and cylinder head. I have been told its from the aeronautical industry, I can't find really any information on it. From the little information I have been able to get out of people they say you literally have to use mechanical force to seperate the head and block afterwards even with hardware removed. Any information on this would be great. To me it doesn't look like the Three bond 1207B I use regularly for sealing oil pans etc. Also curious how does that not squeeze into oil feeds or even into the combustion chamber on certain engines.

https://www.facebook.com/nelsonracingengines/posts/heres-some-step-by-step-action-of-us-using-the-shit-as-i-like-to-call-it-one-bec/3142844095753222/

NRE, 'nuff said. I wouldn't have him rebuild my lawnmower - he does have some very cool hardware but anyone who does repeated full dyno pulls on a dead cold customer engine I'll give a miss to... You should check his business, and legal problems, out on-line - plenty of people have had problems with his engines and BS.

As for products that physically glue the head to the block, way too many potential problems for 99.9% of people to use, some of which you addressed. If you're building so much cylinder pressure you can't hold it, better to check out what the top fuel guys are using, they're getting more power from one cylinder than NRE get from a whole engine.

Oh, don't forget the importance of the flatness and surface finish of the head and block - some gaskets are very good, but VERY fussy about the surfaces for best seal.

Gord,

Thanks for the reply. I am not looking to do business with NRE just seen there pics of the liquid they use and there is another well known GTR shop in the states that seem to be doing the same thing with their builds. I am more or less just wanting to do some research on it and learn about it, however those that are using it seem to be keeping it close to the chest.

Hi Marcus, I'm not sure exactly what NRE are using but I've also seen some aeronautical products that are used to help seal a head gasket. In reality I wouldn't recommend the addition of any sealants to a quality MLS gasket. If the head is lifting then a 'glue' is not going to save you, and it just makes it that much harder to remove the head and gasket and clean all the parts up.

The only exception is if you're using a copper gasket with an o-ring or sealing ring (which is what NRE are assembling in your link). In this instance the copper gasket does a terrible job of sealing the oil and water between the head and block (most dedicated drag engines are dry anyway), so a sealant is required if you don't want a sprinkler system on your hands. Important to note that the sealant is there to prevent oil and water leaks, not to seal the combustion pressure though. I've used a loctite product on the handful of engines I've built using this head gasket system but I forget the part number sorry.

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