BC

Well, I am concerned now, not about the structural - I think the hole will keep it in there,and there is no raised surface to catch air or anything else.

Its ethanol. Ethanol seems to dissolve the JB weld. That is a problem, as that port will see direct streams of e85. Crap.

Anything resin based will disolve in ethanol, so I don't think any of those things suggested will work.

bd0nalds0n

At least now you know an easy way to get it out before the head's installed.

BC

I guess that would be a good test? I could get a couple gallons of ethanol from El Cajon and dip the head in.

My other idea was to stick with the idea but paint some zinc-it over the area to protect it from the fuel.

Imo000

The JB will expand at a different rate than the surrounding metal. This will most certainly loosen the JB “plug” and eventually it WILL either break up or come out in one big chunk. Do you really want to destroy your expensive engine with a Mickey Mouse patch like this? I’m a huge fan of “fix it so it’s just good enough” but this is even beyond me.

Considering you are you are building something that you never did before, do you really want to introduce an unknown element like this? Don’t worry, you’ll have enough issues to deal when the engine fires up, you don’t need one more, do you?

BC

The testing so far, in which I am using E85 from a jug, are helping me learn alot.

First of all, it smells... Sweet. But with a moderate hint of gasoline.

It also will remove glue, varnish, paint, epoxy, as well as pretty much any coating that is not... crysalized as part of the base metal. This may not be true for catalyzed paint.

I am now soaking JB weld in E85 and will see how that goes.

Thanks for everyone's warnings.

mark kibort

For all the crap you gave me on my project, I could tee off on you for this one, but I wont. However, soaking JB weld in gas, will not simulate the environment in the heads. the problem, if there is one and I tend to agree with you idea, is that the extreme tempurature cycles could possibly loosen them. however, having seen jb welld on heads before, as well as my luck on the radiator plug, JB weld is very stable. once it cures, it is pretty immune to most any chemical, especially a 12:1 gas vapor exposure.

mk

BC

Listen dillard, first, I chide you on stuff that has to do with monumental mistakes like assembly lube on piston skirts, and putting cometic gaskets on with heads that have a surface like the dark side of the moon. Or other wildly hilarious stunts of wonder and dare, like thinking Porken's tool was wrong but somehow, by the grace of your ego, you were right.

I am not soaking JB weld in gas. I am soaking it in ethanol. It has 15% gas, but JB weld is fine in gas, as it has held up countless years in gas tanks. BUT ethanol has been shown in certain instances to not be compatible with the resin in JB weld. I need to see in its hardened state whether this is true or not.

JB weld can handle up to 400 degrees constantly, iirc. If they head gets that hot in the intake port with ethanol cooling it at every spray, then there are other problems. It is extremely stable.

I am not trying to hold something together structurally. Its a small plug so the air has a constant boundary layer as it goes down the port.

docmirror

You're determined to use JB weld. Move along, we've given you the warnings. I don't care what the results of the Ethanol test are, it's still going to come apart later.

BC

I'm not determined to use anything doc. I hope that it does not seem that way. If it does I have written the wrong phrases or made the wrong comments.

JB weld does have a bad rap though. Have you looked at its true characteristics?

The ethanol tests are indeed important, as it seems to hold up in heads (did you look at that mototune site?) WITHOUT that. But I will have ethanol. So if thats the straw that breaks the camel's back, then...

Jim bailey - 928 International

reminds me of ...("you'll shoot your eye out")

Hilton

FWIW I'm actually interested in the outcome of your experiment with JB weld Brendan - would be good information to have given how useful it is in general, and how much of a b*&$h it is to remove from things.

Mrmerlin

after this test take a torch with a Mapp gas cylinder and direct it towards the JB weld see how long it takes for it to burn

Imo000

man oh man...... This is a train wreck waiting to happen.

The ethanol soaking"test" is not enough. If you really want to see what happends (since you don't seem to trust anyone else's judgement), subject a test head in an envoronment that simulates real life conditions. 100s of heat cycles, under constant ethanol mist, do this for twice aslong as you plan on keeping the engine and see if it holds up.

BC

I don't see where I am unwilling to see other's judgement. I see my quotes as being open to the info but still asking questions. Not disagreeing so much as hoping maybe my situation is different.

BC

Well, its a great paint remover and degreaser. I know that now. Ports have never been so degreased. Soaking it in ethanol (the JB weld) seems an extreme test, as it does evaporate and atomize very quickly once sprayed down the port.