Re: Raising compression using Jb Weld?
 

it works. my pistons were milled so to reraise the compression i applied some jbweld. it works well and gives that extra power

Re: Raising compression using Jb Weld?
 

http://jbweld.net/products/jbweld.php

good up to 500 degF

avg. ATV cyl. temp on fairly hot day 230-240 degF

If it will hold up to the pressure the I don't see why not.

In my experience, JB weldi s terrible on radiator applications or other liquid applications because the liquids eat through it and soften it up. Plus it's hard to properly prep an area that has liqud going through it so that gets half assed most of the time.

Re: Raising compression using Jb Weld?
 

Ya I tried fixin a radiator with jb weld it craked in the same place 3 days later

Re: Raising compression using Jb Weld?
 

I used JB weld on my header and it melted/burned right off.

Re: Raising compression using Jb Weld?
 

my dad once used some JB weld in his exhaust port on his suzuki LT500 quadracer.. the jbweld charred...
in the cylinder the jbweld will be exposed to high heat.. even if the head doesnt get as hot.. the JBweld isnt a head... it wont last long and will probably cause detonation

Re: Raising compression using Jb Weld?
 

you all are clearly retarded

Re: Raising compression using Jb Weld?
 

Maybe not JB weld...but there may be an industrial "liquid steel" that can withstand the heat and pressure. At least on smaller engines that don't get very hot. I doubt it would work on the cyl walls because of the added friction, but maybe adding a little on top of the pistons?!? I've never heard of it being done before and there's probably a good reason why it's not commonly done. I wouldn't do it but I could see how it would be feasible if you found something tougher than JB Weld.

Re: Raising compression using Jb Weld?
 

Not recommended for use on manifolds, exhaust systems, and other engine components which normally operate at temperatures above 500° F.
http://jbweld.net/products/uses.php
yet they reccomend it for cylinder heads

I love the stories they have on there
"I own a dragster. During a competition, the cylinder head cracked. I didn't have time to repair or replace it, so I filled the crack with J-B WELD. Well, I made my time trials, and took second place! The head still works great, and I'm not going to order a new one."

"My pickup threw a rod and tore a hole in the block. I plugged the hole with large washers bolted together and sealed it with J-B WELD. That was over 50,000 miles ago; still with no loss of oil. Thanks for a remarkable product!"

Re: Raising compression using Jb Weld?
 

engine temperature =/= combustion temperature

Re: Raising compression using Jb Weld?
 

ok so final answer is........