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will JB weld fix this??

P

pac1085

Diamond Member
picture

oops.

told my friends "just one more run before we leave!" yesterday at the track, and it didn't work out in my favor.

stock pistons didn't like 100hp per cylinder, oh well - time to upgrade - I have a built engine sitting in the garage. figured this would happen sooner than later.

the car is a 97 audi a4 1.8t with a holset hx40 turbo running standalone engine mgmt (Megasquirt)
 
Originally posted by: drnickriviera
Did the megasquirt guys finally do a full engine mgmt box? or are you just taking about FI?
Click to expand...

vanilla megasquirt only handles the fuel, but with the "extra" code you can also handle the ignition. I am running Megsquirt-II/Extra which is running both the fueling and ignition. I still have the stock ECM installed to control things like the air conditioning.
 
Originally posted by: alfa147x
Wait you can repair a piston with JB weld?!?
or are you guys just kidding around?
Click to expand...

While I'm sure that somewhere, someone has done it on a true beater of a car, we're just kidding around with this one.

ZV
 
Time to rebuild that engine. At the least it will need new pistons
and the cylinders bored out and honed.
 
Originally posted by: bruceb
Time to rebuild that engine. At the least it will need new pistons
and the cylinders bored out and honed.
Click to expand...

Meh, just stick some chewing gum in there to block the blowby past the rings and call it a day.
 
the block is trashed, the most you can bore it to is 83mm (stock is 81) - even an 83mm bore wouldn't fix it.

It's going to be replaced with a freshly built 2.0 stroker, forged pistons, rods and crank.
 
i drove the car home 35 miles home from the track...no problem! had to pull over every 5 miles to add more oil, though.
 
If it did work it would probably work for a couple of sec (couple of mins if your lucky) and break off in the combustion chamber. Probably damage the engine further.

You will have been luck taking lead solder (high temp) and melting it over the broken piston edge, then using a file and sand paper to smooth it out perfect. But then it will probably either melt in the combustion chamber. I think if you just replaced the piston and that was it you will probably go a long way. Pistons are not that expensive. I think 1 new piston and ring set will probably run you back 50 bucks tops. The mark in the piston wall can only be repaired if the piston wall was resleeved or the block was replaced. Measure the depth of the mark in the wall. If it's within limits you could probably oversize the piston and replace with an oversized piston. But I think you also have to do all the the others as well. If not the engine will be thrown off balance. Tell me what you do. I'm interested in how it turns out.

Lots of work to do.
 
Originally posted by: paulxcook
Originally posted by: alfa147x
Wait you can repair a piston with JB weld?!?
or are you guys just kidding around?
Click to expand...

I know almost nothing about cars but I'm pretty sure they're kidding.
Click to expand...

Yeah, this is clearly a job for just some seafoam...no need to break out jb.
 
Wow... I've never seen a piston go out like that.

For a second I thought that taking the block out 2 mm was tiny (I work with American engines, I'm working on an engine 30 thou over) until I converted to inches. It stinks that you did that much work and will have to redo every thing.
 
Some funny posts in this thread....Hell a can of Restore can fix that. Didn't you see the commercials, it can rasie compression pressure by 30-40 psi, it's a turbo in a can.

 
Heat soak or too much timing/boost/not enough octane? Those are some pretty beefy ring lands.

Curious what the plug for that cylinder looks like.
 
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