Trajic

Ok just got some JE pistons installed and they rattle alot whent he car cold but at soon as it warms up it stops. they told me that was regular becouse je pistons anre cold pistons and that they get bigger with heat. I thought they overbored my sleeves. should i worry

liam821

mine did the same thing. They made a knock knock noise. I was also told this is a normal noise so i never worried. Although i broke my pistons when my fuel computer broke at 16psi of boost and the car went super lean. But i still got 10,000 miles on the motor before that happened without problems.

liam

GSRacer

it sounds like a diesel engine right?? yeah that's supposed to be normal.

MackSpeed-616

did you get je's or srp's?

Lsos

Make sure you don't gun it when they're still cold. That can't be good for them.

Honda Hick

Yea my SRPs are loud as hell when cold too. I guess its normal

speedworks

je's have floating wrist pins,this is some of your noise. pressed pins are quieter but rob horsepower. dont worry

Davy Crockett

Cant see how this can make noise.My engine has also floathing wrist pins (stock pistons) buyt i have no noise at all.

I have heard about people who had trouble with cyls who wears out of specs fast with JE`s is this commond or have i listen to the wrong people??

ps he used Total seal rings,can that be the reason?

Jared

Total seal rings absolutely suck, Don't get me started on them again. I've never seen bigger pieces of trash.

Confuishus

My engine has no internal work done to it and it sounds like that (semi truck, deisel sound). I just did a valve adjustment so, I know it wasn't that. The car pulls really good and sounds good when I rev the engine up, but just has that knocking sound. I only have I/H/E. Should I have a real mechanic take a look at it? or don't worry. The car only has 23k miles right now. Thanx in advance

immortal

the knocking sound is normal during start up.

Confuishus

I can still hear it after driving for a while. I can only really hear it when the car is at a standstill.

Arturbo

If your car only has 23k miles I would take it to the dealer for warranty work. A motor we had sounded like that with JE and SRP pistons and it sounded like it was coming from the head. We couldnt figure out what it was, but when we took the oil pan off and found out we spun a rod bearing.

art

Confuishus

thanx Art, I'll be calling them up today.

IN VTEC

iTrader: (3)

The knocking noise might be caused by piston slap b/c of the loose tolerances that the pistons have with the cylinder bore. This happens b/c of the metallurgy of the pistons, which are lower in Silicon(e)? content than the stock cast slugs. They fluctuate in size more with temperature than a high Silicone slug causing the tolerances to loosen up when the engine is cold and then tighten up when the engine warms up.

TRM04

Is it normal to see a little blow by from the valve cover breather with JE pistons? Some days I see more than others.

speedworks

DamonBoost

what is wrong with total seal rings?

hydroflip

ok...if this sounds dumb u all can flame me...but...could it be your valves knocking? because i thought that they make noise when you start up the car but as your car heats up the valves expand...so then it stops...is it the same with pistons? or am i just a big dumbass?

Smashback

Forged pistons "clack" until they warm up. They expand slightly as they heat up. I've always run big nitrous shots on my domestic motors and considered forged pistons a necessity. I have never had any premature wear cause by the pistons


[Modified by mplex2000, 11:35 AM 11/15/2001]

rtype11

As mentioned by everyone it is due to thermal expansion, cold - these pistons have a slightly smaller circumference until they reach engine operating temperature, it is important that if you run these pistons with a standalone computer that you have a good short (lean) warm up enrichment to get them up to temp faster, the slapping can hurt your bores a bit and remove the hone work.
Silicon is not a metal, it is sometimes grouped with elements like Sulfur and Phosphorus as a "metaloid".