x2. Pics or it hasn't happened!

 

He said there great pistons just that they had piston slap on start-up..

he said he would not worry about it.. as its that way with alot of forged pistons..

i make it out to sound much worse then it really is... chad herd my car.. whats you oppion!?

 

i didnt think it was that bad to be honest sounds like a built motor lol

 

It should not sound like a diesel truck, but at the same time the aftermarket forged pistons will be much louder than the factory cast pistons. Most of the forged turbo pistons are made of 2618 alloy which expand more than the less expensive 4032 alloy forged pistons. Due to the higher expanding rate of the 2618, you will run a bit more piston to wall clearance than the 4032 and that means more piston noise during startup or when the motor is not up to temp.

.003" wall clearance is about right, we run .0035" wall clearance with a skirt coated CP 2618 alloy turbo piston. For 4032 alloy, you'll probably run a tighter .0025-.003 wall clearance since 4032 does not expand as much.

MrC

 

ive had a couple people with JE scions say that they sound like a diesel

 

wait a minute, you guys don't ike loud motors?!!?!

 

I installed CP Pistons on my built B16A, and the car sounds like a diesel only at Idle...Not much piston slap upon startup as well.

 

also iron dutile sleeves echo alot of noise and i've can't remember my clearences off the top of my head since i've been built for a year now but i have wiesco and on cold startup they slap but once warmed slap goes away. So if the shop that built it says its good and when you ready to boost 27psi you say when ever your gonna tune it. LOL the guy that helped me build mine said after 1000miles i was good to go.
so i always take there word for it.

 

It will sound bad to anyone who hasn't heard it before! Some pistons do it and some don't. On ScionGT35R 's car the CP pistons slap on start-up, I have installed Wiseco on another car and they don't slap on start-up. Both of these cars use standard size pistons on untouched cylinder bores (completely stock).
You don't need to worry about it at all. Just make sure there are no pretty ladies around when you first start the car in the morning

Pito

 

thanks for that info guys (p-tuning & Pito)....Iv never built an engine for performance (just normal rebuilds) and would have freaked me out when i get this project finished and start it up for the first time...lol

 

Hey bud, this is Justin from WV..

Your ok, The lower the silicon content of a piston the more piston to wall clearance it will require.. JE can make both types.. Alot of companys do it different.

My 1200RWHP street supra uses JE pistons, the only difference is probably the skirt and crown is coated on mine(hardly anything, and wont do anything for the noise you hear) I have over 9000 HARD miles on this car and it had the same JE piston you are using..

You should notice however that once the car warms up the noise will subside to almost 0. Once operating temp is reached the piston to wall clearance will fill the void. Trust me you wont have a problem..

I have used JE for over 10 years in a nitrous/ blower s-runner, 3 supras, turbo tc, ford lightning, 5.0 fox.. all great results! I highly request them.


Justin

 

Thanks so much man, yea it goes right away after warm up! good call..

Btw never received any gas if you havint shipped it.. ill take straight meth instead!

 

Oh the things I would do to own a 1200hp Supra!!!

 

Agreed. It's normal. I have used JE in the past it's the different alloys.

I personally like Wiseco and CP

 

I am knew here but I couldn't help but read your post... JE pistons use a harder metal than most of the other forged pistons. There for they have a lower thermal expansion rate that the other pistons... I am using JEs in my 2jz, I have built motors with everything from supertech to wiesco... for the money I would rate JE and wiesco at the top. I have a customers 420a eclipse in my shop right now that has JEs and it does the same thing nothing to worry about. Hope you found this helpful

 

Mike

Hey I didn't get to read the whole thread but JE pistons are normally like that. They're great pistons actually - the sound is referred to "piston slap" and that is due to the composition of the materials JE uses in their pistons. Once the metal expands (when the car is fully warmed) the noise goes away. JE pistons are some of the strongest out there....

The only thing I've had to do extra when I had JE's on a prior car was to hand debur the top of each piston to smooth out any sharp edges.

 

Yea. they have been working great so far I learned to deal with the noise as it goes away on warm up like stated!

 

Seriously!! My thoughts exactly!! LOL

 

Just watched your youtube vids in your sig OP, Nice car. My je pistons werent too loud in my srt...dunno if its just a tc problem or what. id see what je themselves have to say though.

 

ummmm...piston slap is no good no matter if its the first five minutes or the whole time that ruins the cylinder walls...usually piston slap happens when the skirt on the piston is broken or cracked. it sounds like your piston isnt seating right to me. thats just my input. also what did you bore it out to?