Evil EG

Ok so I put JE pistons and eagle rods in, when im at idle the car sounds like a deisel truck. Why? Is it pistons slap? Will it ever go away? The car sounds and runs awsome. Standing outside the car it sounds normal but when sitting in it, the slap sound i guess, is really noticable. Is this noraml with foraged pistons? It goes away while im driving.

MotorMatrix.com

not normal at all. is it ticking or knocking?? it could just need a valve adjustment.

Casey

iTrader: (5)

could be piston slap like you said, assuming it goes away after it warms up

intekragsr

really? I thought all forged pistons are supposed to have a lot more slap than cast stock pistons until they are warmed up

I got my car started today finally and it sounded like a diesel

MiraiZ

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by intekragsr &raquo;</TD></TR><TR><TD CLASS="quote">really? I thought all forged pistons are supposed to have a lot more slap than cast stock pistons until they are warmed up

I got my car started today finally and it sounded like a diesel </TD></TR></TABLE>

Precisely...mine sounds like a diesel until they're warm, then they sound like stock...you'll get used to it...I don't even notice it anymore

Evil EG

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MotorMatrix.com &raquo;</TD></TR><TR><TD CLASS="quote">not normal at all. is it ticking or knocking?? it could just need a valve adjustment.</TD></TR></TABLE>

No its not knocking or ticking. I just adjusted the valves last week. Its just when im at idle it sounds like a deisel. I guess from the responses its normal eh...

93LSivic

Mine gets pretty decent amount of knock when the pistons are cold. It goes away after its warmed up for the most part.
What really annoys the hell out of me is that the injectors "taps" are amplified through my sheetmetal intake manifold. Sometimes I will hear them and think that I need to adjust the valve lash....then I remember its the damn squirters

DLB1994

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93LSivic &raquo;</TD></TR><TR><TD CLASS="quote">
What really annoys the hell out of me is that the injectors "taps" are amplified through my sheetmetal intake manifold. Sometimes I will hear them and think that I need to adjust the valve lash....then I remember its the damn squirters </TD></TR></TABLE>

i dont have a sheetmetal intake manifold but my injectors sounds like I need to adjust the valve lash to sometimes
93LSivic: what brand are your injectors

lazerus

i haven't had a set of forged pistons that "diesel" untill warmed up... maybe that's because i use arias or wisecos? I've heard that a lot about JE's

Evil EG

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lazerus &raquo;</TD></TR><TR><TD CLASS="quote">i haven't had a set of forged pistons that "diesel" untill warmed up... </TD></TR></TABLE>

intekragsr

well maybe its the clearance that makes the sound. Im running a .0035 JE 10:1 flat top if that matters in my 83mm B18C.

My 9:1 Endyn Rollerwaves also "deisel"'ed in my old 84mm LS/VTEC

Diego Boost

I'm running Ross pistons and they do the same until the car is warmed up. AEBS told me it's normal for most forged pistons.

93LSivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DLB1994 &raquo;</TD></TR><TR><TD CLASS="quote">

i dont have a sheetmetal intake manifold but my injectors sounds like I need to adjust the valve lash to sometimes
93LSivic: what brand are your injectors</TD></TR></TABLE>

Im running RC 550's right now. I have 95# Siemen Deka's sitting next to me waiting to go in. Im wondering how they are gonna sound

TKERacer619

I always joke about my turbo-deisel honda. A lot of people are ignorent and will believe anything you say. hahahaha It's probably normal but for saftey sake take her to a mechanic quick. Better safe than sorry in this situation.

It should only sound like that at IDLE

DLB1994

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93LSivic &raquo;</TD></TR><TR><TD CLASS="quote">

Im running RC 550's right now. I have 95# Siemen Deka's sitting next to me waiting to go in. Im wondering how they are gonna sound </TD></TR></TABLE>

i got 72lb msd ones they tick to

MiraiZ

Do a search on "forge piston noise" and you'll find that a lot of pele experience this...its pretty normal. I also researched google news groups and almost everyone there says the same.

ekb18c

You could have piston slap. Piston slap may occur on many applications depending on the clearances used when you built the motor.

Or-

It could be just that you need a valve lash. Many people confuse the two.

If the noise goes away completely after it warms up then it's piston slap

else valve lash is required. .

lazerus

the clearance on my geo's arias are .0035. cold idle is perfect. I read an article about piston anti-slap techniques... That they can manufacture a piston very very slightly out of round, and then once it warms up it goes back to it's normal shape, thus having a tighter clearance upon cold start, and have the proper clearance once warmed up.. i wonder if i could find that article.. hrmm.....

shermanyang

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Diego Boost &raquo;</TD></TR><TR><TD CLASS="quote">I'm running Ross pistons and they do the same until the car is warmed up. AEBS told me it's normal for most forged pistons. </TD></TR></TABLE>


ditto...i just noticed the noise today when my buddy and i got done rewelding my dp and he asked me what the noise was. i was about to say the valves but i had just adjusted them yesterday. so i remembered that it was the slight piston slap from the ross pistons before heating up.

shermanyang

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lazerus &raquo;</TD></TR><TR><TD CLASS="quote">the clearance on my geo's arias are .0035. cold idle is perfect. I read an article about piston anti-slap techniques... That they can manufacture a piston very very slightly out of round, and then once it warms up it goes back to it's normal shape, thus having a tighter clearance upon cold start, and have the proper clearance once warmed up.. i wonder if i could find that article.. hrmm.....</TD></TR></TABLE>


reason why i get a slight piston slap is cause ross recommends a clearance of .006 for turbo/small bore engines using their pistons. guess it's cause turbo motors run hotter

intekragsr

is the piston slap supposed to go away after a while? Mine knocks after 15 minutes of idle.