Do all LS1 engines have the piston knock ?

**Speedy_Gonzales** · 11-24-2006, 07:45 PM

Do all the LS1 engines have the piston slap at start up, that goes away ?

**fast droptop** · 11-24-2006, 08:03 PM

My 98 didnt but my 01 does at start up some of the time. Goes away in a matter of mins

**Speedy_Gonzales** · 11-24-2006, 08:16 PM

Originally Posted by fast droptop

My 98 didnt but my 01 does at start up some of the time. Goes away in a matter of mins

ya thats the way mine does. I was worried at first lol

**Y2KPewterSS** · 11-24-2006, 08:17 PM

I have had a pair of 2000 LS1's now and been fortunate that neither of them had the piston slap.

**Speedy_Gonzales** · 11-24-2006, 08:25 PM

Originally Posted by Y2KPewterSS

I have had a pair of 2000 LS1's now and been fortunate that neither of them had the piston slap.

will it hurt anything ??

**SeVeReDiStOrTiOn** · 11-24-2006, 10:32 PM

I have it...goes away way before reaching op temp

**djvaly** · 11-24-2006, 11:28 PM

make sure ur on 91 or 93.. else it would knock..

**98Z-28Camaro** · 11-25-2006, 07:09 AM

Mine doesn't as of right now. 77k

**djvaly** · 11-25-2006, 04:12 PM

Originally Posted by KageSS

Higher octane doesn't have anything to do with it.

engine knock he is talking about right?

**Speedy_Gonzales** · 11-25-2006, 05:36 PM

Originally Posted by KageSS

He's talking about tapping noise that lifters make on start-ups when Eng. is cold. I think.

I know he said pistons, but i think he meant to say lifters.

ya lifters knock on cold start then go away

**AKIRA** · 11-25-2006, 05:39 PM

Originally Posted by KageSS

He's talking about tapping noise that lifters make on start-ups when Eng. is cold. I think.

I know he said pistons, but i think he meant to say lifters.

He got it right. The term is called piston slap. However, it isnt cured by higher octane as you said earlier.

**Tyler_LS1** · 11-25-2006, 05:40 PM

LS1 have Hydraulic lifters right? it may be that one is sticking just a bit.
I know my Truck sticks a bit at a cold start.

**djvaly** · 11-25-2006, 06:00 PM

Originally Posted by KageSS

Like i said before, it doesn't have anything to do with the octane rating.

aha, yeah I see, I thought u are just having knock problem, piston slaping
not sure mine does that,,, probably until the engine warms up, maybe it has to do with the starting temperature of the engine until it gets to warm level.
like here in TX it doesn't dip below 40 usually. but in Colorado it dips to 15-20F so it may start piston slap at that low of temp. not sure. mine doesn't do it.

**djvaly** · 11-25-2006, 06:16 PM

Originally Posted by KageSS

I don't have that problem. You have me confused with someone else. And i'm from Texas also.......

ayy. u are right,, TX pal, I'd like to piston slap that avatar of urz.

I know ur from TX I was just making a point, other people like in Colorado etc may experience it more often,, I dunno

**Tyler_LS1** · 11-25-2006, 06:23 PM

Originally Posted by djvaly

ayy. u are right,, TX pal, I'd like to piston slap that avatar of urz.

I know ur from TX I was just making a point, other people like in Colorado etc may experience it more often,, I dunno

I think that HIS girl.
LOL

**djvaly** · 11-25-2006, 06:25 PM

Originally Posted by Tyler_LS1

I think that HIS girl.
LOL

oops, lol

**djvaly** · 11-26-2006, 01:10 AM

hahahhaha.. more piston "power" to you!

**George141** · 11-26-2006, 06:17 AM

...you may want to experiment by plumming a coolant heater or plug in your engine block...(if you have one)..and see if that makes a difference..these engines are mild racing engines right off the show room floor so it's possible the clearances are a little loose....allways let them warm up before driving them and there should be no issues.....and like others say it clears up...

**COYOTE SS** · 11-26-2006, 02:49 PM

I have it and it doesn't go away once the car warms up. It seems to have gotten worse since the day I bought it ( with 1,900 miles on it ). I put some Sea Foam ( I don't know if that is how it is spelled ) in it and got a Dyno-Tune, that help briefly. I'll try the Sea Foam again next Spring.