The famous 'piston slap' - possible solution found

Reply Subscribe

Thread Tools

Search this Thread

Jul 20, 2010 | 03:23 PM

#21

ztheusa

Safety Car

Joined: Sep 2000

Posts: 3,572

Likes: 420

From: Taildragers rule! USA1

You can do the same thing by dropping two tablespoons of oatmeal in your oil.

Jul 20, 2010 | 03:24 PM

#22

AU N EGL

Team Owner

Joined: Sep 2003

Posts: 43,084

Likes: 33

From: Raleigh / Rolesville NC

Only cure is a accu-sump or a dry sump oiling system and prelubing the block prior to cranking it over.

No piston slap here. accu-sump oil cooler combo and 15-w50 oil

Jul 20, 2010 | 03:35 PM

#23

madmatt9471

Team Owner

Joined: May 2006

Posts: 21,473

Likes: 356

From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----

Got a link to this stuff?

Thanks,Matt

Jul 22, 2010 | 06:58 PM

#24

tail_lights

Race Director

Joined: Apr 2009

Posts: 10,581

Likes: 252

From: SE TEX

My EX-tuner (Henderson Performance Technologies, HPT, New Braunfels, TX) told me I had piston slap at 5k rpms and higher when WOT. The car would start breaking up bad. Turns out she was outta fuel

Not sure how it made it on those pulls but I made my own restrictor out of duct tape and it could pull clear to rev limiter. My current tuner got it on their dyno and realized the issue, installed a Racetronix fuel system and VIOLA!!! "Piston slap" was gone

Jul 22, 2010 | 08:31 PM

#25

SCM_Crash

Le Mans Master

Joined: Jul 2009

Posts: 9,526

Likes: 12

From: Los Angeles California

Yeah... It's funny when I pull up in parking lots (usually after driving on the freeway for some time) some people mention they could hear the piston slap.

I ask them how that's possible since the motor is hot. Some people don't know anything about motors or what piston slap is and pull random comments out of their butts.

Jul 22, 2010 | 10:01 PM

#26

dklowrider

Drifting

Joined: Jun 2010

Posts: 1,434

Likes: 2

From: Harrisburg Pa.

Quote:

Originally Posted by SCM_Crash

Yeah... It's funny when I pull up in parking lots (usually after driving on the freeway for some time) some people mention they could hear the piston slap.

I ask them how that's possible since the motor is hot. Some people don't know anything about motors or what piston slap is and pull random comments out of their butts.

any time the motor makes noises it's piston slap.

Jul 23, 2010 | 12:04 AM

#27

paint-tech

Racer

Joined: Feb 2010

Posts: 388

Likes: 0

From: Effingham IL

My 01 and 02 are both quiet on bottom and not even a peep out of the valve train. I use amsiol oil and fiteration.

Jul 23, 2010 | 06:44 AM

#28

4SFED Z

Melting Slicks

Joined: Jun 2007

Posts: 2,704

Likes: 4

From: Lone Star State

Quote:

Originally Posted by oneshot

I too switched to a WIX filter but I still use Mobil 1 oil and the piston slapping noise or valve train chanter is almost gone.

Louder exhaust and louder stereo will not hurt either.

I agree. Louder exhaust, stereo, and cam makes it all go away

Piston slap is normal. as others have said, goes away when car is warmed up

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Joe Kucinski

Every 2027 Corvette Engine Explained

Joe Kucinski

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Verdad Gallardo

10 Ugly Corvettes That We Still Kinda Love

Joe Kucinski

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

Brett Foote

10 Things Every Corvette Owner Needs (2026 Edition)

Michael S. Palmer

8 Most "Only Corvette Owners Understand" Quirks and Problems

Pouria Savadkouei

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Joe Kucinski

How Much Horsepower Every Corvette Engine "LOST" in 1972

Joe Kucinski

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Michael S. Palmer

Jul 23, 2010 | 08:19 AM

#29

Chevy-SS

Thread Starter

Drifting

Joined: Nov 2007

Posts: 1,616

Likes: 11

From: Newport, RI

Quote:

Originally Posted by SCM_Crash

......... some people mention they could hear the piston slap.

I ask them how that's possible since the motor is hot. ....

Huh? What are you talking about? Piston slap is absolutely, positively, most assuredly, 100% possible with a hot motor.

-

Jul 23, 2010 | 08:45 AM

#30

Mike Mercury

Team Owner

Joined: Apr 2001

Posts: 54,204

Likes: 180

From: S.W. Ohio. . . . . . NRA Life Member

summary of the OP's initial post:

"Mis-diagnosed piston slap noise - corrected through other means"

and it may be true.

Jul 23, 2010 | 02:18 PM

#31

dklowrider

Drifting

Joined: Jun 2010

Posts: 1,434

Likes: 2

From: Harrisburg Pa.

Quote:

Originally Posted by Chevy-SS

Huh? What are you talking about? Piston slap is absolutely, positively, most assuredly, 100% possible with a hot motor.

-

if you're speaking in general terms, yes piston slap is entirely possible with a hot motor. if you're talking about my ls1 car that has piston slap noise when cold, then it goes away when the motor warms up, and someone says "i hear the piston slap noise", then no.
i think the latter is what scm was talking about.

note, i said i think.

Jul 23, 2010 | 03:42 PM

#32

00Corvette

Melting Slicks

Joined: Sep 2006

Posts: 2,736

Likes: 7

From: Redding CA

Quote:

Originally Posted by SCM_Crash

Piston slap is caused by the material difference between the piston and the sleeve. There was some room added between them because they expand from heat at different rates due to the different metals they're made out of.

Ditto

Jul 23, 2010 | 04:31 PM

#33

ColeTrain'sC5

Melting Slicks

Joined: Jun 2007

Posts: 2,172

Likes: 1

From: Sartell Minnesota

ZMax LOL what a gimmick

Jul 23, 2010 | 04:58 PM

#34

angman5

Drifting

Joined: May 2003

Posts: 1,529

Likes: 2

From: Lakeland FL

Cam headers and a Borla cat back will fix that slap noise I have not heard mine in years

Jul 23, 2010 | 05:36 PM

#35

SCM_Crash

Le Mans Master

Joined: Jul 2009

Posts: 9,526

Likes: 12

From: Los Angeles California

Quote:

Originally Posted by Chevy-SS

Huh? What are you talking about? Piston slap is absolutely, positively, most assuredly, 100% possible with a hot motor.

-

You know what piston slap is, right? If your motor is hot and the metals have expanded, you may have *some* piston slap, but it won't be enough to hear if any at all. With the right lubrication, you shouldn't have any piston slap while the motor is at it's operating temperatures.

Jul 23, 2010 | 06:43 PM

#36

Atok

Melting Slicks

Joined: Apr 2003

Posts: 2,150

Likes: 6

From: NS

Quote:

Originally Posted by ColeTrain'sC5

ZMax LOL what a gimmick

But Carol Shelby uses it in all his cars. You mean it's not as good as he says?

Jul 23, 2010 | 09:04 PM

#37

moserbe

Race Director

Joined: Dec 2005

Posts: 11,664

Likes: 15

From: Wellsboro Pa

Quote:

Originally Posted by Atok

But Carol Shelby uses it in all his cars. You mean it's not as good as he says?

He's just trying to make more money for his younger wife.

Jul 24, 2010 | 09:12 AM

#38

Chevy-SS

Thread Starter

Drifting

Joined: Nov 2007

Posts: 1,616

Likes: 11

From: Newport, RI

Quote:

Originally Posted by SCM_Crash

I think I said earlier - I believe most everyone on this forum knows what 'piston slap' is. It's a very simple concept to grasp, i.e., the piston being slightly loose in the bore.

The engine could be red hot and you could still have piston slap, IF there were excessive clearances between the piston skirt and cylinder wall.

-

Jul 24, 2010 | 03:38 PM

#39

ColeTrain'sC5

Melting Slicks

Joined: Jun 2007

Posts: 2,172

Likes: 1

From: Sartell Minnesota

Yeah ZMax is about as good of stuff as the Intake Tornado...

Jul 24, 2010 | 04:06 PM

#40

road dog

Burning Brakes

Joined: Aug 2005

Posts: 798

Likes: 2

From: Notorious Miami sunny south florida

I have a 98 and never heard of the famous piston slap issue. what years have this problem I've heard that the 2001 have oil consumtion problems but never heard of piston slap. I've never heard piston slap on my vette never

Last edited by road dog; Jul 24, 2010 at 04:10 PM.

Reply Share

First
Prev
2 / 3
Next
Last

Forum Jump