[gsw]

http://www.pistonslap.com

Enjoy peoples you can even listen to the sounds of piston slappings. Some one must of been a most annoyed customer to make this site.

 

[TopGhia]

One look at the piston and you can see why it's slapping.

 

[rob_o]

Haha - a Diesel sounding GEN III!

 

[honer]

Hahaha.... Alot of cranky GM owners by the looks

 

[Supa R00]

18.6% are 5.7L's... geez i never knew that!

 

[Ambrose_1]

that sounds like ass!

 

[RaTTuS]

0_o nasty

 

[Ambrose_1]

What is Piston slap? is it hitting the cylinder head?

 

[pauljh74]

its when the piston has enough room to move side to side in the cylinder. The pictures on the site show wear on the sides of the cylinder bores. Gradually it wears the cylinder into an oval shape, which isn't good when the pistons are round (or at least start off that way).

 

[Ambrose_1]

So the piston is to small or something? or the piston rings suck? wouldnt it cause more problems if the fuel goes down past the piston?

 

[pauljh74]

It's probably due to the piston rings being a poor fit/too small, or being worn, which would be a problem in old cars with worn engines. I think GM tried to have a looser fitting piston ring to reduce drag and therefore fuel consumption - do you think it worked well?

The fuel is usually a fine mist or turned into a vapour when it gets into the combustion chamber - so I don't think it is around long enough to run down the cylinder too far. I think the other way with oil usage is the bigger concern.

 

[laminge]

If you have a look at the site, he has a full explanation of the cause of piston slap

 

[EFXR62]

Isn't this the same as when the alloy blocks get too hot in the holdens, causing the cyinder to warp, and therefore creating piston slap?