reducing engine knock

[simple]

Will changing the weight of oil help engine knock? Going thicker or thinner?

[Butch 02 Denali]

Absolutly thicker oil will help, and it will also stop or slow down more wear. Stop the noise/stop the wear.

 

Butch 02 Sierra Denali

[JayMan]

Sorry, referring to spark knock or rod/lifter knock?

[Butch 02 Denali]

Good question, I was referring to cold start knock, the pistons wobbling around in the bores at the bottom of the stroke till they expand from the heat and fill the bore better. The more they knock, the more they wear, the more they wear the more they knock. The knocking noise is the piston slamming the cylinder bore due to worn skirts, due to them being so short and small. Heavier oil will cushion the metal to metal contact.

 

Butch 02 Sierra Denali