#ring

Pete writes:

Hey Sajeev, I got one for you.

Several engines nowadays are set up to operate on half their cylinders under light-load conditions. Would the design considerations for piston rings vary from those normally used for such cylinders that are only used part-time? The question arises in the context of a 2009 V6 Accord that is currently in the Honda dealer’s shop to have the piston rings replaced at the manufacturer’s expense to cure a continual oil consumption and spark plug fouling problem.

TTAC commentator EducatorDan/PrincipalDan writes:

Long time listener, comment-er, hanger-on with another question.

I have a 2004 F150 Heritage 4×2 that just cracked the 100,000 mile mark and recently I’ve noticed a distinctive rear differential whine. It has the 4.6 V8 mod motor, 4 speed auto, and (as you can see from the pics) an aftermarket flatbed.