View Single Post
Old 04-08-2020, 03:30 PM   #11
Dave in MN
Senior Member
 
Dave in MN's Avatar
 
Join Date: May 2010
Location: Jordan, MN
Posts: 1,410
Default Re: Cylinder #4 Running Hot

Over the years, I have been asked to repair damaged engines that have had inadequate cylinder to piston clearance. I have noticed that the damage is almost always at number 4 or 3 cylinders. The worst area of damage is adjoining the Siamese area of the block to either the cylinder or piston.
So based on these observations, I believe the rear two cylinders run a bit warmer. Whether block, head or coolant passage design, debris around the rear of #4, something causes the more frequent failures at the rear two cylinders.

In building engines used severely, under high sustained loads, I actually hone the rear two cylinders a couple tenths larger than the front two and as a result, do not have issues.
Good Day!

Last edited by Dave in MN; 04-09-2020 at 09:15 AM.
Dave in MN is online now   Reply With Quote