Liner Height

[Rawze]

(01-27-2017 )Starlight Wrote:  This liner issue thread is very timely. I currently have a 2009 871 in the shop with the coolant system pressuring up. It was installed in this truck a year ago as a recon crate engine from cummins. I just finished pulling the head off to repair and found the gasket burned out on cylinder 4 exhaust side and cylinders 2 and 3 very close to burnout as well. Liner protrusions on this engine on the cylinders not burned out is .010 thou. How terrible can it get. The burned out ones i didnt measure but have no reason to believe they were any different before they burned out. This is a high horsepower 2919 CPL and cummins built it with .10 thou liner protrusion. This truck is demandated so he didnt even try for warranty but still goes to show that cummins builds these things to barely make warranty and then need to be inframed. This engine probably had varying liner heights brand new from cummins just like the one Mr Hagg is doing now. Very poor on cummins part but what can we do, I'll be cutting this block so there will be a .014 or .015 protrusion on the liners afterward.

High HP and factory height liners is not a good combo.

Boost above about 36-38 on it if it has the big turbo and bigger CAC, etc. and/or timing advance too high can cause it too on high hp engines.

http://rawze.com/forums/showthread.php?t...5#pid11615


Just some things to avoid.

Personally, At max torque, I like to see them with a final injection mapping at around 4-6 deg. max and about 36 psi boost or so to help keep vibration down and reduce risk of detonation.