914-4 2L #3 rod bearing failure Options

[Driver174]

Rod bearings 1,2 & 4 look good, but #3 not so good. This engine has approximately ten race weekends sense it was rebuilt. Has anyone seen this issue?

[Driver174]

I do believe adding more air exit area from the oil cooler will help with cooling oil. I’d rather not put exit holes through the hood, but wouldn’t mind increasing exit hole size in trunk floor. Was trunk floor exit not effective?

[brant]

I do believe adding more air exit area from the oil cooler will help with cooling oil. I’d rather not put exit holes through the hood, but wouldn’t mind increasing exit hole size in trunk floor. Was trunk floor exit not effective?

trunk floor wasn't a total failure for me

my first cooler duct, had a very short exit that only cut about 8 inches back (from the cooler exit to 8inches rear ward in the trunk floor)

my 2nd exit duct, but back about 10-12 inches into the trunk floor and the improvement showed up on the oil temp gauge.

I then went to the hood soon there after...

but I think a trunk floor exit that cuts back at least a foot into the floor (or more) is still doable.... look at the GT/6 style cooler ducts. they probably cut 12-18inches back, and should work.