I ordered clevite p series rod bearings and i noticed that they have an oil hole in them where as the stock ones didnt . Is this a big deal ? I wouldn't think it is but i wanted to make sure .
Rod Bearing Question
- Thread starter TOOLOW91
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HotFox
15 Year Member
Nope no big deal. There made for aluminum rods with a dowl pin. Usually u can order with or without down hole. Should be a D in the part number.
CB-634 P-1 - these are my .001 over bearings and then i have standard size as well to get the clearance right . As long as the hole is no biggie i am satisfied
HotFox
15 Year Member
Yes some of the bearings they only have one part number so u have no choice. Seems like the Big Chevy 2.20 and mopar 2.375 there is a choice. Bottom line u will be fine.
That hole is an oil (relief) passage. It's perfectly fine. It also helps with crank case pressure as well by giving the oil a place to breath as surfaces are moving against each other.
HotFox
15 Year Member
Ok...how does a oil hole in a rod bearing help with a floating wrist pin at the other end of rod? How in the hell does it help crank case pressure? What surfaces are moving against each other? The rod bearing is riding on a film of oil between the crank and bearings. I've built enough race engines to know better...
Scott
Scott
You need to calm down mr. race engine builder.
Where do you think some crank case pressure comes from? Only piston ring blow by?
Movement of everything in the short block, cam, crank, rods, oil splashing around etc. Part of it is oil being churned between two surfaces. The oil doesn't just stay put, it moves through the bearing and gets pumped/moved around. This movement causes pressure.
some rods are designed with an oiling hole drilled in them to oil the floating pins.
and by the way, i have been building engines for longer than you have been alive, including race engines.
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