Thread: 302 oil pressure

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Originally Posted by DennyW

On this road runner engine that will run between 62-6500, we are using sheafer oil blend. Rods at 2, mains at 2.5. Side clearance 15. full floating rods.

Have you tried the V bearings ?

No we have not.
I have heard other racers say they worked very well for them.
We have used some of the coated bearings when the crank was on the loose side to take up some extra clearance in street cars and have good luck with them.
My only worry is at hi-rpm/hi-load applications that the coated bearings might start to lose their coating.

In the turbine-generator industry (gas or steam) it is common practice to build up old journals with chrome. Although these journal bearings have comparable surface speeds to high performance gasoline engines they lack one very important operational factor; and that is fatigue.

Our automotive engines pound the crap out of all the bearings, particularly the crank and rod bearings. I have applied some coatings to hydrostatic and hydrodynamic bearing journals that might well hold up and work well. But you need to be rather wealthy to afford such procedures. And I ain't at all sure it would win you races or reduce costs in the end ...........

Kitz

Originally Posted by kitz

In the turbine-generator industry (gas or steam) it is common practice to build up old journals with chrome. Although these journal bearings have comparable surface speeds to high performance gasoline engines they lack one very important operational factor; and that is fatigue.

Our automotive engines pound the crap out of all the bearings, particularly the crank and rod bearings. I have applied some coatings to hydrostatic and hydrodynamic bearing journals that might well hold up and work well. But you need to be rather wealthy to afford such procedures. And I ain't at all sure it would win you races or reduce costs in the end ...........

Kitz

We use to hard chrome the cranks but now we can buy a good 4340 crank for less than $500.

we can now adays get a good 4340 crank and rods, plus forged pistons and bearings and rings for less than $900

but actually even me being one of the young guys i have hard chromed a crank because it was the cheapest way to fix my crank that got chewed up..... crank lasted about the life of the motor