hi everyone,

my question is, that will a clevite h series chamfered bearing live more than 20,000 miles on a 4340 eagle crank?

the crank calls for them, but i was told a few years ago that h series was desined for racing and not for street use, and i really don't want to have anymore engine probs...

this is going to be an street motor that may see the track 5-6 times a year,

what are your reccomendation? ede? anyone?

thanks

adam

 

I think they just spec the H series bearings for that crank because the typical usage of a very high performance crank like that would require that type of bearing - high clearance, high RPM, annual rebuilds.

I'd use a normal bearing, maybe a tad large on the clearance, like maybe a .001" oversize.

 

well i don't want annual rebuild, but i want the clearances required... a regular bearing wont work do to the lare radii on the crank fillet, so my question is, does anyone make a chafered bearing for the street?

 

You could use a standard bearing and use a razor to cut the chamfer yourself.

 

The chamfer is necessary to clear the radius on the "ends" of the rod journals on the crank. Normal stock cranks don't have that, so replacement-type bearings don't have the chamfer. Only racing ones. Which are typically made of different material, because the requirements are different; their ability to "embed" debris, their hardness, etc. They will live just fine on the street, for alot longer than 20,000 miles, especially if you keep clean oil in the engine.

 

ah. That's what I was wondering as well. From what i've heard they are much softer to absorb the sudden shock loading better. Which tends to let them wear away faster.
*shrug*, high quality filters and good quality synthetic oil I guess. Go nuts!

 

thats a big 10-4!

after initial startup and valve adjustment we will do the piston ring accel decel, than i will change oil and filter, after 500 more miles a change again, then once 3000 is there i will go to mobil 1 fully synthetic