PorschePhD

This is a motor I am finishing up and thought I would share. This crank has been crossed drilled and knife edged. What that means is the crank has had the counter weights ground down to a knife's edge to slice through the air of the case and oil. By creating a knife edge the resistances less which means friction is less and the crank can turn over faster and easier than say it's counter part. By cross drilling you are increasing the oil capacity to the bearings. Under very high RPMs the oil pressure has to overcome the centrifugal force and pump now hot thinning oil to the surface to properly lubricate the bearing. By adding a second hole strategically placed this ensures that at high RPMs the bearing is not starved for oil. Balance the whole assembly, add a few coatings and you have one of the best crank setups as possible.

Just thought some would like to see and know the difference.




Here is a normal crank. Notice the thickness

Brent 930

Stephen,

Very cool

What kind of performance difference would one notice from doing this? How much does it cost assuming your already in there. No I don't plan on ripping apart my engine just for that but I was curious.

Thanks,
Brent

viperbob

Sweet! The knife edging also reduced the reciproocating weight by what, 10 lbs or so? Plus then the other benefits that you mentioned for reduction of drag.

SoCal Mike

Stephen, that is so cool. Thanks for sharing shop pics like this.
Just too cool!

PorschePhD

My pleasure....I have something going on most of the time. I know we talk a lot about the things we do, but to see it is another. Good for the mind to connect.

Sameer

Stephen,
You are good....very very good.