knife edging the crank

[A.V.MSP]

Well im rebuilding my motor because I found out my ringlands are cracked so im going all forged, port and polished head, bigger valves, maybe bored out but I plan on running allllooootttt of boost but dont want to take a chance on cracking the block. So my question is I want to knife edge my crank, I hear it puts more stress on bearings and such because there is more vibration but how much more vibration will there be? My mechanic said its worth it to do but he doesnt recommend it on street cars because of the stress on bearings. Any info would be great!

 

[KpaBap]

You're removing weight from the counterweights of the crank therefore making it harder to balance the crank well which is where the extra stress comes from. I'll take safety over an imagined 5hp or so at redline.

Have the motor blueprinted and balanced instead.

 

[twilightprotege]

knife edging the crank is a big gainer on our cars because of the 92mm stroke. not only a big reduction in weight, but also a massive reducin in windage.

in terms of it being stressful. if it's balanced very well you'll have nothing to worry about. i will definately knife edge my crank if i ever replace the rods

 

[EEYOrE7763]

Will reducing the rotating mass on the crankshaft help with protege transmissions problems when applying double and triple horsepower numbers?