hp build

[cbr600teardrop]

ok iv got crower rods brc 85.5 mm pistons and no balance shafts should i have my crank balanced if so should i balance it with my fidanza flywheel or with the fidanza flywheel and act 2900 street clutch or just the crank alone

 

[TOONAH]

If you plan on revving your engine over 7.5K rpm's then you should have the entire rotating assembly balanced. Stock crankshafts are only balanced to 7.5K rpm's.
You will also need to pay attention to a phenomena known as "valve float". Something to do with the resonant frequency of the valve springs occurring at a given rpm. This causes the valve to "float". Best way to describe it, is the valve spring loses tension and does not try to reseat the valve when the camshaft lobe is a t the low point. The valve can bash into the pistons and get bent. So I recommend Manley Racing Valves and springs. I am very leary of dual valve springs because they have been known to bind up. I also recommend that you use a Kevlar timing belt.

 

[cbr600teardrop]

ok thank you for the advice

 

[cbr600teardrop]

ok so i should go ahead and balance it im only running 7500 rpm for now but i may go higher later on in my build