Balancing and lightening the crank shaft???
 

ok im building a D over winter and im thinking about having my crank shaft lightened and balanced but i have a few questions....lightening the crank will make higher rpms more achieveable but will it weaken the actual crank itself im shooting for 400hp will it be able to with stand the pressure along with revving out to about 8500? and what should the minimum weight be ?...also how much does something like this run at the machine shop?

Re: Balancing and lightening the crank shaft???
 

if you have to ask, you can't afford it :)

Figure 500 or more for the crank work

Re: Balancing and lightening the crank shaft???
 

just balance it, i don't believe turbo motors need lightened cranks; least i don't believe in it.

Re: Balancing and lightening the crank shaft???
 

Get a good balance and polish. That only costs like $50-$100.

Re: Balancing and lightening the crank shaft???
 

thanks ...

Re: Balancing and lightening the crank shaft???
 

where? I paid like 275 :X

Re: Balancing and lightening the crank shaft???
 

Yay CO! I paid $100 for balancing of all my bottom end parts(crank, flywheel, pulley,pistons,rods,clutch,pressure plate) all balanced to themselves, then eachother. Then I paid $50 for a poslish/magging(check for cracks),check for straightness.

Re: Balancing and lightening the crank shaft???
 

just buy a forged, lightweight crank.

Re: Balancing and lightening the crank shaft???
 

thats $1500-2000 since none are made, nor needed :)

Re: Balancing and lightening the crank shaft???
 

well i'll look into it i was thinking about having it done but if it cost more than a aftermarket 1 then i was just going to buy 1 of those///anyway i think im just going to have it balanced and see what happens

Re: Balancing and lightening the crank shaft???
 

I have to agree with the balancing and micro-polish. Way too much money for lightening work and then to have it nitride coated again. Want it to rev faster? Light weight flywheel will take care of that...will suck in traffic though and up hills as a DD.

Re: Balancing and lightening the crank shaft???
 

I'm a D lover and can't see dropping that kind of money into a SOHC.

But then again my cylinder head for my next D15 is worth over $1000 and I've yet to get springs/retainers.

Lucky for me my porter doesn't work on trannys, we swapped labor. I build his transmissions, he ports A head.

Attachment 31700

Attachment 31701

Re: Balancing and lightening the crank shaft???
 

^^ thats nice ...im having my head fully ported and polished with a full comp valavetrain and cam....but if its to expensive to have it lightened im defenitly having it balanced and polished

Re: Balancing and lightening the crank shaft???
 

i was also thinking pros and cons and a lighter crank would be more suitable for a NA build ..rpms would rise and lower to fast kinda like a lighter and heavier flywheel