CplNet

Im thinking about rebuilding my y8 and replace the stock piston/rods with eagle h-rods and forged 4032 pistons..


One issue i wonder now is: if i am changing the rod/piston, the weight/bobweight will change right? So i need the crankshaft to be balanced?


I dont remember anyone saying anything about this when building d-series but it shouldn`t be an obligatory step ?



Thankz

CplNet

Researching a little more..

OEM P2P (Y8) PISTON + PIN + ROD = 715g (215~220g for the piston)

EAGLE ROD H-BEAM D16 W/ ARP2000 = 530g
SUPERTECH P4-HD755-N21 PISTON = 220G + 71G (PIN)


So oem = 715g and eagle+supertech=821g.. that is a problem right?

I can try to use a I-Beam rod to lower the weight and fix this problem?

Muckman

iTrader: (2)

No, its all balanced independently.

CplNet

If i put new piston/rods i dont need to be balanced?

I asked because was reading this article:

http://www.carcraft.com/howto/ccrp_0...g/viewall.html

Muckman

iTrader: (2)

The crankshaft should always be balanced if you intend to rev higher than stock. But adding heavier pistons/rods doesn't make it "out of balance" because you have equally heavy piston/rods traveling in the opposite direction. Its not about weight, its about balance (and harmonics).

CplNet

Ahhh, got it muckman!! Of course lol. hehe thankz

And i dont plan to pass 7000rpm i fear the y8 oil issues

CplNet

One question last question...

When i need to micropolish and when i need to balance the crankshaft? In which situation?
(i dont trust brazillian machine shops)