zazzn

Hi All,

I know the VVTI rods are weak, and generally the first thing to fail when boosting a GE VVTI. However, I also see ALOT of guys getting blow by when boosting a GE-VVTI is there a problem here, I had planned on just adding rods and keeping the high compression on my GE VVTI block when I boosted her. Are the pistons a problem or just the rings, I know there is no oil squirters and the usual things but I just wnated to know if I can get away with rods only. My goal is maxing out a 6266 or MAX 67/70 on e85 so around 800-900 MAX generally will hover around 600 for most times.

gerrb

iTrader: (34)

replace both GE VVTi rods and pistons

beyond 450 rwhp OR ft.lbs of torque you are on borrowed times. The rods are weak and the pistons / rings couldn't take a lot of heat . Those pistons by the way are 10.5:1 in compression.

zazzn

So are the pistons actually weak, or is it just the ring lands? I don't have crazy goals, and realistically, I'd just change the rings and rods. Goals are within the stock turbo GTE pistons and rods would normally be able to take.

gerrb

iTrader: (34)

It is not the rings that are weaker , it is the ring lands of the pistons . So the pistons are weaker. They crack .

zazzn

Gotcha, how do the NA (nonVVTI) fare? I'm not quite sure if I want to do a full engine build yet.

lexforlife

iTrader: (7)

Na non vvti pistons are as durable as GTE lower compression pistons inclusive of ringlands. In fact made of exactly the same material.