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.

 

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.

 

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.

 

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

 

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

 

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