Twin Turbo/ZZ4 question

[Ummgawa]

I was reading on Bank's site that at 6lbs of boost, a ZZ4 krate motor was an ideal candidate for the twin set up. That particular engine, based on my investigation, has Hyperutectic pistons, pinks (or equivalent) steel crank and stock balancer. Am I missing something here? 12 lbs boost requires Forged, billet Yadda Yadda. but 6 requires minimal metals IYKWIM.

Now I understand the concept on Boost and increased cylender pressure, etc and the need for the hi dollar stuff for the 12 lbs. But the 6 lbs? surprises me that one would suggest the lesser set up at all. Seems to me the engine would be mincemeat if you really drilled the motor for any length of time or even all at once. any thoughts?

[camcojb]

Originally Posted by Ummgawa

I was reading on Bank's site that at 6lbs of boost, a ZZ4 krate motor was an ideal candidate for the twin set up. That particular engine, based on my investigation, has Hyperutectic pistons, pinks (or equivalent) steel crank and stock balancer. Am I missing something here? 12 lbs boost requires Forged, billet Yadda Yadda. but 6 requires minimal metals IYKWIM.

Now I understand the concept on Boost and increased cylender pressure, etc and the need for the hi dollar stuff for the 12 lbs. But the 6 lbs? surprises me that one would suggest the lesser set up at all. Seems to me the engine would be mincemeat if you really drilled the motor for any length of time or even all at once. any thoughts?

I would say at that boost level it's all in the tune. If it doesn't detonate it should lead a long and happy life. If it does it has no extra protection that a forged system would have (you never want detonation in any motor, especially forced induction) but you get the point.

Jody

[Ummgawa]

Thanks Jody for the quick answer. Bummer about the paint. Any hopes of makin the tour?

[camcojb]

Originally Posted by Ummgawa

Thanks Jody for the quick answer. Bummer about the paint. Any hopes of makin the tour?

Not in my car! But I'll still be going.

Jody

[hotwheels]

you are right on your thinking, but 6lbs of is pretty safe on pump gas, and actually you can run 8lbs safely. You just need to back off your timing a bit if you hear some pinging........10lbs and over, you should go all forged, which will ensure the motor is strong enough to handle the added pressures..........later, hotwheels

[Steve Chryssos]

Yeah. I'm with Hot Wheels. I've seen pix of your project Jim. The car is way to cool for a ZZ4--even a ZZ4 with a turbo. In this day and age, there are numerous engine builders who have standardized engine packages with quality parts. Call them crate engines if you will, but these standardized packages save you money because the engine builder bought the key components in quantity (as opposed to one off custom engine builds)