[KBuva06]

what type of chopper is it
is your tail # 166M3???

[Richardsperry]

Originally Posted by Supered Ehm

engine work too (i.e. thicker headgasket, rods, rings)




It's even worse with ZKWs...

Nope stock internals.

Makes no difference what headlight you have. The aftercooler is behind the sc head.

[Supered ///M]

Originally Posted by Richardsperry

Nope stock internals.

Makes no difference what headlight you have. The aftercooler is behind the sc head.

So you're saying you can safely run more than 5-6 psi on stock internals??? That would make me very uneasy. I know two people (one who turboed and one who s/c) and were pushing between 10-15 psi and both ended up blowing their engines (one the headgasket and the other bent a rod).

[Richardsperry]

It's pretty safe up to 9 psi (that's what I'm running, 3.33" sc pulley, 38#/hr injectors, 3.5" hfm, Aquamist 1S, and a AA tune.) With a good tune and alcohol/water injection. They blew out a hg because they were boosting more than 9. 10-15 is just stupid.

[Supered ///M]

Originally Posted by Richardsperry

It's pretty safe up to 9 psi (that's what I'm running, 3.33" sc pulley, 38#/hr injectors, 3.5" hfm, Aquamist 1S, and a AA tune.) With a good tune and alcohol/water injection. They blew out a hg because they were boosting more than 9. 10-15 is just stupid.

what kind rwhp do you put down with that setup?

[Richardsperry]

Just over 300 on a DynoDynamics. Probably about 320 on a Dynojet.

[Mad Dog 20/20]

Originally Posted by Supered Ehm

So you're saying you can safely run more than 5-6 psi on stock internals??? That would make me very uneasy. I know two people (one who turboed and one who s/c) and were pushing between 10-15 psi and both ended up blowing their engines (one the headgasket and the other bent a rod).

With a centri SC, you can easily run 10-12 psi (370-425 whp) on OE HG and internals - IF you are charge-cooled and running a proper tune. 10-12 psi is pretty much standard issue for your basic charge-cooled stage 2 SC kit.

The rods are generally good up to at least 550 wheel.

[Supered ///M]

Originally Posted by Mad Dog 20/20

With a centri SC, you can easily run 10-12 psi (370-425 whp) on OE HG and internals - IF you are charge-cooled and running a proper tune. 10-12 psi is pretty much standard issue for your basic charge-cooled stage 2 SC kit.

The rods are generally good up to at least 550 wheel.

Wow didn't know that...so I could run a stage 2 setup without having to do engine work?

[pbonsalb]

AA sells stage II supercharger kits running 12-13 psi for use with the stock headgasket. The centrifugal supercharger makes very little midrange boost so the cylinder pressure is not so dangerous. With a stage II turbo, all 12-13 psi would be there in the midrange so a thicker HG to reduce compression (or lower CR pistons) is used. As stated above, people have used stock rods in 600 rwhp engines making over 500 lbs rwtq.

[pbonsalb]

Originally Posted by Supered Ehm

engine work too (i.e. thicker headgasket, rods, rings)

I used a 0.098 HG to reduce CR from 10.5:1 to about 9.8:1. Again, stock pistons, rings and rods are find. I have since changed to a turbo for more power. I changed the HG from the 0.098 to a 0.140 to drop CR to about 8.9:1 for the turbo since full boost will arrive by 4000 rpm instead of only at redline with the centrifugal supercharger.