[bottlefed55gasser]

Anyone done this before? I got a set of brand new kb silvolites dish pistons laying around the garage, wondering if its worth running on a low boost engine something around 5-7 psi maybe 10ish. cr with the heads sould be in the 8:2something area. I can get a part number later today.

[T-bucket23]

Originally Posted by bottlefed55gasser

Anyone done this before? I got a set of brand new kb silvolites dish pistons laying around the garage, wondering if its worth running on a low boost engine something around 5-7 psi maybe 10ish. cr with the heads sould be in the 8:2something area. I can get a part number later today.

If you want it to live you should run forged pistons. Starting at 8:2 is fairly safe if you keep the boost down. If you detonate them they will break.

[bottlefed55gasser]

Yeah I've heard these pistons tend to shatter pretty easily.

[bottlefed55gasser]

I forgot to mention they are for a 383 stroker.

[F-BIRD'88]

Detonation will bust a forged piston too. It just fails differently.
Most all OEM cars that are turbo charged or supercharged use a cast or hyper piston.

If you hammer on any piston hard enough-long enough it will fail.

The boost is not hard on a piston. Detonation is. A failed piston always means you did something wrong.

Many many sucessfull supercharged-turboed motors have been built and run with KB hypers.

If you try hard enough you will find a way to bust one.

Can you build a turbo motor that won't hammer it self to death?

Are you willing to put decent gas in the tank? there is no free lunch.

[bottlefed55gasser]

Run 93 pump gas, wouldn't mind doing water meth too.

[bottlefed55gasser]

Throw a few gallons of race gas on the weekend mixed with 93.

[bottlefed55gasser]

But the more I can just run on 93 and use a water meth kit the better!

[vinniekq2]

how many turbos? are you planning on 750 plus hp?

[bottlefed55gasser]

Just a single, no more then 500 550. I just want a really fun street car that will run 11's and can drive it anywhere and everywhere.

[F-BIRD'88]

A roots blown motor is a lot more fun.

[spinn]

You can run 5-7 psi on stock cast pistons without worry. 7 is pushing the safe limits. You can do it.

Do not detonate. Play the curve safe.

A roots is the cheapest way possible to get that level of power.

[F-BIRD'88]

The only way you will break a cast piston in a blower motor is either detonation or ring end butting.
Avoid both and they will take a lot of boost.
When combustion is normal its not hard on the piston.

The top ring end gap has to be bigger with a KB piston in a blown motor.
Build and tune the supercharged engine so it does not knock under WOT boost and
the pistons will out live you.

[ap72]

Originally Posted by spinn

You can run 5-7 psi on stock cast pistons without worry. 7 is pushing the safe limits. You can do it.

Do not detonate. Play the curve safe.

A roots is the cheapest way possible to get that level of power.

I'm not sure why you think a roots blower is the cheaepst route, or why Fbird think that they're more fun. There are a LOT of ways to make good power, some cheaper and some more costly.

Nothing wrong with a roots blower but is far from the only show on the block.

[spinn]

To tear apart a engine , get a cam , heads is more expensive. A roots 144 is under $1000. You can easily double the output of a stock 290hp long block.

A good piston , cam, head combo cannot take that pepsi challenge.