Ghostx3

iTrader: (1)

I'm doing engine rebuild I'm on the process off buying pistons now for all the experience guys what you think on the compression. Which would work better for daily driver. I wanna keep stock rods. And I'm just going for around 500whp

Wiseco K398X05 -3cc 4.005 with stock ls3 heads I'm looking around 10.3 compression
another piston the I was looking at will be. +9 wiseco 4.030 it will come out at 11.3 compression

I wanna do a 150 nitrous shot


Any help will be appreciated. Thanks.

ATwelveSec02Z28

iTrader: (17)

i wouldn't worry so much about compression.... There are other factors way more important such as ring package and placement, alloy, and overall design.


You want a lowered first ring land, good alloy, a smoothed piston top. Gas porting is great as it will help ring seal.....


Compression can be handled through cam design to make it tolerable

Bowtiedford

iTrader: (9)

all the info posted above. I've liked a flat top style piston for a better burn area or should say quench area.

87silverbullet

iTrader: (11)

With just a 150 shot, I don't think much of that is really going to matter. With that said, I'd shoot for the 11.3:1 compression piston.

ATwelveSec02Z28

iTrader: (17)

I will politely disagree with this....

all of the things I mentioned will make the engine more efficient on nitrous.

Static compression ratio is pretty ranging too.... you can get vastly different nitrous characteristics all based on dynamic compression.

87silverbullet

iTrader: (11)

On more nitrous, i would agree. On a 150 shot you will not seeva noticeable improvement.

99FRC

iTrader: (5)

yeah, but who builds a forged motor and stays on a 150 shot? Better to build the motor right for a larger shot later.

1970camaroRS

iTrader: (8)

Exactly, because you know that's what's going to happen. 150 worked good...why not 200...250...300...

Bowtiedford

iTrader: (9)

I'm going forged once I start going pass 300

ZONES89RS

iTrader: (25)

And if you want 600 HP+, throw some dome pistons from summit in there. 11.5:1 with a cam and square ports? As long as the intake is decent that’s easy 600 HP

ovaboost

iTrader: (4)

Do 10.3 or 10.5 so your tuning window isn't small 11.1 and up you'll want race gas mixed with pump for detonation reasons

grubinski

I’ll beat GAtma to it … this thread is 6 years old 🙂

G Atsma

Too late, TWO guys responded.... it's on a roll now.... LOL