94GreenMachine

Wanting your educated opinions on piston shape for n20. Dome vs Flat vs dish, etc. True Flat vs Flat w/ valve reliefs. what works best, at what hp level or compression ration does it start to become a real issue, etc.

To get more specific for example, how much difference might be seen on a 12:1 forged 355 set up for nitrous with ported stock heads and intake with extra exhaust work and really free flowing x pipe to duals exhaust, with a nitrous optimized cam with about the same specs as a cc306, spraying a 200 shot with a Nitrous Outlet plate system and reving to about 6800?

thanks in advance for your input.

Ray@NitroDaves

I prefer to use round ones.......

On a serious note....I would give the guys at JE, Ross, and Wiseco a call and get there suggestions. For a 200 shot you will need a good piston but it won't take anything super special. I will suggest to tell them you are going to run up to 300 on them and gap the rings accordingly.

jakesz28

Not a special thing for nitrous but I prefer to run a flat top piston with a small chamber to get the compression you want. Having a big dome may slow the burn rate and could cause some detonation. Don't get me wrong people have been running bomed pistons for ever. But with the newr motors going towards flat tops, small chambers, better burn rates, and even lower timing people are doing amazing things with pump gas.

rskrause

Just be sure the dome volume gets the desired CR and the piston has a thick enough crown and a deep enough top ring land. Considerations about hp related to dome shape are real, but the effects are small. Unless you have clean sheet and can optimize everything, don't get spastic about the shape of the crown.

Rich

boosted-lt1

Measured at room temp or operating temp?

In therory... why run a dome if you don't have to get your CR? You want to maximize quench (or at least maintain) and a dome could hurt optimal combustion.

-Scott.