How much do you think Mahle pistons can hold up to when it comes to spray, anyone have experiance with Mahle? I would like to sqeeze a 300shot on the383, 6"rod, 10.5cr

 

I was told no more than a 200hp shot but my stock piston could handle 200hp so I'm pretty sure I can handle a 200-250 shot.

 

what about SRP? These are the pistons that come in most rotating assembilies thats why i wonder.

 

"Mahle" is a brand. They make a wide range of cast and forged pistons, including the stock LT1 hypereutectic pistons. Whether a specific piston is suitable for a particular level of nitrous will depend as much on what its made out of, and how its made, not just on which manufacturer made it.

 

Why would anyone consider hypereutectis pistons when using N20?? I didn't know Mahle made dif pistons. I couldn't find much info on them, only that they are forged.

 

stockers are mahle" its just a brand i believe.

 

Correct, I'm running forged Mahle's now as well.

 

We primarily deal with Diamond pistons, but there are many other quality manufacturers like Mahle, JE, and Ross to choose from. In the application you are describing I would recommend stepping up for any manufacturers “shelf” stock pistons to something specific for your build. If you are interested please feel free to contact me and we can discuss having Diamond build you a set of pistons that will stand up to the amount of abuse you plan on throwing at them.

 

I was told by JE themselves (they make SRP) that SRP pistons are not meant for nitrous applications because of their high silicone content.

Frank

 

Don't they make low silicone SRP pistons? Pretty sure they do.

I talked to a guy at JE about their pistons and he recommended the SRP for a turbo'd application making around 900hp. Maybe there is some reaction between silicone and nitrous in the combustion chamber?

 

No reaction between silicone and nitrous. The more silicone (e.g. hypereutectic), the more brittle the piston, the more likely it will crack when the engine detonates. Simple as that.

 

Most SRP's are forged, high silicon #4032 alloy. They are more likely to stand up to nitrous than a stock piston, but are not designed with nitrous use in mind. Large dome SRP 's are made of low silicon #2618 aluminum and are tougher, though none of the designs are marketed as "nitrous specific" slugs.

Most street or street/strip cars runing "small" (~150-200hp) nitrous shots don't need the heavy duty features of a nitrous piston but will benefit from the tougher alloy of a premium #2618 piston in terms of potential for longevity with repeated nitrous use. A piston designed to stand up to large amounts of nitrous is going to be heavier than a standard high performance piston. The crown will be thicker, there will be reinforcement of the pin boss, a thicker top ring land, etc. A beefier wrist pin may be used. If you want a setup for a 300hp shot, you need a nitrous piston, IMHO. You also need a good setup/tune. Besides avoiding detonation and having appropriate timing, the thing that will kill a motor with that much nitrous is bringing it on at too low an rpm. A large nitrous shot at low rpm generate excessive cylinder pressure and that will stress even the best parts excessively.

Rich

 

I never new that about srp forged pistons, good info. 300 shot is what i will try, when i get some JE or diamond nitrous series pistons