Pistons?

[64falconsix]

I am still in the planning stages of the motor that will replace the tri-power after I get some paint on the 64. The current plan is a 200 ,9 to 9.5 to 1 compression, C.I. alumunum head and a 50 or 75 HP shot of N2O. givin a this basic combo and a 5200 to 5400 rpm max redline would cast pistons hold up? This will be a street engine with an occasional 1/8 th mile run or short burst on the backroads. This is my weekend cruiser which I occasionally drive 100 or more mile on a weekend to shows or cruisins. I have read that Mike has been looking into getting some Hypers made at a very good price but all research I have done has been conflicting, I have seen a lot of bad press on the keith black hypers being stronger but more brittle than cast and having less thermal transfer effieciantcey which causes failure with boost. can anyone shed light on the differences between cast and hyper in terms of strength , resistence to detonation , longevity with higher rpm and N2o. I was trying to stay away from forged so I can run a closer skirt clearance for ring control and longevity since I want this engine to last.

 

[First Fox]

I would feel safe running stock replacement pistons in this application. If your tuning skills are up to snuff, and can prevent it from leaning out you should be good. Forged pistons will give a bit more of a cushion before getting hurt from a lean out, but even they will melt down if your tune is way off of course and are not worth the extra money in my opinion.

Detonation on the other hand will kill them all, and the hypereutectics are even more vulnerable than stock casting in this regard as they are quite brittle.

I am personally a fan of using stock components and good tuning techniques to keep things safe and sound. Look what Linc did before his stock pistons gave up the ghost, I believe he had to lean it out at 20 psi before he broke a ring land. That's good enough for me.

 

[rbohm]

8) i was a fan of hypereutectic pistons until i talked to ross pistons. they are the ones that hipped me to the fact that indeed hypereutectic pistons are more brittle than eutectic cast pistons, even though the extra silicon makes them in some ways stronger. the downside is that they are also harder to machine.

and as indicated, if your tuning skills are up to snuff, and you can avoid detonation, for your application good quality cast pistons will do just fine.

i will say this, if you plan to use the nitrous a lot, then go with a forged piston for added safety.

 

[64falconsix]

Thanks guys, I was kind of thinking that just needed confirmation. Nitrous express site says 100 hp is the limit for a 6 cylinder engine with stock components so I figured I would be safe and use a 50 or 75 hp jetting as the max for a little extra kick now and then.