How must NOS can you SAFELY run without having problems with these pistons?????

there is no real answer to this question..
it more of how much detination can these pistons
with stand..or cylinder temps...
ive run as much as an .80 no2 jet with kb hypers
mostly .63 no2 with a proper tune..
and lately snuck a .73 jet in ( about 50 passes so far)
ive been told my et is prolly at the limit..
?
i had some detination lift the top of a piston
ive had a poor tune fat with too much timing melt a piston and cyl wall. both with a .63 jet pill.
but when its tuned right...it just takes all of this...same motor since 04..(sans the two repairs mention'd)
i dont know what hp level these jets are..but .63 it is usually around a second faster...
the .80 jet wasnt a full pass but the 60ft was .03 faster than a .63 pass and the 330 was .023 faster before i lifted..(it just felt funny)
the .73 jet ET is .2 faster and 3mph faster then the .63 pill..fwiw.
all 1/8th mile times
cheapst

for reference..
here is an excellent comparison of how much a .63 no2 jet makes..
this is my car in right lane with .63 jet green duster
vrs
a car in the left lane blue dustert hat runs an identical time as my car when its n/a
so figuratively speaking this is my car racing itself side by side with and without nitrous..
(hope this makes sense)
so you can see the difference


http://www.youtube.com/watch?v=I1ZoE-WiQhs

pay SPECIAL attention to ring gap with them.

Hey Cheap.....Nice run!!!!!! How much HP of NOS did you have on that run??

Randy....What if you dont know the ring gap???

very wide gap for NOS or you will pull the tops off the pistons, years ago all the chevy guys where doing that and didn't know why, gap has to be around .080 on the top ring, really depends on the piston maker.

Normal ring gap is .004" per inch of bore. I used .010" per inch on mine and never butted a ring. I sprayed 150 for many passes and never broke anything.

If your tune-up is right everything will live. If it's wrong, it doesn't matter what kind of pistons you have, you'll kill them.

I aint tearing it apart so I guess no NOS for me.

IF and thats a BIG IF I put it on,would only be 150hp anyway.

the expansion rate with a Hyper is a LOT more than a cast or forged, thats why a larger gap is NEEDED, not because the alloy is weaker.

I ran my 340 with stock bottom but forged replacement pistons, had no idea what the ring gap was. Monte gave me some tune ups. Biggest thing was to pull timing and get fuel pressure and bottle pressure right. Ran 150 tune up and went from 12.90 @ 105 to a 12.1 @ 113. I even pulled couple more degrees of timing out to make sure it stayed together. My drag radials would not hold from start line, so i hit the bottle just past the 60 foot mark. It did increase my trap rpm from 6000 to 6600.

I sprayed those pistons up to 250 never had a problem with the smaller shot

I had a 178 runs and countless street miles on that motor before it lifted the tops off 2 of those pistons. when I got greedy and started hitting it with 250

If you stay with the smaller jetting and the motor is in good shape it should last a long time with a good tune up

Here is a pic of my experience with Hyper piston. 150 hp shot, there was to much damage to be sure what realy happened.

I wasnt planning on doing it till after I had it to the track and fine tuned it but now that everyone is tell me " NO WAY!!!",I wont be doing it.. Maybe ill just have to put a BB in it!!!