hiphop

I have a roller cam 350 bored .040 over with dish pistons. It is also a 2 bolt main. It is completely rebuilt brand new, pistons are hyperutectic (sp) the rods are gm "x" rods, and a gm crank. I am using tbi right now but plan on swapping to tpi soon.

I am curious as to if my motor would hold up to a bottle or not. If it could how much could I safely squeeze without harming my motor. This is my daily driver and I just got it back on the road. Had it off the road for three months building my engine and do not want to hurt it. Any and all help would be apreciative.

Hip hop

bEtUr4dRustang

Hey
Do a search, you'll find everything you need to know and more.

yellow87irocz

yes hypercrap pistons can handle up to 150hp of n2o all day

but i dont recommend spraying a TBI go ahead and get a TPI

Schultzy89GTA

Your 350 should hold up to repeated 150 shots with no problems.

- Make sure that your fuel system is up to the task.
- Make sure that your ignition system is in top working condition - the use of an aftermarket spark box (MSD, Jacobs, etc.) is recommended.
- Spark plugs 1-2 heat ranges cooler than stock.
- Recommended that you retard timing 1-2 degrees per 50hp of nitrous (3-6 degrees - FWIW I always ran full timing with no probs on the L98)
- Do not hit the nitrous at less than 2500-3000 RPM.


Take care of the above and you should be having a good time. Do some research to round out your knowledge on the subject. There are any number of other accessories that will add to the safety and/or performance of your system but you can add as you go. Examples would be fuel pressure safety switch, bottle heater, purge solenoid, window switch.

For the life of me I do not understand the advice of the previous post. Maybe Yellow will elaborate for us?

Also, I just re-read your post... how many miles do you have on the new engine? You want to make sure that the rings are broken in before using the juicy juice.

-Schultzy

yellow87irocz

i hate hypertech pistons i think that they are great for stock motors and that is it

for the money he spent on his hypercraps we could have bought a good set of forged pistons( i spent 550 on rings pistons pins and spirolocs) and they werent a cheap brand

and if we drives it everyday why not go ahead and put the TPI on it because if he leaves it TBI then he will have to change his kit

TBI has 11psi of fuel pressure
whereas TPI has 45psi of fuel pressure

if he wanted to spray his car he should have built a n2o motor not a stock one

raggedout91RS

There is nothing wrong w/ hypers. Better than cast, WAYYY cheaper (but not as strong)than forged . You can put a decent shot on them. I am spraying a stock, cast piston LO3 shortblock w/ a 125hp shot and have had no problems yet. You dont have to build a n2o spec motor just to have a lil extra fun w/ the daily driver.

unknown_host

iTrader: (1)

You can get into Hyp. pistons for under $10 a piece. Show me a forged piston that costs less than $10.

83 Z28 HO

I wonder....hate to steal the post but could a stock l69 motor with only future bolt-ons (full exhaust, carb, intake, distrib+coil etc.) could it take a 50 shot and still be happy? Anymore? It has been sitting for quite a while, but has only 35k miles on it.

PS: IF I did do it, it would be after I did the other stuff so.

yellow87irocz

why would you want hypertechs in the first place

i know that you can get them for around that and have used hypertechs in rebuilds before and my dads car we put 250hp worth of n2o on them and they lasted a whole season

that was in 2 stages though

my point is if you know that you are going to shoot your car and you know that you are going to rebuild the motor you should go ahead and build it so that there are no weak parts

BTW everyone who says that n2o is bad and it will blow your motor is wrong because it works and if properly prepared for it and tuned for it your car(motor and all) you will have no problems

raggedout91RS

Dude, if your dads car took a 250 shot on hypers and everything seemed to work fine w/ no problems then why preach forged? He said it was going to be a daily driver. I doubt he is going to be spraying a shot much bigger than 150 unless he likes living dangerously. Car Craft magazine sprayed a stock cast piston shortblock w/ 100, 200, 300, and a 400hp shot. It finally broke w/ the 400 shot. and they said the main reason was because they hit the spray right off idle. But, I'm not saying that this was a wise thing to do and I would,nt even consider more than a 150 shot on a Daily driver and thay took all the recommended precautions. I'm right there w/ you saying that forged are stronger pistons but the prices sux. Bottom line I think the Hypers would be fine.

88Camaro350

Hypers are fine as long as you do not get detonation. Detonation will kill any piston but hypers cannot take nearly as much as forged can.

I have a 9.6:1 350 with hypers and I was wondering if mine could take a 100 shot?

I have the following for it

- 88gph holley blue pump
- MSD 6AL box with a rpm window switch (plan on spraying 3k-5300)
- fuel pressure safety switch
- WOT, toggle, and rpm activated window switch
-gonna run r43ts plugs and a total of 6 degrees base.

Do you think I will be safe on a 100 shot?

Raiden

The flaw of the hyper pistons are that in detonation, they are very fragile. They are hard and brittle. Strong unless......detonation. Then they are very prone to breaking ....so make sure you run 92or better octane. Keep your timming retarded 1 deg per 75shot of nos, good spark, good fuel source ( 255lhr pump). I put hyper's in my Z that's supercharged and greatly regret not using forged

88Camaro350

My fuel pump provides more flow than a 255lph to. 255lph=67gph...

My holley pump flows 88gph at 9psi.

Raiden

you should be fine. fuel psi safety switch would have saved my vett! I turnned my bottle on adn it ran funny at the light????? I steped onit and boom! warped a head adn burned two valves on the passengers side becasue my nitrous solenoid went bad. my only saving grace was my vett had forged pistons or I probally would have had to replace the pistons too. You shoudl be fine, sounds like you have your "ducks in a row" for the laughing gas

88Camaro350

Thats what I like to hear.

I think I should be fine. I know people running bigger shots than me with no safety stuff....I just don't wanna chance it. Nitrous is not something I will ever rig onto a vehicle.

Raiden

You can run up to a 175 shot and be safe with your set up.

88Camaro350

I'm not going to though. 100 is my limit. I am buying the edelbrock performer system with the 50-100 jets.

I just don't want to push my 1.5 year old gm goodwrench motor to far. I really don't want to replace it again. But if it does go forged internals for sure.

Raiden

YOu will be fine up to 175! I ran 150 on my vett before I rebuilt the engine. The only reason I rebuild the vett was becasue I was getting married and planed on keeping the vett for a long time. Needed to spend the cash before I got married... Anyway, my vet had 70K on it when I started using nos on the engine up to 89K. And it's no like your spraying all of the time, just when need for speed kicks in

88IROC350TPI

You'd be suprised how much nitrous a motor like yours will handle as long as you can tune and are very careful....

http://carcraft.com/techarticles/116_0406_nuke/