nitrous with hypereutectic pistons in SBC?

[flames4me]

my question is how much nitrous do you think i can put on hyperneumatic pistons? right now before the nitrous it has around 400hp on a .30 bored over 350.

one more question to add. i have this motor in a pontiac Fiero (sideways mounted engine) i can already get the front tires off the ground without nitrous, and am expecting to run high 11s in the quarter mile before nitrous. i have a dual plane manifold, with hard acceleration, will there be an uneven flow of nitrous to one side of the engine if i use a plate system? and which plate would you recomend for my situation? thank you in advance.

[hammered54]

not a whole lot! hypereutectic piston's have more silicone in them to make them more durable but there still cast piston's! they will shatter like glass if you go into mass detination, stick with under 150hp, I used them in a 383 sbc for 2 year's at that level and only bent the pin's, if you do use them have the pin bore's opened a little extra( on the rod too if your float the pin's) and keep a eye on the timing, and use a ring the will hold a little more heat,and give the end gap's about .001per 1in. of bore more than stock, with the intake have the center divider mill'ed down about 1 in. that will help a lot till you get a single plane. stick with a power shot or somthing like it .

[flames4me]

the pistons are already in the engine, i cant do anything to the pins to make them stronger, the engine rebuild has about 1000 miles on it. would a colder or hotter spark plug help at all with detination and heat distribution?

[hammered54]

yes !! 1 or 2 step's colder will help for sure, also about 2deg less timing per 50hp to start, autolite racing plug 133 would be a good one to start with,watch for bluing on the strap, plug should look like you just put them in after first pass if everything is right, use good gas 100+ and watch that timing, also keep an eye on water temp don't let it run hot you should be o.k.

[mrr23]

i put 150 to my cast pistons in my old 86TA i had. even did a 200 shot once. fuel pump couldn't keep up.

[flames4me]

are hypereutechtic pistons stronger for nitrous than stock cast pistons? with more silicone added to the hyper's, im not sure which one would be stronger.

and, all i can get ahold of as far as 100+octane is the leaded stuff the drag strip sells, with this effect anything with the nitrous? (sticky fuel solenoid, not the correct air/fuel mixture or anything?) i dont have any catalitic convertores to plug up

ps, whoever changed my title to the right spelling, thanks. i know i messed up the spelling of it pretty bad

[mrr23]

are hypereutechtic pistons stronger for nitrous than stock cast pistons? with more silicone added to the hyper's, im not sure which one would be stronger.

the hyperuetectic are the stronger of the two.

and, all i can get ahold of as far as 100+octane is the leaded stuff the drag strip sells, with this effect anything with the nitrous? (sticky fuel solenoid, not the correct air/fuel mixture or anything?) i dont have any catalitic convertores to plug up

unless you are running rediculously high compression (12:1), i don't see a need for 100 octane. i never did. my compression was just at the 10:1 mark.

ps, whoever changed my title to the right spelling, thanks. i know i messed up the spelling of it pretty bad

you are welcome.

[flames4me]

wow, i gotta learn how to brteak up quotes like that, thank you for answering them so quick.

the only reason i asked about the 100+octane was because of hammered54's last post. i think he just meant just in case of a lean mixture 100+ will have less chance of detination than 93. either way, i am probably going to get a 5 gal fuel cell for the track or just for the nitrous system. (dont think a stock 4-cyl fiero f. pump will handle 750 carb with 1XX shot of nitrous) and i dont want to mess anything up in the fuel delivery system.

[hammered54]

Hey flames4me, the hypereutechic (don't make me spell that again) piston's are stronger than cast, you could stand a tank on them, it's the fact that they tent to shatter rather than just crack or break like cast,also not sure where you live but many gas station's here in Michigan have 100 unleaded or 110 leaded in the summer month's, don't think you said what your c/r was or what rpm your going thru the trap's at it would help, but the higher the octane the better as far as pump gas go's , also nos make's an additive that will make 93 a little higher, but all that said you need to keep your eye on that timing!! and fuel pressure that's where your go'na get hurt if it start's to rattle and you go lean

[quicktruck]

my question is how much nitrous do you think i can put on hyperneumatic pistons? right now before the nitrous it has around 400hp on a .30 bored over 350.

one more question to add. i have this motor in a pontiac Fiero (sideways mounted engine) i can already get the front tires off the ground without nitrous, and am expecting to run high 11s in the quarter mile before nitrous. i have a dual plane manifold, with hard acceleration, will there be an uneven flow of nitrous to one side of the engine if i use a plate system? and which plate would you recomend for my situation? thank you in advance.

Use zex perimeter plate system. it works great on a dual plane and is good up to 300hp.

[flames4me]

Use zex perimeter plate system. it works great on a dual plane and is good up to 300hp.

thanks for the info, when i looked it up i got quite the sticker shock though... $430 before shipping, ouch. i guess if it comes down to it ill either need that or take off the manifold and mill the center down 1in like hammered stated.

http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Product_Code=82072&Store_Code=ZX

[quicktruck]

you can get the whole system for slightly more than that. I think I payed around 500 for the system, blow down tube and gauge shipped from Atlantic Speed.

http://cgi.ebay.com/ebaymotors/ZEX-82040-4-Barrel-Perimeter-Plate-Nitrous-System_W0QQcmdZViewItemQQcategoryZ33740QQihZ020QQi temZ300078703585QQrdZ1QQsspagenameZWDVW

[flames4me]

wow, thats real cheap compared to the price of the plate alone... too bad i already have everything exept the plate (bottle warmer, 2 bottles, purge, guages, etc). how much do you think i could sell that kit for without the plate? i do have a spare NOS fogger nozzle i could include to make it a complete kit.

[quicktruck]

wow, thats real cheap compared to the price of the plate alone... too bad i already have everything exept the plate (bottle warmer, 2 bottles, purge, guages, etc). how much do you think i could sell that kit for without the plate? i do have a spare NOS fogger nozzle i could include to make it a complete kit.


make it a kit and post it up on eBay. Sell one bottle separate. The bottles are selling for around $100 each on eBay. I would keep the warmer and purge though. Not really sure how much you would make off everything but I am guessing it would be close.

[hammered54]

I'd keep both bottle's , it's alway's nice to have a spare bottle warm and waiting back at the pit, you can buy a new plate for about $100.00 new w/jet's and stainless line's from jeg's, sound's like you got everything else what'ya wait'in for get to work!! by the way what is the compression ratio? and don't forget a good fuel reg.

[quicktruck]

I would recommend a progressive controller also. I am using one with hypereutectic pistons and it works great. The nitrous comes in easy so there is no hit on the motor. I am using the Cold Fusion controller. It is basic but works great.
http://www.coldfusionnitrous.com/electronics.aspx?CategoryID=18