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Old 07-13-2004, 03:53   #1 (permalink)
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what pistons for an N2O clevo?

with the engine that i am in the process of building i am considering running a small shot of N20. the engine will be a 351 clevo with 302 heads, so basically i want to know what type of pistons i will need to use, will i need to use forged, hyperueretics or can i get away with something less serious.
i would not be using anything over 120hp shot of N20, i will be using standard 351 rods with ARP rod bolts

what else do i need to know about n2o?
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Old 07-13-2004, 04:08   #2 (permalink)
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Re: what pistons for an N2O clevo?

Keith Black had a whole page of tech on running their Hyper pistons on NoS - but only with small shots. If you are going big - use forged pistons and use 1200 wet and dry on the sharper edges (where the piston top meets the skirt). For the ultimate setup do this with forged pistons and then get jethot/hpc high temp coating (engine internal) done on the crowns.
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Old 07-13-2004, 04:15   #3 (permalink)
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Re: what pistons for an N2O clevo?

how big is a big shot? like i said i only want to use around 100hp shot is that excessive?
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Old 07-13-2004, 04:40   #4 (permalink)
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Re: what pistons for an N2O clevo?

Forged Pistons are only an insurance if you intend on seeing high combustion pressures due to blowers and the like..or if its intended on being raced everyday
Personally a GOOD set of hypers will be fine, and spend the $$ left over elsewhere..
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Old 07-13-2004, 04:41   #5 (permalink)
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Re: what pistons for an N2O clevo?

Nos also tends to make things run abit dry, so an upper cyl lube would be a handy piece of equipment.
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Old 07-13-2004, 04:47   #6 (permalink)
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Re: what pistons for an N2O clevo?

run dry how? whats an upper cylinder lubricant thing? what is it? how does it do it?
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Old 07-13-2004, 07:42   #7 (permalink)
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Re: what pistons for an N2O clevo?

Talk to the guys at www.vpw.com.au get the best piston you can afford then get assembly ballanced...
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Old 07-13-2004, 17:00   #8 (permalink)
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Re: what pistons for an N2O clevo?

Run Forgies. done.

From all reports I've seen, hypers are ok with SMALL amounts of gas, but anything over 100HP is touch and go. I personally have run gas on cast & hypers but if you are building an engine why not go for that little bit better.

svo347: does nitrous raise your cylinder combustion pressures?

What end result are you after? pyscho machine or sleeper or racer or??

Don't worry about an upper cylinder lube. Just run a wet nitrous system, and tune it properly. It will be fine, and if you run the nitrous often, your engine will be very clean inside. remember to change your engine oil often also.

Most upper cylinder lube kits are oil based, and so can be a disaster with nitrous. Also the backfireing chance of nitrous scares me with a lube kit.

Give me a few more pointers on what you actually want in the end and I'll add my suggestions.
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Old 07-13-2004, 22:33   #9 (permalink)
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Re: what pistons for an N2O clevo?

Yes..
Generally normal air holds 20% oxygen.
Nos is equivelent to 40%. More bang for the same volume
So i am led to believe......
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Old 07-13-2004, 23:07   #10 (permalink)
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Re: what pistons for an N2O clevo?

Quote:
Originally Posted by svo347
Yes..
Generally normal air holds 20% oxygen.
Nos is equivelent to 40%. More bang for the same volume
So i am led to believe......
Sorry svo347,

I'm aware of what nitrous is made up of, and your are pretty much right.

But I directed the question because you said in your first reply that you would only need forgies if combustion pressures were raised.

That is what nitrous does.

Not being picky, just didn't want to confuse Ron.
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