How much NOS is too much???

[zthis]

Hey

I have a 350 SBC gm forged crank, eagle rods and forged pistons 350 tranny . I'm setup with a Dual stage Big Shot Nitrous system. I've made one "bad" pass with some issues running a 150210 Shot that was a 10.004 at 135. After solving the issues I went to a 200 of the line switching to 275 Shot while still in 1st gear car hooked awesome BUT the timing system at the track failed and I got no time slip but it felt alot better than a 10.0. So my question is whats the limit of NOS on a motor of this size. I basically want to make a couple of 9 second passes a year and not every weekend.

Curtis

[grumpyvette]

we would need ALOT more info on the motor and drive train combo to make a WILD GUESS!, but as long as the combo was set up with the clearances and lube system, and the rotating assembly and main caps have ARP fasteners, required to run a large dose of nitrous and work with the heat generated, and theres a slightly rich /wet fuel air mix (try to keep it at about 12.4:1-12.5:1, at the LEAN edge under full nitrious)and the timing advance doesnt get you into detonation, Id suspect your 200-250 range will prove to be about the max reasonable range, Ive run a 250 shot on my all forged full roller 383, but its happier with 200hp levels and the rear suspension tends to puke parts less at 200hp levels also, keep in mind stress is cumulative, the harder you stress the parts the lower the expected life span, and that rpm levels exceeding about 4300-4500 ft per minute in piston speed almost always lead to failures of the lower end and the valve train control becomes far more difficult above about 6300rpm in a sbc, and those valve control issues are frequently the root cause of cataclysmic failures

[grumpyvette]

http://www.amazon.com/exec/obidos/ASIN/0931472164/victorylibrary

 

http://victorylibrary.com/mopar/nitrous-tech-c.htm

 

this might help

btw if anyones reading thru the thread and

has a HYDROLIC CAM,

CAST OR HYPEREUTECTIC PISTONS

or stock connecting rods

ID strongly suggest a 100-120hp shot and about 6200rpm is near the practical limits...yeah! we all know a guy who ran a 250 hp shot of nitrious on a stock engine.... but you don,t generally get away with silly stuff for too long

[zthis]

GrummyVette as always the voice of knowledge and reason.....oh well better go to the garage and squat all my 250+HP NOS jets with a hammer before I do something stupid. Thanks I guess