on a stock motor that will hold up. 50-75?

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1966 Plymouth Valiant, 225, 3 on the tree, 8 1/4 3.21 sure grip, hyperpac, holley 650dp, holset h1c

If the engine is in good condition, 50-to 75 horse shot should not be a problem.
I've put that much an many stock Slants... "wakes them up" good.
DD

yeah the motor runs like a top. i have a backup in case anything happens. if a 75 shot wakes it up would a 100-125 shot make it scream? would it hold it?

thats a crazy little setup you got there. i was gonna run a base plate system, i have the offy 4bbl and 2 1/2 exhaust on it if that makes a difference.

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1966 Plymouth Valiant, 225, 3 on the tree, 8 1/4 3.21 sure grip, hyperpac, holley 650dp, holset h1c

As you move past 75 HP of N2O, pay special attention to the fuel system and the ignition system.

At higher HP shots, a dedicated fuel system with an adjustable regulator and a pressure gauge is needed.
I have found that a top quality ignition set-up is also needed or else you get mis-fire with lot's of spray.
DD

ok, thank you. ill just run the 75 and see what happens

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1966 Plymouth Valiant, 225, 3 on the tree, 8 1/4 3.21 sure grip, hyperpac, holley 650dp, holset h1c

Doc, interesting picture and setup! Have you documented that anywhere?
Thanks!
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Jeep honcho history

Not much to it, most everything is shown in the photo.
Note that I have a 3rd 'nos only' nozzle mounted in-board, between the inner manifold mounting bolt hole and the carb base opening. That nozzle sprays a small shot of pure NO2 right into the incoming A/F mix coming through the 1BBL carb.

The only trick, making sure you clear the carb. & linkage with the fogger nozzles and pointing the spray paths so you get good mixing with the incoming A/F.

I am very pleased with how this systems works, the distribution is great and it took 3 seconds off my stock SL6. (from mid 18's to mid 15's on the spray)
DD

75 shot should be good i put a 100shot on my old motor and that motor was running 9.6's in the 1/8 without the nos so it got fun with the bottle on.

Kev

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I have cast pistons in my dart, and use an offy 4 barrel, and edelbrock 600 carb. A 50 shot took my car (3300lb street car) down from 14.8 to a 14.0 without any tuning, I basically just cut the timing back. I think you might be surprised what it will do. Especially once you tune your engine for the 75 shot. Problem is we always want more. I will most likely be spraying much more this year, but I will also be using an egt sensor and air/fuel ratio meter to try to make sure it doesn't go lean with the higher hp. I had the opportunity to run with Charlie S. on a test and tune night last year, and i got to see his car go from a 17.?? to mid 13's using 125 shot on a 170 engine. I was very surprised.

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Ryan Covalt
62 Plymouth Valiant Race Car 2170# 11.008 @ 117.65 MPH 1/4 Mile Best
72' Dart Swinger Street Car, 4 spd, 3330# 14.061 @96.58 1/4 mile Best

Keep adding 25hp until engine blows.

Install new engine and go back to shot size that didn't blow engine............

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Nahw, just pull some piston out of the old spare engine in the corner, install with new gaskets, done. About $30

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

That was the first time that car had been to the track in 2 years. The engine is a totally stock short block, just a cam and bolt-on's, with the nitrous. Don't run too much timing, and don't go lean.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

I run low 8's in the eighth mile with 100 shot, .435 lift cam, and the clifford setup

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The surgeon general never said that smoking the competition was bad for your health.

i guess i could do that

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1966 Plymouth Valiant, 225, 3 on the tree, 8 1/4 3.21 sure grip, hyperpac, holley 650dp, holset h1c

I've run as high as a 150 shot on hyperteutectic pistons that everyone said you could not spray. They were fine.

175 shot with a fuel rich tune-up was not fine.

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Official Cookie and Mater Tormentor.