Nitrous on a 318.....how much will it take

-
LXguy

LXguy

Well-Known Member
Joined
Jul 23, 2008
Messages
2,302
Reaction score
109
Location
Champaign IL
OK, anyone ever sprayed 100 shot on a stock 318 shortblock?

Its in a 72 Satellite if that means anything.

Thanks!

Steve
 
That will get you up to about 220HP. You could probably hit it with a 250 shot.
 
Hot Rod magazine did this maybe 15 -16 years ago with a 318 Duster,kept feeding it until the 318 blew.I believe it went over a 300 shot. This was a clapped out,beat,318. It may be in their archives.
 
Yeah, I've whacked a stock 318 with a 150 shot while running 6PSI of boost from a B&M 174 blower.
A 200 shot stalled the rotors as the serpentine belt slipped, resulting in zero PSI but the car still pulled hard from the N2O.
Head gaskets are the weakest link..... lol
Many runs on boost and spray, never broke due to N2O, excessive RPM's (8,000+) and hydrolock (head gasket) is what did me in.
 
GO for it. I did a stock 318 with 275 before. It didn't break it. Keep the timing back and make sure there's enough fuel pressure with the solenoid open (free flow test).
 
There are some oddball things we find out that no one hardly even believes it's possible.
Way back when these cars were fairly new (as in the late 60's early 70's) my Dad told me you couldn't blow up a stock 318 if it was in decent condition in the first place.
He put his foot to the floor in park, and revved the piss out of that 318 until the valves floated and wouldn't scream any faster and held it there for 5 or so seconds.
He also taught me about valve float that day.:D
 
moper said:
GO for it. I did a stock 318 with 275 before. It didn't break it. Keep the timing back and make sure there's enough fuel pressure with the solenoid open (free flow test).
Click to expand...
How many times did you spray it with 275?
 
This was back in '89. I had a '74 Barracuda 318/3sp I swapped in a 340/4sp with a Cheater plate. Then I broke some ring lands when I ran out of gas in a bad spot and a nice lady let me take her old, low octane lawnmower gasoline. I had to drive out of a steep valley to reach a gas station... I had a street race that weekend so I put the 340 top end parts on and into the 318 stock bottom end, painted it blue, and stuck it back in with the 4sp. Same tune, same everything else. The car was ultimately totaled 6 months later in a wreck caused by a drunk teenager (not me...) and the engine was still in it at that time. In fact, only one guy knew I had hurt the 340, and the 318 kept the winning streak of that car alive. With it's 340 heads (gasp) and Thermoquad (double gasp)...
Nitrous likes big combustion space and controlled combustion. So low compression, short stroke engines will do well with it if the hard parts can hold it. I also know of a 307 Olds in a big GM sedan that has 250hp on it. It's about knowing what you have, and what you're doing. I still have a baggie with bits of those rings and lands that hangs above a work bench as a reminder of being overly aggressive on a street car.
The same guy that struggles with driveability issues and tuning probably shouldn't be just bolting on nitrous. Especially bigger hits as "your results my vary"...lol.
 
moper said:
The same guy that struggles with driveability issues and tuning probably shouldn't be just bolting on nitrous. Especially bigger hits as "your results my vary"...lol.
Click to expand...

??? If this is directed at me I have no idea what you're talking about.
 
A ferfegneugen LOT. One of the hot rod rags did a story on a total junkyard 360. They literally snatched it out of a junk yard, threw a four barrel on it, headers, got it running and TRIED to blow it up with nitrous. They never did. I think they ended up with a 300 shot in it. It kept runnin outta valve spring. LOL
 
After posting this, I bought some old back issues of Hot Rod. February and March of 98. They did a story called Bottle Bomb where they put a bunch of nitrous to a 318 they pulled out of a yard. They blew it up after several 150 shot passes, but they were doing it clown shoes. projected nose plugs, no progressive controller, no rpm switch, lots of timing, stock converter.
 
I'm sure it been discuss before but what all would I need to put a 100 shot to my 360 would a stock file pump work ? Also what about stock distributor
 
Back4morpar said:
I'm sure it been discuss before but what all would I need to put a 100 shot to my 360 would a stock file pump work ? Also what about stock distributor
Click to expand...

Pull the timing back to 34 total. 2 degress for every 50 hp NO2
 
Back in the 80's I put a 125 hp plate on a stock (except for a LD4B manifold and a 4bbl holley from a 440) 74 dart. Over 100,000 miles on it, 904 trans, 2.93 pegleg 7 1/4 rear. opened the single exhaust pipe just before the muffler, and put on a set of 8x22x13 M&H slicks. First time ever playing with nitrous. Took it to the track,made one baseline pass on motor, ran around a high 15 or low 16 sec. Turned on the nitrous, and hit the button right after the high gear shift (left it in drive), not impressed. Next pass tried hitting it at the 2nd gear shift, felt better. Next pass, just as my right foot hit the floor, off the line, hit the button, what a difference. Ran a 13.8
This was my wifes street car, and only time at the track, but kept the nitrous on the car for 4 years. Only took it off, when we gave the car to her niece.
 
We had a scamp with a mild 318 (carb, intake, exhaust), and a 150 shot. Was a junkyard motor we got on trade, we beat the living snot out of it and it lasted us 3 years on a questionable bottom end (never opened it up).
 
72 Satellite eh? Make sure it's pointed straight down the track, and has lots of shut-down area. Easy 350/400/450 HP, enough to break everything factory behind it when it hits, and to get you more speed than the factory suspension,steering,tires or brakes, can handle .
On the flipside, this is a great way to get a well-sorted 318 streeter into the low 13s.
What's that B weigh? maybe 3800 race weight? well just 380 would get you a P/W of 10/1 and that goes 107/108 which is 12.4 in a SuperStock chassis. Add about .5 for a street chassis and another .5 for a lousy 60ft, so that totals 13.4.
But that's with a NA engine for starters. The boosted engine is gonna make a lot more average power, so if you can get the power on early, you might be tickling 12s. Make sure the rest of the car is up to it.
 
You must log in or register to reply here.
-

Back
Top