I've recently rebuilt my '71 small block buick (350). I've put forged pistons in (10:1). I'm curious if anyone has any experiance with how much N20 is safe on these blocks. I really dont want to invest in another rebuild any time soon! James
I've never heard of anyone putting nitrous on a 350. They are fairly robust motors, but I can't give a good assessment because I've never tried it. Honestly, I would not exceed a 125HP boost, even with forged pistons. And that assumes you do your fuel system right and back the timing off appropriately. If you go to 150HP, I would recommend using race fuel. Then you should learn how to read spark plugs, and make sure that you aren't lean. Do all that, and you'll love to learn nitrous! It's a kick. -Bob Cunningham bobc@gnttype.org
Nitrous on my 350 James, I have a 350 like yours; .30 over forged pistons 10.5-1 later model polished rods ported heads TA intake 800cfm qjet Poston headers GS118 cam Puts out 376hp .. 391tq Planning on a 100 to 175 shot of juice I'll let you know asap after I start the tuning ... David
Re: Nitrous on my 350 Nice motor David, I guess your installing a electric fuel pump, and bypassing the mechanical one? I'd be interested in how it goes for you. I'm about a month away from getting the spray, I need to get the new trans in the car first though.
Fuel pump Was planning on running an elec. pump in back pushing through the mechanical up front ... DO you know something about the mechanical pump I should avoid? Thanks, David
Just my thought on this- because the mechanical pump pumps in "pulses", I didn't like the idea of letting it supply my system. That will work fine for a carb because it has a bowl, but I'd be worried that I would go rich-lean-rich-lean-rich-lean when injecting from the mechanical pump. (I also wanted a very big shot, requiring more fuel than the mech. pump could supply) -Bob Cunningham
nitrous on 350 run 150 shot on my old 355 with 10.50 to 1 compression pistons & .040 off the heads if i could have gottin good traction i might have seen 12.00 instead of 13.01@103.98 in the 1/4 mile with a 1972 buick with all interior in peter
Those were my thoughts exactly. Although I dont really want anything about 100 shot. I'd rather be on the safe side, thats all.
James, I know there are a couple of guys on the board that have sprayed their 350's pretty good! Suprised they haven't chimed in yet.ou: You could probably run a little more nitrous if you're using a progressive controller such as Jacob's Electronics Nitrous Mastermind. Bringing the nitrous in slowly should be 'easier' on parts than an 'all at once' hit!:TU: The Jacob's unit also has a proper type of rev limiter in it - cuts out the nitrous before it starts cutting out cylinders!! That way you don't get excess nitrous filling in a cylinder that isn't firing. BAD things would happen otherwise!! I think these 350 blocks are stronger than many of us realize! *Did you use new rod bolts when you rebuilt your engine? Just make sure that your ignition system and fuel system is 'bulletproof'! If you get heavy detonation on the bottle - you may be a new member of the 'drive over the crank' club!:eek2:
Nitrous? Hmmmmmm..... Make sure to run a fuel regulator at least on the nitrous side They don't recommend spraying over 150 hp on a dual plane intakes due to fuel distribution problem unless you want to put a sportsman Fogger adjustable from 100-300. Always run a fuel safety cutoff switch. Since your starting out on almost the smallest nitrous shot there is, hit it all at once as soon as the light turns green or your wasting you time. Your car wont turn into some ungodly monster on the 125 shot it will just feel nice and strong. Make sure to do a "system Check" before you actually try the nitrous on a running motor. A "bad" fuel solenoid is a bad thing to find on a running motor. FLYIN' oN tHE JUICE!!!:stmad: :stmad: :stmad:
Thanks for all the tips. I think I'm going to do my HEI conversion before I move to the Jucie. As the motor approaches 6k I feel a little missfire. From all the things I've read, missfiring (or knocking) on the juice is a bad thing. Well my car is off to Level Ten this weekend for a tranny rebuild and new converter. Wish me luck. James
I ran through a few bottles on a 125HP Plate kit. The engine was a stock bottom end 100K mile 1968 350" engine in excellent shape. You guys are right about the ignition, because points just wouldn't fire it. With an HEI, watch out! Lots of fun. I had an AC mechanical fuel pump and Sunoco Ultra 94 octane. Trigger switch on the carb. Q jet carb and plate. No problems at all, exept when I still had points and backfired through the carb and warped my air cleaner lid!
I think a 350 could take a 150 shot easy. ricers annd other small engines run fine on 100shot. I think the need for stronger parts come in when your a bad tuner, hehehe it much easier on a FI engine than a carb but still effective. Id through a 150 shot on my wagon without fear. now on my 2.8v6 I would not run more than 100 shot. I know a guy with a 100 shot on a 3.4v6 and has run it for 3-4 years. Anyone seen much about running NOS and propane injetion??? Seen on trucks that added 245Hp by using both in a dodge. All they said was make sure your tranny can handle the power. I guess popane is like NOS but real safe and no worries about detenation.
A buick engine with Nitrous??? now ive herd them all. I would put a blower on a buick but nitrous....nah Whats the point a buick engine doesnt need any nitrous. Stick to all throtle no bottle. Besides like I always say bottles are for baby's. If you really want more power why dont you just rebuild a 455? Me personally Im not a fan of nitrous unless my car was purely a dragster. But what do I know?
Adam H., Nitrous is a nice option for those of us who drive our Buicks daily. It's certainly possible to make the HP levels I do without nitrous, but I get 13 - 14 mpg daily, and 18 mpg on the highway. That's just too much to ask of a 750HP NA motor. If your Buick is pretty much driven for race only, or on weekends / cruising, then you have more flexibility on how you make your HP (open headers, race fuel, Stage III heads, .650" cam, whatever). But I still think that Nitrous is a nice option for race cars, too... Nitrous is definately very rare in the Buick community, and frequently shunned, but if we all did things the same way that would be quite boring... -Bob Cunningham bobc@gnttype.org
Nitrous is awesome! My dad runs a 100 shot on his '64 Riviera. It has a 425 with 2-4bls, 4000 s/p converter and a ford 9" rear with Detroit locker and 4.10's. I took this picture a few years ago but it is lifting the front tires off of the ground about 4". This is a full weight car and even has the front sway bar on it. If you are going to run NOS make sure you run a dedicated fuel system for it. He uses 2 pickups out of the tank with 2 electric pumps and 2 regulators. One supplys fuel to the motor and one to the NOS plates when it is armed. He has ran it like this for a few years with no problems. In this pass it ran 12.8 with a 1.66 short time! Ken
