How much nitros can my engine take?

jerry S · Oct 25, 2006

How much nitrous can my engine take?

My 351W was recently rebuilt. My crank is stock and was rebalanced and reinstalled with new main bearings, caps, and bolts. I have forged I beam rods and forged flat top pistons. My CR is 11:1.

I want a dual stage shot of nitrous with a progressive controller. How much can the engine safely take? I was thinking about 100 shot for stage I and 150 shot for stage II to be safe.

351carlo · Oct 25, 2006

If the block is stock, and does not have a half fill of hard blok or any reinforcements, I would be first concerned with the cylinder walls cracking.

That being said, I would go with a 200 shot total or less, preferably just a 150 shot. This is where I feel comfortable, and I have a very similar setup with a Cleveland block.

Make sure you pull timing, have your setup tuned in right, use a hobbs switch, I like the use of a window switch, WOT switch is a definite, and I would use some higher octane fuel with 11:1 compression.

In fact, most setups with compression as high as yours and a street motor I've seen the guys run 2 fuel systems. Standard motor setup, and a secondary fuel cell with dedicated pump for the nitrous system. Use premium gas for the motor, and then fill the nitrous tank with high octane race fuel.

mustangman70 · Oct 25, 2006

Helli used a secondary pump just for my 100 shot lol

However we need more info man, what else is the engine containing? heads cam etc...

How about your exhaust, with a dual stage i would defiitly open up the exhaust a little more, maybe give those heads a nitrous port job....

Also what are you using for ignition and fuel currently?

Theres a couple of us nitrous junkies in here and i personally wouldent go over 250 myself so i think you might be allright, it just depends how much power were looking at allready N/A

jerry S · Oct 25, 2006

mustangman70 said:
Helli used a secondary pump just for my 100 shot lol

However we need more info man, what else is the engine containing? heads cam etc...

How about your exhaust, with a dual stage i would defiitly open up the exhaust a little more, maybe give those heads a nitrous port job....

Also what are you using for ignition and fuel currently?

click on the "About my car" link under my sig to see what I have done to the car.

In a nut shell, I have an MSD pro-billet dizzy, 6AL box, and digital timing computer. Fuel is 94 octane. Exhaust is through long tube headers and 2.5 inch tubes with X-pipe. Heads are Edelbrock RPM Performers and will be ported. Here are the post porting flow numbers

Intake/Exhaust .100" 79/61
Intake/Exhaust .200" 145/121
Intake/Exhaust .300" 198/168
Intake/Exhaust .400" 241/178
Intake/Exhaust .500" 279/196
Intake/Exhaust .600" 284/205

cam is

ADV DUR: INT 297, EXH 308
- LIFT: INT 538, EXH 534
- DURATION AT .50 DEGREES: INT 236, EXH 242

rear gears are 3.70

I can even use a dedicated fuel pump for the nitrous. I have an electric holley blue for gas and still have a new stock replacement fuel pump on the engine just sitting there doing nothing. I can dedicate that for NOS.

I am currently at 400-415 NA right now (before the heads are ported).

I want to spray only as much as is safe for the engine.

iskwezm · Oct 25, 2006

backed when i worked at NOS, we wouldnt recommend anything more then a 150 shot on "stock"(pistons,rods,crank) internals. A block is a small part of the equation, but the internals will take the abuse first. I have ran up to 140 shot on my stck 94' gmc truck and ran 150 shot on a stock 96 cobra. I think 125 is plenty and 150 will scare you.

mustangman70 · Oct 25, 2006

If your at 400 or so horsepower allready.... i think a 175 shot will do the trick

iskwezm...do you think that "stock replacement" pump on the block will be sufficiant enough for him to run a dual stage system?

jerry S · Oct 25, 2006

mustangman70 said:
If your at 400 or so horsepower allready.... i think a 175 shot will do the trick

iskwezm...do you think that "stock replacement" pump on the block will be sufficiant enough for him to run a dual stage system?

What he said.

The only thing stock on my internals is my crank. How much juice can my engine take? Can I use my stock replacement pump in conjunction with my holley blue to run a dual stage?

Inquiring minds want to know.

mustangman70 · Oct 25, 2006

It would "take" a 250 shot no problem....the fun part would be waiting to see how long that stock block can handle 650+ hp or TQ

Ive been under the impression that the stock pump would be fine for about a 100 shot, i may be wrong, but im a little parynoid when it comes to the juice and just to be safe i would throw a little upgraded holley or edelbrock mechanical for the spray, and of course use a pressure saftey switch!!!

iskwezm · Oct 25, 2006

mustangman70 said:
If your at 400 or so horsepower allready.... i think a 175 shot will do the trick

iskwezm...do you think that "stock replacement" pump on the block will be sufficiant enough for him to run a dual stage system?

I ran mine with a Holley Blue up to 150 shot and newver had a lean problem. As long as the pump can sustain the needed psi, it should be fine, if it bleeds off under a load,then theres a problem.

use the block pump and kick on the Blue for the second stage if you like

10secgoal · Oct 25, 2006

I wouldn't go above 150-175. Try a super power shot, and a jacobs mastermind. Look into the description of it online. Wonderful little toy.

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