Over the years, we've printed quite a few stories in ST covering the addition of nitrous oxide to sport trucks. In nearly every case, the engine was stock, and the hit of N2O was a small, safe one. That's cool, but what happens when you want to throw a larger shot of laughing gas at your engine? Is it safe? Can you repeatedly feed your engine 200, 300, or more extra horsepower without melting pistons and blowing the air cleaner through the hood of your truck? The answer is yes! There is a catch though: If you want it to live longer than a few seconds after you hit the fun button, then you're gonna have to build your engine a bit differently than you would otherwise. You're also going to be spot-on when tuning your engine.



Injecting more than a 100 horsepower shot of nitrous into an engine requires the engine to be built to handle the extra cylinder pressure and heat that will be produced. So where do you start? The build tips presented here apply to any forced-induction application, including supercharged or turbocharged engines, as well as a nitrous engine. Follow along as we turn the Big Block From Hell into a guinea pig for large-dose N2O testing. Next month, we'll address the various ways to tune your engine for safe and reliable nitrous operation.

Part One: The Bottom End

Part Two: The Valvetrain

CAM SPECS
INTAKE EXHAUST
LOBE LIFT .516 .498
DURATION @ .05 277 285
LOBE SEPARATION 116.0 116.0
GROSS VALVE LIFT .877 .846

Part Three: The Nitrous System

Part Four: The Ignition
The last piece of the puzzle is a high-tech ignition system that we bought from Summit Racing designed specifically for using N2O. The MSD 7531 programmable Digital 7 ignition system features MSD's world-famous capacitive discharge ignition, but that's not the cool part. The cool part is that this ignition will automatically retard the ignition timing of the engine whenever the nitrous button is activated. It will also ramp the extra timing back into the engine at a programmable rate after the button is released. This allows any extra nitrous to be spent from the cylinders before the timing is back to full advance. You bracket racers out there will love that you can also program this ignition system to turn the nitrous on and off at a specific time or rpm for repeatable runs. Combine those features with the 7531's data-logging capability, and you've got a box that will do it all for years to come.

The Final Word
We've rebuilt the Big Block From Hell to be a bulletproof nitrous-swilling monster. The tips and tricks we learned along the way will help you build or rebuild your own engine into a stout nitrous machine. Next month, we'll take a look at the various methods for tuning your engine to get the most out of it and to make it last.

SOURCE
Proform Parts
www.proformparts.com
Induction Solutions
4000 Crum Rd.
Brooksville
FL  34604
8-15/-341-8853
www.induction-solutions.com
Nitrous Oxide Systems
2970 Airway Ave.
Costa Mesa
CA  92626
Lunati
4770 Lamar Ave.
Memphis
TN  38181
901-365-0950
www.lunaticamshafts.com
Brodix
301 Maple P.O. Box 1347
Mena
AR  71953
COMP Cams
CP Pistons
Irvine
CA
949-567-9000
www.cppistons.com
MSD Ignition
El Paso
TX
9-15/-857-5200
msdignition.com
Pro Filer
www.profilerperformance.com
Nitrous Supply
www.nitrousupply.com
Akerly and Childs
www.akerlychilds.com
Quick Fuel Technology
Bowling Green
KY
2-70/-793-0900
quickfueltechnology.com
Calico Coatings
Denver
NC
704-483-2202
www.calicocoatings.com
Jesel Valvetrain Innovation
1985 Cedarbridge Ave.
Lakewood
NJ  08701
7-32/-901-1800
www.jesel.com
Paul Pfaff Racing Engines
www.pfaffengines.com
Moroso
Guilford
CT
2-03/-453-6571
www.moroso.com
Cometic Gaskets
4-40/-354-0777
Summit Racing
P.O. Box 909
Akron
OH  44309-0909
800-230-3030
www.summitracing.com
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