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Engine Operation Considerations
When used correctly, nitrous oxide safely elevates cylinder pressures and temperatures while increasing combustion rate.
These characteristics make the engine more sensitive to detonation. To ensure proper performance and engine life, the
following tips are suggested:
Adequate Fuel Pressure and Delivery:
When designing your fuel system, plan on your pumps and lines flowing at least 0.1 gallons per hour per horsepower at
rated pressure. The testing at Edelbrock was conducted with a fuel pressure of 6.5 psi. Any variation from this fuel pressure
will cause your final air/fuel ratio to change. Consult our technical department for any questions on fuel pressure and its
effects on final air/fuel ratios when using nitrous oxide. Edelbrock recommends setting your fuel pressure flowing. We offer
a flow tool (Edelbrock Part #76506) to help in this process.
Fuel Quality:
Because nitrous oxide is an oxidizer, fuel selection is critical. Both octane and fuel consistency affect fuel burn rate. The
oxidizer quality of nitrous oxide will accelerate the burn rate, so we recommend a high quality type of gasoline. We also
recommend you use the same grade of gasoline every time you use your nitrous oxide system. This will maintain the same
fuel burn rate every time. Please refer to the jet map footnotes for information on what fuel types and fuel qualities that were
used during the testing here at Edelbrock.
Engine System Upgrades:
With all performance modifications complementary system upgrades will always serve to elevate the consistency and
longevity of an engine, especially when using nitrous oxide as a power adder. Ignition upgrades, intake manifold upgrades,
and fuel controls and fuel pumps can all add to the performance of a nitrous oxide injected engine.
Cast Pistons/Hypereutectic Pistons:
With all nitrous oxide applications, forged pistons are highly recommended. Because of heightened potential for detonation,
cast pistons and hypereutectic pistons are more prone to failure and cannot handle horsepower increases over 125 hp.
Never initiate your nitrous system before you are at full-load, wide-open throttle conditions. Cast pistons will not be able to
survive this kind of stress.
Catalog #70011, #70012
Rev. 07/08 - AJ/mc
Page 2 of 5
©2008 Edelbrock Corporation
Brochure No. 63-70011
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