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How Nitrous (N2O) Systems Work
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Why its jetted @ Solenoids
Why we cant use Oxygen!
V8 into Ford Sierra!
Car Nitrous Kit (System):
Build your own car Nitrous Injection System (NOS kit!)
Car Nitrous Injection System (NOS
Click image for a bigger view
of my own Rover V8 3500cc installation, in my old Ford
car! This was originally a 1600cc Ford Sierra L 4 door. A
neatly fitted, blueprinted Rover V8 with Nitrous Boost (of course!)
transformed it just a little. Click image for a bigger view.
to hear it start up!
to see how it was done!
You do not need
a V8 to fit Nitrous Oxide Injection. So lets carry on!
Any and ALL engines, from
lawnmowers (been there while testing) and model aircraft engines, up to big diesel
marine engines, supercharged, turbocharged, or naturally
aspirated can all be boosted with Nitrous Oxide quite safely. Fuel
injected, or Carburettor. It makes absolutely no difference. All will
work just fine with Nitrous Oxide as a power booster. Only a
few small differences between each system are required.
For almost any car, you will
the following items...
They are available cheaply in your own locality from various
suppliers with the possible exception of the solenoids valves
themselves. You may need to modify some
simple air solenoids as
shown on the solenoids page. Its easy enough and much cheaper than buying often
inferior purpose built nitrous solenoids. As long as you understand the
1. A bottle or "tank" to store Nitrous Oxide
Specification: Any Vessel
that can safely store Liquid Nitrous Oxide, meaning a
Bottle/Tank with a 3600 approx test pressure or higher used
with a Bottle valve that has a pressure relief valve rated
LOWER than this test pressure at about 1500 to 2000 psi. It does not HAVE to be a
conventional bottle. (For example if you wish to "cheat" you
could fill part of a motorcycle frame, Rear swinging arm, or
under a cars bonnet maybe the "strut brace" could be used for
secret storage) See link above. C02 bottle valves already have a safety blow off
valve. NEVER USE ANY OTHER TYPE OF BOTTLE! Dry powder bottles for example will
explode and kill you. Know what you are doing and read this about 6 times!
Ideals: Aluminium alloy, polished, or anodised, or
painted in two pack epoxy spray paints and mounted using
machined billet bracket, and/or Velcro straps for attractive
and professional appearance. CO2 Fire extinguisher bottles are ideal. Or a
Pub CO2 bottle.
2. A valve for this bottle
Specification: A full
flow, (internal bore 2.5 to 4mm) Bottle valve, usually as used
for a C02 bottle. It must use a Siphon tube internally that
fits into the underside of the valve to draw liquid Nitrous
Oxide from the bottom of the bottle / tank. This Valve MUST
have (for safety reasons) an Over Pressure rupture disk, as
fitted to all C02 bottle valves that you can buy. Try home brew
suppliers, welding supplies, pubs, fire extinguisher reconditioners etc for
supply of these.
Ideals: Small attractive,
chromed or Aluminium alloy Valves preferred for a professional
appearance. Brass ones are common work fine but don't look pretty!
3. A special fitting that fits this bottle valve and converts
to a normal 1/8th BSP thread (British standard
specialised fitting that follows the 2.5 to 4mm internal bore
of the siphon tube/valve and fits the unique Carbon Di-Oxide
(CO2) Valve thread that all these bottle valves use. This reduces the thread
size from the valves big CO2 thread down to 1/8th BSP so we can then attach the Nitrous Line
to the bottle Try home brew suppliers, welding supplies, pubs, fire
extinguisher reconditioners etc for supply of these.
Ideals: Most of the ones we
find or can get easily are brass which goes dull! But, this
can be Chromed, for the sake of appearances as required..
Intermission and warning!
complete "nitrous system" comprising of a CO2 Fire extinguisher
bottle (polished up) , a
couple of plumbers "threaded reducers" in the top bottle thread, and an 1/8th inch "ball" 1/4
turn valve plumbers valve.
It works but don't try this!
This bottle shown isn't safe since its valve does not include a blow off or
rupture disk! In the event of over pressure due to overfilling or heat the
bottle will explode violently! A bottle explosion can easily kill.
Always use a proper valve with blow off or over pressure rupture disk for
safety! Use a proper CO2 valve! I didn't because it looks neat and
I am stupid, and only half filled the bottle very carefully BY WEIGHT and used
it straight away. But its still dangerous! I show this only to show how easy it
is to get things wrong and NOT know its a danger.
Its connected in turn to a length of stainless
steel braided "brake" hose, modified air solenoid to work at 1000
psi plus. And a flexible nylon 4mm tube and
fittings to feed the Nitrous Oxide gas to the engine, with home made "injector"
all shown above.
Not shown is the fuel solenoid/pipes/injector...
All look similar though.
4. A braided Stainless steel Nitrous Pipe to feed the Solenoid
in the engine bay
for all bikes and race vehicles - Normal Braided line. The
same stuff countless racers, and motorcyclists use to swap
onto their vehicles to replace the Rubber brake pipes! Its
actually a P.T.F.E. (a sort of plastic) sleeve inside a woven
stainless steel sheath. It has a 3.7mm internal bore. It can
be expensive, if bought "branded (Goodridge, or Aeroquip for
Example) or cheap if unbranded and bought off a roll by the
meter. Its all the same for our purposes. You will also need
some fittings that are easy to screw onto the ends that go
from "braided" to 1/8th BSP. These fittings have a minimum
2.30 mm internal bore.
Alternatively, and for cheapness, with some advantages for
small power boosts only, and on some road cars, 4mm Nylon, but
you will need the stuff with 1.7mm internal bore preferably. And suitable
fittings with nuts and olives. (not the more common 2.5mm bore
stuff - its not really up to the pressure! and may burst and waste your Nitrous
on a really hot day...
Stainless Braided pipe! With stainless steel fittings
on anything with 40 to 70 BHP extra added or above, and on all bikes.
It looks more professional too.
The argument for
and against 4mm Nylon for feeding Nitrous from the bottle is
quite involved but... Its
should you be interested. Facts only. No
5. A Nitrous Solenoid!
Needs to operate reliably, against up to 1500psi pressure of
liquid Nitrous Oxide gas at only 10 volts DC as this is
sometimes all that's available due to current drain on small
light batteries on race vehicles without charging systems.
It must also flow enough Nitrous for the intended power
increase. The solenoids I modify are actually intended for
compressed air, and after modification will flow +140bhp worth of
Nitrous Oxide. It must not "freeze" open, or leak, and must
operate reliably over thousands of operations. Needs to be
corrosion and vibration "safe" and not leak gas slowly over time.
Should be low current drain, light small physically, easy to
mount, have 1/8th BSP threads on inlet and outlet.
Stainless steel, or anodised aluminium bodies look the
nicest and do not corrode. Magnet wiring and connections
should be waterproof.
6. A Fuel Solenoid!
Needs to operate reliably, against up to 100 psi pressure of
liquid fuel @ only 10 volts DC as this is sometimes all
that's available due to current drain on small light
batteries on race vehicles without charging systems. It must
also flow enough Fuel for the intended power increase. The
solenoids I use here are actually intended for compressed
air. There are many suitable ones, but the seat sealing
material must be tested to make sure it does not harden,
soften, deteriorate, dissolve in everything from pump fuels,
to methanol, and various octane boosters. It must not
"freeze" open, or leak, and must operate reliably over
thousands of operations. Needs to be corrosion and vibration
Ideals: Should be low
current drain, light small physically, easy to mount, have
1/8th BSP threads on inlet and outlet. Stainless
steel, or anodised aluminium bodies look the nicest and do
not corrode. Magnet wiring and connections should be
7. A Tee piece or other means of supplying fuel to the Fuel
Solenoid - depends on vehicle
Any type of tee piece can be used. Some means of tapping into
the fuel pressure side of the Carb(s), or Fuel rail. It must
be along with its fittings and hose clamps capable of the
flow and pressure required for safety reasons.
Stainless braided on fuel injected cars/bikes is safest, used
with threaded tee or adapters. This is not always easily
done, so a normal hose clamp/rubber pipe and barbed tee must
be used. Do this VERY CAREFULLY because if it leaks a
serious fire could result.
8. A Jet Holder for the Nitrous jet. (1/8th BSP to 4mm O/D
Nylon with nut and olive)
Simple metal fitting. Male 1/8th BSP to 4mm nylon pipe -
Compression style. Best not to use "push lock" fittings
here. The 1/8th BSP side needs to be drilled and tapped M5
and recessed to accept a control jet.
Brass, Brass plated with nickel, Brass chromed, or Stainless
steel. Plastic is ok and works but a bit weak... Plastic does have lower thermal
mass which is good!
9. A Jet Holder for the Fuel Jet. (1/8th BSP to 4mm O/D Nylon
with nut and olive)
Simple metal fitting. Exactly the same as the one above. -
Male 1/8th BSP to 4mm nylon pipe - Compression style. Best
not to use "push lock" fittings here. The 1/8th BSP side
needs to be drilled and tapped M5 and recessed to accept a
Brass, Brass plated
with nickel, Brass chromed, or Stainless steel.
10. Some 4mm O/D Nylon pipe to connect the solenoids to the
point of injection
4mm outside diameter. 2.5 internal bore. Available cheaply in big rolls... In
many colours. The normal stuff has approx 2.4 to 2.5mm
inside diameter. It is NOT rated for 1000psi pressures, so
is not really suitable for the connection between bottle and
solenoids, but it WILL actually stand it OK Mostly... It is however IDEAL for
connecting the solenoids outlet to the engine, injectors, or
distribution blocks. These are at much lower pressure
because the control jet is in the solenoids outlet, and the
pipes are "open" at the engine end. And more importantly
they have low thermal mass.
Pretty colours! Low thermal mass and cheap!
11. Nitrous/Fuel Injector - or occasionally more than 1
depending on engine configuration
It must introduce the Nitrous into the engine, and preferably
the fuel as well. It can be two single connections close
together, or a single device that allows both fuel and
Nitrous to enter at the same point. In ALL cases the Nitrous
MUST "collect" the fuel and atomise it finely inside the
port, or air intake system.
Must look pretty, be small, and preferably use nuts and olives
in preference to "push lock" type fittings for reliability.
12. Assorted brackets and mounting hardware, cable ties,
grommets, wiring etc
Difficult. Every vehicle and setup will be different.
Fabricate as required...
Solid, tidy, neat, well thought out.
13. An arming switch
Any switch that looks cool, sits in your cars dashboard, or
somewhere within easy reach on a bike, that allows you to
switch "on" or arm the system ready for use. It must be
reliable, and be able to cope with 5 amps+ and preferably
have some kind of light or other indicator so you don't
forget its on! It should be wired through the ignition, so it only works
while the engine is running. It should preferably only work when you have oil
pressure (engine turning) and it would be advantageous if it was wired via the
oil pressure switch.
Use a "standard" interior switch in your car that uses the
unused switch positions on your dashboard. This way it looks
standard, not obvious?
14. Throttle operated Micro-Switch or other alternative
Use a GOOD QUALITY 5 amp micro switch, and seal against water
with silicon sealant or similar. Mount inside the car so the
throttle pedal operates it at full throttle, or on the carb
/ throttle body instead. This means you only get nitrous at full throttle!