how does nitrous cause detonation ??

leathal injection · 10-01-2004, 04:16 PM

How does nitrous cause detonation ?

i can understand u need to add more fuel when u spray, cause of the added oxygen in the combustion and for cooling purposes...

but whats happening inside the engine that makes it so u have to take the timming down when u spray nitrous?

~The Jester~ · 10-02-2004, 07:06 AM

Keep in mind that we're talking NANOSECONDS here, but when you add more air/fuel, it actually takes longer to burn. Therefore, you have to start the fire sooner.

This is a super-simplified explanation, there's more to it than this. But in a nutshell, there ya go.

5pointohboy! · 10-03-2004, 11:42 PM

Nitrous causes detonation because of heat.

Detanation is the forced expolsion of the air and fuel mixture before it was intended. The early explosion puts downforce on the piston while the crankshaft and rod are still pushing the piston up. In exteme cases, you can have bent rods, shattered pistons, or even a busted crank.

When you add Nitrous into the picture, you are packing more air and more fuel into the same cylinder (s). More fuel = more power=more heat.

If you ever watch a dyno pull of a motor on "the gas" you will see the EGT's jump anywhere between 100 and 300 degrees when the juice is added! That heat is absorbed (and stored) by the cylinder walls, the heads, the spark plugs, and everything else in there. By retarding the timing, you are giving all the components more time to disperse the heat before the next cycle begins.

Also, when the nitrous comes into play, the motor does not need as much timing to make power. Lets just say that the 10-15 HP you lost by retarding the timing is more than outweighed by the 150hp shot of juice.

10-01-2004, 04:16 PM	#1
leathal injection Registered Member Join Date: Mar 2004 Location: Long Island Posts: 58	how does nitrous cause detonation ?? How does nitrous cause detonation ? i can understand u need to add more fuel when u spray, cause of the added oxygen in the combustion and for cooling purposes... but whats happening inside the engine that makes it so u have to take the timming down when u spray nitrous? __________________ 1990 Mustang GT Engine- 308 (bored .40 over) Probe Forged pistons (10.5:1), Scat forged crank and rods, w/Main Girdle, AFR 185 heads, GT-40 intake, CSI electric water pump. AC delete kit, No smog pump, Manual rack and pinion steering. Ignition- MSD 6AL, MSD Blaster coil, MSD hellicore wires. Drive Train- Tremic 3550, Alum. Drive shaft, 3:73 gears, Stock carrier and axels. 26X11.5 M/T Et streets. Power adder- 175 shot of laughing gas. Best ET 11.5 @120mph on squeeze, 12.4 @109mph on muscle (on gt40 heads) on the 185 heads ... ??? tba

10-02-2004, 07:06 AM	#2
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Keep in mind that we're talking NANOSECONDS here, but when you add more air/fuel, it actually takes longer to burn. Therefore, you have to start the fire sooner. This is a super-simplified explanation, there's more to it than this. But in a nutshell, there ya go. __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
nitrous users please read!	Simi Stang	Windsor Power	12	12-19-2002 02:51 PM
Aftercooler Solve Detonation Problems?	SleeperGT	Modular Madness	9	12-07-2002 07:13 PM
Comments on this Nitrous System	93boss	Windsor Power	3	03-20-2002 05:19 PM
WOO HOO! RAN NITROUS AT TRACK! (long, real long)	bark3rd	Modular Madness	26	08-20-2001 08:05 AM
I need a crash course in NITROUS ED	Dark_5.0	Windsor Power	7	07-12-2001 06:03 PM

10-03-2004, 11:42 PM	#3
5pointohboy! Registered Member Join Date: Sep 2004 Location: Lake Havasu City, AZ Posts: 11	Nitrous causes detonation because of heat. Detanation is the forced expolsion of the air and fuel mixture before it was intended. The early explosion puts downforce on the piston while the crankshaft and rod are still pushing the piston up. In exteme cases, you can have bent rods, shattered pistons, or even a busted crank. When you add Nitrous into the picture, you are packing more air and more fuel into the same cylinder (s). More fuel = more power=more heat. If you ever watch a dyno pull of a motor on "the gas" you will see the EGT's jump anywhere between 100 and 300 degrees when the juice is added! That heat is absorbed (and stored) by the cylinder walls, the heads, the spark plugs, and everything else in there. By retarding the timing, you are giving all the components more time to disperse the heat before the next cycle begins. Also, when the nitrous comes into play, the motor does not need as much timing to make power. Lets just say that the 10-15 HP you lost by retarding the timing is more than outweighed by the 150hp shot of juice.