How does running lean cause Nitrous Backfire?
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From: Huntington Beach, CA
How does running lean cause Nitrous Backfire? Hi, first post here: I know this probably has been covered before, but after doing some research, I'm still kinda iffy on this subject. I've read things about the fuel falling out of the nitrous/air mixture in wet systems and puddling in the intake manifold, running rich, cranking the motor over after having nitrous being injected, backfiring when hitting redline, which makes sense. However, I've read things saying running lean could cause a backfire. Could someone explain how running lean could cause a nitrous backfire? Thanks in advance, Kyle
1. Hitting the rev limiter on the spray with no window switch (cuts fuel off). 2. Too much timing. 3. Pic below is from a lean condition all from a loose fuel solenoid wire using a cheap wire connector:
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[/QUOTE] Thread Starter
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From: Huntington Beach, CA
The plug begins glowing constantly from being so hot. Then it preignites the cylinder before the compression stroke is over. Basically it lights the cylinder to early and tries to drive the piston downwards while it's traveling upwards. This is what beats the bearings out of them.
Thread Starter
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Joined: Apr 2014
Posts: 5
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From: Huntington Beach, CA
The plug begins glowing constantly from being so hot. Then it preignites the cylinder before the compression stroke is over. Basically it lights the cylinder to early and tries to drive the piston downwards while it's traveling upwards. This is what beats the bearings out of them.
, I was talking about the detonation of the nitrous (yes, I know nitrous isn't flammable by itself, the explosions just need oxygen for the reaction of fire to work). I'm not talking about knocking. How does the lean condition of the engine cause an explosion once the nitrous is introduced? If the engine is running lean, and you add an oxygen rich mixture into the engine, then it will just run even leaner and hotter, and how does that cause the nitrous to backfire out of the intake? Thanks Trending Topics
There are a couple things that come to mind for me in that scenario. But, this is my best guess:
Very lean mixtures are very easy to ignite and burn much faster. Since the intake valve is open at the same time as the exhaust valve for a very small amount of time just before the intake stroke, a very lean fuel mixture's flame front could actually travel fast enough to outpace the intake charge velocity and travel back into the intake tract igniting the over-lean air fuel charge in the intake. With nitrous in the equation, this would be exaggerated.
Very lean mixtures are very easy to ignite and burn much faster. Since the intake valve is open at the same time as the exhaust valve for a very small amount of time just before the intake stroke, a very lean fuel mixture's flame front could actually travel fast enough to outpace the intake charge velocity and travel back into the intake tract igniting the over-lean air fuel charge in the intake. With nitrous in the equation, this would be exaggerated.
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Verdad Gallardo There are a couple things that come to mind for me in that scenario. But, this is my best guess:
Very lean mixtures are very easy to ignite and burn much faster. Since the intake valve is open at the same time as the exhaust valve for a very small amount of time just before the intake stroke, a very lean fuel mixture's flame front could actually travel fast enough to outpace the intake charge velocity and travel back into the intake tract igniting the over-lean air fuel charge in the intake. With nitrous in the equation, this would be exaggerated.
Very lean mixtures are very easy to ignite and burn much faster. Since the intake valve is open at the same time as the exhaust valve for a very small amount of time just before the intake stroke, a very lean fuel mixture's flame front could actually travel fast enough to outpace the intake charge velocity and travel back into the intake tract igniting the over-lean air fuel charge in the intake. With nitrous in the equation, this would be exaggerated.
Thread Starter
Registered User
Joined: Apr 2014
Posts: 5
Likes: 0
From: Huntington Beach, CA
There are a couple things that come to mind for me in that scenario. But, this is my best guess:
Very lean mixtures are very easy to ignite and burn much faster. Since the intake valve is open at the same time as the exhaust valve for a very small amount of time just before the intake stroke, a very lean fuel mixture's flame front could actually travel fast enough to outpace the intake charge velocity and travel back into the intake tract igniting the over-lean air fuel charge in the intake. With nitrous in the equation, this would be exaggerated.
Very lean mixtures are very easy to ignite and burn much faster. Since the intake valve is open at the same time as the exhaust valve for a very small amount of time just before the intake stroke, a very lean fuel mixture's flame front could actually travel fast enough to outpace the intake charge velocity and travel back into the intake tract igniting the over-lean air fuel charge in the intake. With nitrous in the equation, this would be exaggerated.
