Reply With QuoteWell is it back fireing through the carb or exhaust ????
Jim
We were talking about this today and while we all had ideas what happens, none of us could actually explain why and how an engine backfires.....
Please help me look smart tomorrow when I can explain it. :boxed: :boxed: :boxed:
Well is it back fireing through the carb or exhaust ????
Jim
Simple. Exhaust backfire is firing the cylinder with the exhaust valve open. Intake backfire is firing the cylinder with the intake valve open.
Trick is...you gotta find out why it's doing that 'cause it ain't supposed to.
Simple. Exhaust backfire is firing the cylinder with the exhaust valve open. Intake backfire is firing the cylinder with the intake valve open.
Trick is...you gotta find out why it's doing that 'cause it ain't supposed to.
For fun times, go ahead and switch just two cylinders on your buddies BBC. Make sure they are not companion cylinders. See how long it takes him to figure out what's wrong.
*If you do this at night, it will shoot fire out the exhaust. Bring marshmallows.
Yep the combustion pushes out the exhaust instead on the piston.
I hate it when that happens.
In aviation terms, backfire is out the carb and after fire is out the exhaust.
Ok, those are what allows it, however what causes it can vary. Some times it can be caused by carbon tracking in the distributor cap which send spark to a cylinder which is on a stroke other than the power stroke . Also, carbon in the cylinder that remains hot enough to light the incoming air fuel mixture can cause a backfire. Afterfire or backfire through the exhaust can be caused , or rather is usually caused by an exhaust leak allowing oxygen to enter the exhaust stream which re ignites unburned fuel in the exhaust which is hot enough to fire but lacks the oxygen to do so. This usually occurs on older carburated vehicles. In short, many different things can cause a "backfire" condition, these are only a few.
... backfire is out the carb and after fire is out the exhaust.
Ahhhh... smoldering Cessna's.
Anyone know the proper procedure for a carburator fire??
Ahhhh... smoldering Cessna's.
Anyone know the proper procedure for a carburator fire??
Yes sir. Shut fuel selector off, and continue to turn over motor....
Yes sir. Shut fuel selector off, and continue to turn over motor....
Well, almost. Mixture to idle cut off and continue cranking with throttle open.
If it backfired and then started, run the engine up to 2000 rpm for a minute before shutting down to inspect the carnage.
Halon
When the fires out..put on injection.
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