Over - run Backfiring ?
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So Kevin, a little poppity-pop out the tail pipe with a glass pack is OK? Whats your opinion?
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Enjoy the poppity pop but just be aware it comes with risks.
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Non feedback carbs can not adjust the fuel air mix it is fixed with the main jet and the idle air mix adjustment. Even feedback carbs cannot adjust the idle air mix.
When you improve the volumetric efficiency of an engine either by uncorking the exhaust or some other means this allows for more air to enter the cylinders at any given throttle position, adding more air (oxygen) means you need more fuel to keep the same fuel air ratio. If you do not adjust the carb's jetting or Idle air mix (for running on the idle circuit) you will run lean and we all know what happens when you run an engine too lean.
The afterfire on deceleration is a lean condition backfire. It's no different than a lean backfire/ miss at speed or idle. It's funny how people will tolerate an afterfire due to a lean condition and think it does no harm but will go through great lengths to prevent it at idle, under acceleration, or during cruise , cause of the damage it does.
That afterfire on deceleration is your engine screaming at you for more fuel.
#42
Me thinks this thread is a bit blurred. Here we are discussing backfire and after fire in the same context.
I would suspect the valve shown above has been leaking for many miles or hours, burning, eroding a bit more each power stroke of the engine. I have to wonder if this is 19K miles from new or on a rebuild, or what. Either way, that engine had to have been running like crap, the cylinder was essentially dead and had been that way for a long tme. An early valve adjustment may have prevented that carnage.
I was of the impression that with newer technology fuel systems, fuel is pretty much shut off when the vehicle is in the coast or decelerate mode.
I would suspect the valve shown above has been leaking for many miles or hours, burning, eroding a bit more each power stroke of the engine. I have to wonder if this is 19K miles from new or on a rebuild, or what. Either way, that engine had to have been running like crap, the cylinder was essentially dead and had been that way for a long tme. An early valve adjustment may have prevented that carnage.
I was of the impression that with newer technology fuel systems, fuel is pretty much shut off when the vehicle is in the coast or decelerate mode.
#43
Me thinks this thread is a bit blurred. Here we are discussing backfire and after fire in the same context.
I would suspect the valve shown above has been leaking for many miles or hours, burning, eroding a bit more each power stroke of the engine. I have to wonder if this is 19K miles from new or on a rebuild, or what. Either way, that engine had to have been running like crap, the cylinder was essentially dead and had been that way for a long tme. An early valve adjustment may have prevented that carnage.
I was of the impression that with newer technology fuel systems, fuel is pretty much shut off when the vehicle is in the coast or decelerate mode.
I would suspect the valve shown above has been leaking for many miles or hours, burning, eroding a bit more each power stroke of the engine. I have to wonder if this is 19K miles from new or on a rebuild, or what. Either way, that engine had to have been running like crap, the cylinder was essentially dead and had been that way for a long tme. An early valve adjustment may have prevented that carnage.
I was of the impression that with newer technology fuel systems, fuel is pretty much shut off when the vehicle is in the coast or decelerate mode.
#44