Buddies Car Backfires in exhuast.... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Rikarus · 08-26-2009, 11:54 AM

SO my friend has a 73 Challenger, 440 engine, 4 speed, he had it restored.....didn’t do the work himself and cant tell me much about the motor except it was built by a racer...(weak I know)

It's a strong 440 and runs like a madman, I went in and played around to make sure the timing is on, or reasonably close as I can guess not knowing cam/compression, etc.

When he lets out it will backfire in the exhaust pipes after it's warmed up. It's like some unburnt a/f mixture is getting in there and when it accumulates enough....BAM!

He is running a carter carburetor, and stock ignition.

I am brainstorming a bit to figure out what would be the cause, timing, ignition system, valve lash, the crappy (I mean Carter) carburetor, any thoughts?

*CamaroSpike23* · 08-26-2009, 12:08 PM

what size carb is he running? vacuum or electric fuel pump? how old are the plugs and wires?

Rikarus · 08-26-2009, 06:50 PM

MEchanical fuel pump, Carter 750 from what I can tell of the P/N, new plugs and wires, first hting I went for was plugs, they don't appear to be fouling.

I am suspecting the stock coil, or the jetting in the carb, but hard to tell.

Rikarus · 08-26-2009, 06:51 PM

oh, and it appears to be right bank only, left bank seems fine.

08-26-2009, 11:54 AM	#1
Rikarus I can't tpye! Drives: 2010 RS/SS Victory Red Join Date: Jun 2009 Location: Denver Posts: 580 View My Garage	Buddies Car Backfires in exhuast.... SO my friend has a 73 Challenger, 440 engine, 4 speed, he had it restored.....didn’t do the work himself and cant tell me much about the motor except it was built by a racer...(weak I know) It's a strong 440 and runs like a madman, I went in and played around to make sure the timing is on, or reasonably close as I can guess not knowing cam/compression, etc. When he lets out it will backfire in the exhaust pipes after it's warmed up. It's like some unburnt a/f mixture is getting in there and when it accumulates enough....BAM! He is running a carter carburetor, and stock ignition. I am brainstorming a bit to figure out what would be the cause, timing, ignition system, valve lash, the crappy (I mean Carter) carburetor, any thoughts?

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08-26-2009, 06:50 PM	#3
Rikarus I can't tpye! Drives: 2010 RS/SS Victory Red Join Date: Jun 2009 Location: Denver Posts: 580 View My Garage	MEchanical fuel pump, Carter 750 from what I can tell of the P/N, new plugs and wires, first hting I went for was plugs, they don't appear to be fouling. I am suspecting the stock coil, or the jetting in the carb, but hard to tell.

08-26-2009, 06:51 PM	#4
Rikarus I can't tpye! Drives: 2010 RS/SS Victory Red Join Date: Jun 2009 Location: Denver Posts: 580 View My Garage	oh, and it appears to be right bank only, left bank seems fine.