Checked the knowledge section, no help. When I accelerate at any speed I get back-fire.
Suggestions?
Running dual Kadrons on an 1835 w/110 cam.
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Checked the knowledge section, no help. When I accelerate at any speed I get back-fire.
Suggestions?
Running dual Kadrons on an 1835 w/110 cam.
Suggestions?
Running dual Kadrons on an 1835 w/110 cam.
Jeff,
I know nothing about the Kadrons, but generally backfiring through the exhaust is caused by a dramatic lean condition. If the only backfiring you get happens when you first tromp on the throttle, then a likely suspect is an accelerator pump that isn't squirting.
The "squirt" of raw fuel is required to overcome a momentary lean condition caused by a response lag of fuel/air mixture delivery when the throttle suddenly opens. No squirt or inadequate squirt = backfire.
Equally, make sure both carbs are balanced in adjustment with each other. Check for linkage that is worn and sloppy, or way out of wack adjustment.
I know nothing about the Kadrons, but generally backfiring through the exhaust is caused by a dramatic lean condition. If the only backfiring you get happens when you first tromp on the throttle, then a likely suspect is an accelerator pump that isn't squirting.
The "squirt" of raw fuel is required to overcome a momentary lean condition caused by a response lag of fuel/air mixture delivery when the throttle suddenly opens. No squirt or inadequate squirt = backfire.
Equally, make sure both carbs are balanced in adjustment with each other. Check for linkage that is worn and sloppy, or way out of wack adjustment.
Mark has the right idea....If the engine was running properly befor, and has reasonably low total milage, I would check Carb synchronization and linkage wear....Accelerator pump problems will just about bury the front end of my car when encountered...
I Had the same thing with my VS's Kadrons. The trouble was that the intake manifolds were not tight. New gaskets and tightening fixed it.
At one time I gad backfiring when letting off the gas and that was a similar fix---the exhaust manifold was not tight enough. Same fix as above.
I fixed both issues from help from this wonderful site. How great is that?----Jack
At one time I gad backfiring when letting off the gas and that was a similar fix---the exhaust manifold was not tight enough. Same fix as above.
I fixed both issues from help from this wonderful site. How great is that?----Jack
There is a no-brainer possibility, too.
First, check all four plug wires on both ends. If you've run a rag over your engine compartment to clean it lately, you might have bumped the distributor or the case ends of the wires. It happened to me in the Smokeys in October; the car smelled rich, so if lean's the problem, you'll be able to smell the difference. It ONLY happened on acceleration because one whole cylinder's worth of fuel was being pushed into the exhaust pipes and was burning there.
Two, even if the plug wires are connected and the distributor looks and feels good, take the wires off the dizzy and look at the contacts. Two of mine routinely corrode; wire brush them, and the car evens out again.
I've been daily driving for a year with no problems apart from little stuff, so I know my car very well. It might or might not have bearing on your situation. How often do you drive it, and is this abnormal -- or has it been sitting and maybe the weather has acted on the electrical parts?
If it isn't the wires, Jack might have nailed it. Acceleration backfires relate to the intake side, and deceleration backfire seems to stem from the exhaust side sucking cold air into the exhaust manifold.
Lots of stuff to check, but it's going to be easy to run down the list. I'd start with easy.
First, check all four plug wires on both ends. If you've run a rag over your engine compartment to clean it lately, you might have bumped the distributor or the case ends of the wires. It happened to me in the Smokeys in October; the car smelled rich, so if lean's the problem, you'll be able to smell the difference. It ONLY happened on acceleration because one whole cylinder's worth of fuel was being pushed into the exhaust pipes and was burning there.
Two, even if the plug wires are connected and the distributor looks and feels good, take the wires off the dizzy and look at the contacts. Two of mine routinely corrode; wire brush them, and the car evens out again.
I've been daily driving for a year with no problems apart from little stuff, so I know my car very well. It might or might not have bearing on your situation. How often do you drive it, and is this abnormal -- or has it been sitting and maybe the weather has acted on the electrical parts?
If it isn't the wires, Jack might have nailed it. Acceleration backfires relate to the intake side, and deceleration backfire seems to stem from the exhaust side sucking cold air into the exhaust manifold.
Lots of stuff to check, but it's going to be easy to run down the list. I'd start with easy.