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Help! Shooting fire and fouling plugs
Posted: Thu Jun 10, 2021 9:17 am
by lepermime
I'm trying to clean up a 1971 411 and as much as I like being able to blow a 3 foot flame out the exhaust, I'd prefer not fouling plugs every 500 miles.
I put a 1.8L 914 motor in the vehicle and have a Holly 5200 sitting on top of it. I've done a carb rebuild and it idles beautifully, but step on the gas, and I get carbon out the exhaust, and can smell un-burnt fuel.
Re: Help! Shooting fire and fouling plugs
Posted: Thu Jun 10, 2021 11:43 am
by Ol'fogasaurus
lepermime wrote: ↑Thu Jun 10, 2021 9:17 am
I'm trying to clean up a 1971 411 and as much as I like being able to blow a 3 foot flame out the exhaust, I'd prefer not fouling plugs every 500 miles.
I put a 1.8L 914 motor in the vehicle and have a Holly 5200 sitting on top of it. I've done a carb rebuild and it idles beautifully, but step on the gas, and I get carbon out the exhaust, and can smell un-burnt fuel.
Are you talking about the flame throwing thing that was shown in the movie "GREASE"? If so do a search "Exhaust flamethrowers" as the kits are available. An old thing of my time but
not something I would recommend.
Lee
Re: Help! Shooting fire and fouling plugs
Posted: Thu Jun 10, 2021 12:01 pm
by lepermime
Ol'fogasaurus wrote: ↑Thu Jun 10, 2021 11:43 am
Are you talking about the flame throwing thing that was shown in the movie "GREASE"? If so do a search "Exhaust flamethrowers" as the kits are available. An old thing of my time but
not something I would recommend.
Lee
It already does the flamethrower thing due to running rich and I'd like to figure out how to lean it out. After being warmed up, I can rev the engine once or twice and catch a nice flame out the exhaust.
Re: Help! Shooting fire and fouling plugs
Posted: Thu Jun 10, 2021 1:46 pm
by Ol'fogasaurus
There are a lot of things to be looked at if what you are saying is going on. It usually ends up being the muffler collecting raw fuel in it then (maybe) late firing, delayed or miss-firing setting the raw fuel in the muffler on fire.
Carb problems to timing problems, bad plug wires (later firing) or the timing not set right, these are just a few of the "could be" problems. Check the carb for the float setting, the ignition system and timing and the condition of the spark plug wires causing them to be slow in passing the firing sequence to the plugs (I'd check the condition of the plugs too. Look to see if they are heavy black or the proper correct firing color).
Also, are you over carbureted as that can be a problem too.
Sorry I can't help more than this but what you are describing isn't a new but is a very old problem.
Lee