carbon-like exhaust

[azmichael1]

My '48 P-15 looks good and runs pretty good but the exhaust is damp and carbon-like when first starting up......have checked the owners manual for carb adjustment,etc.......but still have the same problem.....anyone here have any suggestions on how to remedy this ?

Happy Motoring !

Mike

[Plymouthy Adams]

has the car been out on a solid long distance run? oft times this is needed to cleanse the exhaust after correcting a bad state of tune or as we all know if only frequent short trips, the temp never gets high enough to burn out the excess during choke-onrunning/enriched starts.

[tjustice]

Mine is the same way ... I drive it daily, @ 25 miles to work. Not sure but I think it may be related to the cold weather. My temp gauge want reach 160 unless the ambient is at least 45 to 50 degrees. I'm considering going to hotter spark plug.

[azmichael1]

Thanks to everyone for your input.......what spark plugs would you recommend for hotter spark ?

Thanks

Mike

[Don Coatney]

My car does the same. It is condensation developing in the exhaust system.

Hotter spark plugs will not fix this issue.

A 180 degree thermostat will cause the engine to heat up faster and eliminate some of the crankcase condensation. But you will still have the exhaust system condensation. and it will be higher depending on the dew point in the area where you live.

[Robert Horne]

I seen on my truck, that the muffler has a small hole at the bottom rear end to let out moisture that will build up in the muffler and make the bottom half rust very fast from the inside. I plan on doing this to my Coupe if and when I put a muffler on it.

[tjustice]

Thanks Don ... what you say makes sense. No real mystery just the nature of thebeast. I'll be installing a radio soon so I will need to install a resitor type plug but will not worry about adjusting the heat range.

My car does the same. It is condensation developing in the exhaust system.

Hotter spark plugs will not fix this issue.

A 180 degree thermostat will cause the engine to heat up faster and eliminate some of the crankcase condensation. But you will still have the exhaust system condensation. and it will be higher depending on the dew point in the area where you live.

[aero3113]

I was told you can slowly pour water down the carb at high idle to "steam clean" the head and internals to get rid of a lot of carbon buildup .

[Don Coatney]

I was told you can slowly pour water down the carb at high idle to "steam clean" the head and internals to get rid of a lot of carbon buildup .

That is very true and I do so when I feel the urge. But it will not do anything to reduce condensation.

[Don Coatney]

Here is the deal on hotter spark plugs.