My 27 Touring has been acting bad for a while. No matter how lean the nh is,I'm fouling plugs pretty bad. 3 different sets,modern champion 25 or X type, it doesn't matter. None are new plugs,but all restored,by glass beading.This car does NOT have a magneto which I know would help with hotter spark.My battery is 4-5 years old, could it not be providing a hot enough spark? The car starts fine,I believe coils and timing are good,but will check that
Carbon tracking in the coil box ?
Possible,Bob. But when I made the box I was familiar with carbon problems so I made box of solid maple.
Here are some ideas.
Mixture needle in carb grooved allowing too much gas no matter the setting.
Vacuum leak causing mixture to richened to compensate.
Timing too advanced causing too cool temperature.
You didn't mention a dripping carb, so I am assuming that the float needle is not leaking.
That's all I can think of this early in the morning.
Mike, you left out an important detail.
Are you using a Vaporizer or NH Carb?
If you have a NH Carb, do you have the pipe assembly installed that brings warm air from the exhaust manifold to prevent frost from the Venturi Effect?
Hey James, you did not read well the original post, he stated that he was runnig an nh carb.
Best
Gus
What plug gap are you running? If you're at .025", try opening it up to .030" or .032".
A lot of people claim .025" is the best, but our car will carbon up and run terrible at that gap, runs much much better at .032" gap.
Nike,
Three thoughts:
Are you using a 6V or 12V battery? 12V is better for running coils but in either case you should be able to determine the battery condition by checking the voltage.
Many have reported that plug fouling was eliminated by using a hot air pipe on the carb intake. Does you car have one?
Do you have a water pump? A water pump may cause the engine to run too cold.
Jim
NH carb,not leaking at all,hot air pipe,6V system,no water pump,needle in carb not grooved..rscent re build. Car ran good prior to me installing an Anderson timer.I always set plug at .030. All good thoughts,I'm going to look at my timing,even though car starts pretty good every time.Doug might have it, when he said too far advanced.
Mike,
Did you check the timing with when you installed the Anderson?
Their time is different than the standard ford roller or New Day timer.
Larry
No Larry I did not. After install,I started car right up and just figured it too be right. Anyone who knows me,knows I knows nuttin about electric,and my son is an electrical engineer( PE variety)I.m going to look at timing first.
Sorry, I missed the fine print nh.
The next question, are the plugs randomly fouling or does 1 and 2 or 3 and 4 foul the most often.
Some times a leak around one of the intake manifold inlet areas will make it impossible to adjust the carb to a good running point.
The coils can also randomly misfire until the plug fouls and that situation will go almost un-noticed.
All have a similar fouling look
Timing. Once you get it your car will run clean. Anderson Timers are a different ball-game when it comes to timing.