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Old 11-14-2018, 08:23 PM   #1
fordv8j
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Default Spark Plugs

I cleaned the plugs in my 59ab today, they were a little black, would it help to turn the 2 adjustment screws out a little, it runs really well
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Old 11-14-2018, 08:39 PM   #2
Fordestes
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Default Re: Spark Plugs

Check for over rich condition ,leaking power valve, float level, sticking choke etc. the idle mixture setting goes away at road speed.
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Old 11-14-2018, 09:14 PM   #3
Tinker
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Default Re: Spark Plugs

Also consider how you run your engine and the last time checked. A lot short runs or idling.


Check vacuum with a gauge, if your around a solid steady 18-19 then the carb idles are decent.
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Old 11-14-2018, 11:24 PM   #4
flatjack9
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Default Re: Spark Plugs

You turn the screws in to decrease fuel. The idle system is still active during in town driving. Connect a vacuum gauge and adjust for max vacuum.
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Old 11-15-2018, 09:29 AM   #5
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Default Re: Spark Plugs

Quote:
Originally Posted by fordv8j View Post
would it help to turn the 2 adjustment screws out a little, it runs really well
Sounds like you are accustom to modern air adjust carbs. Older carbs adjust the fuel, not the air. When you turn the adjustment screws in it reduces the amount of fuel through the idle ports.
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Old 11-15-2018, 07:41 PM   #6
GB SISSON
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Default Re: Spark Plugs

As a general rule, when you turn the screws in and it starts to stumble, how much to unscrew them?
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Old 11-16-2018, 07:24 AM   #7
Bored&Stroked
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Default Re: Spark Plugs

Looking at spark plugs after the car has been idling and or just driving around town - will tell you practically nothing. Also, looking at the plugs to adjust the idle is not the way to do it (as noted by many up above).

You have to run the car out on the highway under pretty much full load, then put the clutch in and kill the engine to check plugs - and with today's fuel, they usually don't "color" like back in the day. This process has nothing to do with the idle mixture - it is to validate that the main jets and power valves are correctly setup.

What you're doing is messing with the idle mixture richness - and as others have commented, you adjust for the best running condition and highest vacuum (which is pretty much the same thing in the driveway). Good luck . . . don't over think it . . .
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Old 11-16-2018, 09:06 AM   #8
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Default Re: Spark Plugs

my flatheads, at least, like to run better/cooler when the mixture is just a little rich, tuning the carb (s) for clean plugs is a jet size change or changes. I installed a set of the speedway adjustable jets in a deuce set up and was able to get pretty close to the clean plug. has anybody else installed these adjustable jets?
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