Carb / Percolation and coil voltage question
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    My name is Martin 30psi's Avatar
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    Carb / Percolation and coil voltage question

    I noticed that after I stopped my car last night and came back about half hour later to cover the car up I could smell it was a bit fuely.

    So i check the carb over in case it was leaking and I could see throught the sight plug the fuel in the secondary chamber was bubbling away (but oddly not on the primary chamber). I thought it was quite entertaining to be honest, so I put my finger over the chamber vent and fuel literally squirted out of the top of the carb via the air bleeds.

    Anyway, will a 1/2" spacer stop the fuel from boiling?

    The other thing (which may in part be related to the above) is what voltage should I see at the coil when cranking the engine? I thought it should be about 4-5V from the ballast when idling or ignition turned on BUT then jump to 12V when cranking. Am I right in assuming this? If so I need to wire in a jumper wire.

    The engine when stone cold can start on the flick of the key most of the time otherwise it will be a right pain. When hot, however, if left for say 5 mins it starts on the flickr of the key, couldn't ask for any better. But if left for say an hour it takes a good 10 secs of cranking to see the engine spring to life. Is that likely to be a result of the fuel boiling in the carb or the lower voltage?

    Thanks in advance for any thoughts

    Oh btw, the engine idles a bit rich but not excessive at 12:1.

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    Official RnS Addict ZEPHYRV8CHRIS's Avatar
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    You will get tham from both problems, i would try the spacer first i had the same problem and the spacer worked a treat

  4. #3
    Supercharged 461 cu in prostreet70gto's Avatar
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    the ballast should drop to 9 or 10 volts. What distributor/ignition are you running? if its electronic you need a 12v clean feed from the live side (direct side ) of the ballast to the dizzy, if its points its not so drastic unless its a dual point dizzy. id try a spacer too as this is more likely to be the prob.
    One word can say so much.....BLOWN

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  6. #4
    My name is Martin 30psi's Avatar
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    Its got some breakerless ignition with a control box for it. I'd have to unbolt the box I can't remember the make of it. But it's a fairly old optical system.

    I'll check the voltage at the box as I seem to think this is powered independant of the coil as it doesn't directly connect to the coil power. i.e it's only connection with the ignition is with the sensor in the dizzy and the coil's earth.

    You can see the box on the inner fender


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