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Thread: Gunson 4142 dwell angle connections - HELP

  1. #1
    Regular Member Ste's Avatar
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    Default Gunson 4142 dwell angle connections - HELP

    Anyone know what connections need to be made to the coil, earth, power etc etc to measure the dwell angle on my other car (V8 engine)?

    My mate has leant me his multimeter with this function, as mine doesn't have it.

    Before anyone states the obvious, it isn't for my Vec


    I've already set the points with a feeler blade and got the timing right, engine runs OK, but just want to check via measuring dwell to be doubly sure.


    He can't find the instructions, and I don't want to blow up his kit.....
    Last edited by Ste; 28th January 2008 at 21:53.

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    Regular Member DeathStar's Avatar
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    The red lead goes to the points side of the coil (negative terminal) and the black clamps onto any good ground point on the engine.

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    Regular Member Ste's Avatar
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    I suspected that, but wasn't sure.


    Thanks for the info.

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    Regular Member DeathStar's Avatar
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    I wish my other car had a V8 engine.....mine is a MK 4 spitfire

    I assume 4 sets of carbs to nicely balance

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    Regular Member Ste's Avatar
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    No, just twin 1 3/4" SU carbs.


    I do like the Spitfire though, but only having 2 seats isn't really practical for us..

    Why did I mention practicality ? ? ? Since when has a V8 been practical these days??

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    Regular Member DeathStar's Avatar
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    Thats the problem I have now, since the daughter has been born. Only done about 100 miles in it!

    thinking about getting the luggage rack for the boot and creating an ISOFIX bar so I can put the cat seat on

    Good old SU's 1 1/4" in the 1.3 Spit - Good old hose pipe to set the hiss right for the balance...lol

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    Regular Member Ste's Avatar
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    Hose pipe hiss, lol.

    Best way is to have a tap in at each carb, connect rubber tube to a 'U' half filled with water and when each are balanced, the water level should be equal in each side of the 'U'.

    OR, get a Digital Delta Pressure sensor to set them up evenly....

    But the hiss from a hose pipe works too, just a bit agricultural.

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    Regular Member DeathStar's Avatar
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    yes, the manometer type way is always reliable also

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    Regular Member Ste's Avatar
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    Just to complete this.

    I connected the black to earth and the red to the points side of the coil, and with the engine running the meter showed the dwell angle.

    The book says 26-28°, so being anal I adjusted it to 27° via the adjustment screw on the side of the dizzy. When first connected it showed a dwell of 20°, and as I adjusted it, the engine tone and running improved surprisingly.


    So, thanks DeathStar

  10. #10
    On a Sabbatical VauxVeteran's Avatar
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    LOL, I've got one of those in the garage and a timing gun that looks like a Klingon gun.

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