measure gap between rotor and plug posts in distributor cap simple question. how do I measure the gap between rotor and plug post striker post. or do I simply purchase new rotor and distributor cap. ??
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Re: measure gap between rotor and plug posts in distributor cap feeler gauge
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Re: measure gap between rotor and plug posts in distributor cap 2 Attachment(s)
You must have a the modern one piece distributor cap available from vendors. You need the original style two piece cap. (body and cap) Then get your feeler gauge out and measure the gap between rotor and body contacts.
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Re: measure gap between rotor and plug posts in distributor cap 2 Attachment(s)
This may help. Make the gap 0.015" to 0.025" by gently /carefully bending the brass tab on the rotor. The rotor's tab should pass by the middle of the contact in the distributor body. If the tab becomes loose or the rotor breaks, get a new one.
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Re: measure gap between rotor and plug posts in distributor cap What I have found is that too large a gap causes the engine to not run as well and backfire occasionally. A slight gap or the spring touching the carbon contact work fine.
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Re: measure gap between rotor and plug posts in distributor cap run my 31 roadster with a gap of thirty five thousands at the rotor tip . I like to run the same gap at the spark plugs .
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Re: measure gap between rotor and plug posts in distributor cap thankyou all of you. I will take the distributor off my tourer with a removable cap and put it on the ute so as I can measure. the rotor looks warn so a new replacement may well be in order. thankyou again, gary
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Re: measure gap between rotor and plug posts in distributor cap As in post #5 bend the brass tab on the rotor to adjust the gap. However to get the gap to the right distance you may have one or two that after bending the tab the gap is too small. On those I use a small file and take some off the posts on the distributor body.
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Re: measure gap between rotor and plug posts in distributor cap Ditto with crosscut.
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Re: measure gap between rotor and plug posts in distributor cap In most cases for me , the posts or contacts in the distributor cap body are different lengths . I measure and file as necessary to make the posts-contacts all the same length . I then install the rotor and remeasure the gaps and make them all the same . Ford recommended a conservative gap of twenty five thousands .
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Re: measure gap between rotor and plug posts in distributor cap You might measure the distance between the opposing contacts in both caps to see if they are the same, might give you another reference point , once you have measured with the original cap.
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Re: measure gap between rotor and plug posts in distributor cap The spark gets hotter when it jumps a gap . Just a way to get hotter spark for free if you want it . Of course an original model A doesn't necessarily need hotter spark . Hotter spark can be of benefit with modified engines .
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The gaps between the rotor and the distributor body on my A are quite different from one terminal to another but the engine runs just fine that way. |
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I'm not sure the increased hotter spark is free though, it is a little bit harder on the ignition components. If you have Quality healthy parts, there should be no problem. |
Re: measure gap between rotor and plug posts in distributor cap Back in the day I wanted to save as many electrons as I could just for the sparklers. So I soldered the distributor contacts to keep that gap as small as possible. I'd solder and then spin the shaft by hand to scrape off all the lead I could. I didn't want any misfires at 8K.
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Re: measure gap between rotor and plug posts in distributor cap It will take a lot of mods for the model A engine to turn eight thousand RPMs .
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Re: measure gap between rotor and plug posts in distributor cap ...
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Re: measure gap between rotor and plug posts in distributor cap Why would you want a hotter spark inside the distributor?
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Re: measure gap between rotor and plug posts in distributor cap Not talking about Model As guys.
Was being paid to drag race back then. Those engines went 8k. I didn't want a hotter spark in the distributor, I wanted all the spark for the sparklers[ which didn't have ground wires most of the time] |
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