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09-30-2020, 02:38 PM | #21 | |
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Re: Ignition timing question
Quote:
The stock Model A distributor spark lever is *supposed* provide a total of 40 crank degrees of timing change (20 degrees of rotor change). So if you are starting at 5* AFTER TDC at the top, moving the timing lever all the way down should bring you to 35* BEFORE TDC. Please check the readings that you report above again. You should not be able to go from 5* ATDC to 45* BTDC. That is 50* of change. Something is not right. Maybe you misread something or wrote it down wrong. .
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09-30-2020, 03:24 PM | #22 | |
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Re: Ignition timing question
Quote:
Yep. At first he had 20º to 25º advance. After adjusting points and timing he now has 50º. It doesn't compute. |
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09-30-2020, 03:26 PM | #23 |
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Re: Ignition timing question
See post 11.
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09-30-2020, 07:01 PM | #24 |
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Re: Ignition timing question
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09-30-2020, 07:53 PM | #25 |
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Re: Ignition timing question
I use the method in the owners manual so that handle up is 0 degrees and down is about 40 degrees advance.
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09-30-2020, 08:57 PM | #26 | |
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Re: Ignition timing question
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Quote:
Please check post #19 item number 1.That reading was somewhat of a guess because the Nu-Rex degree indicator only goes up to 15* retarded. The reading with the lever all the way down was definitely at 5* retarded because I could see the yellow paint mark line up with the 5* retarded mark on the degree indicator. So that reading may not have been correct. I did another adjustment today and I came up with 15* retarded with the lever all the way up and 35* advanced with the lever all the way down. That works out to be a total range of 50* from lever up to lever down. That range matches the first adjustment that I made (post #19, item number 2). So that means that the first reading must have been lever up--55* retarded lever down 5* retarded. That still gives me a total range of 50*. That range seems larger than what it should be? According to the Nu-Rex instruction sheet "the total range of steering column spark control is approximately 40* of crankshaft travel". Why am I having 50* of travel? Since this car belongs to a friend of mine I would rather have the total advanced reading at 30* or 35*. He is a "lever up to start and a lever down to drive" type of person, so you can see where I am going with this!
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10-01-2020, 06:58 AM | #27 |
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Re: Ignition timing question
Just for the heck of it set the timing as Ford says. Lever up at TDC. That lever is adjustable in that you can bring it down as far or as little as you want.
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10-01-2020, 07:55 AM | #28 |
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Re: Ignition timing question
I do not know why you would have 50*. However at the desired max advance lever position perhaps drill a hole in the Quadrant and add a bolt/nut to limit the advance lever? I have seen this done on cars with high compression heads.
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10-01-2020, 10:37 AM | #29 | |
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Re: Ignition timing question
Quote:
That's all I can think of. Maybe swap in another distributor body as a test. You really should not be getting more than 40* change from "up" to "down". .
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10-01-2020, 11:07 AM | #30 | |
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Re: Ignition timing question
Quote:
Yep, that happens. Timing doesn't get set correctly apparently and to gain more advance the body/housing gets hacked. Or, someone gets to thinking if thats all Ford wants, then, more must be ' more better '. But it could also be the timing light or the tape. |
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10-02-2020, 10:36 AM | #31 | |
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Re: Ignition timing question
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I have never seen a timing pin as shown in the first picture in post #12 slide in that deep. Even when it has seated in the dimple, there is usually an 1/8th inch or more of the shaft showing. This one is right down to the base. Is it a stock timing pin? I don't have the measurement handy, but my best guess is that the length of the pin is about 1 1/4 inches from the base to the tip. If your pin is too short and it's bottoming our on the timing cover, it can't drop into the dimple on the timing gear. |
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10-02-2020, 05:53 PM | #32 | |
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Re: Ignition timing question
Quote:
I have no idea if the timing pin is stock. I can feel the pin fall into the dimple as I turn the crank, so I know that it is on top dead center. I don't know why I have 50* of travel but I do have that much. At this point all I need to do is make sure that the advanced figure (with lever all the way down) is not too much advance timing. If 35* is ok then I can leave it the way it is right now. I don't see a problem having too retarded timing when starting the engine? I can't see where making the slot in the distributor cap bigger would make any difference. The tabs on the steering column are what determines the total travel.
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10-03-2020, 04:51 AM | #33 | |
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Re: Ignition timing question
Quote:
Here is what I made: https://www.fordbarn.com/forum/showp...2&postcount=23 One question, is the 50 deg with the dizzy body on? It is only a valid measurement with the body in place. |
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10-03-2020, 06:00 AM | #34 | |
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Re: Ignition timing question
Quote:
I like your stop with a set screw. Very good, simple solution. I will be making me one. .
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10-03-2020, 08:18 AM | #35 | |
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Re: Ignition timing question
Quote:
One question--if I leave the setting as it is, the max advance would be 35* is that a problem?
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10-03-2020, 12:26 PM | #36 |
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Re: Ignition timing question
35* is a bit much, but as the points cam follower wears, and the point gap closes, that 35* will go down.
BTW, Ford's May, 1928, Service bulletins says to gap the points 0.018"-0.022". Your 0.018" is going to close down as the cam follower wears. Better to start up around 0.022". There was an earlier bulletin with a smaller gap specified, but Ford changed it later to be the 18-22. .
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10-03-2020, 01:00 PM | #37 | |
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Re: Ignition timing question
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