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01-16-2022, 01:57 PM | #1 |
Member
Join Date: Jan 2022
Location: Benton, KY
Posts: 32
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Mechanical Advance distributor Identification help
I am new to Model A and B components. Unfortunately for me this distributor data plate has come off and I cant tell what I have here. I see the timing plate says autolite. The back lash and advance springs are so weak that the timing is all over the place. Is this worth fixing?
It is unorthodox, I know, and I have ordered an original manual set up. Could this style even be concidered good for an emergency spare if repaired? Attached photos: |
01-16-2022, 02:06 PM | #2 |
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Join Date: May 2010
Location: So Cal
Posts: 8,749
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Re: Mechanical Advance distributor Identification help
Looks like a Jeep distributor, here is a picture of one I converted.
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01-16-2022, 02:07 PM | #3 |
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Join Date: Jan 2022
Location: Benton, KY
Posts: 32
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Re: Mechanical Advance distributor Identification help
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01-16-2022, 02:41 PM | #4 |
Member
Join Date: Jan 2022
Location: Benton, KY
Posts: 32
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Re: Mechanical Advance distributor Identification help
Thank you Bob C for sending me down the right path! Using your lead I found another thread and some information talking about 50's Jeep CJ5 Both for A and T. Not that crazy of a thing after all but a curve ball for a new owner non the less!
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01-16-2022, 03:40 PM | #5 |
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Join Date: Jan 2022
Location: Benton, KY
Posts: 32
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Re: Mechanical Advance distributor Identification help
New member here so I am going to go on ranting:
I like stock parts and being able to experience the now unique task of manipulating the timing while under way. I also like the idea of being able to cold crank the engine closer to TDC. However, my model B engine and set up was to be a driver car. This is a serious hobby for me and I want to drive A LOT of miles once sorted. The Jeep mechanical distributor pictured above still seems to be a viable option. The Model A aftermarket mechanical distributors are available to order at a reasonable price. Who doesn't like options though? I just looked at a complete replacement distributor for the Jeep and it is $135 including cap etc. Could be cost savings at play here. I am not afraid to tinker in fact I have already cast my own aluminum water pump impeller and machined new starter bushings from scratch. I think once I have the standard part here I might rebuild this old Jeep part for fun. |
01-17-2022, 01:41 PM | #6 |
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Join Date: Jan 2014
Location: Asheville NC
Posts: 49
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Re: Mechanical Advance distributor Identification help
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01-17-2022, 11:59 PM | #7 |
Member
Join Date: Jan 2022
Location: Benton, KY
Posts: 32
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Re: Mechanical Advance distributor Identification help
31steve, What advance range should one expect? Static timing degree target? I was messing with that Willys Jeep distributor today because I cant help myself. I shortened the stretched advance springs by one coil and took out the slop but have certainly changed the advance curve.
Marked my crank pulley 0, 19, and 40. Set the points to just open @19 with a buzz box as if it were a "B" distributor. It ran quite nice but if I had a closer to TDC it would probably start with less throttle. |
01-18-2022, 04:40 PM | #8 |
Member
Join Date: Jan 2014
Location: Asheville NC
Posts: 49
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Re: Mechanical Advance distributor Identification help
Busmoss, It's been a while since I set it and I will check next time I get my light out, but I think I set it at 20 degrees and it advances to 32 to 35 range. I could have set the advance higher but wanted it to start easy.
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01-18-2022, 05:09 PM | #9 |
Senior Member
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Re: Mechanical Advance distributor Identification help
Steve,
Is there any advantage to setting the advance higher? Is it so you can rev the engine higher or idle at higher RPM? David Serrano |
01-19-2022, 07:41 AM | #10 |
Member
Join Date: Jan 2022
Location: Benton, KY
Posts: 32
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Re: Mechanical Advance distributor Identification help
Thanks for the help!
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01-19-2022, 09:22 AM | #11 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,897
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Re: Mechanical Advance distributor Identification help
The amount of advance can vary with the load, rpm, and compression ratio and other factors. There is knee in the advance curve were retarding will decrease the performance and advancing will have no effect. An experienced Model A driver will instinctively adjust the advance for different loads and rpms, and perhaps the GAV too. More modern distributors had combined centrifugal and vacuum advance to adjust for load and rpm. The modern cars have a computer that does all the thinking for you.
Too much advance can ruin the rod bearings in short order and have other detrimental effects. I like the manual distributor because that is what I am used to after 60 years of driving Model A's and I like being able to adjust the advance according to conditions.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
01-21-2022, 07:23 AM | #12 |
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Join Date: Feb 2015
Location: Australia
Posts: 1,970
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Re: Mechanical Advance distributor Identification help
With a low compression head you can advance the spark quite a bit for much better performance so long as it doesn't ping. The B engines had, I think, 19 degrees advance to start with, so long as you don't crank it by hand and risk a backfire. The spark should advance quickly as it is a low revving engine.
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01-21-2022, 12:23 PM | #13 |
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Join Date: Jun 2015
Location: Red Deer, Alberta
Posts: 5,043
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Re: Mechanical Advance distributor Identification help
There is information about using a Honda Civic distributor in this thread:
https://www.fordbarn.com/forum/showt...ivic&showall=1
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07-27-2022, 07:47 AM | #14 | |
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Join Date: Jul 2022
Posts: 13
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Re: Mechanical Advance distributor Identification help
Quote:
Steve have you had a chance to survey the Jeep Distributor timing /curve? Can you advise a model number or Jeep vintage you modified from? Matt |
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