Re: Model A Distributor with Centrifugal Advance 1 Attachment(s)
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I made a stop for the lever to limit advance per the Phillips advance instructions. http://www.fordgarage.com/pages/phillipsspark.htm Total advance is set at ~28°. |
Re: Model A Distributor with Centrifugal Advance Quote:
https://www.fordbarn.com/forum/showt...ivic&showall=1 |
Re: Model A Distributor with Centrifugal Advance Quote:
I've found advance stays the same,1 degree per 100 rpm with a 7 to 1 head,which is the upper limit for a model a head due to flow reduction. There were some problems noted by some people with the FSI advancing a little too far at peak,a few degrees over the 1 per 100 threshold..I don't find that with mine.What does happen when increasing compression is that the engines tolerance for timing deviation lessens,dont run a high compression head with manual advance. 4.2 to 1 is tolerant of timing flaw,you can set one fixed timing and drive..7 to 1 will hammer on you,with a bigger hammer than 4.2 to 1.. |
Re: Model A Distributor with Centrifugal Advance On the subject
I have found that spark plug positioning in flatheads will influence the need for less spark advance Compression and the condition of the balance of the motor allow for more or less advance Getting into overhead designs the advance curve will be much different John |
Re: Model A Distributor with Centrifugal Advance Quote:
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Re: Model A Distributor with Centrifugal Advance Its not hard to 'farmer' map a mechanical advance distributor.On a stock model a pulley 1/4" is five degrees,pin your engine,rig a pointer and mark a line on your crank pulley..thats tdc...get a cheapie tach dwell meter and hook it to your coil,set it to 'tach' and read the 4 cylinder scale,at idle it should be 500rpm or so with your timing light your mark should be 1/4" to the right of the pointer..run idle up to 1000 rpm on your meter,your mark should be 1/2 " to the right of the pointer..basically for each 1/4 " of separation from pointer to mark as seen with the timing light is 1 degree advance per 100 rpm..give or take,farmer style..
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Re: Model A Distributor with Centrifugal Advance Oops, wrong thread.
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Re: Model A Distributor with Centrifugal Advance Also Mallory made the 2301105 for Model A spark curve.
And 2301106 for Model B engine. I have single point version and a dual point version of 1105. Both of these have spring sets and user adjustable weights and stops to setup the curve and max advance. I have a copy of instructions that explains the setup on the house computer. NOTE I am not at the house to check the part number just now. |
Re: Model A Distributor with Centrifugal Advance Quote:
The modifications to quadrant in the WINFIELD DIAGRAM are the same. |
Re: Model A Distributor with Centrifugal Advance 1 Attachment(s)
Mallory distributor part numbers corrected in blue test in post #30.
Here is photo: https://www.summitracing.com/parts/maa-2301105#overview NOTE: I have not been able to find the instruction sheets. Mallory has deleted them from the website. So the links that I saved are no good. Lesson learned I will not trust saving links anymore to save information. |
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