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09-19-2019, 07:46 PM | #1 |
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Join Date: May 2010
Location: Santee, California
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Full advance from 28/29
I'm having a problem with getting my distributor to full advance as described in Marcos' 1999 paper.
Specifically, I'm not getting the full range. The paper states the arm should swing the full distance of the slot in the distributor body. At full retard the arm just barely touches the body. And with the advance lever full advance, there is 1/4 inch still to travel in the body slot. Net result, I don't think I'm getting the benefit of full spark advance. I have a 28/29 column, but it's mounted to Randy's F100 box. My thought is rotating the column will only move the area of the slot traveled. It won't increase the travel distance. Am I missing something? |
09-19-2019, 08:20 PM | #2 |
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Join Date: Aug 2019
Location: Hagerstown MD
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Re: Full advance from 28/29
It's a geometry problem, either one or the other ends is out of position or you don't have enough throw on one or the other arm. From the description it sounds more like you need to lengthen the lever on the column so it has a greater ratio (moves the dizzy arm more per degree of movement and adjust it so the full retard position is the same.
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09-19-2019, 10:56 PM | #3 |
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Join Date: Jul 2018
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Re: Full advance from 28/29
Mine did the same thing. I checked it with a timing light and I was actually getting a lot more advance than I thought, too much. Until you check it with a timing light you don’t know how much advance or retard you are getting.
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09-20-2019, 12:36 AM | #4 |
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Join Date: Feb 2017
Location: Northern Idaho
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Re: Full advance from 28/29
Is the slot in the distributor the correct size? I seem to recall a Ford Service Bulletin that said some had been modified by owners or mechanics to have a larger opening. Though I would think that would require other changes too.
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09-20-2019, 01:55 AM | #5 |
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Join Date: Jun 2017
Location: Walla Walla, WA
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Re: Full advance from 28/29
I have the same issue, but I have kind of discounted whether it is important or not, for the simple reason that on my 29, when I am a couple clicks from the bottom of the quadrant, I think that is about all the advance my engine will handle. In other words, at that level of advance, I don't get any more benefit by going all the way down any way, so what difference would it make if I had even more range beyond that? As far as the cause, I think its due to my after-market upper plate. I have one of the newer style plates for the more "modern" point sets. I was comparing that plate, and more specifically, the length of the advance arm that connects to the advance linkage. It appears that the newer after-market plate advance arm is just a wee bit shorter than the original. That would take some of the travel away from the top to bottom range of the advance. I haven't measured anything so this is just a casual observation and nothing factual.
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09-20-2019, 02:07 AM | #6 |
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Re: Full advance from 28/29
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09-20-2019, 06:21 AM | #7 |
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Location: Van, Texas
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Re: Full advance from 28/29
Sideline is right. Check your advance/retard with a timing light. Just because the lever is not moving thefull quadrant does not mean you are not getting the full 28 degrees of advance. Remember, advance is only 28 degrees.
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09-20-2019, 08:00 AM | #8 | ||
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Location: Cow Hampshire
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Re: Full advance from 28/29
And - Check out Vince Falter's page on Distributor Advance.
The Model A has more capability for advance than is actually necessary for optimal operation. Mostly Model B discussion but check out http://www.fordgarage.com/pages/bdistributoradvance.htm Quote:
Quote:
http://www.fordgarage.com/pages/timingiseverything.htm Vince is among the most cogent of sources. Joe K
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09-20-2019, 08:12 AM | #9 |
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Join Date: Apr 2013
Location: Northwest CT
Posts: 1,092
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Re: Full advance from 28/29
I'm guessing you have a standard compression head. If you have one of the higher comp. ratios you definitely don't need the full range of spark advance the lever will give you.
There have been previous threads about incorrect length spark rods. This may be your problem. |
09-20-2019, 11:19 AM | #10 |
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Location: Temecula, CA
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Re: Full advance from 28/29
I agree with ryanheacox.
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09-20-2019, 12:32 PM | #11 |
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Location: new britain,ct 06052
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Re: Full advance from 28/29
X2
Paul in CT |
09-20-2019, 05:52 PM | #12 | |
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Join Date: May 2010
Location: Santee, California
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Re: Full advance from 28/29
Quote:
I do have a stock head installed, all distributor components are original Ford. The only aftermarket part is the spark rod. It makes no sense to me. I guess I'll go with the answer that I'm getting full retard, and enough advance. I'd still like to have it explained to me. |
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