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Epoxying Mechanical advance slots- Updated #141888
10/26/08 08:11 PM 10/26/08 08:11 PM

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I changed a spring in my distributor (stock electronic ign SB mopar- vintage unknown) and checked my timing.

When I adjust it to get 32 degrees total advance, I have something stupid like 0 or 2 degrees advance. will not work for me.

So I can buy a new distributor but just for jollys, I want to shorten up the slots in the centrifical advance. I heard I could JB weld it.

About how much do you go to get 18 degrees initial at 1000 rpm and below and a total of 32 dgrees. I know its a rough estimate. just looking for a starting place.
Re: Epoxying Mechanical advance slots #141889
10/26/08 08:19 PM 10/26/08 08:19 PM
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Kirkland, Washington
Pacnorthcuda Offline
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Quote:

I changed a spring in my distributor (stock electronic ign SB mopar- vintage unknown) and checked my timing.

When I adjust it to get 32 degrees total advance, I have something stupid like 0 or 2 degrees advance. will not work for me.

So I can buy a new distributor but just for jollys, I want to shorten up the slots in the centrifical advance. I heard I could JB weld it.

About how much do you go to get 18 degrees initial at 1000 rpm and below and a total of 32 dgrees. I know its a rough estimate. just looking for a starting place.



So you have a bout 30 degrees total mechanical and you want 14....roughly half. Just pull the Dist and examine the amount of travel that the 'pins' travel in slots as you operate the advance by hand. Then just epoxy up about 1/2 that. Keep in mind you may want to use a round rat-tail file on the epoxy after cure to fine tune the amount, get it even from side to side, and create a nice arc for the pin to stop against
Re: Epoxying Mechanical advance slots [Re: Pacnorthcuda] #141890
10/26/08 08:37 PM 10/26/08 08:37 PM

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btw, do some stock distributors actually come with this much initial? I could have bad numbers (things were jumping around a lot) but thats what it looked like
Re: Epoxying Mechanical advance slots #141891
10/26/08 09:27 PM 10/26/08 09:27 PM
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Niagara, Ontario Canada
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Re: Epoxying Mechanical advance slots [Re: mrpatel] #141892
10/26/08 09:43 PM 10/26/08 09:43 PM
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Lincoln Nebraska
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I had some Jb weld come loose on one of mine so I started welding them. A good timing chain and adding a collar on the end of my dist shaft where it fits into the intermediate shaft made my timing marks rock steady

live every 24 hour block of time like it's your last day on earth
Re: Epoxying Mechanical advance slots #141893
10/26/08 10:01 PM 10/26/08 10:01 PM
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Quote:

btw, do some stock distributors actually come with this much initial? I could have bad numbers (things were jumping around a lot) but thats what it looked like



Yes , for some odd reason mopar has a mile of mechanical advance built into most all distributors .
Re: Epoxying Mechanical advance slots [Re: JohnRR] #141894
10/26/08 10:25 PM 10/26/08 10:25 PM
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Lincoln Nebraska
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Quote:

Quote:

btw, do some stock distributors actually come with this much initial? I could have bad numbers (things were jumping around a lot) but thats what it looked like


Yes , for some odd reason mopar has a mile of mechanical advance built into most all distributors .


live every 24 hour block of time like it's your last day on earth
Re: Epoxying Mechanical advance slots [Re: RapidRobert] #141895
10/27/08 12:16 PM 10/27/08 12:16 PM
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Newfoundland
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The slots in mine were approx 7/16" long with approximately 26 deg mech. advance. I Jbwelded the slots in, Let the epoxy set up indoors for 48 hours, then filed the slots down to .320" using a dial caliper for constant check. Right now I have 20 deg initial and about 12 mech advance.
Glenn
Re: Epoxying Mechanical advance slots [Re: Crocker] #141896
10/27/08 12:43 PM 10/27/08 12:43 PM
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Virginia
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My experience was the same as Crocker's.

I made the slots a little under 1/2 the original length, then by trial and error, rat-tail filed them out to the proper length. I think I had to partially disassemble the distributor 3 times to get it right - no biggie. It goes really fast after you get the hang of it.

Unlike Rapid Robert, the JB Weld in my distributor is holding up fine. Thanks, Robert, for giving me something else to worry about! THAT'S what I needed!

Jim
Re: Epoxying Mechanical advance slots [Re: JimG] #141897
10/27/08 12:47 PM 10/27/08 12:47 PM
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the house on the left.
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if you look in the first issue of mopar enthusiast magazine there is a chart saying how big the slots should be for different about of curve,
Re: Epoxying Mechanical advance slots [Re: cogen80] #141898
10/27/08 12:52 PM 10/27/08 12:52 PM
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the house on the left.
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here ya go i found the magazine,

dist. degrees X 2 + initial= total


dist. degrees / slot size
6.............. .340
7............... .355
8............... .375
9............... .390
10.............. .405
11.5 ........... .420
12.............. .435
13.............. .445
14.............. .460
15.............. .475
16.............. .490
17.............. .505
18.............. .520
Re: Epoxying Mechanical advance slots [Re: cogen80] #141899
10/27/08 01:01 PM 10/27/08 01:01 PM
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Quote:

here ya go i found the magazine,

dist. degrees X 2 + initial= total


dist. degrees / slot size
6.............. .340
7............... .355
8............... .375
9............... .390
10.............. .405
11.5 ........... .420
12.............. .435
13.............. .445
14.............. .460
15.............. .475
16.............. .490
17.............. .505
18.............. .520



Right click, save as... Thank You!!!

Re: Epoxying Mechanical advance slots [Re: cogen80] #141900
10/27/08 01:23 PM 10/27/08 01:23 PM

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Quote:

here ya go i found the magazine,

dist. degrees X 2 + initial= total


dist. degrees / slot size
6.............. .340
7............... .355
8............... .375
9............... .390
10.............. .405
11.5 ........... .420
12.............. .435
13.............. .445
14.............. .460
15.............. .475
16.............. .490
17.............. .505
18.............. .520



BAM! YOU DA MAN!

I was searching EVERYWHERE for that chart but only found bits and pieces for 1 or 2 slot lengths (and even those were suspect.

I ended up doing some measureing this morning on my pieces and came up with what I imagined would be the correct slot length for roughly 14 degrees of advance (thats 18 initial + 14 mech = 32 total) and figured the slot should be about .340"

your chart shows about .355" for 14 degrees at the crank so I wasnt too far off. I'll start with .340 and see what I get.

Thanks!
Re: Epoxying Mechanical advance slots #141901
10/27/08 01:30 PM 10/27/08 01:30 PM
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the house on the left.
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cogen80 Offline
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no problem.. its right out of the magazine so if its wrong its ted wagner's fault. lmao
Re: Epoxying Mechanical advance slots #141902
10/27/08 01:38 PM 10/27/08 01:38 PM
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Ontario, Canada
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What motor is this ... isn't 38 degrees the ideal amount of total advance for most Mopars ???
Re: Epoxying Mechanical advance slots [Re: Stanton] #141903
10/27/08 01:43 PM 10/27/08 01:43 PM
Joined: Nov 2007
Posts: 5,337
the house on the left.
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cogen80 Offline
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Quote:

What motor is this ... isn't 38 degrees the ideal amount of total advance for most Mopars ???



looks like some kind of small block. i run 35* +/- total in my small blocks and 38* +/- in my big blocks.
Re: Epoxying Mechanical advance slots #141904
10/27/08 01:47 PM 10/27/08 01:47 PM
Joined: Apr 2004
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Mass
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Quote:

So I can buy a new distributor but just for jollys, I want to shorten up the slots in the centrifical advance. I heard I could JB weld it.




If you are going to purchase a new distributor get a MP unit. The slots are adjustable on them so you can set it to what ever you want.

Dave Clement Pembroke, MA 03 PT Cruiser GT Turbo 99 Dakota SLT+ CC 4x4 68 Barracuda sport coupe http://home.comcast.net/~dgc333/
Re: Epoxying Mechanical advance slots [Re: cogen80] #141905
10/27/08 03:54 PM 10/27/08 03:54 PM
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Sac, CA
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mopowers Offline
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Quote:

here ya go i found the magazine,

dist. degrees X 2 + initial= total


dist. degrees / slot size
6.............. .340
7............... .355
8............... .375
9............... .390
10.............. .405
11.5 ........... .420
12.............. .435
13.............. .445
14.............. .460
15.............. .475
16.............. .490
17.............. .505
18.............. .520



Is this for a BB or a SB? Or both?

Thanks for posting that chart by the way. That'll be nice to have.
Re: Epoxying Mechanical advance slots [Re: mopowers] #141906
10/27/08 03:56 PM 10/27/08 03:56 PM
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the house on the left.
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cogen80 Offline
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should be the same for both.


the chart was in the first issue of MoE. in the second issue there is another article about timing also. both articles are written by ted wagner and answer allot of questions i see posted on various boards.
Re: Epoxying Mechanical advance slots [Re: cogen80] #141907
10/27/08 05:37 PM 10/27/08 05:37 PM

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i am running a 416 sb. typically, I do run my 340's/360's at 34-36 degrees total. But Ive read in several places now that strokers like their timing down around 30-32. So I want to give it a shot.
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