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Frying dizzy contact photo

Moderator: Mod Squad

F-250 Restorer
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Posts: 712
Joined: Wed Jan 13, 2010 10:42 pm

Frying dizzy contact photo

Post #1 by F-250 Restorer » Sun Jul 22, 2018 4:49 pm

So this has been going on for ages. I run a ds2 dizzy with msd 6a digital box, and a summit coil. I have to change the cap and rotor twice a year. This photo is a high dollar brass contact cap.

Luckily, I simply cash in the warranty and exhange for a new one. This is now beginning to annoy me. I enjoy the performance but would also enjoy longevity. I am running too much power through the cap, and wonder what my alternatives are.

Image
That is a BRASS contact!!

pmuller9
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Location: Columbus, Indiana

Re: Frying dizzy contact photo

Post #2 by pmuller9 » Sun Jul 22, 2018 4:54 pm

Check the rotor phasing.
Put the crank at about 20 degrees BTDC and look to see how close the rotor tip is to the cap post.

pmuller9
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Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: Frying dizzy contact photo

Post #3 by pmuller9 » Mon Jul 23, 2018 8:53 am

I would really like a response concerning the rotor phasing.
It has to do with where the MSD triggers off the signal from the DS2 distributor.
Thanks

F-250 Restorer
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Joined: Wed Jan 13, 2010 10:42 pm

Re: Frying dizzy contact photo

Post #4 by F-250 Restorer » Mon Jul 23, 2018 11:44 am

Hello Pmuller: Thanks for the reply. It took a while b/c I had to read a bit about rotor phasing. I will try to get to the garage and set it up with a marker and mark the r. position relative to the contack @ 20* btdc.

I'll try to post findings this evening.

BTW, the Blondie cam engine will soon be going together, 351 pistons, 68 rods, etc. I'll be using the photo of your combustion c. as a guide when removing the ridges around the valves in my chambers.

F-250 Restorer
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Posts: 712
Joined: Wed Jan 13, 2010 10:42 pm

Re: Frying dizzy contact photo

Post #5 by F-250 Restorer » Wed Jul 25, 2018 7:58 pm

I was surprised to see that the rotor is almost centered on the contact @ 20* advanced.

Image

I also found a great write up on rotor phasing: http://www.junkyardgenius.com/ignition/ ... ing01.html

Thanks, Pmuller9

pmuller9
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Location: Columbus, Indiana

Re: Frying dizzy contact photo

Post #6 by pmuller9 » Thu Jul 26, 2018 12:38 am

Your rotor phasing looks fine.

Good link on rotor phasing.
Just for fun you can use the old cap and make a window just to see what the phasing is while the engine is running.
You can also check to see how much the gap is between the rotor tip and the cap contact.
You may have the short rotor.

I don't know what else would be burning the cap contacts.

1986F150six
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Location: Northwest Alabama

Re: Frying dizzy contact photo

Post #7 by 1986F150six » Thu Jul 26, 2018 11:18 am

I, too, am using MSD 6AL ignition box and have for many years. It works quite well, but it is hard on the distributor cap and rotor. Mine seem to need replacement @ about 25-30K miles.

The Frenchtown Flyer once suggested coating the contact areas with a light coating of dielectric grease. I did this and it does seem to have helped extend the period of time prior to needing replacement and the contacts do not look quite as bad.

Harte3
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Location: Spokane, WA

Re: Frying dizzy contact photo

Post #8 by Harte3 » Thu Jul 26, 2018 1:59 pm

I coat the contacts with poor man's dialectic...petroleum jelly.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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