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> Distributor ignition rotor fried, Anyone know why?
jcambo7
post Jun 29 2017, 10:40 AM
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QUOTE('73-914kid @ Jun 28 2017, 11:21 PM) *

I would be very surprised to see any damage to the points. With an MSD box, they are just a trigger mechanism.

For a quick test, grab a vw type 1 rotor (with resistor would work fine for a quick test) and try and start it. Brief running time on the rotor won't damage anything.

So I bought a VW type 1 rotor and a replacement rotor like the one I fried. The engine still didn't start. I need to do some volt meter testing. I'm curious still though if the distributor could have been fried when I continued to try and start the engine when I fried the ignition rotor without realizing it?
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Mark Henry
post Jun 29 2017, 11:33 AM
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Are you using a MSD or just a MSD coil?

If just a coil that likely fried the condenser.
There is a small ground wire inside the dizzy, plate to body, check that as well.
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jcambo7
post Jun 29 2017, 11:45 AM
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QUOTE(Mark Henry @ Jun 29 2017, 12:33 PM) *

Are you using a MSD or just a MSD coil?

If just a coil that likely fried the condenser.
There is a small ground wire inside the dizzy, plate to body, check that as well.

What is the condenser? I have the MSD ignition module and coil. The ground wire has been like that since I got the car. I checked the OHM's on the spark plugs and they are 3,930 and I was reading that they should be 10,000? Don't know how true that is for this car though. I'm getting 12v at the coil also when trying to start.


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Dave_Darling
post Jun 29 2017, 12:03 PM
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Have you definitely confirmed that you are not getting spark?

--DD
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Mark Henry
post Jun 29 2017, 12:05 PM
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Little ground strap, right side in pic, still attached good?
Looks a little banged up, but attached in the pic.
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jcambo7
post Jun 29 2017, 12:12 PM
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QUOTE(Mark Henry @ Jun 29 2017, 01:05 PM) *

Little ground strap, right side in pic, still attached good?
Looks a little banged up, but attached in the pic.

It's still attached good and it's been like that since I got the car.
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jcambo7
post Jun 29 2017, 12:14 PM
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QUOTE(Dave_Darling @ Jun 29 2017, 01:03 PM) *

Have you definitely confirmed that you are not getting spark?

--DD

As far as my electrical troubleshooting knowledge goes (which isn't far) I am not getting spark to the plugs. I took a plug and connected it to the #1 wire and held it close to engine case bolt and saw no spark. My points are gapped properly also.
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Mark Henry
post Jun 29 2017, 12:17 PM
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Looks like a lot of corrosion on the dizzy cam lobes. That would wear the points blocks PDQ.
Hows the shaft play, both side to side and up/down?
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jcambo7
post Jun 29 2017, 12:19 PM
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QUOTE(Mark Henry @ Jun 29 2017, 01:17 PM) *

Looks like a lot of corrosion on the dizzy cam lobes. That would wear the points blocks PDQ.
Hows the shaft play, both side to side and up/down?

The shaft doesn't move side to side at all and goes up and down very slightly.
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Mark Henry
post Jun 29 2017, 12:20 PM
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QUOTE(jcambo7 @ Jun 29 2017, 02:14 PM) *

QUOTE(Dave_Darling @ Jun 29 2017, 01:03 PM) *

Have you definitely confirmed that you are not getting spark?

--DD

As far as my electrical troubleshooting knowledge goes (which isn't far) I am not getting spark to the plugs. I took a plug and connected it to the #1 wire and held it close to engine case bolt and saw no spark. My points are gapped properly also.

You have to hold the plug to the case, look for the spark in the plug gap.

Also:
https://www.msdperformance.com/support/trou...ing_techniques/
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craig downs
post Jun 29 2017, 10:37 PM
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Where is your condenser? It is a little round part that is about 3/4 in diameter by 1" long that usually is attached to the outside of the distributor with a wire running to the points.
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jcambo7
post Jul 4 2017, 05:42 PM
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QUOTE(craig downs @ Jun 29 2017, 11:37 PM) *

Where is your condenser? It is a little round part that is about 3/4 in diameter by 1" long that usually is attached to the outside of the distributor with a wire running to the points.

The dizzy has never had one since I have owned the car.
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IronHillRestorations
post Jul 4 2017, 06:01 PM
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Bingo!
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Mark Henry
post Jul 4 2017, 08:03 PM
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QUOTE(craig downs @ Jun 30 2017, 12:37 AM) *

Where is your condenser?

MSD the points are just a trigger, no condenser needed, no ballast needed.
Points are only seeing milliamps, not enough to do that damage IMO.
One thing I have heard of is the points can't burn away any oil mist, not a big issue in our engines, but you do have to keep an eye on dirt and grime.

(IMG:http://www.914world.com/bbs2/uploads_offsite/forums.pelicanparts.com-26-1499220184.1.jpg)
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IronHillRestorations
post Jul 4 2017, 09:11 PM
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I was mistaken, I missed the MSD part.
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larryM
post Jul 5 2017, 11:38 AM
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http://forums.pelicanparts.com/porsche-911...rpm-solved.html
"Resistor-less rotors are a must, especially when the plug gaps get opened up to .040-.045 as they should.
______
Steve Weiner
Rennsport Systems"
****************************

fwiw - i ran MSD 6A & Blaster coil with pertronix-ignitor and 911 resistor-rpm-limited-rotor & stock 911 wire set (solid wires with suppressor at end) for about 15 yrs on both 2.8 & 2.7 with no failures such as displayed in O.P.

note that MSD also recommend drilling holes in our smallish Bosch cap to relieve ozone buildup - tho i did not do that until the last couple yrs

https://forums.msdperformance.com/forumdisp...ation-Questions

****************************
QUOTE(Mark Henry @ Jul 4 2017, 07:03 PM) *

QUOTE(craig downs @ Jun 30 2017, 12:37 AM) *

Where is your condenser?

MSD the points are just a trigger, no condenser needed, no ballast needed.
Points are only seeing milliamps, not enough to do that damage IMO.
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