Pertronix Electronic Ignition Modules

[Gene Gillam]

To save me some time tomorrow when I get around to installing my Christmas present, can someone who's already installed this on their T series car tell me which way the small magnet points in relation to the rotor. In other words, does it face the same direction as the rotor or is it offset 90, 180, 270 degrees? Thanks, Gene Gillam Saucier, MS 1949 MG TC

[David and Joyce Edgar]

Gene, I am not sure I understand your question. My Pertronix unit has two parts. One part is a magnet ring that fits over the cam lobes and the rotor fits above that. There are actually 4 magnets hidden in the ring at 0, 90, 180 and 270 degrees so just slide the ring on and you're good. I however had to shave just a fraction off the bottom of the rotor though for it to sit low enough. The rotor was slightly contacting the cap terminals as it sat too high. The other part is the sensor and plate. Since it has two ears it can only go on two ways. Doesn't matter which way for it to run but is best if sensor is closest to where the wires exit the distributor so they don't flop around inside. Did you get the correct Pertronix unit to match your grounding? Also make sure the distributor cam is the correct on to fit the ring. What else did you TC get for Christmas? David Edgar, TC 5108 El Cajon, California

>can someone who's already installed this on their T series car tell >me which way the small magnet points in relation to the rotor. In other >words, does it face the same direction as the rotor or is it offset 90, 180, >270 degrees?

[Peter Pleitner]

Hi Gene, Congratulations! I installed mine and remember the process well. Unfortunately I don't understand what you mean by "the small magnet". There is a little black-box sensor (Halls effect) which detects the precise position of a magnet field, and a plastic collar for the cam which contains four magnets, presumably 90 degrees apart, but you can't see them. Simply remove the rotor, slip the collar down onto the cam (it can fit in any of four positions) seat it firmly, replace the rotor, and mount the sensor's plate where the points and condenser used to be. The gap between the sensor and the collar is not critical, not like points. The two leads from the sensor must go to the two side terminals on the coil, and mind the polarity! I don't recall how I did it, but I managed without altering my good harness, although its local routing is not factory original anymore. I love it! Doing a static tune I could never sneak up on my mark slowly enough to make the bulb turn brown like I used to, because the Pertronix functions like a digital switch. This to me spells precision and no drift over time. Next I'll update the fuel pump, then the clock. Cheers, Peter -----Original Message----- From: Gene Gillam [mailto:anngene@bellsouth.net] Sent: Friday, December 28, 2001 8:50 PM To: mg-tabc List Subject: [mg-tabc] Pertronix Electronic Ignition Modules To save me some time tomorrow when I get around to installing my Christmas present, can someone who's already installed this on their T series car tell me which way the small magnet points in relation to the rotor. In other words, does it face the same direction as the rotor or is it offset 90, 180, 270 degrees? Thanks, Gene Gillam Saucier, MS 1949 MG TC Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

[Gene Gillam]

David Edgar wrote:

>There are actually 4 magnets hidden in the ring at 0, 90, 180 and 270

degrees so just slide the ring on and you're good.

[Diecuts@aol.com]

Hi all, What is the proper part number of the Petronix unit to fit a TC? TD? Cheers, Lee Jacobsen

[Gene Gillam]

Lee, Visit Skip's website: http://www.shadetreemotors.com/shadeparttd.html This lists all the PerTronix units for the T-series (I think). Gene

----- Original Message ----- From: Diecuts@aol.com> To: anngene@bellsouth.net>; mg-tabc@yahoogroups.com>; djedgar@pacbell.net> Sent: Friday, December 28, 2001 6:07 PM Subject: Re: [mg-tabc] Pertronix Electronic Ignition Modules > Hi all, > > What is the proper part number of the Petronix unit to fit a TC? TD? > > Cheers, Lee Jacobsen >

[John T. Seim]

Basically, there are four configurations of this kit. Kit comes with a new breaker/points plate, that replaces the one in the distributor. LU146 LU146AP12 LU146M LU146MP12 As long as you have a DKY4A distributor body, this kit should fit. You need to know 1. What distributor IS in your car, 2. Vehicle polarity, and 3. Which distributor cam is installed. The symmetric and high lift cam equipped cars use the same kit. LU146 for negative ground, and LU146AP12 for positive ground. If your distributor has an asymmetric distributor cam, you will need either the LU146M for a negative ground car, or a LU146MP12 for a positive ground car. To determine which distributor cam you DO have, remove the distributor cap, and rotor. Take a look at the distributor cam, and compare it to the ones pictured in the TD/TF workshop manual, the Blower manual, or any other T series manual, in the ignition section. You will note that the symmetric and high lift look square, while the asymmetric looks more rounded in the corners. (Note: a symmetric has the notch for the rotor to the left of a cma lobe; the high lift has the notch to the right of the cam lobe)

[joecurto@aol.com]

Lee I stock all the Pertronix units for T series, there are only 2 or 3 sources for them for T series , I am one of them, you need the P/N of your distributor and the suffix letter as well as if you want positive or negative ground, also it pays to compare the shape of the cam i.e. asymmetric, symmetric, or high lift. TC's should have asymmetric but being 50 plus years old things get changed around. You may contact me off list if you are interested in a unit, as for the installation it is easier than changing points and the instructions are very concise and explicit. Joe Curto

[Skip Kelsey]

At 05:49 PM 12/28/01 -0800, Gene Gillam wrote:

>To save me some time tomorrow when I get around to installing my Christmas

Gene: If you have any questions about your Pertronix unit, you should call Pertronix directly. They have a very helpful staff, and are more than willing to answer your questions.I have sold quite a few of these units, and have always had good service from Pertronix. Their toll free nnumber is: 1-800-827-3758 Cheers: Skip Kelsey........................................................

[Skip Kelsey]

At 09:07 PM 12/28/01 -0500, diecuts@aol.com wrote:

>What is the proper part number of the Petronix unit to fit a TC? TD?

Lee: The part numbers are: LU-146 for negative ground cars with symetric or high lift cams. LU-146P12 for positve ground cars with symetric or high lift cams. LU-146M for negative ground cars with asymetric cams. LY 146MP12 for negative ground cars with asymetric cams. Cheers: Skip Kelsey......................................................