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MG MGA - Distributor Rebuild - Aldon

Following Dominic's advice I sent my original 1500 distributor to Aldon for a rebuild, recurving to an 1800 profile and fitting the Ignitor (Petronix) electronic ignition.

Just got the unit back today. Terrific rebuild. Staff very helpful. Totally recommended.

Thanks Dominic.

Steve
Steve Gyles

What do they do when they recurve it? I have a DM2 in a 18v engine. If I understand it correctly, they use different weights and springs that will advance the timming sooner or later. The purpose is mainly for more power and better gas mileage.

What happens if I use a DM2? How much disadvantage do I have over a recurved distributer. The DM2 is working great and I timed it at 3000rpm to 29 degrees. Is it worth it for me to have it worked on. The bushing is tight.
JEFF BECKER

Jeff

I will ask Aldon tomorrow. My understanding from Bob West is that there is precious little difference. I just wanted to go back to my original DM2 (I am currently using a modern equivalent), so I thought it worth having done while it was being rebuilt.

Steve
Steve Gyles

Jeff,
The use of your DM2 depends on what year it was produced. There were two styles. One had a solid steel shaft that slides into the engine, and the newer style had an aluminum housing (in the shaft area) that slides into the engine block. The older steel style used an advance mechanism that's not particularely reliable which has been coine the "toggle" type advacne because of its use of braass toggles on the springs. The newer style is the same as what's used in the more modern 25D distributors and can be retrofitted into the older units.
If you have the newer distributor, you have no (or few) disadvantages. You might, however want to consider bumping your timing up to 32 degrees at 3000 rpms though. A recurve could be to your benefit, depending on which unit you have!
Jeff
Jeff Schlemmer

I am holding back the timing a few degrees as I run a Judson Supercharger. I am trying to avoid pinging and a heating problem. So far...so GOOD.
JEFF BECKER

Jeff, its much easier to set up your distributor to run properly with a supercharger than a new replacement. 6-8 degrees of distributor advance would work best with the forced induction rather than the stock 12-13.
Jeff Schlemmer

This thread was discussed between 07/08/2006 and 08/08/2006

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This thread is from the archive. The Live MG MGA BBS is active now.