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Classic Austin Mini Distributor Electronic 23d For Negative Ground

Classic Austin Mini Distributor Electronic 23d For Negative Ground

Classic Austin Mini Distributor Electronic 23d For Negative Ground
Selected: 23D Electronic Distributor, Pre-A+ Negative Ground
Part No: 12G2140MS
Fits the following:
Classic Mini
Sprite & MG Midget
Morris Minor
NEGATIVE EARTH ONLY. Cooper"S" 23D distributor, no vac unit-This is NOT THE ORIGINAL LUCAS ITEM but a new contact less electric copy of 40819. Fitted with the better Red rotor arm upgrade. Cheaper than many electronic ignition kits. For Pre-A+ engines.

Fitted all Cooper S models but some MK3 "S" were fitted with 41033-23D type--(Note:25d type distributors have a Vac unit.)-This distributor has more advance curve similar to the 41033 (Mk3 "S") which was better for acceleration and economy.See graph on web site from Peter Baldwins rolling road. The 41033 or 41732 Cooper S mk3 distributor was replaced with a 45D type BAU1850 by Rover less a vac unit which fitted Canadian 998cc minis and Marina 1.3 HC engines, but it was never a true replacement part for the Cooper S Mk3. This is why 12G2140 MK1/2 "s"distributors found their way on these cars.

Also fitted to in line engine 1275 Sprite and Midget the 40819 is 7 degrees btdc static and 22 degrees @1200rpm dynamic timing--centrifugal advance in degrees @rpm was 0-3 @600/[email protected]/-- 11-15 @2,000/--22-26 @5,200/

28-32 @7,000
Can this be used on an Austin Healey sprite with a 948cc motor with a scatter pattern APT cam of 296 degrees semi race motor? Having a problem with fouling at low rpm on a non-vacuum advance distributor. Hard to get it to run well at the high end without fouling at the low end. The car has a relatively high compression motor that really only makes power above 3500 rpm. Dual SU H2 carburetors were recently rebuilt. Running a stock distributor with Pertronix and deleted vacuum advance. Has a header and will check runner size. It’s a race car that had work done before I bought it. Tends to carbon foul plugs at idle or partially off idle In first gear. If gets rev up over 3500 will clear but still have low-end stumble. Used to run a AN jet but was replaced on rebuild with one step richer needle.
The C-27H7699 should work with your setup. It reads as though the curve is already set for a range that would be good with your cam.
I would like to suggest the thought that your problem does not sound like a distributor problem. It sounds more to me like a Carb, fuel mixture issue.  A 296 cam is pretty radical for a 948cc motor.
A low end stumble is not out of the ordinary with a 296 in a street car.  While most of the time it can be minimized if you have access to a dyno. I might suggest you recheck the camshaft timing.  A typical 296 has a lobe center of 106 degrees.  Advancing the cam timing to 102 would improve the bottom end performance while degrading HP/Torque at the 6,000 & above RPM range. 
Most people with such a cam are using a Weber that allows for some pretty finite changes. It will be pretty difficult to guess at a SU needle that might be better.  
If you don't have access to a dyno there are any number of air/fuel ratio gauges on the market. I suspect you are simply running too rich at the bottom and lean at the top but this is all speculation unless you same a measure of it.  

Mini Mania Tech Team

The Classic Mini Parts and Accessories Experts

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