orange

A friend of mine is running a 13b PP using an electronic dissy, with the leading spark coming from an MSD 64 unit. It is the first time I've seen this set up, with the dissy sparking the trailing and the MSD sparking the leading. I'm not entirely sure what is envolved in this setup but it gave him an increase of 11kW. Does this sound correct?

He also said that the locked the dissy has been locked!



Does any one use this this method, if so, is there anything else involved?



How do you go about locking the dissy, are their any links?

Lynn E. Hanover

We use an MSD 6-AL with the built in rev limiter, on both leading and trailing. Both fire from the leading pickup in the electronic distributor. There is no advance system. The weights and springs are removed and the upper plate is moved to the full advance position and brazed in two little spots (so you can change your mind later).



Total advance is 25-27 degrees for a bridgeported 12A.



The MSDs just replace the stock amplifier (points eliminator).



Above about 3,000 RPM the MSD is just a killer capaciter discharge system. At starting and low speeds it fires up to 40 times per cycle, and the first of those is an outstanding event. It is good to remember that it fires once when turned on and that first shot will reach through the plug boot looking for your wrist watch.





Lynn E. Hanover





Picture is ace driver overcooking a corner. Note the oversteer position of the front tires.

Lynn E. Hanover

howracer

note the positive camber in the rear tire.....



naughty naughty



your pal



howard coleman

Jeff20B

Lynn, you say both leading and trailing fire from the leading pickup? Did you have to shave two teeth from the reluctor?

Lynn E. Hanover

Well, it starts off as 1/2 a degree of negative camber and 1/4 degree of toein.



The fronts start at about 1/4 on the right side and 1/2 on the left side then may be adjusted based on tire temps.



The car was working real good. But we broke the rear end and did not make the start.



Daryl was shooting his radar gun on the straight and congratulated me on my engine. Made the week for me.





Lynn E. Hanover

Lynn E. Hanover

No.



Note that the pickups are mounted 90 degrees apart around the reluctor.



So, both pickups energize at about (minus any degrees of split for trailing) the same time anyway. The funny rotor button keeps it sorted out. Just try it. It works fine.



Lynn E. Hanover

Jeff20B

Oh, so you're running through the cap and rotor then. I assumed you went direct fire.

orange

Cheers for the help Lynn, much appreciated.

Lynn E. Hanover

I had one setup that involves a single reluctor on the front pulley/degree wheel, and two pickups 180 degrees apart on the front cover. One fires a double ended coil for the front housing and the other fires the rear housing. They were Oldsmobile coils I think. I found one on a shelf and was thinking about going back to it. No particular advantage over the distributor, unless you need that space for something else. Like an alternator.

Rock solid timing, but without the advance weights the distributor is rock solid in the RPMs we need.



In another post I said that the two pickups are 90 degrees apart in the electronic distributor. This is not the case. If they were at 90 degrees the outcome would be the same. both pickups are triggered at about the same time.



For the record......the pickups are 180 degrees apart and are triggered at about the same time less whatever offset for trailing timing if any.





Lynn E. Hanover