Greetings,

 

The following is my log from today.  Suffice it to say that I'm pretty disgusted.  Based on the number on my secondary injectors, it does appear that they should be 50 lb/hr (525 cc/min) injectors.  That should be pretty close to the stock 550's I would think, but they sure don't act like it.  FWIW, they are MSD-2013 injectors, which are actually made by Rochester as a #17104487. 

 

Rusty (Maybe beer will help <g>)

 

 Rusty;

 

I am using 3 MSD 2013’s (525 cc/min) as secondaries, and 3 of the stock 20B sidefeed injectors in the primaries.  The primaries are the purple ones that I thought were 550 cc/min, but RC engineering flow tests showed them to be 570 cc/min at 43 psig.

 

I did not have too much trouble getting the engine to run right over the entire MAP range with the EC-2.  Started right up on the default settings.  Spent some time doing fine adjustment across the staging point.

 

Overall, I had to make large lean correction at low MAP (below stage point); things were about right at intermediate MAP, and made rich correction at high MAP.  I learned later the default mapping assumes MAP referenced fuel pressure, and I had a constant pressure regulator set at 40 psi; so this pattern makes sense.

 

I had a problem with the engine dying after pulling the throttle back when it went to a MAP pressure below where I was able to run and make the big correction.  This is influenced by the large primaries, but I believe will be solved by going to a MAP referenced regulator.

 

This won’t help you solve the problem, but I think shows that the mismatch of the injectors is not an issue beyond the need for some careful adjustment at the staging point.

 

Al