Buly,  Something you might try is setting the staging manifold pressure point at a higher manifold pressure.  That way your 550c primary should be the only ones on at low and even medium rpms and since the Ec2 appears to work fine with 550s out of the box, this might help. Since you have already gone the mode 3 route, this is the only thing I can think of.

I believe the problem is that upon initial start,  the EC2 sees ambient pressure in the manifold (30"Hg) and thinks the engine is wide open throttle, it checks the fuel map for the amount of fuel to inject for MAP = 30"Hg and  injects fuel (a lot!) accordingly.  Normally, this is not a problem as the engine immediately starts and  sucks the manifold pressure down to the nominal 12-14" Hg (for idle) and the fuel injected is adjust accordingly AND the secondary are turned off (until the manifold pressure again rises to the staging point), but with your big injectors having all four dump fuel before the engine is started and running is probably contributing to the problem.

Do you have switches on your injectors and have you tried starting with the secondary injectors turned off??

I presume you don't have the cold start turned on (accidentally or otherwise -shorted).

I presume you have programmed a lean mixture for start up region .

Ed A



----- Original Message ----- From: "Bulent Aliev" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, October 11, 2005 4:15 PM
Subject: [FlyRotary] injector size

Hi Guys,
For the last few months I have been struggling with engine flooding  on start up.  Looking at the EC2 manual, it tells me that it comes  pre-set for "standard" Mazda injectors. I checked the injector charts  and most of the Mazdas have 460 or 550 CC injectors for primary and  secondary. My engine (Cosmo 13B) comes with 550 cc primary and 850 cc  secondary.

I did some Mode3 adjustment on the EC-2 and looks like it's a bit  better, but the trailing plugs get wet if it does not start right away?
Any Ideas?
Buly

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