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Thanks Ed,
I did something simmilar to what you suggested. I had the fuel pumps off , and than with the starter engaged I turned on the pump. The engine sputtered and got going most of the time. So it leads me to believe there was an large dump of fuel right at the start that was flooding the spark plugs.
Hope Tracy will explain all that at our gathering at Rotary Mecca :)
Buly
From: "Ed Anderson" <eanderson@carolina.rr.com>
Date: 2005/10/11 Tue PM 04:47:09 EDT
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: injector size
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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