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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-761974@logan.com>
Subject: Re: [FlyRotary] Re: injector size
Date: Wed, 12 Oct 2005 07:48:29 +1000
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Ed,
Would he be better off trying a smaller primary, if that didn't work.
Tracy suggested smaller rather than larger primaries and I forget what RPM
the secondaries cut in, but feel it's fairly low RPM, so a smaller primary
wouldn't hurt.
George (down under)

> 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
> >
> > --
> > Homepage:  http://www.flyrotary.com/
> > Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> >
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
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>