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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-762110@logan.com>
Subject: Re: [FlyRotary] Re: injector size
Date: Tue, 11 Oct 2005 19:33:48 -0400
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No question, George, smaller injectors generally give better low rpm idle. 
However, I believe that Buly wants to try to make his current setup work 
before trying that.

Ed A
----- Original Message ----- 
From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, October 11, 2005 5:48 PM
Subject: [FlyRotary] Re: injector size


> 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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>>
>
>
>
> --
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