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----- Original Message -----
From: "Mike Robert" <pmrobert@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, June 04, 2004 6:38 AM
Subject: [FlyRotary] Re: Turbo boost limits in the EC2
John Slade wrote:
>>Cutting fuel till the MAP comes down is the only workable solution I can
>>see.
>>
>>
>Yes, I tend to agree. Tracy - are you listening? Does this make sense to
>you?
>Anyone else care to comment? I'd really like to get something built into
the
>EC2....soon.
>Regards,
>John
>
>
>
>
>>>
>>>
Again, - I'm speaking auto use - you have to be very careful using fuel
cut in a boosted rotary, all it takes is a couple of hard knocks
instigated by a transient lean condition to break apex seals. There's
plenty of fuel coating the inside of the manifold, etc., to do this even
if you shut the injectors completely off. It's a very short phenemenon
but it is there. Another thing - hard fuel cuts are scary in a car, I
would imagine the soiled underwear factor is quite a bit higher while
flying when you hit cut. I use hard fuel cut as a rev limiter in my NA
and it STILL gets my attention. That said, I believe Tracy's ECU manages
spark as well as fuel. Random spark cut and/or massive retard may be the
way to cut your boost in those temporary situations.
-Mike
Hi, Mike....my concern is that if you cut spark, and still have fuel going
into the engine, you may end up with a flooded engine, or worse yet, a
terrific backfire due to the excessive fuel build-up then reintroducing
spark. I used to take my 1960 Ford, coast down a large hill with the
ignition off (standard transmission in gear), then turn the key back on, and
scare everyone with the loud backfire. Did that until I blew my muffler
right down the seam one day. Got too expensive for a 16 year-old (expensive
firecrackers). Just another consideration. Paul Conner, MicroTech ECU with
fuel cut boost limiter.
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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