Message-ID: <003901c44a51$967c6e40$0000a398@Carol>
From: "sqpilot@earthlink" <sqpilot@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-123470@logan.com>
Subject: Re: [FlyRotary] Re: Turbo boost limits in the EC2
Date: Fri, 4 Jun 2004 11:32:46 -0500
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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
>