REFLECTOR: low end idle speed

Douglas Holub douglas.holub at gmail.com
Thu Jan 15 12:04:28 CST 2009


Right. There's no more adjustment in the fuel system to slow the engine 
down.
----- Original Message ----- 
From: "Brian Michalk" <michalk at awpi.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Thursday, January 15, 2009 11:37 AM
Subject: Re: REFLECTOR: low end idle speed


> Maybe I don't understand what you mean by "won't idle".
> Pulling out on the throttle won't go below 950 RPM's?  Is that what you
> mean by mechanically?  I assume your idle stop on the throttle body is
> as far out as it will go.  There may be idle ports there you could play
> with.
>
> I understood you meant that the engine would die below 950 RPMs, and
> that's what my post was about.
>
> Douglas Holub wrote:
>> I set the unmetered fuel injection pressure at 11 psi at 950 RPMs per the
>> manual and conversations with the ECI test cell technician. There is no
>> rough idle. Pull the throttle out, smooth 950 RPMs. Slam the throttle in,
>> solid 100% power without a hiccup. Pretty cool.
>>
>> No magnetos, either. The Plasma III manual says that one can expect the 
>> idle
>> speed to increase up to 150 RPMs with electronic ignition, but I just
>> figured there would be a way to knock it back down to 800.
>>
>> Doug
>> ----- Original Message ----- 
>> From: "Brian Michalk" <michalk at awpi.com>
>> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>> Sent: Thursday, January 15, 2009 9:29 AM
>> Subject: Re: REFLECTOR: low end idle speed
>>
>>
>>
>>> Your magneto timing may be too aggressive for a hot cam at low RPM.
>>> It could also be a fueling issue.  What's the ECI fuel injection
>>> pressure at this RPM?  I would think related to poor atomization.  Do
>>> your EGT's go up appreciably from smooth idle to rough idle?  If this is
>>> it, I would think you would see a 30 to 50F change.
>>>
>>> No real adjustments for either of these problems.  But you can fiddle
>>> around with timing and fueling to diagnose which one is the problem.
>>> It's just that you wouldn't want to fly that way, especially retarded
>>> magneto timing would result in lower power in your power band.
>>>
>>> Douglas Holub wrote:
>>>
>>>> My ECI IOX-360 with dual Plasma IIIs won't idle less than 950 RPMs,
>>>> and I was expecting to get it down to 800. It runs smooth and strong
>>>> at all speeds. With full throttle I get 2320 static RPMs at 28.7 MAP
>>>> with the fixed pitch Prince 68/78 prop. I've calibrated the ECI fuel
>>>> injection using ECI's calibration kit. There's just no where to go
>>>> mechanically less than 950 RPMs.
>>>>
>>>> I remember from transition training that if I didn't pull the power
>>>> all the way back while landing, the Velocity would float forever down
>>>> the runway, but I don't remember what the low end idle speed was on
>>>> the factory trainer, and anyway, it had a constant speed prop. Am I
>>>> going to have any trouble landing at 950 RPMs?
>>>>
>>>> Doug Holub
>>>> ------------------------------------------------------------------------
>>>>
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>>
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>
> _______________________________________________
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>
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