REFLECTOR: low end idle speed

[Brian Michalk]

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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