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flying-nut(at)cfl.rr.com
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 Posted: Mon Apr 15, 2013 2:07 pm Post subject: IO540 hot starts |
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At Sun-n-Fun I was talking to Les Staples of SkyTech fame. He's developed a unit that he calls 'hot start' for his RV-10. Give him a shout at les (at) skytecair.com ...... remove the spaces.
Linn
On 4/15/2013 5:01 PM, lewgall(at)charter.net (lewgall(at)charter.net) wrote:
[quote] Hey Bill,
Â
Did anyone ask Jim about hot engine starts on the IO-540?  That has been addressed here, but with different styles from different folks. Just wondered if someone of his experience had a recommended technique.
Â
Later, – Lew
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om/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
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No virus found in this message.
Checked by AVG - www.avg.com
04/15/13 [b]
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robin(at)PaintTheWeb.com
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| Posted: Mon Apr 15, 2013 2:20 pm Post subject: IO540 hot starts |
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Aren't most Hot Start procedures a variation of:
Throttle / Prop Forward
Mixture Cut Off
Crank till you clear the cylinders and then slowly add Mixture?
Throttle back to 1000 RPM once firing enough to keep alive
Obviously there are variations such as a purge valve requires one to Mixture Cutoff then cycle cool fuel prior to cranking.
Let the Hot Start war begin.
Robin
From: owner-rv10-list-server(at)matronics.com [owner-rv10-list-server(at)matronics.com] on behalf of Linn [flying-nut(at)cfl.rr.com]
Sent: Monday, April 15, 2013 3:06 PM
To: rv10-list(at)matronics.com
Subject: IO540 hot starts
At Sun-n-Fun I was talking to Les Staples of SkyTech fame. He's developed a unit that he calls 'hot start' for his RV-10. Give him a shout at les (at) skytecair.com ...... remove the spaces.
Linn
On 4/15/2013 5:01 PM, lewgall(at)charter.net (lewgall(at)charter.net) wrote:
| Quote: | Hey Bill,
Did anyone ask Jim about hot engine starts on the IO-540? That has been addressed here, but with different styles from different folks. Just wondered if someone of his experience had a recommended technique.
Later, – Lew
| Quote: |
om/Navigator?RV10-List">http://www.matronics.com/Navigator?RV10-List
s.com">http://forums.matronics.com
om/contribution">http://www.matronics.com/contribution
|
No virus found in this message.
Checked by AVG - www.avg.com
04/15/13
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No virus found in this message.
Checked by AVG - www.avg.com
p>
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Mon Apr 15, 2013 7:01 pm Post subject: IO540 hot starts |
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Ugh. I hate full throttle start attempts. That is the heavily flooded procedure. Hazardous to your prop, hard on the engine.
No need in injected Lycomings I have flown. Do NOT use boost pump at all. Just 1/4" to 1/2" throttle, mixt. idle cutoff, prop full, crank 6 blades and if no fire, ease mixture slowly forward until it does fire. Been using that for the past 14 years in my Mooney with no issues.
On Mon, Apr 15, 2013 at 3:19 PM, Robin Marks <robin(at)painttheweb.com (robin(at)painttheweb.com)> wrote:
--
- sent from the microchip implanted in my forearm
[quote][b]
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Kelly McMullen
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robin(at)PaintTheWeb.com
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| Posted: Mon Apr 15, 2013 7:09 pm Post subject: IO540 hot starts |
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| Quote: | I'll give it a try. I don't care for fwf much either but has always worked. And I don't use boost Pump either.
Robin
Kelly McMullen <apilot2(at)gmail.com> wrote:
|
Ugh. I hate full throttle start attempts. That is the heavily flooded procedure. Hazardous to your prop, hard on the engine.
No need in injected Lycomings I have flown. Do NOT use boost pump at all. Just 1/4" to 1/2" throttle, mixt. idle cutoff, prop full, crank 6 blades and if no fire, ease mixture slowly forward until it does fire. Been using that for the past 14 years in my Mooney with no issues.
On Mon, Apr 15, 2013 at 3:19 PM, Robin Marks <robin(at)painttheweb.com (robin(at)painttheweb.com)> wrote:
--
- sent from the microchip implanted in my forearm
No virus found in this message.
Checked by AVG - www.avg.com
p>
[quote][b]
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Mauledriver(at)nc.rr.com
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| Posted: Tue Apr 16, 2013 5:35 am Post subject: IO540 hot starts |
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Kelly's procedure is exactly what I do for hot starts on my '10 (standard Vans IO540). Key points are cranking a bit until if fires then slowly feeding it fuel and not running the boost pump. I've played with turning on the fuel pump, without ever opening the mixture or throttle. That works too but it's seems to make no difference.
On cold starts, I 'prime' first by runnning the boost pump, open the mixture for a 5 count, then close mixture. Then same procedure with boost pump on throughout.
On 4/15/2013 11:00 PM, Kelly McMullen wrote:
[quote] Ugh. I hate full throttle start attempts. That is the heavily flooded procedure. Hazardous to your prop, hard on the engine.
No need in injected Lycomings I have flown. Do NOT use boost pump at all. Just 1/4" to 1/2" throttle, mixt. idle cutoff, prop full, crank 6 blades and if no fire, ease mixture slowly forward until it does fire. Been using that for the past 14 years in my Mooney with no issues.
[b]
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jkreidler
Joined: 13 Feb 2008
Posts: 151
Location: Sheboygan Falls WI
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| Posted: Wed Apr 17, 2013 4:22 am Post subject: Re: IO540 hot starts |
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Of course all of this is different if you have the Airflow Performance system and a purge valve. So just for a data point, since that is what we fly...
Cold start: Mixture full rich, throttle 1/8", purge valve full out (fuel being pumped back to the tanks), fuel pump on until fuel flow stabilizes. Purge valve full in for the count of 6, crank engine, after it fires purge valve full in.
Hot start: Mixture full rich, throttle half open, purge valve full out (hot fuel being pumped back to the tanks), fuel pump on until fuel flow stabilizes (be generous with the amount of time so you get cool fuel), purge valve in for the count of 2 (this is to fill the injector lines between the spider and the nozzles), purge valve out, crank engine, once it fires purge valve full in, retard throttle as the engine fully catches.
As I understand the function and purpose of the purge valve it falls into the "if you can't fix it, feature it" category. The mixture control valve on the Airflow Performance system at idle cut off does not fully cut fuel, so there is a chance you could still feed a super lean mixture of fuel to the injectors. So, they added the purge valve. I am not digging at all on the system, I really like it, it functions well, and the support is fantastic. Just pointing out the reason...
Thanks - Jason
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_________________
Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler
N44YH - Flying - #40617 |
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Wed Apr 17, 2013 6:26 am Post subject: IO540 hot starts |
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Keep in mind that there are at least two ways of installing the Airflow
system..purge valve dumps overboard, or connected back to fuel tank.
There are probably more variations. Each one will call for a different
technique.
There are arguments about benefits/costs/disadvantages to each system,
kind of like which primer to use/not use.
All I can say is I favor KISS, if a simple system works, I don't need a
more complicated system. Each builder is free to make their own choices,
which hopefully will be best for them and fulfill their objectives, but
may be all wrong for the next builder. Having this forum to share our
successes and, umm, less than outstanding choices is what it is all about.
Kelly
On 4/17/2013 5:22 AM, jkreidler wrote:
| Quote: |
Of course all of this is different if you have the Airflow Performance system and a purge valve. So just for a data point, since that is what we fly...
Cold start: Mixture full rich, throttle 1/8", purge valve full out (fuel being pumped back to the tanks), fuel pump on until fuel flow stabilizes. Purge valve full in for the count of 6, crank engine, after it fires purge valve full in.
Hot start: Mixture full rich, throttle half open, purge valve full out (hot fuel being pumped back to the tanks), fuel pump on until fuel flow stabilizes (be generous with the amount of time so you get cool fuel), purge valve in for the count of 2 (this is to fill the injector lines between the spider and the nozzles), purge valve out, crank engine, once it fires purge valve full in, retard throttle as the engine fully catches.
As I understand the function and purpose of the purge valve it falls into the "if you can't fix it, feature it" category. The mixture control valve on the Airflow Performance system at idle cut off does not fully cut fuel, so there is a chance you could still feed a super lean mixture of fuel to the injectors. So, they added the purge valve. I am not digging at all on the system, I really like it, it functions well, and the support is fantastic. Just pointing out the reason...
Thanks - Jason
--------
Jason Kreidler
4 Partner Build - Sheboygan Falls, WI
Tony Kolar, Kyle Hokel, Wayne Elser, Jason Kreidler
N44YH - Flying - #40617
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=398793#398793
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No virus found in this message.
Checked by AVG - www.avg.com
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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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