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Okanogan Lew
Joined: 22 Jul 2010
Posts: 45
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 Posted: Sun Oct 07, 2012 6:17 am Post subject: CJ6 prop reversal |
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Guys, during my last 5-6 flights, while shutting down the engine, twice it has reversed the direction & has turned 3-4 blades before stopping. Has anyone else had this experience & I wonder what is causing it & if there is damaged being done? I have flown about 60 hrs in this plane & this is the first time this has happened. I do run ethanol free auto fuel with occasional av gas & MMO. My shut down procedure is to run the engine up to 1600 rpm for about 15 secs, bring it to idle & turn off the mags. Should I be bringing the mixture to lean before shutting off the mags? This is a stock 285 HP engine, Thanks for any advice.
Paul Lewis
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okanoganlew(at)gmail.com
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| Posted: Sun Oct 07, 2012 7:13 am Post subject: CJ6 prop reversal |
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An important point I forgot, is that I do have the auto spark plug conversion.
Paul
On Sun, Oct 7, 2012 at 7:17 AM, Okanogan Lew <vplewis(at)community.org (vplewis(at)community.org)> wrote:
[quote]--> Yak-List message posted by: "Okanogan Lew" <vplewis(at)community.org (vplewis(at)community.org)>
Guys, during my last 5-6 flights, while shutting down the engine, twice it has reversed the direction & has turned 3-4 blades before stopping. Has anyone else had this experience & I wonder what is causing it & if there is damaged being done? I have flown about 60 hrs in this plane & this is the first time this has happened. I do run ethanol free auto fuel with occasional av gas & MMO. My shut down procedure is to run the engine up to 1600 rpm for about 15 secs, bring it to idle & turn off the mags. Should I be bringing the mixture to lean before shutting off the mags? This is a stock 285 HP engine, Thanks for any advice.
Paul Lewis
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384838#384838
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wlannon(at)shaw.ca
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| Posted: Sun Oct 07, 2012 10:11 am Post subject: CJ6 prop reversal |
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Paul;
Since there is no idle cut-off system in the carb. ignition cut-out is the only method available. This is basically the same process that I recall from the days of C65’s, etc. but with the advantage at least of a CHT guage.
The process I use for the Huosai or the M14P is Fine pitch, 1500 RPM for exactly one minute (time and RPM could vary but should be the same at each shut-down to facilitate oil scavenge and give a reliable basis for measuring oil consumption), Prop lever to coarse pitch, Wait for min. RPM and max. MP, Throttle to idle, Check for CHT below 140 deg.C, Switch off.
The Chinese manual adds another action which was standard and absolutely necessary in the C65 days. That is : Throttle slowly to full Open with switch closure.
I think your problem is not enough cylinder cooling time. Whether auto plugs would be more prone to after fire I don’t know.
Hope that helps;
Walt
From: Paul Lewis (okanoganlew(at)gmail.com)
Sent: Sunday, October 07, 2012 8:11 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: CJ6 prop reversal
An important point I forgot, is that I do have the auto spark plug conversion.
Paul
On Sun, Oct 7, 2012 at 7:17 AM, Okanogan Lew <vplewis(at)community.org (vplewis(at)community.org)> wrote:
[quote]--> Yak-List message posted by: "Okanogan Lew" <vplewis(at)community.org (vplewis(at)community.org)>
Guys, during my last 5-6 flights, while shutting down the engine, twice it has reversed the direction & has turned 3-4 blades before stopping. Has anyone else had this experience & I wonder what is causing it & if there is damaged being done? I have flown about 60 hrs in this plane & this is the first time this has happened. I do run ethanol free auto fuel with occasional av gas & MMO. My shut down procedure is to run the engine up to 1600 rpm for about 15 secs, bring it to idle & turn off the mags. Should I be bringing the mixture to lean before shutting off the mags? This is a stock 285 HP engine, Thanks for any advice.
Paul Lewis
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384838#384838
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wlannon(at)shaw.ca
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| Posted: Sun Oct 07, 2012 10:32 am Post subject: CJ6 prop reversal |
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A point that I forgot to mention: - Open gills for maximum cylinder cooling!
Walt
From: Paul Lewis (okanoganlew(at)gmail.com)
Sent: Sunday, October 07, 2012 8:11 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: CJ6 prop reversal
An important point I forgot, is that I do have the auto spark plug conversion.
Paul
On Sun, Oct 7, 2012 at 7:17 AM, Okanogan Lew <vplewis(at)community.org (vplewis(at)community.org)> wrote:
[quote]--> Yak-List message posted by: "Okanogan Lew" <vplewis(at)community.org (vplewis(at)community.org)>
Guys, during my last 5-6 flights, while shutting down the engine, twice it has reversed the direction & has turned 3-4 blades before stopping. Has anyone else had this experience & I wonder what is causing it & if there is damaged being done? I have flown about 60 hrs in this plane & this is the first time this has happened. I do run ethanol free auto fuel with occasional av gas & MMO. My shut down procedure is to run the engine up to 1600 rpm for about 15 secs, bring it to idle & turn off the mags. Should I be bringing the mixture to lean before shutting off the mags? This is a stock 285 HP engine, Thanks for any advice.
Paul Lewis
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384838#384838
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rget="_blank">http://www.matronics.com/Navigator?Yak-List
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href="http://forums.matronics.com">http://forums.matronics.com
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okanoganlew(at)gmail.com
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| Posted: Sun Oct 07, 2012 3:12 pm Post subject: CJ6 prop reversal |
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Thanks Walt, I pulled a plug (NGK BR5HS) & it looked black, but not oily or sooty.
Paul
On Sun, Oct 7, 2012 at 11:30 AM, Walter Lannon <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:
[quote] A point that I forgot to mention: - Open gills for maximum cylinder cooling!
Walt
From: Paul Lewis (okanoganlew(at)gmail.com)
Sent: Sunday, October 07, 2012 8:11 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: CJ6 prop reversal
An important point I forgot, is that I do have the auto spark plug conversion.
Paul
On Sun, Oct 7, 2012 at 7:17 AM, Okanogan Lew <vplewis(at)community.org (vplewis(at)community.org)> wrote:
| Quote: |
et="_blank">http://www.matronics.com/Navigator?Yak-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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[b]
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jackpot
Joined: 13 Jul 2010
Posts: 65
Location: Las Vegas, Nevada
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| Posted: Sun Oct 07, 2012 9:00 pm Post subject: CJ6 prop reversal |
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Paul, Gary Gabbard (CJ N22YK) here, I have a suggestion on the kick back problem. What is the RPM when you have the throttle closed and the idle stabilizes? If it is a low idle speed you might adjust the idle RPM up a 100 RPM. I have had engines that would kick back on shut down. By adjusting the idle up a little higher it stopped. Reason is that if the throttle plate in the carb. throat is completely closed it will cause fuel to be drawn up the intake by the low pressure in the intake manifold. By adjusting the idle up a bit it leaves the throttle plate a bit open and reduces the suction of fuel up into the cyls. No fuel, no kick back. It is worth a try. Let us know how it goes. Gary
Sent from my iPhone
On Oct 7, 2012, at 16:09, Paul Lewis <okanoganlew(at)gmail.com (okanoganlew(at)gmail.com)> wrote:
[quote]Thanks Walt, I pulled a plug (NGK BR5HS) & it looked black, but not oily or sooty.
Paul
On Sun, Oct 7, 2012 at 11:30 AM, Walter Lannon <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:
| Quote: | A point that I forgot to mention: - Open gills for maximum cylinder cooling!
Walt
From: Paul Lewis (okanoganlew(at)gmail.com)
Sent: Sunday, October 07, 2012 8:11 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: CJ6 prop reversal
An important point I forgot, is that I do have the auto spark plug conversion.
Paul
On Sun, Oct 7, 2012 at 7:17 AM, Okanogan Lew <vplewis(at)community.org (vplewis(at)community.org)> wrote:
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dsavarese0812(at)bellsout
Guest
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| Posted: Mon Oct 08, 2012 3:29 am Post subject: CJ6 prop reversal |
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Also, The BR5HS plugs are one heat range hotter than the ones I supply
in the automotive conversion kit, which are BR6HS's. The hotter plugs
(BR5HS) may be contributing to the issue in combination with the auto
fuel. Here is an excellent video explaining what "hot spark plug" versus
"cold spark plug".
http://www.youtube.com/watch?v=LbR75wq9nmM
Try changing back to the BR6HS plugs and gap them at .020 and see if the
problem goes away.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 10/7/2012 1:08 PM, Walter Lannon wrote:
| Quote: | Paul;
Since there is no idle cut-off system in the carb. ignition cut-out is
the only method available. This is basically the same process that I
recall from the days of C65’s, etc. but with the advantage at least of
a CHT guage.
The process I use for the Huosai or the M14P is Fine pitch, 1500 RPM
for exactly one minute (time and RPM could vary but should be the same
at each shut-down to facilitate oil scavenge and give a reliable basis
for measuring oil consumption), Prop lever to coarse pitch, Wait for
min. RPM and max. MP, Throttle to idle, Check for CHT below 140 deg.C,
Switch off.
The Chinese manual adds another action which was standard and
absolutely necessary in the C65 days. That is : Throttle slowly to
full Open with switch closure.
I think your problem is not enough cylinder cooling time. Whether auto
plugs would be more prone to after fire I don’t know.
Hope that helps;
Walt
*From:* Paul Lewis <mailto:okanoganlew(at)gmail.com>
*Sent:* Sunday, October 07, 2012 8:11 AM
*To:* yak-list(at)matronics.com <mailto:yak-list(at)matronics.com>
*Subject:* Re: CJ6 prop reversal
An important point I forgot, is that I do have the auto spark plug
conversion.
Paul
On Sun, Oct 7, 2012 at 7:17 AM, Okanogan Lew <vplewis(at)community.org
<mailto:vplewis(at)community.org>> wrote:
<vplewis(at)community.org <mailto:vplewis(at)community.org>>
Guys, during my last 5-6 flights, while shutting down the engine,
twice it has reversed the direction & has turned 3-4 blades before
stopping. Has anyone else had this experience & I wonder what is
causing it & if there is damaged being done? I have flown about 60
hrs in this plane & this is the first time this has happened. I do
run ethanol free auto fuel with occasional av gas & MMO. My shut
down procedure is to run the engine up to 1600 rpm for about 15
secs, bring it to idle & turn off the mags. Should I be bringing
the mixture to lean before shutting off the mags? This is a stock
285 HP engine, Thanks for any advice.
Paul Lewis
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384838#384838
===========
rget="_blank">http://www.matronics.com/Navigator?Yak-List
===========
http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
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href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
*
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okanoganlew(at)gmail.com
Guest
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| Posted: Mon Oct 08, 2012 6:27 am Post subject: CJ6 prop reversal |
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Dennis, I changed to the hotter plug because the originals looked black &
sooty. I will go back & see if that helps. Thanks.
Paul
On Mon, Oct 8, 2012 at 4:25 AM, A. Dennis Savarese <
dsavarese0812(at)bellsouth.net> wrote:
[quote]
dsavarese0812(at)bellsouth.net>
Also, The BR5HS plugs are one heat range hotter than the ones I supply in
the automotive conversion kit, which are BR6HS's. The hotter plugs (BR5HS)
may be contributing to the issue in combination with the auto fuel. Here is
an excellent video explaining what "hot spark plug" versus "cold spark
plug".
http://www.youtube.com/watch?**v=LbR75wq9nmM<http://www.youtube.com/watch?v=LbR75wq9nmM>
Try changing back to the BR6HS plugs and gap them at .020 and see if the
problem goes away.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 10/7/2012 1:08 PM, Walter Lannon wrote:
> Paul;
> Since there is no idle cut-off system in the carb. ignition cut-out is
> the only method available. This is basically the same process that I recall
> from the days of C65’s, etc. but with the advantage at least of a CHT guage.
> The process I use for the Huosai or the M14P is Fine pitch, 1500 RPM for
> exactly one minute (time and RPM could vary but should be the same at each
> shut-down to facilitate oil scavenge and give a reliable basis for
> measuring oil consumption), Prop lever to coarse pitch, Wait for min. RPM
> and max. MP, Throttle to idle, Check for CHT below 140 deg.C, Switch off
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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k7wx
Joined: 24 May 2010
Posts: 117
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| Posted: Mon Oct 08, 2012 7:27 am Post subject: CJ6 prop reversal |
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Paul,
At Dennis' suggestion, I went in the opposite direction from the BR7HS to the BR6HS with a 0.020 gag and the engine performed noticeably better.
Warren
On Oct 8, 2012, at 7:24 AM, Paul Lewis wrote:
[quote]Dennis, I changed to the hotter plug because the originals looked black & sooty. I will go back & see if that helps. Thanks.
Paul
On Mon, Oct 8, 2012 at 4:25 AM, A. Dennis Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> wrote:
| Quote: | --> Yak-List message posted by: "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)>
Also, The BR5HS plugs are one heat range hotter than the ones I supply in the automotive conversion kit, which are BR6HS's. The hotter plugs (BR5HS) may be contributing to the issue in combination with the auto fuel. Here is an excellent video explaining what "hot spark plug" versus "cold spark plug".
http://www.youtube.com/watch?v=LbR75wq9nmM
Try changing back to the BR6HS plugs and gap them at .020 and see if the problem goes away.
Dennis
A. Dennis Savarese
[url=tel:334-285-6263]334-285-6263[/url]
[url=tel:334-546-8182]334-546-8182[/url] (mobile)
www.yak-52.com
Skype - Yakguy1
On 10/7/2012 1:08 PM, Walter Lannon wrote:
| Quote: | Paul;
Since there is no idle cut-off system in the carb. ignition cut-out is the only method available. This is basically the same process that I recall from the days of C65’s, etc. but with the advantage at least of a CHT guage.
The process I use for the Huosai or the M14P is Fine pitch, 1500 RPM for exactly one minute (time and RPM could vary but should be the same at each shut-down to facilitate oil scavenge and give a reliable basis for measuring oil consumption), Prop lever to coarse pitch, Wait for min. RPM and max. MP, Throttle to idle, Check for CHT below 140 deg.C, Switch off.
The Chinese manual adds another action which was standard and absolutely necessary in the C65 days. That is : Throttle slowly to full Open with switch closure.
I think your problem is not enough cylinder cooling time. Whether auto plugs would be more prone to after fire I don’t know.
Hope that helps;
Walt
*From:* Paul Lewis <mailto:okanoganlew(at)gmail.com (okanoganlew(at)gmail.com)>
*Sent:* Sunday, October 07, 2012 8:11 AM
*To:* yak-list(at)matronics.com (yak-list(at)matronics.com) <mailto:yak-list(at)matronics.com (yak-list(at)matronics.com)>
*Subject:* Re: CJ6 prop reversal
An important point I forgot, is that I do have the auto spark plug conversion.
Paul
On Sun, Oct 7, 2012 at 7:17 AM, Okanogan Lew <vplewis(at)community.org (vplewis(at)community.org) <mailto:vplewis(at)community.org (vplewis(at)community.org)>> wrote:
--> Yak-List message posted by: "Okanogan Lew"
<vplewis(at)community.org (vplewis(at)community.org) <mailto:vplewis(at)community.org (vplewis(at)community.org)>>
Guys, during my last 5-6 flights, while shutting down the engine,
twice it has reversed the direction & has turned 3-4 blades before
stopping. Has anyone else had this experience & I wonder what is
causing it & if there is damaged being done? I have flown about 60
hrs in this plane & this is the first time this has happened. I do
run ethanol free auto fuel with occasional av gas & MMO. My shut
down procedure is to run the engine up to 1600 rpm for about 15
secs, bring it to idle & turn off the mags. Should I be bringing
the mixture to lean before shutting off the mags? This is a stock
285 HP engine, Thanks for any advice.
Paul Lewis
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384838#384838
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rget="_blank">http://www.matronics.com/Navigator?Yak-List
===========
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="_blank">http://www.matronics.com/contribution
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href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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dsavarese0812(at)bellsout
Guest
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| Posted: Mon Oct 08, 2012 7:47 am Post subject: CJ6 prop reversal |
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|
Black and sooty does not necessarily mean the plugs are too cold. It can
be caused by the mixture being too rich. On the CJ you have the
additional benefit of a mixture control.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1
On 10/8/2012 9:24 AM, Paul Lewis wrote:
| Quote: | Dennis, I changed to the hotter plug because the originals looked
black & sooty. I will go back & see if that helps. Thanks.
Paul
On Mon, Oct 8, 2012 at 4:25 AM, A. Dennis Savarese
<dsavarese0812(at)bellsouth.net <mailto:dsavarese0812(at)bellsouth.net>> wrote:
<dsavarese0812(at)bellsouth.net <mailto:dsavarese0812(at)bellsouth.net>>
Also, The BR5HS plugs are one heat range hotter than the ones I
supply in the automotive conversion kit, which are BR6HS's. The
hotter plugs (BR5HS) may be contributing to the issue in
combination with the auto fuel. Here is an excellent video
explaining what "hot spark plug" versus "cold spark plug".
http://www.youtube.com/watch?v=LbR75wq9nmM
Try changing back to the BR6HS plugs and gap them at .020 and see
if the problem goes away.
Dennis
A. Dennis Savarese
334-285-6263 <tel:334-285-6263>
334-546-8182 <tel:334-546-8182> (mobile)
www.yak-52.com <http://www.yak-52.com>
Skype - Yakguy1
On 10/7/2012 1:08 PM, Walter Lannon wrote:
Paul;
Since there is no idle cut-off system in the carb. ignition
cut-out is the only method available. This is basically the
same process that I recall from the days of C65’s, etc. but
with the advantage at least of a CHT guage.
The process I use for the Huosai or the M14P is Fine pitch,
1500 RPM for exactly one minute (time and RPM could vary but
should be the same at each shut-down to facilitate oil
scavenge and give a reliable basis for measuring oil
consumption), Prop lever to coarse pitch, Wait for min. RPM
and max. MP, Throttle to idle, Check for CHT below 140 deg.C,
Switch off.
The Chinese manual adds another action which was standard and
absolutely necessary in the C65 days. That is : Throttle
slowly to full Open with switch closure.
I think your problem is not enough cylinder cooling time.
Whether auto plugs would be more prone to after fire I don’t know.
Hope that helps;
Walt
*From:* Paul Lewis <mailto:okanoganlew(at)gmail.com
<mailto:okanoganlew(at)gmail.com>>
*Sent:* Sunday, October 07, 2012 8:11 AM
*To:* yak-list(at)matronics.com <mailto:yak-list(at)matronics.com>
<mailto:yak-list(at)matronics.com <mailto:yak-list(at)matronics.com>>
*Subject:* Re: CJ6 prop reversal
An important point I forgot, is that I do have the auto spark
plug conversion.
Paul
On Sun, Oct 7, 2012 at 7:17 AM, Okanogan Lew
<vplewis(at)community.org <mailto:vplewis(at)community.org>
<mailto:vplewis(at)community.org <mailto:vplewis(at)community.org>>>
wrote:
<vplewis(at)community.org <mailto:vplewis(at)community.org>
<mailto:vplewis(at)community.org <mailto:vplewis(at)community.org>>>
Guys, during my last 5-6 flights, while shutting down the engine,
twice it has reversed the direction & has turned 3-4 blades before
stopping. Has anyone else had this experience & I wonder what is
causing it & if there is damaged being done? I have flown about 60
hrs in this plane & this is the first time this has happened. I do
run ethanol free auto fuel with occasional av gas & MMO. My shut
down procedure is to run the engine up to 1600 rpm for about 15
secs, bring it to idle & turn off the mags. Should I be bringing
the mixture to lean before shutting off the mags? This is a stock
285 HP engine, Thanks for any advice.
Paul Lewis
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