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pulsair(at)mindspring.com
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 Posted: Sun Jul 02, 2006 9:20 am Post subject: Shut Down Procedures |
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Clint,
What is your shut down procedure for the 912ULS? Will it work on a 912UL. Mine shakes on shutdown. I even have the shorter spacers in the engine mount. Jeff Classic IV 912UL
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clint_bazzill(at)hotmail.
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| Posted: Sun Jul 02, 2006 10:09 am Post subject: Shut Down Procedures |
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I have a complete startup procedure. First you have to understand why the engine shakes likes it does. The 912 engine was new and it ignition system was very simple, you start it with a retarted timing that is 6 degrees before top dead center. As the engine passes 1000 RPM's it jumps to 26 Degrees BTDC. There are no moving parts in the system and most of the time the engine is running with most of its power or getting ready to land or taxi. Here is the problem, the timing pulse that starts the engine fires in the retarted mode (that is the end of the pulse, but quickly jumps to 26 Deg BTDC. The 912 ULS or S does not want to get through that phase of starting and it is just about guaranteed to break something if you keep doing that. You have to have the engine on full idle to enrichen the mixture to start and thats the problem.
What you have to do is, have a charge of fuel in the cylinders ready to fire, and the throttle advanced to jump to at least 2000 RPm's or more. You can use a primer, I do not like this method as it puts raw fuel into the intake manifold and if the engine backfires, it could start a fire or at minimum kick the Carbs out of their boots.
My method for starting is as follows: Set the engine to full idle. Keep the ign's off pull full choke and crank the engine for 5 seconds. If you have a veneer throttle adjust it for about 1 1/2 turns in. Wait one full minute and crank engine. Almost every single time it starts with a bang. If, If it starts shaking (shut it down immediately) wait 1 minute and restart.
On shut down, simple (I run the engine to about 3000 RPM's cut the ign switches and quickly pull the throttle back to idle. I do think that cutting the spacers on the shock mounts on engine was a very big mistake. If Shorting them worked, then why not just take them out.
I just had my Prop reduction unit returned to Lockwood for maintance (they recommend it at 300 hours) I know why. I have almost 800 hours on this unit, Kary (not sure of spelling) asked me what I have been doing with this unit. He said it looked as if it were a brand new unit, and what ever it was keep on doing it.
I have a complete write up for starting and shutting down the engine which I can put on the Internet if people are interested.
If I'm not mistaken, most of the Guys in the Desert Fox Squadron use this procedure. I had the carbs come off once in Tracy, about 70 miles away. I towed the aircraft home, worked on procedure, and it seems to work perfect. The first time you use this procedure you won't believe how simple and smooth it is. Clint
300 hours on 912UL, over 800 on 912ULS. No broken engine mounts, no broken muffler, My kit was purchased in Aug 1993. I think that was the first or one of the first to use a 912ULS in a Model IV-1200.
If you would like to talk about this, feel free to call anytime. I live on the coast near Half Moon Bay, Calif (650 712 1802
| Quote: | Clint,
What is your shut down procedure for the 912ULS? Will it work on a 912UL. Mine shakes on shutdown. I even have the shorter spacers in the engine mount. Jeff Classic IV 912UL
|
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rjdaugh(at)rapidnet.com
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| Posted: Tue Jul 04, 2006 7:38 pm Post subject: Shut Down Procedures |
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Jeff, and other 912 drivers,
I have been using Clint’s procedure for nearly two years, and it is great!
Works in 20 degree weather and in 98 degree weather – engine hot or cold.
If the engine is warm, I don’t use the choke in the pre-oil step.
Clint, I do think you should put your procedure on Sport Fllight and on the
Desert Fox squadron site.
Randy
.
________________________________________
[mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Clint Bazzill
Sent: Sunday, July 02, 2006 12:08 PM
I have a complete startup procedure. First you have to understand why the
engine shakes likes it does. The 912 engine was new and it ignition system
was very simple, you start it with a retarted timing that is 6 degrees
before top dead center. As the engine passes 1000 RPM's it jumps to 26
Degrees BTDC. There are no moving parts in the system and most of the time
the engine is running with most of its power or getting ready to land or
taxi. Here is the problem, the timing pulse that starts the engine fires in
the retarted mode (that is the end of the pulse, but quickly jumps to 26 Deg
BTDC. The 912 ULS or S does not want to get through that phase of starting
and it is just about guaranteed to break something if you keep doing that.
You have to have the engine on full idle to enrichen the mixture to start
and thats the problem.
What you have to do is, have a charge of fuel in the cylinders ready to
fire, and the throttle advanced to jump to at least 2000 RPm's or more. You
can use a primer, I do not like this method as it puts raw fuel into the
intake manifold and if the engine backfires, it could start a fire or at
minimum kick the Carbs out of their boots.
My method for starting is as follows: Set the engine to full idle. Keep
the ign's off pull full choke and crank the engine for 5 seconds. If you
have a veneer throttle adjust it for about 1 1/2 turns in. Wait one full
minute and crank engine. Almost every single time it starts with a bang.
If, If it starts shaking (shut it down immediately) wait 1 minute and
restart.
On shut down, simple (I run the engine to about 3000 RPM's cut the ign
switches and quickly pull the throttle back to idle. I do think that
cutting the spacers on the shock mounts on engine was a very big mistake.
If Shorting them worked, then why not just take them out.
I just had my Prop reduction unit returned to Lockwood for maintance (they
recommend it at 300 hours) I know why. I have almost 800 hours on this
unit, Kary (not sure of spelling) asked me what I have been doing with this
unit. He said it looked as if it were a brand new unit, and what ever it
was keep on doing it.
I have a complete write up for starting and shutting down the engine which I
can put on the Internet if people are interested.
If I'm not mistaken, most of the Guys in the Desert Fox Squadron use this
procedure. I had the carbs come off once in Tracy, about 70 miles away. I
towed the aircraft home, worked on procedure, and it seems to work perfect.
The first time you use this procedure you won't believe how simple and
smooth it is. Clint
300 hours on 912UL, over 800 on 912ULS. No broken engine mounts, no broken
muffler, My kit was purchased in Aug 1993. I think that was the first or
one of the first to use a 912ULS in a Model IV-1200.
If you would like to talk about this, feel free to call anytime. I live on
the coast near Half Moon Bay, Calif (650 712 1802
________________________________________
Clint,
What is your shut down procedure for the 912ULS? Will it work on a 912UL.
Mine shakes on shutdown. I even have the shorter spacers in the engine
mount. Jeff Classic IV 912UL
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