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pulsair(at)mindspring.com
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 Posted: Tue Aug 19, 2008 6:04 pm Post subject: Free Wheeling Prop |
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What happens when you can turn the prop and it just keeps cycling and then about 100 rotations later you feel a little compression. It flies fine at high RPMS. My friend has a speedster with a 912 in it. Any thoughts, he is at his wits end. He is ready to pull the heads. Thanks. Jeff Classic IV KTZR
[quote][b]
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lcfitt(at)sbcglobal.net
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| Posted: Tue Aug 19, 2008 7:46 pm Post subject: Free Wheeling Prop |
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Jeff, had this happen to me once. We were on our way to Oshkosh and
stopped in wyoming for fuel. It was after fueling that the prop felt like a
turbine was behind it. One of our guys is a heavy machine maint. tech in
the mining industry of Nevada. His suggestion was a touch of Marvel Mystery
Oil so we went into town, but no luck finding it. As second best, he
suggested a couple of quarts of automatic transmission fluid, one in each
fuel tank.
After the mentioned 100 or so rotations, it came to life. We took an
evening flight around the countryside and never a problem since. I did have
one light cylinder from time to time before that. We thought it was
sticking valves. Incidentally, on cross country flights we were using
100LL. There have been several accounts of list members using Marvel
Mystery Oil from time to time. I always carried with me after that, but
never used it.
Lowell
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jdmcbean(at)kitfoxaircraf
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| Posted: Wed Aug 20, 2008 7:12 am Post subject: Free Wheeling Prop |
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Jeff,
Most likely stuck valves.. Lowell is correct, Marvels or some ATF… typically about 4-6 oz per 10 gallons.
Are you using TCP when using 100LL ? If not you may want to start. We have it in stock. The TCP is the lead scavenger.. the carrying agent is something very similar to Marvels.
Fly Safe !!
John & Debra McBean
Ph 208.337.5111
www.kitfoxaircraft.com
"The Sky is not the Limit... It's a Playground"
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of jeff puls
Sent: Tuesday, August 19, 2008 8:03 PM
To: kitfox-list(at)matronics.com
Subject: Free Wheeling Prop
What happens when you can turn the prop and it just keeps cycling and then about 100 rotations later you feel a little compression. It flies fine at high RPMS. My friend has a speedster with a 912 in it. Any thoughts, he is at his wits end. He is ready to pull the heads. Thanks. Jeff Classic IV KTZR
| Quote: | | http://www.matronics.com/Navigator?Kitfox-List |
0123456789
[quote][b]
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pwmac(at)sisna.com
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| Posted: Wed Aug 20, 2008 7:57 am Post subject: Free Wheeling Prop |
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Agree most likely the problem
On my C172 ('84) same issue I had it in the rental pool and nobody including the A&P said anything about a slight miss at idle until it was to late and a valve was burned badly. The engine was under warrantee and Lyc paid for the repair. When we looked at the other valves all showed erosion from the valves sticking open for quite some time. On disassembly lead deposits on the valve stems was the reason for sticking valves. Lyc said to continue the warrantee I would have to use their oil additive and cut the oil change intervals in half.
Sold the plane when it got time to replace the engine.
Conclusion: lead is bad.
Paul
=============
At 09:12 AM 8/20/2008, you wrote:
[quote] Jeff,
Most likely stuck valves.. Lowell is correct, Marvels or some ATF… typically about 4-6 oz per 10 gallons.
Are you using TCP when using 100LL ? If not you may want to start. We have it in stock. The TCP is the lead scavenger.. the carrying agent is something very similar to Marvels.
Fly Safe !!
John & Debra McBean
Ph 208.337.5111
[url=http://www.kitfoxaircraft.com /] www.kitfoxaircraft.com [/url]
"The Sky is not the Limit... It's a Playground"
From: owner-kitfox-list-server(at)matronics.com [ mailto:owner-kitfox-list-server(at)matronics.com (owner-kitfox-list-server(at)matronics.com)] On Behalf Of jeff puls
Sent: Tuesday, August 19, 2008 8:03 PM
To: kitfox-list(at)matronics.com
Subject: Free Wheeling Prop
What happens when you can turn the prop and it just keeps cycling and then about 100 rotations later you feel a little compression. It flies fine at high RPMS. My friend has a speedster with a 912 in it. Any thoughts, he is at his wits end. He is ready to pull the heads. Thanks. Jeff Classic IV KTZR
[b]
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pulsair(at)mindspring.com
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| Posted: Wed Aug 20, 2008 11:02 am Post subject: Free Wheeling Prop |
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Thanks John, we will give it a try. Jeff
[quote] ---
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pulsair(at)mindspring.com
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| Posted: Wed Aug 20, 2008 11:02 am Post subject: Free Wheeling Prop |
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Thanks Lowell. We will give it a try.
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