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kahamer(at)bigpond.net.au
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 Posted: Tue Jul 22, 2008 4:06 am Post subject: MT Governor |
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Hi all,
I wonder if anyone else has experienced the following problem with the MT Governor:
Engine RPM on take off will reach 2780 if power is not applied VERY slowly.
On engine run up the governor reacts much slower(somewhat delayed) than the Woodward governor I used the have in my previous RV (same engine model and prop)
In flight max rpm is 2670 at full throttle ,but throttling back in level flight and reapplying power will also cause overspeeding for a brief moment.
With hot engine oil the problem on take off seems to almost go away (can apply power more quickly)
Had latest modification done by MT,which improved things slightly.
The current set up is as follows:
RV7A
O-360-A1A 35hours
Hartzell prop 35 hours
MT governor
Running Shell 100 straight mineral oil for running engine in.
To me it looks like as if the governor can not change the oil pressure quick enough to keep constant rpm.
Maybe it will be better when switching to multigrade engine oil eventually.
Any ideas what could cause this?
Regards
Karl Ahamer
7A VH-KAX near Sydney/Australia
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lessdragprod(at)AOL.COM
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| Posted: Tue Jul 22, 2008 7:28 am Post subject: MT Governor |
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Hi All,
Some of these comments are general comments and do not apply to the stated problem. They do apply to situations that have already happened.
The CS propeller typically operates with about 150 psi oil pressure in the hub.
The MT Governor is tested at the factory and the inspection data is shipped with the governor. You should see that the governor is tested at 375 psi with a flow rate 8 quarts per minute. That's a flow rate of 120 gallons per hour.
The governor requires an inlet pressure of 15 psi to function properly.
It would seem that there is a restriction in the oil flow path.
Places to check.
The governor can have an extrenal cover AND two small plastic plugs in the base. Make certain they are all removed.
The propeller hub normaly has a plastic dust cover stuck in the back. If this is left in place, it will restrict the oil flow. After the propeller has been installed with plastic plug in place, it is difficult to see inside the hub bore. At least one propeller has been removed and inspected for the plug, only to remove the propeller as second time to actually remove the plug.
(I don't have to make these mistakes myself. I can let other people do it for me. This really saves me a great deal of time, in the long run.)
There could also be a flow restriction between the governor and the propeller. (A piece of rag?) I don't know an easy way to inspect for this. Or a restriction in the oil hose when manufactured. Shouldn't be an issue with a SST line. I don't remember what's required now.
Regards,
Jim Ayers
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Gary.A.Sobek
Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA
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| Posted: Tue Jul 22, 2008 10:42 am Post subject: MT Governor |
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Recently a local RV'er constant speed prop would not cycle. He checked oil pressure to the governor like Jim is suggesting IAW (In Accordance With) Lycoming Service Instruction SI-1462A. http://www.lycoming.textron.com/support/publications/service-instructions/pdfs/SI1462A.pdf
When the Lycoming Propeller Oil Control Leak Test Procedure listed above failed C the prop was pulled. The PLUG behind the prop in the crankshaft that is REQUIRED for constant speed operation was not seated.
The RV'er above had his engine overhauled 600 hours earlier and the prop worked. One day C it went to high RPM and would not cycle.
None of our local experts (myself included) thought of checking this. This leak check was suggested by Barrett Precision Engines and they found the problem troubleshooting long distance.
Gary A. Sobek
"My Sanity" RV-6 N157GS O-320 Hartzell C
2 C129 + Flying Hours So. CA C USA
To: rv-list(at)matronics.com
Subject: Re: MT Governor
Date: Tue C 22 Jul 2008 11:22:15 -0400
From: lessdragprod(at)aol.com
Hi All C
Some of these comments are general comments and do not apply to the stated problem. They do apply to situations that have already happened.
The CS propeller typically operates with about 150 psi oil pressure in the hub.
The MT Governor is tested at the factory and the inspection data is shipped with the governor. You should see that the governor is tested at 375 psi with a flow rate 8 quarts per minute. That's a flow rate of 120 gallons per hour.
The governor requires an inlet pressure of 15 psi to function properly.
It would seem that there is a restriction in the oil flow path.
Places to check.
The governor can have an extrenal cover AND two small plastic plugs in the base. Make certain they are all removed.
The propeller hub normaly has a plastic dust cover stuck in the back. If this is left in place C it will restrict the oil flow. After the propeller has been installed with plastic plug in place C it is difficult to see inside the hub bore. At least one propeller has been removed and inspected for the plug C only to remove the propeller as second time to actually remove the plug.
(I don't have to make these mistakes myself. I can let other people do it for me. This really saves me a great deal of time C in the long run.)
There could also be a flow restriction between the governor and the propeller. (A piece of rag?) I don't know an easy way to inspect for this. Or a restriction in the oil hose when manufactured. Shouldn't be an issue with a SST line. I don't remember what's required now.
Regards C
Jim Ayers
--
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altoq(at)cebridge.net
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| Posted: Tue Jul 22, 2008 11:09 am Post subject: MT Governor |
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I'm not a builder but check out this web site
http://www.sacskyranch.com/eng41.htm
[quote]
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I wonder if anyone else has experienced the following problem with the MT Governor:
Engine RPM on take off will reach 2780 if power is not applied VERY slowly.
On engine run up the governor reacts much slower(somewhat delayed) than the Woodward governor I used the have in my previous RV (same engine model and prop)
In flight max rpm is 2670 at full throttle ,but throttling back in level flight and reapplying power will also cause overspeeding for a brief moment.
With hot engine oil the problem on take off seems to almost go away (can apply power more quickly)
Had latest modification done by MT,which improved things slightly.
The current set up is as follows:
RV7A
O-360-A1A 35hours
Hartzell prop 35 hours
MT governor
Running Shell 100 straight mineral oil for running engine in.
To me it looks like as if the governor can not change the oil pressure quick enough to keep constant rpm.
Maybe it will be better when switching to multigrade engine oil eventually.
Any ideas what could cause this?
Regards
Karl Ahamer
7A VH-KAX near Sydney/Australia
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