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08-17-2016, 06:58 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Silly question.
Maybe a silly question, but are all 540 governors located on the front case of the engine?
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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08-17-2016, 09:09 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Quote:
Originally Posted by BillL
Maybe a silly question, but are all 540 governors located on the front case of the engine?
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I believe that is the case.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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08-17-2016, 10:30 AM
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Join Date: Jul 2015
Location: Omaha, NE
Posts: 63
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Now I have a silly question. Is the gov. Operating RPM different at the forward location compared to the rear mount? Bob
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08-17-2016, 12:29 PM
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Join Date: Jan 2014
Location: Cedar Rapids, IA / USA
Posts: 159
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Quote:
Originally Posted by Robertc
Now I have a silly question. Is the gov. Operating RPM different at the forward location compared to the rear mount? Bob
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Yes, while I'm no expert on governors I did have to learn a bit about drive ratios to make sure I ordered the right one for our narrow-deck IO-540.
The 6-cyls are all up front (I'm fairly certain at least, never seen one that isn't) and have either a .895:1 (narrow deck, slower) or .947:1 (wide deck, faster) drive ratio.
The 4-cyls can be either up front or in the back, and depending on location they have a different drive ratio as well. I *think* that if they are in back they are always .867:1 ratio, which is the slowest of all. Unless of course you have a "D" engine with the single-unit dual magneto, in which case it's the *fastest* of all at 1.30:1, or something like that. If the governor is located up front, I believe they follow the 6-cyl convention above.
So yeah, they all run at different speeds. Very confusing for a seemingly simple question! 
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Mike Jimenez & Sarah Hammonds
EAA Chapter 33 Prez & Soc Chair
Marion, IA USA
RV-10 In progress! (N165MJ reserved)
-Emp & Wings complete
-Panel wired up, working on Fuse & Finish
-Blog horribly outdated (sorry)
-Too many distractions, we will finish the plane someday!!!
http://mikeandsarahrv10.blogspot.com/
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08-17-2016, 01:21 PM
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Join Date: Sep 2008
Location: Buffalo Grove, IL
Posts: 7
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Mike is correct wide deck 540 is .947:1, narrow deck is .895:1, Lycoming 360 front mount governor is .947:1, rear mount is .866:1 or in some cases .850:1. Continental engines 1:1. The reason the propeller went to high pitch is when the flyweight came apart it jammed the pilot spool in the feed position. MT governors are made by Avia.
Sean O'Keefe
Project Manager
Aero Technologies, LLC
1-847-541-1133 ext 109
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08-17-2016, 01:42 PM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
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Has there been any report of failure of these MT governer that is mounted to a 360 (four cylinder) engine? Looks like they all have been on a 540.
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Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
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08-17-2016, 03:08 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Stock Lycoming or modified?
Does anyone know if the 4 engines that failed are Lycoming Clones with higher horsepower output than stock?
Vic
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 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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08-17-2016, 03:17 PM
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Join Date: Aug 2009
Location: Lexington, KY
Posts: 454
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Narrow vs wide deck
So will the MT P-860-3 governor work on both wide and narrow deck 540's?
Johan
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Dorfie
RV10 Flying, N245JM
2020 dues paid with a smile
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08-17-2016, 03:36 PM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Quote:
Originally Posted by vic syracuse
Does anyone know if the 4 engines that failed are Lycoming Clones with higher horsepower output than stock?
Vic
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Mine was a BPE rebuilt C4B5 that I was running as a D4A5.
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Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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08-17-2016, 04:44 PM
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Join Date: Sep 2007
Location: Mesa Arizona
Posts: 608
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Quote:
Originally Posted by Auburntsts
Mine was a BPE rebuilt C4B5 that I was running as a D4A5.
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Mine was also a BPE narrow deck that states "built to D4A5 specs".
I chose low compression 8.5 cylinders over future fuel concerns. I wanted a cruise motor, not a race motor. Data plate states 260 hp.
I seem to recall an issue years ago where Van's was shipping "narrow deck" PG's to wide deck owners who were being told to simply change the clocking.
__________________
Myron Nelson
Mesa, AZ
RV-10 N24EV
KITPLANES Contributing Editor
Last edited by woxofswa : 08-17-2016 at 04:47 PM.
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