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Bill Schlatterer
Joined: 09 Jan 2006
Posts: 195
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 Posted: Sat Mar 01, 2008 3:49 pm Post subject: Clocking the prop ? |
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Just a little confused. I'm working on the prop spinner and mount and I hear folks talking about clocking the prop. Bill Boyd read something and had this to say:
"It says that a flat four engine will run more smoothly if the prop is indexed to be in the same plane as the crank pins, meaning it is horizontal when the pistons are at top or bottom dead center. This orientation is 60 degrees away from the indexing that is traditional for Lycomings, which is a concession to ease of hand-propping.
Well, I tried it and it works. The difference in smoothness was noticable from very first startup, and the engine is (subjectively) smoother at all rpm ranges. The prop now stops at about 1 o'clock position viewed from the front, as opposed to the traditional 10 o'clock position. "
Great, so now I am looking to mount my prop, New Hartzell BA on a O360. When I look at the prop flange, there is only one bolt that is not recessed. When I look at me crank flange, there are two bolts at 3 and 9 that will accept the unrecessed bolt. That means that I can put the prop at 3 or 9 (same orientation) but no place else. The TC mark on my flywheel is at 1 o'clock and I don't see any way to clock anything given these two flanges? Take a look.
<<...>> <<...>>
Am I missing something? Is there just one way to put the prop on this puppy?
Help appreciated.
Bill S
7a Ark sorta finishing
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g4mech(at)sbcglobal.net
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| Posted: Sat Mar 01, 2008 4:27 pm Post subject: Clocking the prop ? |
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Only one way my friend.
Mike
From: owner-rv7-list-server(at)matronics.com [mailto:owner-rv7-list-server(at)matronics.com] On Behalf Of Bill Schlatterer
Sent: Saturday, March 01, 2008 2:32 PM
To: rv7-list(at)matronics.com; RV7A(at)yahoogroups.com; rv-list(at)matronics.com
Subject: Clocking the prop ?
Just a little confused. I'm working on the prop spinner and mount and I hear folks talking about clocking the prop. Bill Boyd read something and had this to say:
"It says that a flat four engine will run more smoothly if the prop is indexed to be in the same plane as the crank pins, meaning it is horizontal when the pistons are at top or bottom dead center. This orientation is 60 degrees away from the indexing that is traditional for Lycomings, which is a concession to ease of hand-propping.
Well, I tried it and it works. The difference in smoothness was noticable from very first startup, and the engine is (subjectively) smoother at all rpm ranges. The prop now stops at about 1 o'clock position viewed from the front, as opposed to the traditional 10 o'clock position. "
Great, so now I am looking to mount my prop, New Hartzell BA on a O360. When I look at the prop flange, there is only one bolt that is not recessed. When I look at me crank flange, there are two bolts at 3 and 9 that will accept the unrecessed bolt. That means that I can put the prop at 3 or 9 (same orientation) but no place else. The TC mark on my flywheel is at 1 o'clock and I don't see any way to clock anything given these two flanges? Take a look.
<<...>> <<...>>
Am I missing something? Is there just one way to put the prop on this puppy?
Help appreciated.
Bill S
7a Ark sorta finishing [quote][b]
| | - The Matronics RV7-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:
http://www.matronics.com/Navigator?RV7-List |
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