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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
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 Posted: Sun Sep 20, 2009 11:04 am Post subject: Front Mounted Governor vs. Rear Mounted Governor... |
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I just discovered something very interesting. The gear ratio is different between a Front mounted governor and a Rear mounted governor - .947 to 1 (front) vs. .866 to 1 (rear). So that means that the McCauley governor that I have that I originally purchased for use with and O-360 won't even work with the IO-390. This page from the PCU5000 web site is very informative:
http://www.pcu5000.com/pcu5000x.htm
It details the various ratios and what not.
I also found a PDF on the dimensions of the MT governor that Van's sells:
http://www.mt-propeller.com/pdf/manuals/e-1048.pdf
This MT governor is also 1" shorter than the McCauley governor similar to the PCU5000:
http://www.pcu5000.com/pcu5000x_spec.pdf
In this picture of the PCU5000:
http://www.pcu5000.com/index_i/hmpg_pic.gif
the PCU5000 shows an auxiliary control arm that might be very helpful in pushing the control cable out of the way of the fiberglass intake. Although, I think that just moving the control arm in by 1" compared to the McCauley is going to be plenty.
At any rate, I've ordered a PCU5000X number "P-520-029/A-947" for my RV-8/IO-390 combination so hopefully I can move forward on this project...
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com
Engine Baffling...
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Matt Dralle
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wgill10(at)comcast.net
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| Posted: Sun Sep 20, 2009 7:22 pm Post subject: Front Mounted Governor vs. Rear Mounted Governor... |
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Hello Matt,
I installed the offset arm as well, but found that I needed an additional 0.5 inch offset -- fabicated from .5 inch aluminum stock. You might find the attached photos helpful.
Best regards,
Bill
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
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| Posted: Mon Sep 21, 2009 2:00 pm Post subject: Re: Front Mounted Governor vs. Rear Mounted Governor... |
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Great pictures, Bill; thank you!
I just ordered a PCU5000 with the extension arm and the clockwise rotation (clockwise to increase pitch).
What length control cable did you use?
If you had made your bracket stick out a little farther, could you have gotten away with not using the extra bushing on the control arm?
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com
Engine Baffling & Governor Installation...
| | - The Matronics RV-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?RV-List |
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Matt Dralle
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