Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26477
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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