Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
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 Posted: Tue Oct 06, 2009 8:45 pm Post subject: Cable Routing With Front Mounted Governor... |
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Dear Listers,
I thought I'd share my experience installing the control cable on my IO-390 with a front mounted governor. I was quite perplexed with this task because the intake snorkel takes up most of the left baffle floor and there's not a lot of room for running a control cable for the governor down through the same area. A special bracket would unquestionably be required.
Since the McCauley governor I had was for a rear mount and not a front mount it had the wrong gear ratio (.866 to 1 rear vs .947 to 1 front), I had to order a replacement. A couple of Listers turned me onto the PCU5000 http://www.pcu5000.com/ which is similar in size and mounting to the MT that Van's sells but seems to have less problems with oil flow. I ordered it with the 947:1 gear ratio for the front mounted boss on the IO-390 and with a CLOCKWISE control rotation which means that the control arm turning clockwise *increases* the pitch. The part number for the PCU5000 mounted on an IO-390 is P-520-029/A-947 which can be found on their application chart here: http://www.pcu5000.com/pcu5000x.htm
I scratched my head for quite a while trying to figure out an elegant way of attaching the control cable. I made no less than three complicated brackets out of .063 trying to get the cable to come up from the bottom through the left floor. They mostly worked, but I just wasn't that happy with the operation and the fact that I would have drill a hole in the floor for the cable.
Then I started playing around with the standard VA-153-PC governor bracket and discovered that by drilling two new holes in the bracket in just the right location, I could run the control cable back over the engine and through the rear baffle. The best part is that the control action is really smooth and I'm getting full Max-to-Min travel!!
To orientate the bracket, I removed two screws from the governor at 12 o'clock and 2 o'clock positions. I placed the bracket on the governor and then rotated it counter-clockwise until it just hit the screw at the 10 o'clock position. I marked the two stock hole locations from the bracket onto the governor with a sharpie. I then took the rest of the screws out and with the cap on the work bench I put the bracket on the cap and realigned it with the two marks I had made earlier. Then, from the INSIDE of the cap, I marked the actual cap mounting holes onto the bracket with a sharpie. Over to the drill press to drill the two new marks on the bracket with a #19 drill and then reassemble the whole thing. As you can see from the photos, the alignment came out perfect.
The control cable I'm using is the standard length RV-10 prop governor cable and, at least for the RV-8, is the perfect size.
Best regards,
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's All New RV-8 Construction Blog
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