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05-14-2020, 07:25 PM
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Join Date: Mar 2006
Posts: 181
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O-235, O-290, O-320 motor mount
Suppose you had a plane with an O-235 mounted on it. Would an O-290 and/or certain versions of the O-320 mount to the same motor mount?
Thanks,
Dave
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Dave Binkley
RV-6, O-360-A1A, C/S
1932 Monocoupe 110, Warner 145 ( http://gobinkley.com)
Sedona, AZ
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05-14-2020, 08:57 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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It depends.
My -9 started life with an O-290d2. The O-235 and 290 share the same length engine mount (approximately 12" from the firewall to the back of the engine mount ring). However, I believe the the O-320 mount is 2" shorter, but check with Van's. The mount for my replacement O-360 is the same as the O-320's mount, which is approximately 10" from the firewall to the back of the engine mounting ring.. Scott, can you verify?
The other catch is the O-290 required a conical engine mount. I don't know if all O-235's are conical or not. O-320's came with three different style isolation dampeners.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
Last edited by N941WR : 05-15-2020 at 09:16 PM.
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05-15-2020, 06:32 AM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
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Quote:
Originally Posted by N941WR
...the O-290 required a conical engine mount.
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I had my O-290-D2 converted to Dynafocal, so it's possible.
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(2020 dues paid)
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05-15-2020, 06:49 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by snopercod
I had my O-290-D2 converted to Dynafocal, so it's possible.
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Yes, you can have any engine case converted to a Dynafocal mount and it really doesn't cost that much. However, I believe it can't be done to an assembled engine, case halves only. I could be wrong here and would like to know if anyone will do it to an assembled engine.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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05-15-2020, 02:57 PM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
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Don George in Orlando would know.
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(2020 dues paid)
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05-15-2020, 08:20 PM
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Join Date: Apr 2009
Location: Stockton, California
Posts: 296
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I think the O-235 is lighter and may require a longer motor mount to maintain W&B range.
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05-17-2020, 05:28 AM
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Join Date: Oct 2011
Location: Smiths Falls
Posts: 8
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Per Bill's post, the O-235 motor mount is extended approximately 2" further out than the O-320 mount. I have the Vans O-235 engine mount (Type I, dynafocal) and originally had a O-235 L2C on my RV-9A. When I upgraded to an O-320-D2A, I reused the mount. I also reused all of the engine cowlings without modification (physical difference in engine size is minimal). The only major change was that I had to replace the intake air box as the O-320 carb is not in the same location as the O-235 - it's approximately 4" further forward and offset to the left ~1". I used a lighter prop and EarthX battery to save weight, and ended up losing 1 lb in overall weight from the conversion. C of G worked out perfectly - empty C of G went from 1062@79.3 to 1061@78.5.
__________________
Rob Walters
RV-9A
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