VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 05-14-2020, 07:25 PM
azrv6's Avatar
azrv6 azrv6 is offline
 
Join Date: Mar 2006
Posts: 181
Default 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
__________________
Dave Binkley
RV-6, O-360-A1A, C/S
1932 Monocoupe 110, Warner 145 (http://gobinkley.com)
Sedona, AZ
Reply With Quote
  #2  
Old 05-14-2020, 08:57 PM
N941WR's Avatar
N941WR N941WR is offline
 
Join Date: Jan 2005
Location: SC
Posts: 12,887
Default

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.
Reply With Quote
  #3  
Old 05-15-2020, 06:32 AM
snopercod's Avatar
snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
Default

Quote:
Originally Posted by N941WR View Post
...the O-290 required a conical engine mount.
I had my O-290-D2 converted to Dynafocal, so it's possible.
__________________
(2020 dues paid)
Reply With Quote
  #4  
Old 05-15-2020, 06:49 AM
N941WR's Avatar
N941WR N941WR is offline
 
Join Date: Jan 2005
Location: SC
Posts: 12,887
Default

Quote:
Originally Posted by snopercod View Post
I had my O-290-D2 converted to Dynafocal, so it's possible.
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
Reply With Quote
  #5  
Old 05-15-2020, 02:57 PM
snopercod's Avatar
snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
Default

Don George in Orlando would know.
__________________
(2020 dues paid)
Reply With Quote
  #6  
Old 05-15-2020, 08:20 PM
Marc Bourget Marc Bourget is offline
 
Join Date: Apr 2009
Location: Stockton, California
Posts: 296
Default

I think the O-235 is lighter and may require a longer motor mount to maintain W&B range.
Reply With Quote
  #7  
Old 05-17-2020, 05:28 AM
robw891 robw891 is offline
 
Join Date: Oct 2011
Location: Smiths Falls
Posts: 8
Default

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
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 02:49 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.