factory 483 #26 Posted June 21, 2017 23 hours ago, Ghosty said: David, Thank you for the photos, that one looks like a piece of extruded alloy, the other one that I have seen is a cast one. Looks like I will just machine one out of a block alloy. Photo is just one engine I have built over the years. Yes the pictures I added are of the extruded version, I thought it would be good to add them as there wasn't any pictures in this thread. I will take some pictures of my cast mount (removed from the engine) and get some measurements at the weekend if you still need them. I'm guessing you won't have any trouble making one. That is a very nice engine, how big is it compared with the O&R? David Share this post Link to post Share on other sites
Ghosty 3 #27 Posted June 21, 2017 (edited) David, Thank you, I would like the photos and dimensions of the cast mount if you can do it. I have added a photo of the two engines together so you can size it. Each cylinder is approx. 25cc Cheers Andrew Edited June 21, 2017 by Ghosty Added size Share this post Link to post Share on other sites
factory 483 #28 Posted June 24, 2017 Hi Andrew The 3/4HP O&R has a cylinder of approx 20.6cc and the 1HP O&R is approx 22cc. I've taken lots of pictures of my Octura Mount and created a DaveCAD sketch/drawing of the mount with lots of measurements (note the sides of mine are not flat), I've also added a scan of the O&R engine dimensions with the correct dimensions for the spacing of the mounting screws (#8x32 UNC used on my Octura mount). O&R engine dimensions; Higher resolution pdf of the O&R engine dimensions; Ohlsson & Rice Engine Dimensions.pdf Sketch of Octura Mount; Higher resolution pdf of the Octura Mount sketch; Octura Models O&R Engine Mount.pdf David Share this post Link to post Share on other sites
factory 483 #29 Posted June 24, 2017 Here are the pictures of my Octura Mount (cast version), note that one mounting lug is missing; Here are a few extra pictures of the Octura Mount with a damaged O&R crankcase I had lying around, so you can see how they line up; If there is anything I've missed let me know. David Share this post Link to post Share on other sites
factory 483 #30 Posted June 24, 2017 I thought I would add a few pictures my O&R engine with the Octura Mount, unfortunately someone has made a bit of a mess of the pipes on the cylinder, they didn't even remove anything from the engine when they did it, you can see splashes of the solder? inside the starter housing! David Share this post Link to post Share on other sites
Ghosty 3 #31 Posted June 28, 2017 David, Thank you very much for the reply, sorry for the delay, just spent the last 6 days in hospital with heart problems. Cheers Andrew Share this post Link to post Share on other sites
Ghosty 3 #32 Posted July 2, 2017 Quote While I still can't do a lot, I have done the basic layout for the start of the machining of the engine mount, sourced a block of 2" alloy bar stock. Will make the mount to suite the 48" hull. I found a supplier for the ply to build the hydroplane, looking at just over $130 for the ply, but he wanted over $400 for freight, so I decided on a 48" mono hull that I picked up very cheep in kit form. Cheers Andrew Share this post Link to post Share on other sites
factory 483 #33 Posted July 2, 2017 Looks like a you've made a good start. I've had health problems for the last two years (not as serious though) so it has been taking me longer to do anything, including restoring my O&R's. David Share this post Link to post Share on other sites
Ghosty 3 #34 Posted July 6, 2017 Hi All, David, I got the mount machined up, still need some end plates made up(waiting on material), have trial fitted to the hull. Cheers Andrew 1 factory reacted to this Share this post Link to post Share on other sites
