Original plans allowed for use of O-200
Van's original RV-3 plans allowed for a Lycoming engine or a Continentel O-200 configuration. The plans modified the cockpit seat pan and engine mounts (not only mount, but dimension changes) if I remember correctly.
There have been several O-200 powered -3's built, but I have not actually seen any of them first hand. I have a picture and an RVator wright up of one if you are interested.
If you are interested in seeing the modified plans for the lighter O-200 engine let me know. It would most likely have to have further mods for the Jabiru but would give you some known starting points.
You can find a 0235 C series engine core for 1500-3000. With a premo
overhaul including new Lycoming cylinders and Cam you will have less
than 15K maybe 12-13K and have for all practical purposes a "New"
engine good for 2400 hours TBO. I have such a engine in my RV3 that
was overhauled like I just described to use in my Colt about 400 hours
ago. The only cooling problem I have with my installation is the oil
temp is hard to get up enough to boil off the moisture from the engine.
I have yet to see more than 180 degrees with the oil cooler blocked off.
Pictures of my RV3b with the corvair engine is on the RV3 registry and also on Van's web site, click on the first flights.
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