With the rather exotic exhaust system Gary Wolf and I dreamt up for this engine, William Wynnes typical bed mount system was not going to fit the bill, so I have designed a more aircraft type mount, using Lycoming 235 homebuilt rubbers. As shown on the following photos, there are relatively heavy duty aluminum brackets attached to the block that will mount the block to conventional aircraft engine mount hardware.
The bottom rails (which will be lightened) bolt to the engine where the standard bed mount would fasten, but with no rubbers. The "D" shaped spacers are used to avoid oil pan interference.
The top bracket is cut from heavy 6061T6 structural channel and fastens by 8 5/16" top cover bolts through the top cover.
Seen from the end, the top mount blocks are offset to the left to provide clearance for the top rear-mounted starter and the distributor.
The "dummy" block has a lot of damaged threads and broken off bolts so the top mount is fastened with whatever fit!!
The bottom brackets have been left long as they may be used as part of the front alternator mounting.
Below you can see why a bed mount would be problematic, and the location of the exhaust outlet that MAY make for some fun with the bottom firewall mounting!
The exhaust extends to 12" below the crank centerline and 7 inches behind the rear surface of the block. This forces me to mount the engine at least 1 1/2 inches farther forward than I would have to without this exhaust. The carb mounted on the top necessitates lowering the thrust-line slightly to keep the cowl down where there is a chance we can see over it (it's a tail-dragger, so good luck, right?)
Nov 24 2008 at "Gary's Adult Sandbox" at CYKF.
Adjustable legs mounted in each mount block support the engine in it's proper position on the jig.
When positioning is finalized, these legs will be tack-welded to the jig to maintain accurate position.
Note the engine mount "spools" bolted into position on the firewall jig.
The threaded rod, centered in the main bearing bores, transfers the centerline to the jig. Thrust 2 degrees to the left
and 2 degrees down. (1/2 inch in 15 inches) Note the 1/8" spacers under the top mount to allow for the engine top cover.
Pointer is one inch to the right and one inch up from the center, where the prop sits about 30 inches forward.
And wouldn't you know it, the exhaust, as it is currently configured, goes right through the right lower mount position!!!
We'll try to deal with that tomorrow.
Video of Corvair Engine running on Dyno Stand
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