Who manufactures this housing on Kelly Troyer's Dyke Delta/

Steve Carlisle


Steve,

It was made by "Mistral" in Switzerland when they were selling engines and some associated parts
to the experimental crowd several years ago....This housing replaced the front 13B cover and allowed
the Rotary to be attached to a standard  Lycoming "Dynafocal" engine mount........It included a custom
water-pump , vacuum or hydraulic pump drive pad and alternator mount........Their early engines used
primarily Mazda parts and their custom parts were directly adaptable to stock 13B engines........


Kelly Troyer


Better to use Paul's engine mount bracket and spacer assembly. PSRU and prop almost balance the engine weight. Now if you are going to the trouble to build a new housing, I would think building it with the Mazda bell housing pattern on the front housing would make sense. A new front cover that bolts to that and include a gear case for accessory drives for alternator, water pump, possible vacuum and cabin pressure pumps and hydraulic pump. Design so a gear or two can be repositioned to change rotation. This would allow turning an engine around for twin use for counter rotating props. The accessory gear change to keep accessories turning the same direction.


This would result in reduced part number inventory for engines, PSRU and accessory drives. In a manufacturing environment like Mistral was looking to, part number inventory is a huge item.
If you check the cost of main and camshaft bearings for Chevrolet 305 and 350 V8 and compare with 4.3 V6, you find it is less expensive to buy the V8 part number and throw a bearing away. The reason is the number sold even though the bearings are the same. Theoretically the V6 sets should be 80% of the cost of the V8 sets. Part number inventory and sales volume is the answer. Mistral had their heads where the sun does not shine and screwed up.

Dale Davies


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