Hello all,

I've been kicking around a few engine options for my 601 HDS project (about 60% finished) - I've disassembled two Corvair engines and prepared to rebuild to WW specs, considered Jab 3300s, Rotax, Viking, even an Aeromomentum (suzuki geo). I figured it was important to make a decision relatively soon so I can plan out things like the fuel system, EMS, panel layout, W&B...Anyway, one engine I had sort of forgotten about was the Subaru EA81. On the Zenith website, there are dozens of photos of 601's flying behind the engine, and they even reference having factory support for Stratus Engines (now out of business). I've rebuilt several high HP Subaru engines for auto use, so I feel comfortable with the design and layout of the engine. 

All that said, I just picked up a running Subaru EA81 flight engine with a "reductions" (by Dave Johnson) belt redrive and 72" 3 blade Powerfin prop for an absolute song. The engine is in great shape and has 120 flight hours in a Rans S7. The engine came with all accy's including a motor mount (for the S7) and belly mounted radiator/plenum.

I've got a few questions about the engine:

-Does Zenith still support the EA81?

-Does the EA81 fit under the Rotax 912 cowl? What sort of spinner should I use?

-Is anyone flying behind an EA81 with a "reductions" redrive?

-What diameter prop would you recommend for my HDS - 72" 3 blade seems a bit long

-Dave Johnson (Winnipeg, CA), the designer of "reductions" belt driven PSRU's has passed away - are there any manuals floating around for his systems? 

-Is this redrive still serviceable or has his design become obsolete? Is it worth investing in a new unit? (Air Trikes seems to have a good following - no belts to adjust, lightweight, good price...) 

-I'll need an engine mount - is there anyone out there selling one, or could you send me measurements? (I'd rather not reinvent the wheel)

I've attached a photo of my engine still attached to the crate and the prop just resting on the hub.

Thanks for your input! Any other advice is always welcome!

Chad