The Auto PSRU’s 250Z Zero Offset PSRU for Subaru was developed as a replacement gearbox for Eggenfellner Subaru 4 and 6 cylinder engines. This gearbox has all of the same features of our original BW-350 PSRU, including the centrifugal clutch and flywheel assembly, plus all the new features listed below that make it the 250Za. Consequently, with this new PSRU, Subaru engine owners no longer have to tolerate the torsional vibrations that many have considered “normal”. Smooth and quiet operation, the double reduction gearbox offers over 150 different gear ratio choices. Gear ratios are easily changeable by returning the gearbox to Auto PSRU with your ratio choice. Finally, charges for gear ratio change out are approximately $1100 done by Auto PSRU’s.
The multiple gear ratios available means the 250Za can be adapted to any engine upto 300 HP. Please consult with us if you have any doubt on the best ratio for your engine.
PSRU 40 lbs, Flywheel Assy 30 lbs.
Total 70 lbs (dry), 2 lbs less than Eggenfellner.
Firewall Forward Packages Available, pricing details on website for Subaru and Mazda engines.
| Horsepower | 150-300 HP |
| Engine Applications | Subaru 2.5L 4 cyl & 3.0L 6 cyl, Ford and Chevy Inline 6 cyl, Mazda Rotary, adaptable to others requiring zero offset from prop flange centerline to crankshaft centerline via engine mounting plate |
| PSRU Weight | 2 lbs lighter than Egg Gen III (with flywheel) at 70 lbs (with automatic flywheel/clutch assy) |
| Prop Flange to Block Face | Same as Eggenfellner |
| Prop shaft to crankshaft centerline | Zero inches |
| Reduction Ration | Over a dozen possible, engine specific, please inquire |
| Prop Flange | All popular bolt patterns |
| Lubrication | Completely self contained, force fed by dedicated oil pump and filtration system |
| Prop rotation | Conventional or counter rotational |
| Clutch and Flywheel Assembly | Included |
| Clutch type | Dry, centrifugal, dampens harmonics |
| Delivery | Delivery times for PSRU’s is now 130-160 days. |
Lee Apaka graciously allowed us to use photos (above) of his beautiful RV7 flying the Auto PSRU’s 250Z PSRU on his H6 Subaru Boxer engine, and sporting some fantastic new radiators by Ed Klepeis of Tech Welding in Paducah, KY. Lee reports fantastic engine cooling using this radiator and cowl configuration.
If you would like to know more about how to improve Subaru engine cooling log on to http://www.techwelding.com/index.html or call Ed Klepeis at 270-898-3776.
Click here to see the 250Z Auto PSRU’s Zero Offset Gearbox being test run on Frankenstein, our test mule. We are running it with a 72″ Hartzell two blade hydraulic prop on a 350 Chevrolet engine under full load at full pitch. After 8 hours running non-stop, you can wrap your hand around the oil filter and it is barely more than body temperature to the touch.
The gearbox bolts on via an adapter plate while your starter remains in its current location under most circumstances. likewise, you may use the gearbox with or without the Eggenfellner front engine mounting plate. (Front engine mounting plate not included, shown below for clarity)
To see a pdf documentary of Lee’s experiences as he replaces the Eggenfellner Gen III gearbox with the Auto PSRU’s 250Z PSRU click here…it is 47 pages long so be patient and give it time to open up.
Zero offset design – the input shaft and
propeller are on the same vertical plane
Perfect for horizontally opposed & rotary engines
Current price $37,000
Please feel free to call us at (936) 827-5126 if you have any questions or comments, or email Stuart@AutoPSRUs.com.