American Rotary Engine /Auto PSRU’s
We’re combining these two very separate companies under one heading because they join to offer a Mazda 13B rotary engine conversion package. American Rotary builds the Wankel engines while Auto PSRU’s makes the propeller gearbox. Their long-standing offering is a 200-hp firewall-forward fitment for the RV-7.
We’ve already introduced Auto PSRU’s in this guide under our Inline and V Four-Stroke heading; American Rotary Engine is the aviation sidebar to Atkins Rotary, a hot-rod shop up to their necks in modifying and supporting Mazda Wankels for auto racers.
While American jokes that customers all want a “500-hp engine that weighs 30 pounds,” they offer up to 200-hp, naturally aspirated and turbo-normalized packages, and will support Reno racers. An aviation-specific development of theirs is a spring-loaded pop-off valve set to 4 pounds to avoid overboosting after descents or on go-arounds.
| Model | Drive Type | Horsepower | Weight | Price |
|---|---|---|---|---|
| American Rotary Engine | ||||
| 2 rotor 13B | geared | 180 hp @ 6000 rpm | 320 lb wet w/ alternator, starter, ECU, EFI and EI | $20,000 |
| Auto PSRU’s | ||||
| Mazda 13B | geared | 180 hp @ 7600 rpm (centrifugal clutch) 2.778:1 ratio | 385 lb installed, typical, complete | $34,100 FF, est. call |
| Mazda 13B turbo-normalized | geared | 200 hp @ 7600 rpm (centrifugal clutch) 2.778:1 ratio | 410 lb installed, typical, complete | $42,700 FF, est. call |
