Yes, we are here!

In times like these our hobbies become lifesavers. At GAS ENGINE MAGAZINE and FARM COLLECTOR, we have been tracking down the most interesting and rare vintage farm machines and collections for more than 80 years combined! That includes researching and sourcing the best books on collectibles available anywhere. Our online store is open and we are here to answer any questions you might have. Our customer service staff is available Monday through Friday from 8a.m.-5p.m. CDT. We can be reached at 1-800-888-9098 or by email. Stay safe!

Oil Field Engine News

Tracking the Elusive Black Bear

| April/May 2004

  • Black Bear

  • Black Bear engine as shown in a circa 1920 Oil Well Supply Co. catalog.
    Black Bear engine as shown in a circa 1920 Oil Well Supply Co. catalog.

  • Black Bear
  • Black Bear engine as shown in a circa 1920 Oil Well Supply Co. catalog.

One of the rarest oil field engines is the 'Black Bear' sold by the Oil Well Supply Co. of Pittsburgh, Pa. Of side shaft design, Black Bear engines are very pleasing to the eye thanks to their many moving parts while in operation.

Black Bear engines were ahead of their time with features such as mechanically actuated intake valves, optional air starting, a water pump and a triple-redundancy ignition system. Engines were built in 25, 35 and 40 HP sizes.

One thing I don't know for sure is whether Oil Well Supply actually manufactured these engines, or if they were sourced from another company. Existing engines are few, but I was fortunate to track down a circa-1920 Oil Well Supply Co. brochure that describes the engines:

Black Bear Gas Engines

'Black Bear gas engines are designed to meet the most severe requirements in the oil country. All parts are made with a view of exceeding the strength actually required.

'The engine is of the four-cycle type with valve mechanism operated by a camshaft driven by spiral gears from the main shaft. Both inlet and exhaust valves are operated by the same cam.

'Governing is effected by means of a Pickering governor, which can be set to operate the engine at a fixed speed or can be controlled by a line operated from the derrick floor.


Gas Engine Magazine A_M 16Gas Engine Magazine is your best source for tractor and stationary gas engine information.  Subscribe and connect with more than 23,000 other gas engine collectors and build your knowledge, share your passion and search for parts, in the publication written by and for gas engine enthusiasts! Gas Engine Magazine brings you: restoration stories, company histories, and technical advice. Plus our Flywheel Forum column helps answer your engine inquiries!

Facebook YouTube


click me