This is the IEL Pioneer HC, an 85.7cc Canadian chainsaw manufactured by Industrial Engineering Limited in Vancouver, British Columbia. Sold during 1956 and 1957, the HC was a direct-drive, one-man saw promoted as a lighter, faster successor to the Pioneer HM.
The HC is identifiable by its rounded yellow shroud, red center stripe, Fairbanks-Morse recoil starter, rear pistol-grip handle, full-wrap front handle and distinctive control layout.
A major selling point of the model was the Tillotson diaphragm carburetor. Unlike a conventional float carburetor, it allowed the engine to continue receiving fuel while the saw was held at different angles. IEL advertised the HC as “delivering full power in any position.”
IEL Pioneer HC Specifications
| Manufacturer | Industrial Engineering Limited (IEL) |
|---|---|
| Manufacturing location | Vancouver, British Columbia, Canada |
| Model | Pioneer HC |
| Production years | 1956-1957 |
| Operator configuration | One-man saw |
| Engine | Single-cylinder, air-cooled two-stroke |
| Displacement | 5.22 cu. in. / 85.7cc |
| Bore | 2.0625 in. / 52 mm |
| Stroke | 1.5625 in. / 40 mm |
| Cylinder | Aluminum with cast-iron sleeve |
| Intake | Reed valve |
| Advertised power | 5.5 hp |
| Maximum engine speed | 4,200 rpm |
| Advertised weight | Less than 25 lb. / 11.3 kg |
| Carburetor | Tillotson HL-8A diaphragm type |
| Later carburetor | Tillotson HL-8AX |
| Carburetor repair kit | Tillotson DG-1HL minor kit |
| Air filter | Wire-screen element |
| Starter | Fairbanks-Morse automatic rewind |
| Ignition | Wico magneto |
| Ignition timing | 27° BTDC |
| Breaker-point gap | 0.020 in. / 0.51 mm |
| Flywheel-to-coil gap | Fixed |
| Spark plug | Champion J8J |
| Spark-plug gap | 0.025 in. / 0.63 mm |
| Main bearings | Ball bearings |
| Drive | Direct drive |
| Clutch | Three-shoe centrifugal safety clutch |
| Chain oiler | Manual pump |
| Fuel mixture | 12:1 using SAE 40 oil |
| Recommended fuel | Regular gasoline |
| Fuel-system features | Shutoff valve, filter and leak-resistant cap |
| Chain pitch | 0.400 in. |
| Original chain | IEL C3F or C3G |
| Advertised chain speed | 1,865 ft./min. / 9.5 m/s |
| Guide-bar lengths | 16, 20, 24, 28 and 32 in. |
| Guide-bar type | Stellite-tipped hard-nose |
| Construction | Sand-cast aluminum |
| Handle system | Rigid full-wrap front handle |
| Anti-vibration | None |
| Chain brake | None |
| Exhaust | Spark-Stop spark-arresting muffler |
| Color | Yellow enamel |
| U.S. distributor | Gale Products, an OMC division |
HC Versus HM
The HC was not simply a renamed Pioneer HM. Both models used an 85.7cc reed-valve engine and were direct-drive saws, but the HC received redesigned bodywork, a different Tillotson HL-series carburetor, a Fairbanks-Morse starter and a more compact overall layout. A surviving Canadian advertisement specifically introduced the HC as an improved replacement for the HM.
The earlier HM is credited with introducing an all-position Tillotson diaphragm carburetor to IEL’s direct-drive saws. The HC carried that idea forward in a lighter and more refined package, so it should not be described as the first chainsaw capable of cutting in any position.
Interesting Facts About the Pioneer HC
- Its production run was short. Collector records place the HC on the market only during 1956 and 1957.
- It was light by 1950s standards. IEL advertised the HC at less than 25 pounds, when many professional one-man saws still weighed considerably more.
- The horsepower figures vary. The Gale Products advertisement (above) rates the HC at 5.5 hp, while other records lists 5 hp. This is most likely a difference in advertising or rating method, rather than evidence of two different HC engines.
- It was built for cutting at different angles. The diaphragm carburetor eliminated the float bowl that restricted the operating position of many earlier saws.
- It retained a very rich fuel mixture. The original 12:1 recommendation reflects the oils and engine practice of the 1950s. Anyone returning a surviving HC to service should research an appropriate modern oil and mixture rather than automatically following the historical SAE 40 instruction.
- The listed 0.400-inch chain should not automatically be treated as modern .404 chain. The correct sprocket, bar groove and drive-link dimensions should be checked before fitting replacement cutting equipment.
- IEL had strong links with Outboard Marine Corporation. American advertising was handled through Gale Products, part of the same corporate family as Johnson, Evinrude and Lawn-Boy.
Many more IEL Pioneer Chainsaw ads here.
