Stationary Engines |
| Manufacturer | Model / hp | Spark Plug | | Manufacturer | Model / hp | Spark Plug |
| Clifford Aero | Fork Lift (Ford 10) | L-10 | Delco Light | 10mm Fitting | Y-6 |
| Clifford Aero | 18mm Plugs | 7 Com L | Dennis | Mower | 8 Com |
| Clifford Aero | Stacker Truck (Meadows ELAV) | L-10 | Dixon Hawkesworth | Road Roller | L-10 |
| Clifford Aero | Rotovator Model 1 (JAP 80cc) | XL-10 | Dixon Hawkesworth | 2-Stroke Petrol | N-7 |
| Clifford Aero | Rotovator (Villiers 78cc) | L-10S | Dixon Hawkesworth | Type CM8 (Jap Engine) | L-10 |
| Clifford Aero | Rotovator Model A1 (Jap Mod 5) | L-10 | Dixon Hawkesworth | Type CM1 (Petters Engine) | N-8B |
| Clifford Aero | Rotovator Model IV (JAP 600cc) | N-8B | Dorman Engines | ---- | 8 Com |
| Clifford Aero | Rotovator Model IV (BSA 500cc) | L-10 | Douglas | 1000cc Twin | L-10 |
| Coburn | ---- | 7 | Douglas | 450cc 540cc 630cc C/Iron Head | L-10 |
| Coldwell Mower | 1/2" Gas fitting | A-25 | Douglas | 450cc 540cc 630cc Ali Head | N-8B |
| Coldwell Mower | 7/8" SAE Fitting | 20 | Dudbridge Gas Engines | ---- | 17 |
| Coldwell Mower | 18mm Fitting | 8 Com | Easimow | With JAP 80cc engine | XL-10 |
| Colwood | ---- | N-8B | Economil | ---- | L-10 |
| Coventry Climax | Models FF, FP | L-10 | Ferro | ---- | C-5 |
| Coventry Climax | Models FSM, FW | N-8B | F.M. (Johnson) | ---- | L-10 |
| Coventry Climax | 750cc Side Valve V-twin JAP | 7 | Ford Industrial | 18mm | 7 |
| Coventry Climax | Models SM & Z | N-8B | Ford Industrial | 14mm | L-10 |
| Coventry Climax | F engines | L-10 | Fowler | 4hp | N-8B |
| Coventry Climax | Model FWA | NA-10 | Fowler | Others | 7 |
| Crossley | Engines | 8 Com | Gardner | ---- | 7 |
| Crossley | Lighting Plant | 17 | Garrett | Cultivator | 8 Com |
| Cumberland Mower | ---- | 8 Com | Gleniffer | ---- | 8 Com |
| De Dion | ---- | 7 Com | Green | Mower | 8 Com |
| Delco Light | 7/8" SAE Fitting | C-5 or 20 | G.R.S. | ---- | 8 Com |
| Delco Light | 18mm Fitting | J-8 | Gyro | 350, 700 | 17 |
| Delco Light | 14mm Fitting | J-8 | Hamworthy | ---- | 8 Com |