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Dolfin Engines

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Senior Member
Username: ernie

Post Number: 2216
Registered: 01-2002

Posted on Friday, January 22, 2016 - 01:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Ran across this on the net the other day and don't remember seeing them on here.


Engine: Three port, two stroke.
Cylinders: Two.
Bore: 63mm (12bhp), 68mm (16hp).
Stroke: 56mm (12bhp), 60mm (16hp).
Displacement: 350cc + 440cc (16hp).
Power Output: 12bhp + 16bhp.
Torque: 19ft/lb + 24ft/lb Max.
Carburettor: Amal Series 200.
Fuel: Petrol/Oil mixture.
Fuel Consumption: 2/3 pints/hour at cruising - 8.60 pints/hour at full throttle (12hp) +25% 16hp.
Lubrication: Petrol/Oil mixture 40/1.
Cooling: Raw water.
Water Pump: Johnson F35B-8.
Sparking Plugs: AC-46 XLS, NGK-BP5ES, Champion-N16YC.
Engine Mounting: Flexible, on four sheer rubber bobbins.
Maximum Installation Angle: 15 degrees.
Crankcase: Sea water res. alloy - fully machined.
Crankshaft Assembly: Four flywheels, shafts and two crankpins pressed up into a complete assembly with connecting pins.
Connecting Rods: Forged, with hardened and ground big end eyes.
Big End Bearings: 24 uncaged rollers in two rows of 12 for each big end.
Pistons: Lo-Ex alloy with narrow rings of considerable radial depth. Oversize available.
Gudgeon Pins: Needle Roller Bush - running on hardened and ground Gudgeon Pin.

Cylinder Heads: Sea water res. alloy, fully machined toroidal form combustion chambers - large water passages.
Cylinders: Close grained nickel iron. Very large water passages.
Starting: 12 Volt through roller clutch. Emergency hand start at front of engine (flat belt).
Battery: 12V x 50/60amp.hour capacity (minimum).
Charging: 500 Watt Alternator.
Weight: 120lbs. including Mtgs. and gearbox (54 kg).
Control Panel: "A" water resistant plug-in flat panel with battery condition indicator, ignition switch and charging warning light. "B" as above with rev. meter and ammeter.
Ignition: Lumenition breakerless ignition with high voltage discharge coil. Twin trigger back-up system.
Remote Controls: Single lever throttle and gearbox.
Drive: 2-1 reduction through Hurth FNR gearbox (3-1 optional).
Propeller: 12"/13" x 10" Bronze R.H. fixed (folding optional). 14/15" (16hp).
24 Month Guarantee: (from date of purchase): provided your engine is installed to normally accepted commercial standards Dolphin guarantees parts of their own manufacture against faulty workmanship. ANY CARRIAGE COSTS are on the account of the purchaser. Spark plugs, belts and/or misuse or flooding are excluded.

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Senior Member
Username: todd_vidgen

Post Number: 265
Registered: 03-2008
Posted on Sunday, January 24, 2016 - 03:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I had a RCA mk 5 version of that. It had a dyno start built into the fly wheel. To go from fwd to reverse ,you turned the engine off ,flicked the switch that controlled the starter winding's, push the start button , and the motor ran backwards. I would rather have a gearbox.Turning motors on and off when maneuvering can have nasty moments . The dyno start made for a much more compact motor ,no alternator etc. Good little motor ,but the alloy head and manifold had asprin like characteristics in salt water. Todd

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