Perkins 4236 Power Curve

[BO]

Can anyone supply the Power Curve for Perkins 4236 (84HP Max / 64HP Continuous) circa 1973 installation?

Thanks

BlowingOldBoots

[GordMay]

Goto Perkins, search 4.236
Perkins Diesel Engines & Powerpart Parts: Engine Specifications

[BO]

No Luck on the search Gord but thanks for the link. I have contacted them via their contact page so we shall see what they say. I am in the Middle East at the moment so dont have the engine number which is probably the first thing they will ask for. The manuals are on the boat, workshop and owners, but surprisingly no Power Curve.

The boat is over propped with a 22" x 14", not sure what this means) RH Propellor on a 1.9:1 ratio gearbox. I get heavy cavitation at 2500 rpm. At 1400 rpm she cruises along at 6 kts.

I am trying to determine if I should re prop, re engine or both. I really dont need this engine size. It was suggested to me that a previous owner put a big prop and the larger engine option into the boat to cruise fast across the doldrums at low RPM.

Anyway, that's the reason I am looking for the curve. If Perkins come up with the goods, I'll contact you with a copy.

[GordMay]

See also
Perkins Diesel Engines & Powerpart Parts: Performance and Emissions

Don't send me information. I have no use for it.

[BO]

OK understand. Thanks for the link to the explanation.

[beneteau-500]

not sure what size yacht you have but i have the same engine with a hurth360a 2.1/1.0 ratio with a 19" 3 blade prop and at 2600 it goes like the breeze and i achive 7.9 knots no probs