3.6l 54 hp Super Major/Trader rpm under workload

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3.6l 54 hp Super Major/Trader rpm under workload

Postby RBack » Sat Oct 19, 2019 10:07 pm

Having a 4 cyl 3,6 L Trader/Super Major 1962 in my boat (made the same year).
Parsons Pike Marine is the name of the motor in its marine version.

A new propeller is to be fitted and in the process of adjusting its (the props) size I've, been checking different rpm and boat speed with the old prop.

If I've understood everything correctly, this engine should normally run with maximum 1600 rpm under load (according to the Super Major Handbook I've downloaded).
Maximum torque is at 1200 rpm
Unloaded it should reach 1900 rpm according to the same papers.

My aim is to have the new propeller adjusted so that the motor can run with its most efficient revs at the boats cruising speed (hull speed - it's a full displacement hull)
with efficient I mean the most fuel efficient and the most efficient in terms of engine sustainability under constant workload (driving a boat is constant workload).

Would this be at 1200 rpm or is it something else?

And by the way... When checking the rpm without workload, the motor revs far beyond 2000 rpm. I wasn't too keen on letting it do so, but curiosity took over and for a short brief second I had it running with 3000 rpm. Curiosity killed the cat but not the engine.
Does that mean anything in regards to the theoretical numbers mentioned in the handbook?
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Re: 3.6l 54 hp Super Major/Trader rpm under workload

Postby yann1967 » Sun Nov 03, 2019 9:28 am

This means that full power is reached at 1200rpm.

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Last edited by yann1967 on Wed Nov 13, 2019 1:26 pm, edited 1 time in total.
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Re: 3.6l 54 hp Super Major/Trader rpm under workload

Postby RBack » Fri Nov 08, 2019 5:41 pm

At least in theory - which I suppose is the only thing to follow as long as the engine hp and torque isn't measured.
However it's quite recently restored, so it should be in fairly good shape.

So in terms of theory... then the most efficient (also fuel efficient) rpm is 1200? Am I correct?
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