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Morgo pump

Morgo pump

Postby chrisf1 » Mon Dec 14, 2015 7:17 am

Hi again has anyone any experience of the Morgo rotary oil pump for a pre unit, do they stop the wet sumping ? are they as good as Morgo say ? and are they worth the money ? any downsides to them ? thanks a lot Chris

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Re: Morgo pump

Postby Triton Thrasher » Mon Dec 14, 2015 10:58 am

What wet sumping? Triumph twins almost never wet sump. If one does, it has to be some easily fixable fault.

Use the original pump, or a replacement pump of the original type, or a Morgo plunger pump.

The rotary pump is not self priming.
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Re: Morgo pump

Postby chrisf1 » Mon Dec 14, 2015 11:21 am

My last classic was a BSA super rocket about 7 years ago and I assumed all bikes of that era wet sumped as that did, nice to know Triumphs don't the wet sumping was my main reason for changing and obviously better oil pressure why are you against them ? many thanks Chris

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Re: Morgo pump

Postby Fast Eddie » Mon Dec 14, 2015 12:26 pm

For normal road use, the standard pump is fine and seldom wears. If you need one anyway, then a Morgo plunger pump is worth buying.

However, the answer to your question is yes, the rotary pumps are every bit as good as they say. From memory, they deliver twice the flow and three times the scavenge.

The benefit to all of this is that all of the extra oil splashing around in the engine takes a lot of heat out of the engine. Also, the extra capacity means you can safely feed the rockers from the pressure side of the pump.

As TT says though, they are not self priming, this is not an issue, so long as you know it and act accordingly.

So, in summary, yes the rotary pump is an excellent bit of kit. But it is not strictly necessary in a normally used road going engine.
Last edited by Fast Eddie on Tue Dec 15, 2015 12:43 am, edited 1 time in total.
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Re: Morgo pump

Postby Triton Thrasher » Mon Dec 14, 2015 12:46 pm

There are modifications to be done, to use the rotary pump. You have to drill into the side of the oil pressure relief valve, so the excess oil squirts uselessly into the timing cover rather than building up excessive oil pressure.

That is, unless the rotary design has been modified lately.

If Eddie's a happy user, it can't be all bad, but I cannot see how it will improve your riding experience.
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Re: Morgo pump

Postby chrisf1 » Mon Dec 14, 2015 12:54 pm

Thanks for the replies it is not to improve my riding experience I just want to do it the right and best way possible and I may well after your comments just go for the ordinary Morgo pump

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Re: Morgo pump

Postby Fast Eddie » Mon Dec 14, 2015 2:44 pm

Triton Thrasher wrote:There are modifications to be done, to use the rotary pump. You have to drill into the side of the oil pressure relief valve, so the excess oil squirts uselessly into the timing cover rather than building up excessive oil pressure.

That is, unless the rotary design has been modified lately.

If Eddie's a happy user, it can't be all bad, but I cannot see how it will improve your riding experience.


I was a very happy user TT, but it was not a normal road bike application. I suffered from overheating engines in race bikes, and, long story short, the Morgo rotary pumps solved this.

As you point out, the pressure relief valve needs drilling out to allow the extra oil to flow through it when it is open. This oil, as you say, is dumped into the engine, but its not useless, as it then gets splashed around the whole internals of the bottom end, remember that apart from the big ends (and timing side bush if still fitted) the rest of a Triumph bottom end is fed by splash. Increasing the amount of oil being splashed increases this lubrication and, more importantly, cooling.

As with any Triumph, the actual oil pressure is governed by the pressure relief valve. The rotary pump will basically ensure max pressure is reached at lower revs, and ensure it is maintained even in super hot conditions and even in a less than perfect engine.

When I used them, I also pressure fed the top end. The ensuing increase in oil flow through the head also aided cooling.

But, I did also say, in a normal road going engine, the stock pump is most likely just fine!
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