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Old 03 June 2004, 11:20   #1
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Pacific 22 / Mermaid

Hi
Can anyone tell me what power the 4 cylinder Mermaid engine is rated at for continous use and at WOT. I seem to remember seeing different ratings from 140 to 180 hp. I'm looking at one this W/E which the owner thinks is rated at 180 or 160hp. Presumably, different ratings are acheived by tweaking the fuel pump and or the turbo. Is there any easy way of determining what the engine has been rated at?

I've also been told that flat out is only about 20 to 25 knts and using quite a lot of fuel.

Cheers all

Andy
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Old 03 June 2004, 11:38   #2
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Andy
In original guise they were 140hp and do, on average with an average prop. (16 ¾ X 21” pitch) about 25. My one uses 1 lt per NM at WOT. Most are tweaked at the pump but I don’t know how you can tell other than the seals being removed or maybe lots of black smoke.
Des
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Old 03 June 2004, 12:03   #3
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Andy, I have managed 30 knots but that was lightly loaded and she now averages 27-28 tops with 200 hp. No easy way to say what Hp the engine is. You could take a note of the serial number and give mermaid a ring to see if they have worked on the engine. However there are a few about with claimed 200 hp and they are not. The only real way to find out would be on Mermaids dyno.

Fuel is about the same as Scary Des at 1LPM.

Pete
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Old 03 June 2004, 12:23   #4
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Thanks Guys,

Des, is yours rated at 140 hp or higher? If so, I'm a little bit puzzled if you are getting about 25 knts where as Pete is getting about 27 -28 knts at 200 hp.

Pete, is yours the 4 cylinder, and presumably 200 hp is about the most you could get out of this unit?

Thanks

Andy
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Old 03 June 2004, 12:44   #5
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Yep, on a good day its 200 hp but that was 4 years ago on mermaids dyno, so probably a bit less now.

Pete
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Old 03 June 2004, 13:05   #6
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Mermaid Turbo 4 in P22

Just to chuck in my 2ps worth -

Was looking at Pacific 22 a couple of years ago and spoke with Mermaid about ratings and was told the following:

The ones supplied for the navy P22s were 140hp.
These could be uprated to about 160hp - 180hp. Any more than this and they might not last too long. This is due to the 140hp version having higher compression pistons than the leisure version.
The leisure version produces up to 200hp. (Can't remember if this has a different turbo as well)

I have also had a ride in a Fairey Huntress with an "experimental" 230hp Turbo 4. Seemed to run OK but was a bit smoky (black smoke). The boat would only go as slow as 6 knots on tickover at which the engine vibrated awfully - when the speed was increased so that the vibration went away the boat speed was 9 knots!

As pete7 says - call Mermaid they have always been helpful.
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Old 03 June 2004, 16:49   #7
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I've just bought a P22 hull and most of the bits to put it back together again, Spoke briefly to Mermaid and aparently there are 2 different turbos fitted and 2 different sets of internals for the fuel pumps, they couldn't tell me how to work out what I had but suggested that I give them the serial numbers and they might be able to find out, but haven't been able to do this yet.
Good luck! Oh, and mine's apparently 150Hp, didn't come from the navy..... who knows what I've got?!! At least it starts and runs ok.
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Old 04 June 2004, 02:35   #8
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Quote:
Originally Posted by Andy Cox
Thanks Guys,

Des, is yours rated at 140 hp or higher? If so, I'm a little bit puzzled if you are getting about 25 knts where as Pete is getting about 27 -28 knts at 200 hp.
Andy
I'm not sure, what I do know is that it came straight from the navy and that there are no lead seals on the pump. So it is possible that a navy boy has been fiddling

Des
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Old 04 June 2004, 10:09   #9
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Ok, here we go again !

The vast majority of ex navy P22's were fitted with 140 hp turbo 4's.

Remember that this turbo 4 is a dover block and is commonly fited to ford cargo lorries.

The earlier p22's were fitted with a turbo 4 that used a 'dorset' block. This was termed in the motor trade as a 'D' series lorry.

The Dorset block wont do much above 140 hp, and I think as standard in a P22 was between 115 hp and 125 hp. Looking at them, they are quite similar from the outside.

The newer 'dover' block which was the most common fitted can be cranked up to 160 - 165 hp by simply adjusting a screw on the top of the fuel pump which increases the fuel - quite easy to do but better if it is set up on an injection pump machine.

If looking to go further, the turbo generally has to be uprated, and some internals changed. Sometimes the fuel pump has to be changed as some were fitted with the non turbo fuel pump.

The best thing is to contact mermaid with the engine number and they can tell you what it was when they sold it. After that you would have to take the pump off, put it in to a pump specialist and they would tell you what the output on the pump was.

Another thing to keep in mind, these engines were never sold by ford as a turbo engine, Mermaid bought the blocks, changed the pistons etc. Quite unlike the newer blocks where Ford have done most of the work before it leaves the factory. Good luck...
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Old 04 June 2004, 11:22   #10
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Thanks everyone for the info and advice.

I will go and have a look at it and note down the engine number ( by the way, where is the engine number on these units? ) and call Mermaid about it.

Cheers

Andy
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