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Old 08 July 2004, 13:57   #21
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Country: UK - England
Town: Falmouth
Boat name: Big Blue
Make: Halmatic Pacific 22
Length: 6m +
Engine: Mermaid 140
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Hi All,

Just thought I'd update you on my quest to find out a bit more about my Mermaid Turbo 4. The chaps at Mermaid are excellent and Chris in particular is very helpfull indeed. He looked up the original build card when the engine was signed over to the MOD and told me that it was set up at 140hp @ 2600rpm with a no load WOT of 2870rpm. I explained that I would like to set the pump up to give about 160/165hp and he suggested that I take the fuel pump off and have it set up properly, and as I have an account with Lucas, I decided to do just that. He also said that a fuel setting of 19.6cc over 200 shots at a calibration speed of 600 rpm using ISO4010 nozzles would acheive 165 hp assumig that everything else on the engine is OK. Boost pressure at 140 hp should be just under 1 bar and at 165 hp should be just over 1 bar.
So off came the pump, bit of a fiddle, and Lucas came to collect it on Tuesday. Yesterday I get an interesting call from their diesel guy who explained that the pump was delivering 26cc!! I got him to calibrate it at 19.6cc as suggested and I can now adjust it between 19.6 and 26cc. The screw needs to be turned out by 1.5 turns to adjust this. 1/2 turn =21.8, 1 turn=24 and 1.5 turns =26cc. I spoke to Chris at Mermaid about this who said 26cc equates to 200hp. I now need to get the number off the turbo to see if it is the 200 turbo or the original. Sorry this is all very boring but I now intend to carry out some tests with my workshop tacho and boost guage and a GPS to see exactly what it's doing. If it's the original turbo, I think I will keep the setting down to limit it to about 170ish hp as Chris explained that running these engines at too high a power setting for too long is going to make something go bang eventually.

Cheer for now

Andy
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Old 08 July 2004, 17:25   #22
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Country: UK - Scotland
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p22

Andy,

Why not check your Wot under load. It will then probably do 2800 rpm under load if it does that in neutral, with 26 ccs going in to the engine. The next thing if it isnt going fast enough would be a simple prop upgrade.

It is important to up the prop rather than flying around at a higher rpm and a small prop, as im sure you will know. The throttle stop on the pump will hopefully be set up properly, but worth a check.

Neville
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Old 09 July 2004, 03:21   #23
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Country: UK - England
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Quote:
Originally Posted by Andy Cox
Hi All,

................ Mermaid The screw needs to be turned out by 1.5 turns to adjust this. 1/2 turn =21.8, 1 turn=24 and 1.5 turns =26cc. I spoke to Chris at Mermaid about this who said 26cc equates to 200hp.....
Andy do you turn the screw stop to stop? or have you marked it in some way.

Quote:
Originally Posted by Andy Cox

..............carry out some tests with my workshop tacho and boost guage...............

Andy
Where do you take the tacho from? I think my guage over reads and I want to check it, the only way I can think of doing it is with an optical tacho is there another way?
Des
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Old 09 July 2004, 03:54   #24
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Country: UK - England
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Make: Halmatic Pacific 22
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Neville,

The govenor control screw still has the lead seal on it, so the RPM is still going to be 2600 but as I say I want to check it anyway with my tacho and under load.

Scary Des,

My workshop tacho is an optical one with a laser sight and I have found it to be very reliable. It's the same one that Joe Poulter uses for testing.
As far as the pump is concerned, my man at Lucas has put a series of punch marks on the top plate, 2 either side of the screw, in effect creating a straight line accross the screw with the slot in the screw aligned with the punch marks. At this position it is set at 19.6cc and so I can accuratly wind it out by 1/2 a turn at a time. The really important thing is not to forget how many 1/2 turns have been made or else its back to square one

I need to establish which turbo is on there, which I will do later today and then carry out some runs under load at different fuel settings to establish an optimum for my application. I'm hoping to do this at the W/E.

Andy
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Old 09 July 2004, 04:47   #25
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Des, the tacho drive on mine is taken from a widget hidden under the fuel filters. I think it works the same way as a dizzy does on a petrol engine. Its loose at the moment so under reads at speed. It means stripping the intercooler and fuel filters out to get at it so I am leaving it until the winter.

Mermaid have a box of second hand ones which they showed me when I asked how it worked last week.

Pete
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Old 09 July 2004, 05:17   #26
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Pete

Just had a look and canít see it, maybe thatís why it is under reading , having said that what am I looking for? (JK Why isnít there a smiley with an exclamation or question mark? I need then all the time)

Des
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Old 09 July 2004, 05:50   #27
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Des

Mine has two wires that connect to the widget, deep under the fuel filters starboard side. The widget is about six inches long but three inches locate inside the engine. The bit you can see is about the size of a small yogurt pot.

Have you got an alternator sensed one then ?

Pete
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Old 09 July 2004, 06:03   #28
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Des, I was thinking about installing one of these if I couldn't get the Tacho to read properly

http://www.tinytach.com/tinytach.html

Pete
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Old 09 July 2004, 06:39   #29
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Quote:
Originally Posted by Pete7
Des, I was thinking about installing one of these if I couldn't get the Tacho to read properly

http://www.tinytach.com/tinytach.html

Pete

Pete,

Have a look at this

Useful Tacho

it gives a uk contact for them....

Bill
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Old 09 July 2004, 06:56   #30
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Country: UK - England
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Boat name: JU-JU
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Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
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Quote:
Originally Posted by Pete7
......Have you got an alternator sensed one then ?....

Pete
Pete
Could be, because I can not see any wires on that side of the engine. Iím told itís adjustable but what I donít know is does this adjustment happen at the gauge or the sensor?

On another matter, I keep forgetting to centre the outdrive before lifting the leg and am in the process of destroying the plastic cover(weíve all done it ), I have a spare and Iím thinking about making a fibreglass plug so I can have more spares in the future. What I canít decide is whether this cover does much. I think that its main role is cosmetic and it does offer some protection to the bellows but other than that I canít decide. What are your thoughts?

Des
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