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Old 03 June 2007, 07:39   #1
Razorbill's Avatar
Country: UK - England
Town: The West End, Penryn.
Boat name: Jenny Haniver
Make: Pacific 8313
Length: 6m +
Engine: Mermaid Turbo 4
Join Date: Jun 2007
Posts: 134
Pacific 22/Mermaid Q`s?

Hi, I`m looking at a couple of Pacific 22`s near me in Cornwall and I`m a bit puzzled about some of the Mermaid engine characteristics. The engines of two boats I have viewed appear to "breathe" quite heavily from the pipe that comes from the rocker cover which then goes into a metal box in the bilge and hence out through another pipe and skin fitting a the rear of the engine box. Quite a bit of steam/vapour comes out under running. I am told this is normal?
Also, what degree of speed/engine revs should I expect? I`m led to believe that 28-29 kts flat out with a cruising speed of nearer 25?
Thanks in advance for your help.

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Old 03 June 2007, 12:56   #2
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Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,223
I think Pete7 on here is your man for Q's like those! He has a copy of the Pac22 manual on his website at:

Which might be of interest.
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Old 04 June 2007, 17:07   #3
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Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,865
Hi and welcome to ribnet. They do breath a little at speed from the rocker cover, but then its a 4.2L 4 cyl engine with so each piston is on the large size and presumably some gas gets past the piston rings into the sump and vents out of the rocker cover. The engine design has been around a long time so whilst its not state of art, it can be easily repaired with a set of spanners. Not sure what the box does, mine just vents straight from the rocker cover to the back of the engine box.

The engine should rev to 2600 revs and in standard tuning give 26 knots with a 16.75 x 21" prop. However this is 140hp. If the engine has been tweeked then 165 - 180 hp is reasonably easy to achieve and should give 28 knots. Ian Austin achieved 28 knots like this. 200 hp is possible although a factory rebuild is likely to be needed and will just give 30 knots in light trim.

Standard fuel tank is only 80 litres which is a little small for cruising so consider replacing it with a 170 L tank from Vetus which is a good fit in the same space. We use about 1lpm at 20 knots and 1.5lpm at 24 knots.

There is lots of posts on Pacifics over the years on here so well worth doing a search.

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