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Old 08 June 2004, 09:17   #11
Seb
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In all the photos ive seen of MoD P22's, the vents face forwards. On my last one however, i had them the other way around as i felt they looked nicer and were less likely to suffer from water ingress.

The only reason im questioning vents in that on my 'intended' project P22 (that is yet to be confirmed), i want to change the engine box for a watertight one.

All of the boxes available for purchase which i have seen have louvre vents as standard and that is why i was questioning their effectiveness - i want to do as little modification as possible and thought that if somebody could confirm louvre reliability, i would stick with it.

Standarsd P22 vents seem to be the only good option now though as at least they afford good protection of the actual intake nozzle and are above the top of the tubes/swamp line. Shame they take up so much room!

Probably just being over cautious but thought that if im going to the bother of redoing th engine box, i may as well do the vents properly.

Cheers for the info guys

SEB
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Old 08 June 2004, 09:58   #12
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Sorry Pete, while we on the subject of P22's again (although im sure that if im going to refurb one there is a long thread with 'stupid' questions and pictures etc looming), how does one tell if the hull is a Halmatic mould or a Victoria Marine mould....any ideas?

Am going to see one soon and would like to be able to identify what it is!

Whats yours? Any identifying features?

Cheers
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Old 08 June 2004, 11:25   #13
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JW

On Mike Garside's rib he has an air intake running up the cabin into a forward facing air intake on the roof. After a trip opening the engine lid showed a salt covered engine. Speaking to Alan Priddy, he told Mike to turn the air intake round to face away from the direction of the boat.

He did this and the salt disappeared.

From what I understood, from the conversation, the engine would suck the air in rather than having it forced in, along with the salt water.

As I know nothing about boats other than they have a pointy bit at one end does the above form any type of fact ?

Cheers

Mark
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Old 08 June 2004, 11:49   #14
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Quote:
Originally Posted by Seb
Sorry Pete, while we on the subject of P22's again (although im sure that if im going to refurb one there is a long thread with 'stupid' questions and pictures etc looming), how does one tell if the hull is a Halmatic mould or a Victoria Marine mould....any ideas?

Am going to see one soon and would like to be able to identify what it is!

Whats yours? Any identifying features?

Cheers

Sorry haven't a clue, other than being very old with a thumbing great engine in it and a console that seems to get noticed everywhere.

Pete
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Old 08 June 2004, 20:23   #15
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Originally Posted by MarkWildey
From what I understood, from the conversation, the engine would suck the air in rather than having it forced in, along with the salt water.
Mark, thanks for that. Yes, the water has more inertia than the air and won't be able to turn the corner. It's just a pity it also reduces the pressure in the engine compartment.

--------------------

Seb, I've seen the result of a hydraulic lock because an engine cover used the stainless type louvres and a wave went through and down the air intake. The little end eye and the big end eye were touching. Absolutely huge forces to bend the conrod double. It didn't crack though. Yanmar.
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Old 09 June 2004, 05:03   #16
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Quote:
Originally Posted by Seb
Sorry Pete, while we on the subject of P22's again (although im sure that if im going to refurb one there is a long thread with 'stupid' questions and pictures etc looming), how does one tell if the hull is a Halmatic mould or a Victoria Marine mould....any ideas?

Am going to see one soon and would like to be able to identify what it is!

Whats yours? Any identifying features?

Cheers
Seb
If itís got the original engine talk to Mermaid and they can tell you who they sold it to. Des
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Old 09 June 2004, 06:10   #17
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Presumably he is taking about some sort of ram air effect aka F1 race car, but don't think its going to make much difference to 2 tonnes of Pacific Rib @ 25 knots. The halmatic vents are reversable and one P22 at Ribex had them facing forward (Rib Juju).

Pete
Pete

Most P22 have forward facing vents, even the one on the VT web site.

I think that this is right because the vents point forwards into a narrow gap between the seats and behind the helm, any wave hitting from the front will be broken by the console and the helm and only light spray could enter the engine box. On my boat the vents have baffles that mean that any water going through the 2Ē gap at cover level then has to rise by 3Ē before it can enter the engine. This area between the seats is sheltered from the full force of the wind so there will be no ram air effect.

If you got a big wave from behind there is far less to stop the wave entering the vents.

Additionally my engine cover has a port hole that is put there to check for fire before opening the cover, with the cover one way round itís over the pump the other way round (with the vents forward) it is over the turbo which I feel is the most like place to look for a fire.

These engines are water proof (allegeable) up to the height of the air inlet so the engine box can take a lot of water before things go wrong.

Des
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Old 09 June 2004, 06:19   #18
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Des hi, missed you at the show, sorry wanted to meet and say hi. Totally agree, think my vents had to go on facing backwards because I cut the S/S handrail down and facing forwards they wont' fit or cover the vents properly.

Hope I don't get a green wave that high up the engine box or the crew will be in real trouble.

Pete
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Old 09 June 2004, 06:39   #19
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Pete

Yes, I hoped to meet to exchange beer, chat etc but I had to work . One thing I did get to see at the show was a part red P22 parked at the town quay that had a split engine cover that was hinges forwards and backwards. It was a neat modification which Iím thinking about doing.

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Old 09 June 2004, 07:07   #20
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Thats a good idea, because with the seats fitted I can barely lift mine. Should be able to turn that modification into 25 pages of posts just for the Jackeens and Garf

There was a red tubed one in Lymington a while back that had a new GRP engine box in one piece so someone has made a mould for them.

Pete
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