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Old 06-12-2015, 11:25 PM   #1
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P18 informations

Hi everybody !

I just get a new boat, a Phantom 18 from 1994 with Yamaha 200 carb v6 from 1989 with Quicksilver Chopper 24" prop and have a lot of questions.

First of all, how can I verify if it is an original hull ? If you need some photos, I can put some here.

Currently, the anticavitation plate of the Yammi is at 12cm above the hull and the prop axis is at 17cm below, when the trim is at neutral position.
Is this a correct mount position ?

With the Chopper 24, the maximum speed before chine walking is 102 km/h (55 kt or 63 mph) with a lot of positive trim.
Sorry but I don't know the engine rpm, just sure that it is more than 5000 rev/s. The ratio is 1.86.
Is this a correct speed or it is very bad for a P18 with 200hp ?

I have a white antifouling on the hull (Soromap AF5), maybe it can increase drag ?

The boat has 2 flaps but I don't know if it is interesting to use they to increase the stability at high speed.

The tank is at the front of the boat.

I have no hydraulic steering, just one cable steering. It is important to change for a hydraulic steering for more security and steering precision ?
Seems that I have some play in the steering, maybe it can increase chine walking ?

I'm looking for an Optimax 225 to save some fuel at low and medium speeds, but the engine weight will increase of 40 kg (190kg to 229kg). Is this engine to heavy for a P18 ?

What about an Optimax 250 ? Not too punchy for a 18" hull ?

Thank you very much by advance for the future answers.
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Old 07-12-2015, 10:23 PM   #2
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Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin

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We run about that speed with a 130 Yamaha.
It should be going quite a bit faster, if engine is healthy.
Engine height can go up a little and a lot of you fit a low water pickup.
Definitely it needs a steering upgrade, especially if you decide to raise the engine any more. Any slop in your steering or mounts won't help chinewalk..
Optimax would too heavy I think. Depends on what kind of boating you do, but it would be very ass heavy.
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Old 08-12-2015, 09:26 AM   #3
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We run about that speed with a 130 Yamaha.
It should be going quite a bit faster, if engine is healthy.
Engine height can go up a little and a lot of you fit a low water pickup.
Definitely it needs a steering upgrade, especially if you decide to raise the engine any more. Any slop in your steering or mounts won't help chinewalk..
Optimax would too heavy I think. Depends on what kind of boating you do, but it would be very ass heavy.
Thank you Hydrostream for your answer !

I will use the boat only for leisure on a big lake. No competition planned. No need to have a good maneuverability in curves.
In this case, what do you think about the optimax ?
When you say that it could be too heavy, you think that it could be a problem in the waves ?

Ok for the steering upgrade.

What gap do you have between the prop axis and the hull with your 130 ?
What prop do you have to reach the same speed ?

I precise that my Chopper needs to be balanced, because 1 of the 3 blades has not a correct curvature.
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Old 08-12-2015, 10:56 AM   #4
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Location: Cheadle
Boat make: Excel 330 SD
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Are you thinking of buying a new optimax ?

I had an older opti 150 and spent lots of £ to keep it running

The older optimax engines can be expensive to repair due to there set up, compressor, air injectors £300 each etc etc. So when they go wrong the fuel saving is blown out.
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Old 08-12-2015, 01:46 PM   #5
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Are you thinking of buying a new optimax ?

I had an older opti 150 and spent lots of £ to keep it running

The older optimax engines can be expensive to repair due to there set up, compressor, air injectors £300 each etc etc. So when they go wrong the fuel saving is blown out.
Hello Whiskylee.
Interesting information, because I'm only thinking to buy used engines.

What do you think about 200XS, or Promax 225 X or Promax 300 X ?
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Old 08-12-2015, 03:46 PM   #6
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Hello Whiskylee.
Interesting information, because I'm only thinking to buy used engines.

What do you think about 200XS, or Promax 225 X or Promax 300 X ?
Never had any of them so I can't compare, for me EFI or Carb engine is the way to go if buying secondhand

Jason
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Old 08-12-2015, 05:04 PM   #7
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Never had any of them so I can't compare, for me EFI or Carb engine is the way to go if buying secondhand

Jason
Ok thanks.

I was just in contact with an owner of a Mercury 2.5L 200 EFI, who wants to sell its engine.
It is possible to increase power of the Mercury 2.5l 200 EFI easily ?
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Old 09-12-2015, 12:34 AM   #8
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Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin

Join Date: May 2004
Location: Dublin
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A 2.5 litre will be far better on that boat than any 3 litre.
By far the best option you have suggested is the 225X.
Yes the 200 efi can be modified to quite substantial power increase, but plan on changing ecu or swapping to carbs.
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Old 09-12-2015, 05:51 PM   #9
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A 2.5 litre will be far better on that boat than any 3 litre.
By far the best option you have suggested is the 225X.
Yes the 200 efi can be modified to quite substantial power increase, but plan on changing ecu or swapping to carbs.
Ok, thank you.
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