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04-11-2007, 09:25 AM
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#1
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Executive Member
Country: U.K
Location: Poole
Interests: Boats
Boat name: Indecent Proposal
Boat make: Phantom 18
Engines: Mariner V6
Cruising area: southwest/southeast
Join Date: Nov 2007
Location: Poole
Posts: 137
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Phantom 18ft 175hp V6 Mariner
Can only get 5k rev`s trim in,with lazer2 21p.
Need more, any idea`s?
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Can`t Help Sickness !
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04-11-2007, 09:53 AM
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#2
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Registered User
Country: UK
Location: Coventry (but from Lee on Solent)
Occupation: Sales Director
Interests: My Boat of course
Boat make: Extreme 21
Engines: Merc V8
Cruising area: Solent
Join Date: Jul 2005
Location: Coventry (but from Lee on Solent)
Posts: 587
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smaller pitch prop will give you more revs - but if its a v6 175 spinning a 21 laser id have thought you'd be getting more than 5k anyway. Sure the gauge is reading right?
What speed u getting??
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The Docta
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04-11-2007, 09:58 AM
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#3
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Executive Member
Country: U.K
Location: Poole
Interests: Boats
Boat name: Indecent Proposal
Boat make: Phantom 18
Engines: Mariner V6
Cruising area: southwest/southeast
Join Date: Nov 2007
Location: Poole
Posts: 137
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Quote:
Originally Posted by The Docta
smaller pitch prop will give you more revs - but if its a v6 175 spinning a 21 laser id have thought you'd be getting more than 5k anyway. Sure the gauge is reading right?
What speed u getting??
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No reason to think Gauge is wrong,but not sure.
52mph from speedo of gearbox,what about lifting engine up a bolt?
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Can`t Help Sickness !
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04-11-2007, 02:36 PM
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#4
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Registered User
Country: UK
Location: Coventry (but from Lee on Solent)
Occupation: Sales Director
Interests: My Boat of course
Boat make: Extreme 21
Engines: Merc V8
Cruising area: Solent
Join Date: Jul 2005
Location: Coventry (but from Lee on Solent)
Posts: 587
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Low 50's does sound a little slow for your set up. Id have thought you'd see mid to high 50's at least.
Could try jacking it up a bolt. How far under the bottom of the hull does the centre of the gearbox case sit at the moment?
Risk with jacking up the motor is that you run it too high and end up with low water pressure. Do you have standard pickups or low water pickups? If they are standard, you can block the top two sets off which may allow you to run a little higher.
I forget how far under the bottom of the hull the bullet should be but am sure someone else can advise
Best of luck
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The Docta
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04-11-2007, 10:48 PM
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#5
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Executive Member
Country: U.K
Location: Poole
Interests: Boats
Boat name: Indecent Proposal
Boat make: Phantom 18
Engines: Mariner V6
Cruising area: southwest/southeast
Join Date: Nov 2007
Location: Poole
Posts: 137
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Quote:
Originally Posted by The Docta
Low 50's does sound a little slow for your set up. Id have thought you'd see mid to high 50's at least.
Could try jacking it up a bolt. How far under the bottom of the hull does the centre of the gearbox case sit at the moment?
Risk with jacking up the motor is that you run it too high and end up with low water pressure. Do you have standard pickups or low water pickups? If they are standard, you can block the top two sets off which may allow you to run a little higher.
I forget how far under the bottom of the hull the bullet should be but am sure someone else can advise
Best of luck
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Cheers for advise will let you no outcome
__________________
Can`t Help Sickness !
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05-11-2007, 09:15 AM
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#6
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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I'd have thought 5000rpm was about right as trimming out should pick up 1000revs and at 5 to 8mph
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05-11-2007, 11:55 PM
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#7
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catch me if u can
Country: wales
Location: beaumaris
Occupation: marine technician
Interests: doing up boats and moding cars
Boat name: catch me if u can
Boat make: not sure what it is yet.its about 14-15foot
Engines: merc 60hp
Join Date: Nov 2007
Location: beaumaris
Posts: 9
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when fitting an outboard the cavertashion plate should be flush with the bottom of the boat take a straght peace of wood and hold it on the bottom of the cav plate and jack engine up untill the wood is on the bottom of the boat if u see what i mean sorry about the spelling like the post before mine 5000 is about as much as u want to rev if its a mercury/mariner they only rev to 5500 and some to 6000
depending if its the optimax or the 4stroke range..if u go down an inch on the prop u might find that u are on the edge of the rev limmiter and the smallest amount of trim out and u will have beeps goin off every 2 minutes
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11-11-2007, 06:00 AM
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#8
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Registered User
Country: england
Location: the grim north
Occupation: robot
Cruising area: tyne
Join Date: Nov 2004
Location: the grim north
Posts: 915
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don,t know about a 175 but a bog standard 200 with a low water pick runs about 70 best was 73. a good starting point was propstaft about 1" below bottom of boat. i would get a laser 23. the engine should also be making more rpm. if in doubt trim out
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Speed costs weight so what do we cut off first
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15-11-2007, 07:04 AM
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#9
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Executive Member
Country: U.K
Location: Poole
Interests: Boats
Boat name: Indecent Proposal
Boat make: Phantom 18
Engines: Mariner V6
Cruising area: southwest/southeast
Join Date: Nov 2007
Location: Poole
Posts: 137
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Quote:
Originally Posted by fullbore
No reason to think Gauge is wrong,but not sure.
52mph from speedo of gearbox,what about lifting engine up a bolt?
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I`ve just changed to a foot throttle after 10 yrs since had boat,i know i`ve missed out on proper control of boat all these yrs ,anyway i`ve taken throttle cable off from control box when i realised the cable was not located properly in box so when full throttle applied all of the cable was moving forward so im 99% sure this is why only 5k rev`s.Yet to try as still on refit of interior.watch this space.
__________________
Can`t Help Sickness !
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15-11-2007, 08:47 PM
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#10
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Registered User
Country: England
Location: Crayford, Kent.
Occupation: Electrical gezza!
Interests: Petrolhead
Boat name: Wayne Kerr
Boat make: Phantom xl
Engines: Mercury 2.5, 200(ish)
Cruising area: Essex, Hampshire, Mediterranean
Join Date: Sep 2004
Location: Crayford, Kent.
Posts: 1,199
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Quote:
Originally Posted by dave_123
when fitting an outboard the cavertashion plate should be flush with the bottom of the boat
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Really ,,, now we know what the problem is.
We've all got it wrong from day one, maybe that's why our fishing gear goes over the back when we put our foot down!
Thanks Grave_ 321.
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16-11-2007, 09:28 AM
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#11
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BananaShark Member
Country: UK
Location: Salcombe South Devon
Occupation: Racer and builder
Interests: Winning races
Boat name: BananaShark
Boat make: BananaShark 34' Race
Engines: Twin Yanmar BY 260's
Join Date: Mar 2004
Location: Salcombe South Devon
Posts: 4,638
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Quote:
Originally Posted by dave_123
when fitting an outboard the cavitaion plate should be flush with the bottom of the boat take a straight peace of wood and hold it on the bottom of the cavitation plate and jack engine up until the wood is on the bottom of the boat if you see what i mean sorry about the spelling like the post before mine 5000 is about as much as u want to rev if its a mercury/mariner they only rev to 5500 and some to 6000
depending if its the Optimax or the 4stroke range..if u go down an inch on the prop u might find that you are on the edge of the rev limiter and the smallest amount of trim out and you will have beeps going off every 2 minutes
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Just out of interest how long have you been a marine technician?
__________________
Cookee
British Champions! RIB Formula 1 2005
National Speed Record Holder at 90.15 (still)
www.bananasharkracing.com
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16-11-2007, 09:51 AM
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#12
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Registered User
Join Date: Mar 2004
Posts: 6,891
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I know what you're thinking.
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16-11-2007, 09:54 AM
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#13
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Registered User
Country: Job Centre
Location: In a box
Occupation: Chaos's gofer
Interests: Skiving
Boat make: Spectre 30
Engines: 2 x Promax 225
Cruising area: In the bath
Join Date: Mar 2004
Location: In a box
Posts: 5,201
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__________________
Chaos for Moderator.
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16-11-2007, 10:52 AM
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#14
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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I went in a boat once with the engine fitted as described above i only got about 200yards before turning round and giving it back to the owner as i didn't like the fact that my head was in the water because the boat rolled over so much
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24-11-2007, 10:17 AM
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#15
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Executive Member
Country: U.K
Location: Poole
Interests: Boats
Boat name: Indecent Proposal
Boat make: Phantom 18
Engines: Mariner V6
Cruising area: southwest/southeast
Join Date: Nov 2007
Location: Poole
Posts: 137
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Got to be in it to win it!
__________________
Can`t Help Sickness !
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14-04-2008, 07:13 PM
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#16
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Executive Member
Country: U.K
Location: Poole
Interests: Boats
Boat name: Indecent Proposal
Boat make: Phantom 18
Engines: Mariner V6
Cruising area: southwest/southeast
Join Date: Nov 2007
Location: Poole
Posts: 137
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Quote:
Originally Posted by The Docta
Low 50's does sound a little slow for your set up. Id have thought you'd see mid to high 50's at least.
Could try jacking it up a bolt. How far under the bottom of the hull does the centre of the gearbox case sit at the moment?
Risk with jacking up the motor is that you run it too high and end up with low water pressure. Do you have standard pickups or low water pickups? If they are standard, you can block the top two sets off which may allow you to run a little higher.
I forget how far under the bottom of the hull the bullet should be but am sure someone else can advise
Best of luck
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Sorted.Control box throttle cable not attached properly,so not getting full chat.now pullin full rev`s.Nice
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