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03-02-2005, 02:59 PM
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#1
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Registered User
Country: Denmark
Boat make: Cobalt 263
Engines: Merc HP500EFI
Join Date: Feb 2005
Posts: 467
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Top end
Hi,
looking for some advice..
a Phantom 21ft with a 225 optimax, wht will it do top end-wise?
late 60's or??
Trying to ask the same question again
Can somebody help me with the idffernce in the racing engines and the Optimax/ and or 2 stokes - whats the difference??
What kind of reliability should I expect in the 2.5 Racing?
Service pricing etc..
How stable are the "Racings" from Merc. in comparison to the Optimax's?
Thanks
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Lars
"you can't live in the past nor future, only the present - so enjoy the ride"
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03-02-2005, 03:37 PM
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#2
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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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P21 depending on setup will do around 70mph with a 225 promax
2.5 EFI's (racing engine) require a rebuild every 100 hours
i've had one on my P20 for around 9months but already had an injector fail at a cost of £500 however if you are willing to rev them they are a great engine and it pushes my boat to around 85MPH
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03-02-2005, 05:37 PM
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#3
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Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
Interests: Boating/Squash
Cruising area: Essex Marina/crouch southeast coast
Join Date: Sep 2004
Location: Great Stambridge Essex
Posts: 2,033
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y did it cost £500 for a injector or did it run lean?
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03-02-2005, 06:33 PM
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#4
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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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Quote:
Originally posted by Taz
y did it cost £500 for a injector or did it run lean?
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No dude it was just the injector, but these engines cost a fortune
By the time it was diagnosed, repaired, front end removed and internals inspected to make sure it hadn't done any other damage (cus when an injector fails you also loose oil)and tested the money soon adds up
that was a second hand injector too.
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21-03-2005, 12:31 PM
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#5
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Registered User
Country: Denmark
Boat make: Cobalt 263
Engines: Merc HP500EFI
Join Date: Feb 2005
Posts: 467
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thx.. went for the 225 opti.
What kind of tuning is available for this engine??
low cost??
medium cost??
expensive - I guess a PM 300
__________________
Lars
"you can't live in the past nor future, only the present - so enjoy the ride"
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21-03-2005, 01:39 PM
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#6
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Registered User
Country: UK
Location: South West
Boat make: Cyclone/ Cyclone/Rinker
Engines: Merc 2.5 efi's/300XS/5.0 v8
Join Date: Feb 2005
Location: South West
Posts: 592
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If you think you can get 100 hours out of your 2.5 youre on borrowed time, 50 hours is the max, especially if run hard, I rebuild mine after 30 hours tops, the rings are usually on their way out by then. I have three of them in different states of tune, the harder you run them the less time they will do between rebuilds
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21-03-2005, 02:33 PM
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#7
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Traveling
Country: UK
Location: Alderholt
Occupation: Aerospace
Boat name: T/T D2S
Boat make: Midas 27' Cat, Argo 16 Cat. Avon Rib Thingy
Engines: Merc 280-ROS -JSRE,65Xs, 75 Stinger, Yam 60
Cruising area: Any Seedy Bar
Join Date: Sep 2004
Location: Alderholt
Posts: 4,225
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When you guy's say rebuild what do you define that as - re ring or more.
Any info on the 300Promax Regarding rebuild intervals
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21-03-2005, 02:42 PM
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#8
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Registered User
Country: Denmark
Boat make: Cobalt 263
Engines: Merc HP500EFI
Join Date: Feb 2005
Posts: 467
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What tuning is availbe for the Optimax - and what prices are we taking about..?
Exhaust? porting? ECU? ect...
__________________
Lars
"you can't live in the past nor future, only the present - so enjoy the ride"
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21-03-2005, 03:08 PM
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#9
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Registered User
Country: UK
Location: Thorpe Bay
Occupation: IT Director, www.lighthouseit.co.uk
Interests: Boats, Surfing & Snowboarding
Boat name: Isabella / Cool Runnings II / Bella / Sea Pup / Sea Dog / Speedy II / Bernico F3
Boat make: Colvic 35 Suncruiser / Bernico F3 / Phantom 16 / Zodiac 420 YL / RIB / Apollo 9
Engines: 2 x Perkins Sabre 225ti / Mercury Pro XS /Mercury Pro XS 115/ Tohatsu 2.5 / Mercury 25 / Mercury 50
Cruising area: Thames Estuary / River Crouch / Salcombe
Join Date: Jun 2004
Location: Thorpe Bay
Posts: 932
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Quote:
Originally posted by Wacky Racer
If you think you can get 100 hours out of your 2.5 youre on borrowed time, 50 hours is the max, especially if run hard, I rebuild mine after 30 hours tops, the rings are usually on their way out by then. I have three of them in different states of tune, the harder you run them the less time they will do between rebuilds
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Does the same go for the XR2 if not how long before that needs a rebuild?
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Loving the Spitfire with a 25HP Mercury
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21-03-2005, 03:09 PM
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#10
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Registered User
Join Date: Mar 2004
Posts: 6,891
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It all depends on how fast you spin it.
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21-03-2005, 04:03 PM
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#11
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Registered User
Country: UK
Location: Thorpe Bay
Occupation: IT Director, www.lighthouseit.co.uk
Interests: Boats, Surfing & Snowboarding
Boat name: Isabella / Cool Runnings II / Bella / Sea Pup / Sea Dog / Speedy II / Bernico F3
Boat make: Colvic 35 Suncruiser / Bernico F3 / Phantom 16 / Zodiac 420 YL / RIB / Apollo 9
Engines: 2 x Perkins Sabre 225ti / Mercury Pro XS /Mercury Pro XS 115/ Tohatsu 2.5 / Mercury 25 / Mercury 50
Cruising area: Thames Estuary / River Crouch / Salcombe
Join Date: Jun 2004
Location: Thorpe Bay
Posts: 932
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normally 6,400 rpm can get it to 6,700 if its really flat!
__________________
Loving the Spitfire with a 25HP Mercury
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21-03-2005, 04:09 PM
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#12
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Registered User
Country: UK
Location: South West
Boat make: Cyclone/ Cyclone/Rinker
Engines: Merc 2.5 efi's/300XS/5.0 v8
Join Date: Feb 2005
Location: South West
Posts: 592
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Re-ring is the minimum on a 2.5, also get the injectors cleaned, if run really hard a set of reeds is not uncommon. the reed holders are susceptible to cracking.
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21-03-2005, 04:39 PM
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#13
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hello
Join Date: Mar 2004
Posts: 2,739
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Quote:
Originally posted by Wacky Racer
I have three of them in different states of tune, the harder you run them the less time they will do between rebuilds
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What sort of RPM's do you spin your motors too dude?
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21-03-2005, 04:44 PM
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#14
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Registered User
Country: UK
Location: South West
Boat make: Cyclone/ Cyclone/Rinker
Engines: Merc 2.5 efi's/300XS/5.0 v8
Join Date: Feb 2005
Location: South West
Posts: 592
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ANYTHING UP TO 8700 DEPENDING ON WHICH ONE I,M RUNNING
2.5,S DON,T LIKE IT AT 8000 RPM THE VIBRATION KILLS THEM EITHER RUN UPTO 7800 OR OVER 8200
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21-03-2005, 04:57 PM
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#15
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hello
Join Date: Mar 2004
Posts: 2,739
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I guess that some sort of harmonic resonance thingy then is it?
I thought it was the single ring motors that are turning around 9000rpm that needed a rebuild after 20 to 30 hours but a motor spinning in the 7's would last a lot longer, like 70 to 100 hours.
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21-03-2005, 05:16 PM
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#16
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hello
Join Date: Mar 2004
Posts: 2,739
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Quote:
Originally posted by Wacky Racer
If you think you can get 100 hours out of your 2.5 youre on borrowed time, 50 hours is the max, especially if run hard
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It seems your right dude, I've just had a look on scream and fly and it seems that for side pinned pistons on a motor with big exhuast ports (like a 260) 50 hours is about the max before your risking the pin coming out.
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21-03-2005, 05:17 PM
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#17
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Registered User
Country: New Zealand
Location: Auckland
Occupation: Construction Manager
Interests: Offshore Powerboat Racing
Boat name: NZ Privateer
Boat make: 29ft Catamaran
Engines: 2 x Mercury 300X
Join Date: Dec 2004
Location: Auckland
Posts: 214
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I run two 2.5's on my cat and we rebuild after 25- 30 hours, basically at the end of each season.
Pistons, rings the works
What you have to realise is that these are a specialist race motor and not recommended for recreational boating.
we rev ours out to 8300 maximum, they are standard 2002 280hp offshores.
On our ski boat we have a 200XS Optimax, much better motor for everday use.
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21-03-2005, 06:53 PM
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#18
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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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Quote:
Originally posted by Wacky Racer
If you think you can get 100 hours out of your 2.5 youre on borrowed time, 50 hours is the max, especially if run hard, I rebuild mine after 30 hours tops, the rings are usually on their way out by then. I have three of them in different states of tune, the harder you run them the less time they will do between rebuilds
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well thats fekkin fan tabby dosey. more fekkin expense then. guess i should start and save for a rebuild now then. how much are top pinned pistons? or better still is it possible to see if i already have them by looking through the plug hole?
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21-03-2005, 06:59 PM
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#19
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Oy dont get nun a that troubel wi me aul trarkter motors yanows!, she jus rattles arn n arn she doos.
But then it do only doo 70
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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21-03-2005, 07:03 PM
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#20
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Registered User
Join Date: Mar 2004
Posts: 5,724
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Quote:
Originally posted by Jonny
Oy dont get nun a that troubel wi me aul trarkter motors yanows!, she jus rattles arn n arn she doos.
But then it do only doo 70
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