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14-11-2009, 05:15 PM
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#1
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Registered User
Country: uk
Location: portsmouth
Occupation: Director of a fiberglass company
Interests: boats,cars,bikes,paintball
Boat make: phantom 23,Extreme 24
Engines: 6.2 mercrusier + 2.5 280 mercy
Cruising area: solent
Join Date: Jul 2009
Location: portsmouth
Posts: 530
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150 to 225 promax
Is it possible to convert a 150 promax to a 225,most of the parts look the same apart from the ecu and heads ?
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14-11-2009, 05:43 PM
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#2
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Registered User
Location: Belgium
Interests: Boating
Boat make: Hydrostream HST
Engines: Merc 2.5 200
Cruising area: The Schelde
Join Date: Dec 2005
Location: Belgium
Posts: 468
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Think they have different porting?
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www.geocities.com/fletcher_arrowbeau
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14-11-2009, 06:04 PM
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#3
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Trade Member
Country: United States
Location: South Texas. USA
Occupation: Own JSRE ( Jay Smith Racing Engines )
Interests: ACCELERATION (anykind )
Join Date: Jan 2006
Location: South Texas. USA
Posts: 244
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Maybe a little but they will have different front halves 225 being a 7 petal motor and the 150 would most likley be a 5 petal. I'm sure the fuel curves in the ECU would accomindate the more HP..I have never built a 150 but built tons of 225 and 200 PM motors. They are great as long as you heed the side pin piston failures.. Top pin the pistons and use the aluminum incompased con rod bearing and chunk the nylons ones and its a great piece....
Jay
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14-11-2009, 06:14 PM
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#4
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... sundowner anyone ?
Country: mauritius
Location: flic en flac
Boat make: some rings & phantoms
Engines: some mercs
Cruising area: indian ocean
Join Date: Nov 2007
Location: flic en flac
Posts: 379
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... and different tuners
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regards
chris
bling never made anything fast
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14-11-2009, 09:21 PM
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#5
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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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nice boat in your avitar lloyde.
i recon your engine is up round 200hp already as most P20's with xr2 were running low 70's
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14-11-2009, 09:52 PM
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#6
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Registered User
Country: uk
Location: portsmouth
Occupation: Director of a fiberglass company
Interests: boats,cars,bikes,paintball
Boat make: phantom 23,Extreme 24
Engines: 6.2 mercrusier + 2.5 280 mercy
Cruising area: solent
Join Date: Jul 2009
Location: portsmouth
Posts: 530
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i was thinking the same about yours Burty im very happy with it.
I spoke to race marine and they said it is blue printed ,dressed ,it has a lightened flywheel but was wondering weather I could put a 225 e c u on it as I have heard you can , gazza gave me some 225 heads which look as if they have been skimmed compared to the 150 heads so was hoping to squeeze a little more out of the engine if it was possible , i.e. put 225 heads , e c u and change the timing
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16-11-2009, 08:14 PM
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#7
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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 do a compression test first dude tfind out what its running. you dont want anymore than 150psi really
what was the noise in the end??
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16-11-2009, 09:53 PM
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#8
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Registered User
Country: uk
Location: portsmouth
Occupation: Director of a fiberglass company
Interests: boats,cars,bikes,paintball
Boat make: phantom 23,Extreme 24
Engines: 6.2 mercrusier + 2.5 280 mercy
Cruising area: solent
Join Date: Jul 2009
Location: portsmouth
Posts: 530
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the compression was all ok oil drive bottom bearing
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17-11-2009, 07:30 AM
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#9
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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 lloyde
the compression was all ok
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yeah i ment to find out what psi you were running at the moment before you can think about putting tighter heads on
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17-11-2009, 07:59 AM
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#10
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Registered User
Country: uk
Location: portsmouth
Occupation: Director of a fiberglass company
Interests: boats,cars,bikes,paintball
Boat make: phantom 23,Extreme 24
Engines: 6.2 mercrusier + 2.5 280 mercy
Cruising area: solent
Join Date: Jul 2009
Location: portsmouth
Posts: 530
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now im going to put it back with the 150 heads leave it as it was
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17-11-2009, 12:24 PM
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#11
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Registered User
Country: Norway
Location: Oslo Norway
Occupation: Shipping Broker
Interests: Coaching my daughter in offshore racing.
Boat name: Z-111
Cruising area: The fjord outside Oslo
Join Date: Jul 2007
Location: Oslo Norway
Posts: 72
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P20 & Promax 150
Quote:
Originally Posted by lloyde
now im going to put it back with the 150 heads leave it as it was
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Hi lloyde, seems we're running almost the identical package. Last year we changed engine from 1st gen XR2 to 2,5 150 super magnum (promax) which was a very positive experience ! We will stick to our original 150 super mag which is very reliable and very powerful compared to the hp and compared to the XR2. Have not run a dyno but will later just for the curiosity. We are easily running low 70's.
best regards
Miss Coco
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