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20-10-2013, 12:22 PM
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#1
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Registered User
Join Date: Aug 2013
Posts: 39
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Whats the difference Between an Mercury XR2 and an SST120
Im looking at purchasing 2.5L powerhead but getting alot of offers for XR2's
and SST120's
Whats the difference? and are they a better engine to go for than a 2.5L?
Thanks
Niall
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20-10-2013, 01:33 PM
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#2
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Registered User
Country: Guernsey
Occupation: Engineer
Interests: Restoration
Cruising area: Channel Islands & northern French coast
Join Date: Jan 2009
Posts: 154
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Yes, no, maybe!
General answer for a general question...Niall, you're gonna get lots of depends how you drive your boat, conditions and set up questions. Your question raises so many others Just go with what your Mechanic recommends, unless he wants to kiss you...don't go with that, and try it.
Re the differences between the SST120 and the XR2 I was told they had slightly different porting and carb set up but that could be all pants. Google it mate.
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20-10-2013, 07:05 PM
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#3
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Registered User
Country: UK
Location: Surrey
Occupation: Motorsport Development inc Engine Managment
Boat make: 21ft
Engines: Various
Cruising area: Solent / Kent / Cornwall
Join Date: Oct 2011
Location: Surrey
Posts: 375
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I asked the same recently, and for reference I picked up a complete SST120 power head for £1K that is in reasonably good shape. The SST would be the one I would now go for as they also tend to be newer (at least that was my experience) and I found so many people claiming to have XR2's but didnt really know what they had. I.e. black 150hp versions or unpainted 200hp race versions. Even then people seem to have differing opinions, but the SST120 imho is a better engine.
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20-10-2013, 08:28 PM
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#4
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Captain slow
Country: england
Location: surrey
Boat name: terminal velocity no.120
Boat make: phantom20
Engines: 2.5efi smillin jack
Cruising area: solent
Join Date: Mar 2006
Location: surrey
Posts: 478
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Difference
I thought the sst120 was made for circuit cats,and came with a12" shaft length.where as the xr2 was made for the European 2 ltr offshore class,and came with a 20" shaft.but both had the same power head.
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20-10-2013, 09:08 PM
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#5
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Captain slow
Country: england
Location: surrey
Boat name: terminal velocity no.120
Boat make: phantom20
Engines: 2.5efi smillin jack
Cruising area: solent
Join Date: Mar 2006
Location: surrey
Posts: 478
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Sst
Stands for "super sport tunnel"
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20-10-2013, 10:37 PM
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#6
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Registered User
Country: UK
Location: Surrey
Occupation: Motorsport Development inc Engine Managment
Boat make: 21ft
Engines: Various
Cruising area: Solent / Kent / Cornwall
Join Date: Oct 2011
Location: Surrey
Posts: 375
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There are some minor differences, so its not exactly the same power head.
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20-10-2013, 10:49 PM
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#7
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Captain slow
Country: england
Location: surrey
Boat name: terminal velocity no.120
Boat make: phantom20
Engines: 2.5efi smillin jack
Cruising area: solent
Join Date: Mar 2006
Location: surrey
Posts: 478
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Quote:
Originally Posted by beyondhelp
There are some minor differences, so its not exactly the same power head.
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Which are?
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20-10-2013, 11:46 PM
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#8
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Registered User
Country: UK
Location: Surrey
Occupation: Motorsport Development inc Engine Managment
Boat make: 21ft
Engines: Various
Cruising area: Solent / Kent / Cornwall
Join Date: Oct 2011
Location: Surrey
Posts: 375
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See for yourself:
XR2 Parts
http://www.mercruiserparts.com/selec...R+XR2%2FMAGNUM
SST120 Parts:
http://www.mercruiserparts.com/selec...oc_nbr=SST+120
Totally different type of carbs for a start. SST has electronic fuel pump. XR2 is crankcase driven. Reed block assembly is different.
Exhaust tuning is different.
Block/crank/pistons/rods/heads are the same - so there ARE many shared major parts but its not quite the same.
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21-10-2013, 03:27 AM
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#9
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Registered User
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
Posts: 1,803
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Sst is basically an xr2 with locked timing run backwards.
So to run it on an offshore boat you would need to put timing arm on and change starter. Then you'd pretty much have an xr2.
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21-10-2013, 09:53 AM
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#10
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Registered User
Country: UK
Location: Surrey
Occupation: Motorsport Development inc Engine Managment
Boat make: 21ft
Engines: Various
Cruising area: Solent / Kent / Cornwall
Join Date: Oct 2011
Location: Surrey
Posts: 375
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Thats interesting. Unless mine was already modded, it turned the same way as the old V6 150 it replaced..
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21-10-2013, 12:11 PM
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#11
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Registered User
Country: Guernsey
Occupation: Engineer
Interests: Restoration
Cruising area: Channel Islands & northern French coast
Join Date: Jan 2009
Posts: 154
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Yeah yours was modded, as you say, before you got it
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21-10-2013, 01:27 PM
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#12
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Captain slow
Country: england
Location: surrey
Boat name: terminal velocity no.120
Boat make: phantom20
Engines: 2.5efi smillin jack
Cruising area: solent
Join Date: Mar 2006
Location: surrey
Posts: 478
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Answered
There you go Niall,question 1 answered. As for are they better than a 2.5L? If it's a 2.5 200 your talking about,then I believe the xr2 is quicker,however the 2.5 makes max power at less revs and has more torque at low revs. So for pleasure purposes the 2.5 is proberbly the better choice.Imho.
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21-10-2013, 04:15 PM
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#13
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Registered User
Country: Guernsey
Occupation: Engineer
Interests: Restoration
Cruising area: Channel Islands & northern French coast
Join Date: Jan 2009
Posts: 154
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Quote:
Originally Posted by andymac
There you go Niall,question 1 answered. As for are they better than a 2.5L? If it's a 2.5 200 your talking about,then I believe the xr2 is quicker,however the 2.5 makes max power at less revs and has more torque at low revs. So for pleasure purposes the 2.5 is proberbly the better choice.Imho.
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He knows ya know...I agree wholeheartedly with Mr Andymac.
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21-10-2013, 11:23 PM
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#14
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Senior Member
Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France
Join Date: Jan 2005
Location: Devon
Posts: 3,095
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From new a SST 120 Powerhead was a direct replacement for XR2 by simply swapping Starter and Flywheel to make it run right rotation.
Sadly whatever you do to it, it will still be a Mercury and as such will make a really good time consuming hobby !!
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If Only
National Outboard Immersed Propeller Mono Record 103mph
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22-10-2013, 11:26 AM
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#15
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Captain slow
Country: england
Location: surrey
Boat name: terminal velocity no.120
Boat make: phantom20
Engines: 2.5efi smillin jack
Cruising area: solent
Join Date: Mar 2006
Location: surrey
Posts: 478
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Hobby
Just out of interest bob,when you set the "National outboard immersed propeller mono" record at a blistering speed of 103mph. What make was the outboard??
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22-10-2013, 11:31 AM
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#16
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Registered User
Country: UK
Location: Gosport
Occupation: Own a small building firm.
Interests: Boats, kids and looking after the Wife HaHa
Boat name: Shamu
Boat make: Banana Shark 770
Engines: Mercury XS300
Cruising area: Solent
Join Date: Aug 2013
Location: Gosport
Posts: 368
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Quote:
Originally Posted by Niall.Bougourd
Im looking at purchasing 2.5L powerhead but getting alot of offers for XR2's
and SST120's
Whats the difference? and are they a better engine to go for than a 2.5L?
Thanks
Niall
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Save some more money and buy a optimax. You will save a large fortune in fuel!!!
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22-10-2013, 11:45 AM
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#17
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Aged Member
Country: UK
Location: HAMPSHIRE
Occupation: Safety Engineering
Boat name: Savannah
Boat make: Princess 415
Engines: Volvos
Cruising area: SOLENT
Join Date: Oct 2004
Location: HAMPSHIRE
Posts: 779
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Quote:
Originally Posted by andymac
Just out of interest bob,when you set the "National outboard immersed propeller mono" record at a blistering speed of 103mph. What make was the outboard??
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Aha...Touche.....
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Land was invented to give boats somewhere to visit
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22-10-2013, 01:35 PM
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#18
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Senior Member
Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France
Join Date: Jan 2005
Location: Devon
Posts: 3,095
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Quote:
Originally Posted by andymac
Just out of interest bob,when you set the "National outboard immersed propeller mono" record at a blistering speed of 103mph. What make was the outboard??
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It only had to last about 3 mins and required a rebuild after 10 !!
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If Only
National Outboard Immersed Propeller Mono Record 103mph
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22-10-2013, 02:12 PM
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#19
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Captain slow
Country: england
Location: surrey
Boat name: terminal velocity no.120
Boat make: phantom20
Engines: 2.5efi smillin jack
Cruising area: solent
Join Date: Mar 2006
Location: surrey
Posts: 478
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It still helped set the record tho bob,why didn't you use another make that would do the same or more speed,but not need rebuilding after 10mins.
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22-10-2013, 02:40 PM
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#20
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Senior Member
Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France
Join Date: Jan 2005
Location: Devon
Posts: 3,095
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Its all we had !!
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National Outboard Immersed Propeller Mono Record 103mph
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