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Thread: 2.5 260 vs 2.5 280
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10-06-2012, 09:15 PM #1Member
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2.5 260 vs 2.5 280
Pros and Cons of one vs the other? Any preference? I know the 260 has a weak charging system and people recommend putting on a Simon alternator kit.
What else?Cheers,
Trevor
86 Eliminator Liberty 250xs
86 Commander Merc 200 - sold.
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10-06-2012, 10:16 PM #2
280 gets twice the fuel economy.......or it seems like it does.
Larry Gempp Jr.
Proud HydroStream Powertour Member
Current Ride - 2024 22 Liberator - 450R
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10-06-2012, 11:34 PM #3The Reverend, (Cedar Machine Service on Facebook)
1989 HST 2.5 260 Merc Offshore
1991 Vaserette YT 200 Mercury
1988 Venus XT 200 Yamaha
1983 Viper II Merc 90
1977 Viper
Mini GT tunnel, 25 Merc
"African Queen" pontoon 25 Merc
Aluma fishin tub, 20 motors to choose from!
GUESS WHAT?...I gotta fever,...and the only prescription...IS MORE COWBELL!!
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10-08-2012, 08:19 PM #4Member
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if switching from a 2.4 to a 2.5 280, do I need a new tuner and adaptor? not clear on what is better 1 piece or 2 piece.
Cheers,
Trevor
86 Eliminator Liberty 250xs
86 Commander Merc 200 - sold.
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10-08-2012, 08:45 PM #5
The 280 needs a 1 piece adapter, and it should be the 2.5 adapter. Or else you'll have a big mismatch between the block and the adapter. Some people hog out the adapter to match the 280, but you should really have the matching 2.5 adapter. It's even better if it is the 2.5 1 piece adapter with the 280 tuner, but you can get by without that specific tuner.
1998 22' Scarab 7.4 liter Merc (bought another one)(And gone again)
1990 STV Pro Comp Merc Bridgeport/Merc 280/Optimax 300XS
1988 Hydrostream HST Merc Bridgeport/ Merc 280 (recently gone)
1992 25' Aggressor 454 Merc (gone)
1196 22' Scarab 7.4 Merc (long gone)
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10-19-2012, 03:24 PM #6
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11-09-2012, 08:32 AM #7
My Allison with an A - 48 box set at 98 gets 4 1/2 miles per gallon cruising at around 60 -65 with a 26 ET . Now the STV even with a set up digital box uses way more fuel due to the higher engine height etc . Both engines are 260 's , both charging systems are weak as well . Always fully charge your battery and if it's at all suspect , replace it with a hot one . Never been let down .
" The Fleet of Old Boats "
'73 -14' Orlando Clipper Skiff -Yamaha 25
93- 18 ' Renegade Nomad Flats boat -Merc 150
'94 - 21 ' Allison XB - 2003 -Merc 260
'97 - 19 ' STV Euro - Merc - 260
'99 Benninton 2375 TOONER - V-6- 2 liter 150 Mariner
2001 Grady White 263 - Twin Yamaha 250 OX 66
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11-25-2012, 04:48 PM #8Junior Member
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I owned a 1994 260 hp 2.5. I agree on the alternator--once I got in the habit of putting it on the battery charger, before I wanted to use it, I didn't have any more dead battery problems. Also, it was easy to flood when it was warm. I heard that the later 280 hp models were easier to start when warm. I sold my boat, 18 ft. Seebold mod-V tunnel, with that engine in 2007 and boy do i miss it! Richard in Texas