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Old 04-02-2006, 08:42 AM   #1
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Boat make: Midas 27' Cat, Argo 16 Cat. Avon Rib Thingy
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Wanted 2.5/2.4 Engine (Offshore)

Well having finally broken out of the coffin and climbed out of the pit , I'm going boating again.
I'm looking for 2.4 or 2.5 offshore (20 inch) 1.87 RH
Also what are the +VE & -VE points of each engine and or model.
I was hoping the 123 Million was going to be mine last night but alas the new 280 will have to wait.

So If you have one of the above send a PM

If you can chip in on the technical stuff then post away I know I need the info. I have 20 years to make up in the next 6 to 8 weeks. Firstly
what are the typical compressions on a 2.4 & 2.5
what is the realistic output of a 2.4 EFI , 2.5 Carb, 2.5 EFI models I've seen 245 -260 & 280 is this right, if so what year with what output
Nickel Vs Steel liners
TBo times
All boxes interchangable early Vs Late
Carb Vs EFI
ect
ect
ect




cheers
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Old 04-02-2006, 10:48 AM   #2
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Country: netherlands
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Interests: fast boats/porches
Boat name: bernico cat
Boat make: bernico 26 cat 2x 2,5,s
Engines: merc,s 2,5 EFI,s
Cruising area: ijselmeer

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Jeeez thats a lot of questions.
There are a few outboards made the last 24 years (V6 HP)


2,4 EFI ,82 was the first with EFI ,and the ECU was much bigger than now.
I thought these were 240 BHP at the crankshaft
2,4 EFI,after ,84 cranks out 240 BHP
2,5 EFI ,91-96 cranks out 260 BHP
2,5 EFI 96- now 280 BHP
2,5 drag > 300 BHP
these were propshaft measured
2,4 carb high performance is around 225 BHP
2,5 carb high perf 245 BHP

You want to look after the pistons ,there are pistons where the pin locater that holds the piston ring in place comes out,and possible destroy a block.
top locators pistons are good.
Still a good 2,4 EFI will come close to a 2,5 EFI.
Switch piston rings at 120-150 hours,and look at the reeds(tips)
Do a injector test,or buy new ones,let them test flow your injectors and put the one that gives the most fuel in No 5,then in No3.
these are running hotter.

sterling
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Old 04-02-2006, 10:53 AM   #3
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The 2.5 is the better motor but will cost more!!!

2.5 has alot more low down torque than the 2.4 and more power at the top end too.

Typical compression on a standard 2.5 high performance motor is 135 PSI, if its been tuned it could be anything up to about 150 PSI for a pump gas motor. I'm not sure but I think the same applies for the 2.4 Bridgeport high performance.


2.4 Bridgeport was I think 86 to 89/90

2.4 Bridgeport EFI is 245HP
2.4 Bridgeport carb is 225HP (but 245HP really - see below)


2.5 90/91 to 98:

2.5 EFI 260HP
2.5 carb is 245HP (but 260HP really - see below)


98 to present:

2.5 EFI is 280HP

The carb motors were rated at less HP than their EFI stable mates, however in actual fact at the top end the carb motors made just as much power as the EFI ones. They rated the carb motors lower as they wouldn't have sold many of the more expensive EFI motors had the power ratings been the same. The EFI motors however do have alot more low down punch than their carb equivalents.

Both 2.4 and 2.5 motors would have been nicasil when new. Later 2.5's (95 on) were nicom. As for wether nic is better than steel I don't really know. Jay Smith likes nic motors where as I believe John Marles (US1) prefers steel .They're both members of this forum and highly respected engine builders so hopefully they will post on this subject!!!

Yes gearboxes are interchangeable as long as the shafts are the correct length.
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Old 04-02-2006, 11:05 AM   #4
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I'm sure I dont need to tell you this but theres alot of people out there selling stuff that they claim is new than it actually is so:

2.4 block, upto 89. Note: the shape of the block within the nice oval I went to the trouble of drawing on it.
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Old 04-02-2006, 11:07 AM   #5
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2.5 block from 90/91 onwards. Again note the shape of the side of the block within the drawn on oval compared to the above 2.4 block.
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Old 04-02-2006, 11:08 AM   #6
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Again a 2.5 block. Note the arrowed flat squares cast into the block. These arrived on the unpainted high performance blocks in 95. I dont think they were ever on the painted non race motor blocks.
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Old 04-02-2006, 11:16 AM   #7
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Also the 280 has an alternator and thus only fits under an alien cowl. So if someones trying to sell you a 280 that has the old square cowl and no alternator then its a 260 or older!!!

There is an alternator kit for the older motors but it fits on the starboard side, A 280 will have its alternator on the port side.
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Old 04-02-2006, 11:24 AM   #8
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Engines: Merc 280-ROS -JSRE,65Xs, 75 Stinger, Yam 60
Cruising area: Any Seedy Bar

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Spares availablity on the 2.4, yes or like hens teeth.
Ref the alternator that would be a fully regulated chrging system as opposed to the wizz bang magnets boiling the at battery & high output for long periods. Is it a mod worth doing. I gather this comes from playing with the flywheels & Stators for the Max BHP are the flywheel changes easy to spot as it somthing I wouldn't want to happen
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Old 04-02-2006, 12:07 PM   #9
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Spares availability on the 2.4 is probably not quite as good as the 2.5 but should be okay.

The standard stator system only puts out 16amps and a fair chunk of that will go towards running the boat and engines electrical equipment. The charging current wont' be much more than the output of a tricle charger, so you won't be boiling your battery. In fact you'll be doing well if your taking out less amps than your putting in.

As for the alternator the main advantage is the 60+amp charging compared with 16amp and yes I would imagine its fully regulated. If your planning on having alot of electrical and electro/hydraulic equipment in your boat and you can afford the alternator kit then yeah I'm sure its worth it. But lots of people seem to do okay with the standard setup.

If you do want an alternator kit check out this members website:

Alternator Kit
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Old 04-02-2006, 06:03 PM   #10
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fantastic,some great info! how do the xr2s in various years of manufacture compair to the figures listed above?
jamie.
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Old 04-02-2006, 06:32 PM   #11
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Greg at GB watersports has two 260's for sale give him a call on 01733 322108
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Old 06-02-2006, 09:56 AM   #12
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come on guys,lets keep this thread gonna,its a great source of info for people like myself who are confused about differnt merc outboards!
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Old 06-02-2006, 10:09 AM   #13
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Boat make: Midas 27' Cat, Argo 16 Cat. Avon Rib Thingy
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Well I'd chip in but everything I know about is in the Science Museum or the scrap yard
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Old 06-02-2006, 03:14 PM   #14
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did you ring Greg?
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Old 06-02-2006, 08:24 PM   #15
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Quote:
Originally posted by michaelcaine
come on guys,lets keep this thread gonna,its a great source of info for people like myself who are confused about differnt merc outboards!
You can find out most things about mercs by using the search facility on scream and fly!!!
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Old 06-02-2006, 08:51 PM   #16
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It is a very good source but the difference in Termonolgy can make it thinking reading
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Old 08-02-2006, 01:15 AM   #17
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Country: netherlands
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Boat name: bernico cat
Boat make: bernico 26 cat 2x 2,5,s
Engines: merc,s 2,5 EFI,s
Cruising area: ijselmeer

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Also a way to check out if its a 2,4 or 2,5
The 2,4 liter has a exhaust cover plate in 2 pieces,with a gasket between them.
thats the plate where the coils mount,between the left and right cilinder banks.
the 2,5 has a single plate ,a one piece foam release casting.
Also the airhorn on a HP engine is different.
The 2,4 used a standing butterfly,and a 2,5 butterfly is laying flat.
To check out if its a 2 litre ,can be done at the back under the right cilinderbank,under no 5 there is a casting number,I have to find out what numbers are from a 2 litre ,but I,m sure some one will know on boatmad.
The 2,4 EFI is originally 240 propshaft horsepower not 245.
I have a original 1889 brochure from merc here ,that says 240 hp
at 6800 rpm.
I know its only 5 hp.

sterling
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Old 11-02-2006, 10:08 AM   #18
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Quote:
Originally posted by sterling
I have a original 1889 brochure from merc here ,that says 240 hp at 6800 rpm.
Didnt realise they made 2.4 EFI's back then
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