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Old 06-08-2009, 10:19 PM   #1
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Power difference

Have been wondering about the power difference between engines. This has proberbly been covered before, had a search but couldnt find what i was looking for. So here goes.

Is there much difference between a 200hp Mariner and a 200hp Mercury of the same years, even though both built by the same factory?

And is there a significant difference in performance between a 2.4 200hp and a 2.5 200hp of said engines?

Thirdly as Mercury engines are not renowned for their high reving but are the most common it seems. What is a 200hp performance compared to a 200hp of another make such as Suzuki, Yam, Evinrude, Johnson etc. This is just out of curiosity.
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Old 06-08-2009, 10:55 PM   #2
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this will be good as i was thinking the same my self as i have tryed engines but all never been the same age so cant really say
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Old 06-08-2009, 11:04 PM   #3
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Well reason i was wondering was because pre 1990/1 mariner/mercs where 2.4 and after 90/91 they became 2.5, so wondered if the 100cc made a difference. Then wondered how the mercs/mariner's compared in power against other makes of the same sized engines, power to weight ratios etc
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Old 07-08-2009, 01:55 AM   #4
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Well reason i was wondering was because pre 1990/1 mariner/mercs where 2.4 and after 90/91 they became 2.5, so wondered if the 100cc made a difference. Then wondered how the mercs/mariner's compared in power against other makes of the same sized engines, power to weight ratios etc
It's not as simple as 100cc, the 2.4 was piston ported and the 2.5 behind the liner, huge gains in power and torque. Totally different animal

I had a modified 2.4 bridgeport (about 280Hp with tight heads) on our 21 Cat that ran a best of just over 90mph and replaced it with a 225 promax and ran same speed first day out!
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Old 07-08-2009, 08:57 AM   #5
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Thirdly as Mercury engines are not renowned for their high reving but are the most common it seems. What is a 200hp performance compared to a 200hp of another make such as Suzuki, Yam, Evinrude, Johnson etc. This is just out of curiosity.
High performance Mercury engines usually rev to 7500 . My 2.5 efi with A48 ecu can rev to 11500 . None of the above engines apart from the Evinrude Etecs can live with a Mercury performance wise.

Most standard Merc and Mariner 150/175/200 engines can be made to rev to 7500 quite cheaply. Remove the 40 amp electrics and skim the heads to increase compression and you'd be amazed at the difference.

By the way a Mariner 200 is the same as a Merc 200 apart from the paint colour.
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Old 07-08-2009, 11:12 AM   #6
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Excellent. These are the answers i was looking for to satisfy a few nagging questions.
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Old 07-08-2009, 11:19 AM   #7
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It's not as simple as 100cc, the 2.4 was piston ported and the 2.5 behind the liner, huge gains in power and torque. Totally different animal

I had a modified 2.4 bridgeport (about 280Hp with tight heads) on our 21 Cat that ran a best of just over 90mph and replaced it with a 225 promax and ran same speed first day out!
So the 2.5 is a far superior engine than the 2.4 power wise? That would make sense with the speeds people have quoted from their 200hp to the speed i was getting. Obviously they where running 2.5's as opposed to my 2.4 engine.
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Old 07-08-2009, 04:55 PM   #8
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What is mentioned before here is the long powerband these mercury,s have ,you cannot compare this to an engine with a shorter powerband ,especially on a lighter performance boat .
for example if a mercury 2,5 EFI 260 hp /280 ,rev up to 8000 rpm ,and 1,87 ratio compare to a 3,0 L or more omc or suzuki/yamaha with about the same power the merc can start with a 24 pitch prop to achieve 80 mph on a certain hull,the other brands with the shorter powerband have to start at least with a 26 or bigger to come close to the same speed/propellorspeed ,but suffer because of the high pitch during the run through the powerband ,even if they have more torque low and midrange ,you cannot compare with that long powerband ,and offcoure the low weight from such an engine like a high perf merc.
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Old 07-08-2009, 06:05 PM   #9
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Old 07-08-2009, 07:37 PM   #10
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Look at the usable power of the 2 stroke over the four strokes

The 2 stroke makes power lower in the rpm and holds it to full throttle, the 4 strokes only reach peak power at full throttle.

Most torque in 4x outboards is made with ridiculous gear ratios
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Old 07-08-2009, 08:03 PM   #11
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Look at the usable power of the 2 stroke over the four strokes

The 2 stroke makes power lower in the rpm and holds it to full throttle, the 4 strokes only reach peak power at full throttle
.

Most torque in 4x outboards is made with ridiculous gear ratios
i allways thought the opposite..going back to my motorcross days,2 strokes only came alive with rpm's and the stonking 4 strokes had it from zero-8000rpm..thought it was the same with all 2 V 4 strokes
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Old 07-08-2009, 08:18 PM   #12
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2 stroke or 4 stroke can be set up for torque or high horsepower ,or both ,it all depent on how the engine is built /set up by the factory,and durability and purpose ..
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Old 07-08-2009, 09:10 PM   #13
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Re-post of image above!
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Old 07-08-2009, 09:55 PM   #14
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Re-post of image above!
intresting to see the e-tec peaks then drops as revs increase higher up
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Old 08-08-2009, 03:27 AM   #15
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those etecs are fantastic
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Old 08-08-2009, 08:56 AM   #16
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those etecs are fantastic
Not when they keep going in to guardian mode .
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Old 09-08-2009, 12:08 AM   #17
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Not when they keep going in to guardian mode .
Why do they do that? Over revving or water pressure?

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Old 09-08-2009, 11:37 AM   #18
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ours has never done that, had lack of water pressure once (had engine too high) but just alarmed and said reduce throttle
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Old 09-08-2009, 12:45 PM   #19
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air lock in the oil system will also go into safe mode, the diagnostic software should tell you the fault.
evinrudes are great engines once you get to know them, i know a few of the offshore lads who had problems with the opti's going into safe mode too.
the pros far out weigh the cons with new motors.
I picked up a bag on the thames once, egine overheated and shut down, just turned off, removed bag, let motor tick over for a while and away i went, if that was my old carbed mototr i am sure it would have gone bang.
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Old 09-08-2009, 03:33 PM   #20
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graph

That comparison graph is very interesting where did you get it?
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