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Author Topic:   275 Mercury Cosworth ?

aquaman posted 12-12-2004 11:07 PM ET (US)
I think my 1994 240 Outrage may have originally been rigged with a 275 Merc (Cosworth?) Does anyone have any information on the 275hp that was offered by Merc in the early 90'S? I think it may have been a cast iron block. Several years back I had thought seriously about buying a boat with this engine, and shied away from it because I knew so little about this engine. Has anybody on the forum ever owned this engine, if so, what kind of experience was it?
captbone posted 12-12-2004 11:33 PM ET (US)
It is the 3.4 liter V6 Mercury/Mariner Engine block with certain mods to make it a Cosworth Engine (blueprinting, I think). This 3.4 liter engine has been around since the early 1980's and is an great motor. The 3.4 liter came out as a 300hp in 1982 or 1983 and was the same motor(they dropped the hp to 275hp) until the mid 1990s when they dropped the 3.4 liter from the line up in favor of the 3.0 liter. It was heavy 575lbs and a very strong runner even not being a Cosworth. I heard that it was one of best motors in turn of lack of warranty claims. I like the 3.4 liter because it is so big it alway draws attention, but then again that why I love the v8 3.6 and 4.0 liter OMCs. The biggest draw back to owning a 3.4 liter Mercury is the parts are very hard to come by. The best bet is to buy another 3.4 liter to use for parts. Just my 2 cents
LHG posted 12-13-2004 04:20 PM ET (US)
When Mercury came out with the 3.4 liter, which was their answer to the V-8, they said it would outperform the V-8, even with just 6 cylinders. I have no idea if this was true. Sal might know the story here.
The engine was short lived, because they discovered they could come out with a smaller 60 degree 3.0 liter V-6 engine that would outperform the 3.4, which was a 75 degree V, I think.
Indeed, the 3.0 liter 2 stroke has options up to 300 HP at the prop, which was barely what the 4.0 liter V-8 could muster
Chuck Tribolet posted 12-13-2004 06:08 PM ET (US)
And maybe they discovered the hardway that a 75 degree V6
isn't inherantly balanced like a 60 degree V6.

Chuck
Tom W Clark posted 12-13-2004 08:35 PM ET (US)
The Mercury 275 was a dog. Highly unreliable. I think it was just too much horsepower from that block. There are VERY few of them left running; most have self destructed long ago.
My friends on Cape Cod originally had one on their Mako 24 but one month after the warranty expired, it threw a rod. I was told that was a fairly common occurrence.
captbone posted 12-13-2004 09:31 PM ET (US)
I guess it is pretty much who you talk too! I have been around these engines alot and I have heard nothing but great things about these motors, they were around for 14+ years in production but lost out to the 3.0 liter because of size and weight. The cosworth engine is even a step above the stock 3.4 liter so it could only be better. The biggest problem is just finding parts. Just my 2 cents.
captbone posted 12-13-2004 09:33 PM ET (US)
The Yamaha 3.1 liter v6 (one of greatest motors) is a 76' degree block.
jaccoserv posted 12-14-2004 12:17 AM ET (US)
What is Cosworth? A tuner perhaps?
hauptjm posted 12-14-2004 02:37 PM ET (US)
Cosworth has been around forever. They have always been big in the competitive auto racing arena.
http://www.cosworth-technology.co.uk/index.htm

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Author	Topic: 275 Mercury Cosworth ?
aquaman	posted 12-12-2004 11:07 PM ET (US) I think my 1994 240 Outrage may have originally been rigged with a 275 Merc (Cosworth?) Does anyone have any information on the 275hp that was offered by Merc in the early 90'S? I think it may have been a cast iron block. Several years back I had thought seriously about buying a boat with this engine, and shied away from it because I knew so little about this engine. Has anybody on the forum ever owned this engine, if so, what kind of experience was it?
captbone	posted 12-12-2004 11:33 PM ET (US) It is the 3.4 liter V6 Mercury/Mariner Engine block with certain mods to make it a Cosworth Engine (blueprinting, I think). This 3.4 liter engine has been around since the early 1980's and is an great motor. The 3.4 liter came out as a 300hp in 1982 or 1983 and was the same motor(they dropped the hp to 275hp) until the mid 1990s when they dropped the 3.4 liter from the line up in favor of the 3.0 liter. It was heavy 575lbs and a very strong runner even not being a Cosworth. I heard that it was one of best motors in turn of lack of warranty claims. I like the 3.4 liter because it is so big it alway draws attention, but then again that why I love the v8 3.6 and 4.0 liter OMCs. The biggest draw back to owning a 3.4 liter Mercury is the parts are very hard to come by. The best bet is to buy another 3.4 liter to use for parts. Just my 2 cents
LHG	posted 12-13-2004 04:20 PM ET (US) When Mercury came out with the 3.4 liter, which was their answer to the V-8, they said it would outperform the V-8, even with just 6 cylinders. I have no idea if this was true. Sal might know the story here. The engine was short lived, because they discovered they could come out with a smaller 60 degree 3.0 liter V-6 engine that would outperform the 3.4, which was a 75 degree V, I think. Indeed, the 3.0 liter 2 stroke has options up to 300 HP at the prop, which was barely what the 4.0 liter V-8 could muster
Chuck Tribolet	posted 12-13-2004 06:08 PM ET (US) And maybe they discovered the hardway that a 75 degree V6 isn't inherantly balanced like a 60 degree V6. Chuck
Tom W Clark	posted 12-13-2004 08:35 PM ET (US) The Mercury 275 was a dog. Highly unreliable. I think it was just too much horsepower from that block. There are VERY few of them left running; most have self destructed long ago. My friends on Cape Cod originally had one on their Mako 24 but one month after the warranty expired, it threw a rod. I was told that was a fairly common occurrence.
captbone	posted 12-13-2004 09:31 PM ET (US) I guess it is pretty much who you talk too! I have been around these engines alot and I have heard nothing but great things about these motors, they were around for 14+ years in production but lost out to the 3.0 liter because of size and weight. The cosworth engine is even a step above the stock 3.4 liter so it could only be better. The biggest problem is just finding parts. Just my 2 cents.
captbone	posted 12-13-2004 09:33 PM ET (US) The Yamaha 3.1 liter v6 (one of greatest motors) is a 76' degree block.
jaccoserv	posted 12-14-2004 12:17 AM ET (US) What is Cosworth? A tuner perhaps?
hauptjm	posted 12-14-2004 02:37 PM ET (US) Cosworth has been around forever. They have always been big in the competitive auto racing arena. http://www.cosworth-technology.co.uk/index.htm