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Thoughts on Mercruiser 4.5 and 6.2

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  • Thoughts on Mercruiser 4.5 and 6.2

    Are these engines proven to be reliable? Any experience's? Pro's and Con's? I know they will be more to work on since mercruiser is building everything. Leaning towards 6.2 with 300hp.

  • #2
    6.2 is still a SBC....
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    The world takes on a whole new perspective when viewed from 100’ below.
    1972 Bertram ‘Bahia Mar’ 20
    2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
    (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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    • #3
      Originally posted by achris View Post
      6.2 is still a SBC....
      "SBC"?. Sounds like a TLA. Is this code for still a GM?
      '96 Larson 174 SEI BR. 4.3LX 4 bbl Weber s/n 0F786604. Alpha One Gen II s/n 0F709315

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      • #4
        Originally posted by andrewterri View Post
        Are these engines proven to be reliable? Any experience's? Pro's and Con's? I know they will be more to work on since mercruiser is building everything. Leaning towards 6.2 with 300hp.
        I have the same questions. Unfortunately the jury will be out on the 4.5 for a while. Which is a bummer for me since I expect to be buying a future boat in that displacement and hp. From what I've read on this forum, Merc's success with aluminum block I/O engines is less than stellar.
        '96 Larson 174 SEI BR. 4.3LX 4 bbl Weber s/n 0F786604. Alpha One Gen II s/n 0F709315

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        • #5
          harringtonav that is where we are at. We bought a boat last year for an unbelievable price with only 26 hours. it is a little smaller than we wanted and have the boat sold if we are ready to move up. we are looking at a Monterey 238ss with the 6.2. 4.5 is an option but 250hp seems a little light for that size and weight. I am worried about the reliability of the engines. I thought the 6.2 was mercruiser's design like the 4.5. I did not know it was a chevy block. Achris, have you heard if they are going to stop producing that engine like the 4.3?

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          • #6
            The Small Block Chevy has been around since 1955. Parts won't be drying up any time soon.

            Chevy/GMC are still sticking 6.2s in pickups.
            BOAT SPECS FORUM HELP STARCRAFT FORUM SHOP iboats
            Please, no PM's (Private Messages) regarding boat/engine problems.
            That is what the forums are for.
            Only forum/moderator issues will be answered in PM's.

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            • #7
              Even the 4.5 uses mostly stock Chevy parts. I'll bet Mercruiser got it right this time.

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              • #8
                Originally posted by aimlow View Post
                Even the 4.5 uses mostly stock Chevy parts. I'll bet Mercruiser got it right this time.
                Are you thinking 3rd time's the charm?
                1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
                1974 Glastron V-179, Mercruiser 140
                1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
                Manitoba, Canada

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                • #9
                  Originally posted by andrewterri View Post
                  harringtonav that is where we are at. We bought a boat last year for an unbelievable price with only 26 hours. it is a little smaller than we wanted and have the boat sold if we are ready to move up. we are looking at a Monterey 238ss with the 6.2. 4.5 is an option but 250hp seems a little light for that size and weight. I am worried about the reliability of the engines. I thought the 6.2 was mercruiser's design like the 4.5. I did not know it was a chevy block. Achris, have you heard if they are going to stop producing that engine like the 4.3?
                  Don’t even consider a 4.5 for a 23-24’ boat. And don’t fall into the trap of thinking “I don’t need to go that fast.”

                  The reliability of the 6.2 should be just fine if you take care of it.
                  1990 Wellcraft Eclipse 196
                  Mercruiser Vortec 4.3 0M322285
                  Alpha gen 1

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                  • #10
                    I know nothing about the 6.2 but I do have a 4.5 200hp version. Not what you want in a 23' boat, but here's a few comments on the engine. Mine is in a 18.5' bow rider. Engine itself runs amazing. Super quiet, excellent power, good on fuel. It does pull very good through out the whole rpm range, but the bottom end grunt is awsome. When we were shopping, 18 months ago, the 4.3 was no where to be found except in a few carbed versions.
                    Working on it was a bit of a challenge, since everything is different than the 4.3. Hah, there is an engine under all those wires and sensors, doesn't look much different than under the hood of your new car.
                    As for longevity, I cannot comment since we only have about 50 hours on it, but so far so good.
                    I'm not in the market for a bigger engine / bigger boat, but if I had to buy another one today, and the HP range pointed to the V6, I would not hesitate on the 4.5L
                    2016 Glastron GTS185
                    Merc 4.5L MPI, Alpha drive

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                    • #11
                      Thanks for you thoughts everyone and for your review cortes100. I am surprised Monterey has the 250hp 4.5L as the standard engine for a boat that heavy. I am not sure what the difference is between the 300 and 350hp 6.2 but for some reason you can not get the 350hp in that boat even though it is rated for 380hp. I am the same thought as everyone else, go for the larger engine if you have the choice. We have a large family and so I know we would need the higher HP. I really like the 4.3 we have now but at 220hp with the boat (20') fully load it takes some time to get up on plane. that's turning a 14.5x15 4 blade. Best I can do to stay in RPM range. The engine now has about 70 hours but I know that engine is well proven. I am glad to hear the 6.2 is too and sounds like the 4.5 is well on its way.

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                      • #12
                        Cortes100, It sure would be nice not to hear the whistle and engine noise the 4.3 makes. I have read and heard the 4.5 is really a smooth quite ride

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                        • #13
                          Originally posted by marc c View Post

                          Are you thinking 3rd time's the charm?
                          Lets see..470, VW diesel, ..isn't there another??

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                          • #14
                            Originally posted by aimlow View Post

                            Lets see..470, VW diesel, ..isn't there another??
                            Vazer
                            1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
                            1974 Glastron V-179, Mercruiser 140
                            1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
                            Manitoba, Canada

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                            • #15
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                              Originally posted by marc c View Post

                              Vazer
                              Lost me on that one...

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