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  1. Q

    Mercruiser 470 low compression on cylinder #4

    Sounds like a valve issue. And these engines are normally so reliable as well !
  2. Q

    140 w/ 470 drive RPM & MPH #s

    Good going. Most I’ve ever seen out a 3.0 on a normal 18ft bowrider was 44. Something mph GPs with a laser 2 on it. exception was from an old cvx16 with the old 140 3.0 and a pre alpha and ballistic prop. That was just shy of 50 gps. Not your average boat though. generally 40 would be the...
  3. Q

    Mercury Outboard 2017 150 Intermittent Missing

    Hi. You might think I’m daft..but hear me out and have a google afterwards of you like. so my 2016 115 CT (identical gearbox to you) started an apparent miss exactly like this. I had the exact same thoughts as you too. Only occasionally. Sometimes as if it would stutter and lose power for a...
  4. Q

    Mercury/Mariner Blocks Interchangeable?

    Different engine from the optimax as far as I know. I think the mariner magnum is an efi 2.0l thing is it not ? Optimax being a direct injection newer type ? Might be wrong. The mariners have different life span cycles over there from here.
  5. Q

    Vessel View Installation

    Always read such posts with great interest. I’m thinking of adding a flush plotter like a simrad into dash. Would like the gauges on that too. I wouldn’t get any more data that my smart craft gauges already say...but like the idea. I think I need a gateway between my network and the simrad.
  6. Q

    Is this the aluminum head 470.

    Most recent 3.0 are 140hp at prop. 470 was a maximum 170 at flywheel as far as I know. Even if it was at best at prop. That’s only 30. I’m not having a go. Speaking from a horrendous experience and many many ruined days out. Rebuild the thing twice and he eventually gave in. Dropped a 3.0...
  7. Q

    Is this the aluminum head 470.

    It doesn’t have 40 more horsepower at all.
  8. Q

    Is this the aluminum head 470.

    O Where you get the 40hp I don’t know. Even if it was perfect. thw upside is that your family will actually enjoy boating...if the boat is reliable and not getting towed back by your friends. You keep those friends too.
  9. Q

    How to connect remote fuel tank to Mercruiser 6.2L 300HP MPI IO

    Take the filter off and fill it with a 2 stroke mix. Or run the main tank as low as you dare and mix that. If you really want to go the remote tank way, pull the hose off the tank or off the filter inlet and run a hose into the remote tank. I’ve aways just ran the main tank really low and mixed...
  10. Q

    Is this the aluminum head 470.

    Ok. So as briefly as I can and trying not to **** off the 3.7 fans who like fixing their boats, more than using them... If you are trying to replace an originally fitted 3.7, then get a 3.0. They are the same fitment and a direct replacement. Worst case, it’s a prop change afterwards. A 4.3...
  11. Q

    Anybody hear of an Excel 175 speed boat

    Amazing. Yeah. Sure looks like a cvx16 for sure. Does it have a pad at the rear centre of the hull ? This is my Roger Clark extremely rare ‘84 Cvx16
  12. Q

    Mercruiseer Prop Hub removal

    Hi. If you buy a merc prop, it will usually come with a hub kit. Those props don’t look like merc props to me. If you get a black max (great props) it should come with. Generally not great practice to read use huns from one prop to another. Although I have done this myself, when swapping props...
  13. Q

    Another winterize question

    Just chemistry really. Reduce the oxygen and reduce the corrosion. No brainer for me. My boat has had this since new and not a sign of any flakes of rusted metal to block the drains.
  14. Q

    Another winterize question

    100% protects the block internals against cold corrosion, when filled with AF. No doubt about it.
  15. Q

    Another winterize question

    Do it by the manual. Which is neither of your two original thoughts. Drain...then fill with AF.
  16. Q

    Intermittent spark

    Change the battery. Very common.
  17. Q

    4.3 MPI Performance issue

    Those plugs aren’t that great on the mpi of it’s the ac delco platinum ones. Presume they are. Because you can’t gap iridium plugs. NGK 5599/5999. One of them. Can’t remember which, is what you really need. Maybe not the issue, but they defo don’t run well with just platinum plugs.
  18. Q

    4.3 MPI Performance issue

    Sorry if I’ve missed it, but what temperature is the engine running at ? If the t stat is sticking and running cold, they over fuel and run crap. Do you have the right iridium plugs in it too ? I remember the Diz cap was mentioned, was it replaced too ? By the way, your prop slip is incredible...
  19. Q

    Anybody hear of an Excel 175 speed boat

    I’m sure she will manage that at least. Very fast hulls.
  20. Q

    Anybody hear of an Excel 175 speed boat

    Be the smallest engine I’ve heard of on a cvx16 to be honest. Usually 115-125hp for USA built hulls and 115-140hp for U.K. rare Roger Clark models. Usually a v4 2 stroke was standard fit. A few guys have uprated the transom on them in us and running 150-200hp V6 2/ and will see late 60’s and...
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