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  1. Scott Danforth

    My boat sank, part II

    Get the motor hot wired and start it
  2. Scott Danforth

    3.0LX - Mercarb to Rochester ?

    Not a direct swap
  3. Scott Danforth

    Need Help From You Guys That Have Prop Efficiency Calculators

    Higher temps mean lower NOx
  4. Scott Danforth

    1977 18’2” BeachCraft Mercruiser 888 302Ford

    go thru the thread in my signature. I cover making non-skid
  5. Scott Danforth

    WHAT IS IT? Engine has no serial number plate. Either a Mercruiser 120 or 140

    you can look up the GM industrial engines by the casting number. the bore and stroke of the 3 liter (181 cubic inch) is different than the 2.5 liter (153 cubic inch) deck height is also different additionally the casting marks on the side of the block will tell you if its a 153 cubic inch or...
  6. Scott Danforth

    Speedometer Connected to GPS Device?

    VeeThree and Faria both offer GPS speedometers (VeeThree sells thru Sierra here on iBoats) I have 3 issues with GPS speedometers: they are only marginally more accurate than a pitot tube they cost more than a pitot tube they wont last 30+ years until I get bored with the look like a pitot tube...
  7. Scott Danforth

    Need Help From You Guys That Have Prop Efficiency Calculators

    its the same motor for 240 or 250 or if they sell it at 280hp, you just pay a bit more toward the warranty fund.
  8. Scott Danforth

    Carb Recommendations for 5.7L Vortec?

    guessing your boat is about #4000 dry, about #5000 wet the cam you have will require more CFM from mid-RPM up I would definately go bigger. you have more cam than I had with my vortec headed Small Block and I was feeding it with the 715CFM holley running larger jets pushing my 3600# dry...
  9. Scott Danforth

    Over Temperature Alarm Sensor Level?

    I would just order a water pressure gauge. No sensor. A good old fashioned $30 bourdon tube outboard water pressure gauge The water preasure sensors do not last in salt water, where the bourdon tube gauge will
  10. Scott Danforth

    Cobra Outdrive Sucked Up Some Sand

    Keep in mind you will have sand and debris in your engine water jacket to
  11. Scott Danforth

    Over Temperature Alarm Sensor Level?

    See post 12 https://forums.iboats.com/threads/generic-boat-wiring-information-updated-verified.726970/
  12. Scott Danforth

    Over Temperature Alarm Sensor Level?

    I posted links in the electrical forum stickies for sensor catalogs. However I suggest you install a water pressure gauge on the raw water side. With an HX, you will have burned a all the rubber bits in the exhaust for about 5 minutes before your switch goes off and alarm sounds. However with...
  13. Scott Danforth

    Will Any 4" 470 Heat Exchanger Fit?

    The 470 mercruiser HXs only fit the 470s While the bundle may be generic, the whole assembly is specific
  14. Scott Danforth

    Need Help From You Guys That Have Prop Efficiency Calculators

    Different motor technology than the lump you are used to. Its propped right. You need that motor spinning 5600-5800
  15. Scott Danforth

    1977 18’2” BeachCraft Mercruiser 888 302Ford

    you may want to price starboard. the cost went up nearly 100% over the past 5 months you cant use it instead of core and fiberglass. it also expands 5X that of your boat in sunlight. why not fiberglass, gel coat and non-skid or fiberglass and Line-X XS650
  16. Scott Danforth

    3.7 Mercruiser, Crank no start

    some of us are happy to be in the 19th century. our vehicles can run without computer chips from China
  17. Scott Danforth

    Mercruiser 454 Oil/PS Cooler Replacement Question - Loss Of Oil

    before I pulled it, I would remove the oil lines and pressure test it. at the factory, they are hydro-tested to 150 psi using an enerpac pump (because if you have a leak, it wont explode like Air can) they are also repairable by any radiator shop or heat exchanger repair shop.
  18. Scott Danforth

    5.0GL coolant hoses source

    there are no automotive equivalents for boat hoses. look up the part numbers, plenty to be found in the interweb.
  19. Scott Danforth

    Basic Android charting?

    Try Navionics. I cant see my phone in bright florida sunlight prior to it shutting down due to over-heat, so I bought a garmin unit years ago
  20. Scott Danforth

    Mercruiser 470 Coolant Loss and Milkshake Oil

    you have a 470 that means you will change head gaskets often (iron head on an open deck aluminum block guarantees failure) you will need to change cam seals and do a speedi sleeve (soft cam snout guarantees failure)
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