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  1. Tuloko77

    Forward bilge pump

    A little aside from this topic… but Holty, do you have any knowledge of any foam beneath the helm and companion seats? I am curious if there is any water in there…it looks like it could easily get in the through the hole on the deck where the quick release pin holds the seat supports in place...
  2. Tuloko77

    What would you use and how would you get these stickers off?

    The previous owner took those same stickers off of my boat. There is some ghosting but it really takes the right light to notice it. Most people won’t notice..
  3. Tuloko77

    1998 Mackinaw Cummins Stock Prop

    Great info, much appreciated. I’ll report back once I get things decided upon.
  4. Tuloko77

    1998 Mackinaw Cummins Stock Prop

    Fiddler, was the 17 x 15 you installed a 3-blade? I see Acme does make that size in a 3-blade.
  5. Tuloko77

    1998 Mackinaw Cummins Stock Prop

    Fiddler- Thanks so much for the information. To start, it looks like I have the stock prop, a 17 x 17 Michigan. It's got some decent pitting though and I wonder if that has affected my max RPMs. Since I purchased the boat, I also stripped the very light layer of paint on the bottom and added a...
  6. Tuloko77

    1998 Mackinaw Cummins Stock Prop

    Yeah, I’m never running against the pins. Generally, I’ll cruise around 2,000 if conditions permit, occasionally bumping it up for short periods. Really, the engine runs great but I just want to get it into spec one of these days, and get a slower idle speed. I’ve got a new laser tach coming...
  7. Tuloko77

    1998 Mackinaw Cummins Stock Prop

    As always Mistress, thanks for chiming in. Yep, I can achieve 2600+ in neutral. Do you think the 17 x 17 is 20% more than the 16 x 17, and should be adequate?
  8. Tuloko77

    1998 Mackinaw Cummins Stock Prop

    Ok, I’m at the point where I’m ready for a new prop. Currently have a Michigan 17x17. Engine is a Cummins 210 with a 1:1.22 gear, and I’m only able to get 2,500 plus RPMs rather the the 2,600 the engine is rated for. I am shooting for 2,700… in older posts, I’ve read that the mackinaw come...
  9. Tuloko77

    1998 Mackinaw

    Found while scanning craigslist https://detroit.craigslist.org/mcb/boa/d/clinton-township-1998-shamrock-trailer/7521358011.html
  10. Tuloko77

    Prop size

    Joel, It sounds like we have a similar setup... My 1998 Mack with a Cummins 210 and a 1.22:1 gear has a 17x17, 4 blade. I feel I am a little overpropped however, as I can only achieve 2,500 RPMS WOT. If not overpropped, then I'm likely having a fuel delivery issue... What is the pitch on your...
  11. Tuloko77

    26 ft Cummins 6bt

    I initially thought that could be a culprit but Valley Propeller in Ventura says it is galvanic corrosion. Looks comparable to this: https://propspeed.com/media/news/news-item/2020/12/09/corrosion-a-boat-owner%27s-greatest-fear It is a nibral prop… I appreciate the offer of trying yours and...
  12. Tuloko77

    26 ft Cummins 6bt

    I have a 4 blade, 17 x 17 Michigan Dyna Quad. I haven’t begun looking at new props yet, but eventually need to. I had some galvanic corrosion on my prop this spring (see photo). Before I went to get a new one I wanted to make sure I resolved the source of corrosion, which I have. My gear is a...
  13. Tuloko77

    26 ft Cummins 6bt

  14. Tuloko77

    26 ft Cummins 6bt

    Better late than never…. Wide open in neutral I get just under 2800 RPMs on the tachometer. Now I need to shoot it with a photo tach…
  15. Tuloko77

    Fuel Stick 1998 Mackinaw

    Update- i Discovered the easiest way to get some answers. I pulled off the fuel fill shroud and was able to get a measurement of the gunnel side of the tank, and what do you know it was about 6-6.5”. On my boat, I have a 6” round hatch in the floor panel covering my starboard side tank. Through...
  16. Tuloko77

    Fuel Stick 1998 Mackinaw

    I just can’t figure out why I’m only getting a reading of 6.5” when full- or when fuel spits out the vents. It’s the same on port and starboard tanks. I’ll have to pull up the floor sooner or later and check my tank…
  17. Tuloko77

    Fuel Stick 1998 Mackinaw

    Would anybody here be able to take a picture of their fuel stick next to a tape measure for me? Mine did not come with one, and I would love to have one with the correct markings. I assume the gasoline and diesel tanks are the same, I have a Cummins diesel. Everyone says I should be able to get...
  18. Tuloko77

    26 ft Cummins 6bt

    I want to say around 750… I know it idles less than 800. I’d love to know what that tells you. I’ll confirm this weekend. And I checked it with a shitty RPM gauge and it still seemed just under 2,600, but not sure how much I trusted that gauge. I generally cruise around 2,000 so if I am...
  19. Tuloko77

    26 ft Cummins 6bt

    For what it’s worth, I’ve got the same engine and an old Michigan 17 x 17. I’m maxing out at 2,550 rpm’s, and plan to get a new prop in the not too far future. I have some minor pitting on the prop and have bottom paint. I’m guessing without that, I’d be able to achieve 2,600 or more, what the...


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