Recent content by Texasmark

  1. Texasmark

    85hp Merc?

    The 3 cylinder is probably Loop Charged allowing for increased fuel economy. I will say this about my experiences with Cross Flow fueling methods vs Loop Charging methods......the CFs I owned were bullet proof and easy to start after sitting up between outings. My loopers not so.....a lot more...
  2. Texasmark

    How can I make my Tracker 40 HP faster?

    That engine height is excellent. The L in the ELPT identification is indicative of the long (20") mid section.....best I can tell you have a 20" transom in that boat so the height is OK fine!!! While I am here, the second picture shows the lever that moves the carb butterflies as the lever...
  3. Texasmark

    1978 50hp Mercury timing and synchronization

    Move your throttle lever back and forth and watch what moves inside the engine compartment. Usually at least one of the levers that move....one is for carb butterfly control and the other is for timing changes, sets the engine timing to set the idle speed (on some engines like mine) and the...
  4. Texasmark

    85hp Merc?

    I bought about a 1974 85 4 cylinder with PTT new. One of the finest engines I ever owned. One thing that stands out is in the winter I would pull up to the ramp, dip my trailer "properly" start the engine...immediate thing, and back off and secure, put my truck/trailer in the parking lot and...
  5. Texasmark

    Prop barrel slightly smaller than the gearcase

    I replied to your post but it wound up several listings below.
  6. Texasmark

    Prop barrel slightly smaller than the gearcase

    I think the physics behind this is similar to ported props. As soon as you reach a certain speed, water pressure from new water forces the exhaust to hug the hub, rather than being spread out over the blades like is the case at lower speeds where slip is significant.
  7. Texasmark

    Prop barrel slightly smaller than the gearcase

    Interesting. I don't know what I expected to see but apparently that works.
  8. Texasmark

    Prop barrel slightly smaller than the gearcase

    You mind posting a picture of that? I find that most interesting....in short, what does the engine do with its exhaust gasses as a result?
  9. Texasmark

    Prop barrel slightly smaller than the gearcase

    Along those lines, I "think" I have seen high performance props where there is no "tunnel" for gasses to exit behind the prop. What I don't remember seeing is what the LU casting looks like right in front of the prop......I recall early low HP Mercury racing hydroplane short shaft engines that...
  10. Texasmark

    Prop problem

    Since they are made of "cast" aluminum, cast anything metal and surely some other materials oppose flexing. I agree with "airshot" and figure the percentage at a single digit value. On the other comment by Cyclops222.........Prove it!
  11. Texasmark

    How do you screw into fiberglass/gelcoat without chipping?

    Well that answers the question why I first saw them at work. A lot of sheet aluminum was processed......5052 T6 if I remember correctly after being retired 20 years.
  12. Texasmark

    How do you screw into fiberglass/gelcoat without chipping?

    I have done that and I think this is the type bit I was trying to describe above.
  13. Texasmark

    How do you screw into fiberglass/gelcoat without chipping?

    When in industry, people who worked certain substances used a peculiar bit. It may be referred to as a "sheet metal" bit. Rather than having a chisel point where the cutting edge starts at the center and as it penetrates the material the bit is slanted and works its way out to the final...
  14. Texasmark

    Better hole shot for a jon boat.

    Turning Point brand Hustler are high performance aluminum props and some are ported. The port decreases the density of the water flowing over the blades on the hole shot allowing the engine to rev up faster hence get on plane faster......like lowering the prop's pitch just for the hole shot...
  15. Texasmark

    Prop Swap opinions...

    The tab is fixed as is the prop. Neither move from the set position. I have run as close as 1/4" with no problems.
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