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  1. On my homemade Merc triples, adding a by pass (1...

    On my homemade Merc triples, adding a by pass (1 to 3 and 2 to both) greatly improved idle.

    On the 90 hp Merc triples those bypass passages are HUGE.

    Jeff
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    You guys got to be kidding! Lots of guys built...

    You guys got to be kidding! Lots of guys built these things and ran them for years--me, for example.

    What's a Dirty Thirty and how do you build one? Take a 44 cube power head, put a Mark 30...
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    Sticky: I too run CDI's similar ignition system on an old...

    I too run CDI's similar ignition system on an old Mark 78. That tiny spark coil of theirs bothered me, so I ran it with the much larger Merc coil (and it worked fine. Have yet to sea trail that...
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    Looking at a Milkshake...

    ..and not the kind you drink!

    Every time I yank the power head off my older Merc triple I see a whitish, ugly looking layer of...stuff. I'm wondering if this is common (and okay) since this motor...
  5. As I recall, the bozo who did the block set...

    As I recall, the bozo who did the block set clearance around .005 inched.

    These are forged slugs.

    Your procedure sounds like it does the same thing, but not hogging the ramp, which may not be...
  6. Wow! Thanks for your advice--which sure is...

    Wow! Thanks for your advice--which sure is different from theirs (as different can get!)I'd better make up lots of gas!

    For the 3/4 throttle and full throttle runs I might have change props...
  7. Need Advise on Breaking in new pistons and rings

    Bored my Merc triple block .040 over and installed all new Wiseco pistons and rings. Since it was a "bit expensive", I looked up Wiseco's break in procedure and intended to follow it to the letter....
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    He looks really good. I filed his info for...

    He looks really good. I filed his info for future use--if ever. After 60 plus years of building and running hydros, the end is getting closer all the time. The mind is still willing, but the old...
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    ..."IMO hand grinding the sleeve will not be easy...

    ..."IMO hand grinding the sleeve will not be easy "

    That's why I didn't consider trying it. I DID relieve the piston with a pencil grinder and a file, and it WORKS! Had to take a bit more off in...
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    The steel liner needs to be ground away where he...

    The steel liner needs to be ground away where he didn't go far enough towards the end--it's not aluminum, unfortunately. I can cut away material off the piston for clearance.

    I can visually see...
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    I thought my problems with this bore job was...

    I thought my problems with this bore job was over--NOT!!

    Assembled the crank, rods and pistons into the block, then turn it over. CLUNK! The # 2 (center piston) locked up solid before hitting...
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    The saga continues.... Bought two more .040...

    The saga continues....

    Bought two more .040 pistons for the build then ordered new rings from Wiseco, but they sent me the wrong ones!

    Augh!

    Jeff

    PS: It's been my observation that a...
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    ..."Next time get a different machinist." You...

    ..."Next time get a different machinist."

    You said it! That fool cost me hundreds of dollars.

    Jeff
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    He had the boring bar set for .040 on the top...

    He had the boring bar set for .040 on the top hole, to clean it all out, so.... Bored all three of them, the moron, and without bothering to call me first. I had to buy two more .040 pistons for...
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    ..."Not good your machinist went 40 without your...

    ..."Not good your machinist went 40 without your permission."

    You said it! I was pissed.

    ..."Does he have lots of experience with blind bores? Does he have lots of experience with blind...
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    My boring service guy cleaned up the bore at .030...

    My boring service guy cleaned up the bore at .030 on two holes and went to .040 (without my knowledge or permission) on the third hole. All three bores look perfect, so idle and shifting into gear...
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    The largest overbore sold by Wiseco is .040. I...

    The largest overbore sold by Wiseco is .040. I have heard of .060 over slugs being used, however.

    Jeff
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    A clarification: How big a bore out is...

    A clarification: How big a bore out is acceptable without incurring liner warpage and other problems?

    Trying to save an old Merc.

    Jeff
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    How big a bore is too big?

    1975 Merc triple (similar to in-line sixes). What's the maximum acceptable (ie: without problems) bore allowed on these motors?

    Thanks,

    Jeff
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    Sticky: Then...why is the exhaust on the right side? Is...

    Then...why is the exhaust on the right side? Is the photo reversed?

    "Inquiring minds want to know!"

    Jeff
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    Sticky: What is that? Exhaust on the right hand side? ...

    What is that? Exhaust on the right hand side?

    Jeff
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    Thanks! Happy Thanksgiving to all! Jeff

    Thanks!

    Happy Thanksgiving to all!

    Jeff
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    Thanks. I guess a little loose is best for...

    Thanks. I guess a little loose is best for racing.

    Jeff
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    Piston to wall clearance question

    I'm having an early Merc triple bored out .030 over and need to tell my boring dude what clearance I want.

    Looked in my genuine Merc manual and couldn't find it. Anyone have a spec?

    Thanks,
    ...
  25. Found a local guy in Lothian, MD who sounds like...

    Found a local guy in Lothian, MD who sounds like he knows what he's doing.

    Thanks all!

    Jeff
  26. Thanks. I'll keep him on the list. I'll ship a...

    Thanks. I'll keep him on the list. I'll ship a piston to whomever does the work so he/ she can fit it.

    Thanks!

    Jeff
  27. Need a Good Place to Get a Block Bored Out

    Anyone near the Chesapeake Bay/ Easton/ Baltimore area know of a good closed end block boring outfit? I need to get an old Merc triple bored out.

    Thanks,

    Jeff
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    I don't blame you! I've seen two photos of...

    I don't blame you!

    I've seen two photos of boats that launched OVER the roof of their towing vehicles!

    Jeff
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    Gotcha. Thanks. Jeff

    Gotcha. Thanks.

    Jeff
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    If I can ask a really stupid question... How do...

    If I can ask a really stupid question... How do you folks out there, with a similar looking boat as this one, keep if from shifting forward on your trailer? I note that, in this case, there's...
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    Horses and horsepower! A match made in ......

    Horses and horsepower! A match made in ... Idaho.


    Good luck, pardner!

    Jeff
  32. Thread: Skeg mod

    by Fastjeff57
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    At least you tried something new, so you and...

    At least you tried something new, so you and others know it wouldn't work.

    Kudoos for doing that, and nice welding work by the way.

    Jeff
  33. 40 mph is not slow! Good work. If my experience...

    40 mph is not slow! Good work. If my experience means anything, you'll pick up 4 to 5 mph with the cav plate at least an inch above the keel.

    Jeff
  34. Not a high speed hull--period. You might want to...

    Not a high speed hull--period. You might want to start looking around for something more appropriate. (Where I boat it's rough as hell, so a deep Vee is the ticket.)
    Your dogs remind me of my...
  35. ..." The flat bottom will beat ya to death on the...

    ..." The flat bottom will beat ya to death on the big lakes around here "

    You said it! Have the same problem where I boat. After moving to MD, I intended to build a tunnel hull until I did some...
  36. You could 'paint stick' the motor higher with a...

    You could 'paint stick' the motor higher with a strip of wood. Long as she's bolted on good it won't be a problem.

    Jeff
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    Just learned about that little trick (with the...

    Just learned about that little trick (with the light) or I would have used it.

    Motor is now running fine again, on its own. Still suspect the mystery problem will re-occur, but....

    Jeff
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    ..."Boy, the timing belt sure looks loose." ...

    ..."Boy, the timing belt sure looks loose."

    They usually are without the driven pulley!

    ...."...sticking of the throttle advance as well"

    I hand my hand on the distributor body itself as the...
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    ..."I assume not the ADI system because of the...

    ..."I assume not the ADI system because of the incompatibility of the top main cap and trigger system and you have a timing belt."

    You obviously know your stuff! That is exactly why I could not...
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    I meant serious ideas. Jeff

    I meant serious ideas.

    Jeff
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    Calling All Motorheads!

    This SOB of a problem has got me stumped.

    Background: Mark 78 converted to late model electronic ignition. Rebuilt the motor over the winter and fired it up. Motor started instantly, but it was...
  42. Mine also has strakes, including new set, since...

    Mine also has strakes, including new set, since it runs like a submarine--the bow doesn't come up at speed. (I'm working on it!)

    Jeff
  43. Damn but that sure looks like my homemade boat! ...

    Damn but that sure looks like my homemade boat!

    Good luck with her.

    Jeff
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    I suspect the manufacturer deliberately...

    I suspect the manufacturer deliberately restricted the rpm to improve fuel mileage--these things are gas hogs.

    Jeff
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    Neat, but I have to ask a question: How fast can...

    Neat, but I have to ask a question: How fast can a water jet boat go? There has to be some speed restriction on the jet drive sucking in water to blow out the back, right?

    Jeff
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    That doesn't answer my question, however. Jeff

    That doesn't answer my question, however.

    Jeff
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    What Happened with the 888 Project?

    That was looking good for a while.

    Jeff
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    How about running automatic tranny fluid instead...

    How about running automatic tranny fluid instead of thick grease or oil? Modern manual trannies use it to reduce friction and increase gas mileage.

    Jeff
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    Dingy Bob made me the driveshaft adapter used...

    Dingy Bob made me the driveshaft adapter used with the dual carb, external reeds motor on page one. He does nice work!

    Jeff
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    I've seen snowmobile motors used, bolted...

    I've seen snowmobile motors used, bolted vertically to a tower, but what I've always wanted to run is a rotary engine, say a Mazda two rotor. OMC messed with them years ago and they were fast.
    ...
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