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  1. #601
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    Quote Originally Posted by FMP View Post
    How did it look when the original pistons came out?
    a bit glazed, but not damaged in any way.
    By the upcoming weekend I should have it apart and by then I will post some piston pics.
    I’m still a bit puzzled by the disapearing JB Extreme Heat... I probably need to start look for small set screws iot re-stuff the idle reliefs. I don’t really like the idea of having metal pieces in the close vicinity of the moving piston, but I can see any other solution!? Perhaps automotive exhaust repair putty?

  2. #602
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    Did you power wash the hull and get water in the tank under the tank lid?

    Pyro-Puty 1000 is great but $ fir such a small use. If you wanted to do some work in the exhaust chest it could also be used there.
    Too small an area on the back side of the relief to get some real welding done?
    Or too tight to drill the relief and press fit a pug or thread one in, Allen head ?
    1/8 NPT Edelbrock 9129 Internal Allen Head Pipe Plug Fittings or might that lead to a crack? Maybe straight non tapered
    Last edited by FMP; 10-24-2018 at 05:45 PM.

  3. #603
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    Quote Originally Posted by Captain75 View Post
    I use a pretty simple method.
    By using the rigid hone you can feel in the operating hand when the bore has shifted from oval to round.
    Final size is determined by sliding the piston into the cyl upside down.(piston skirt being wider than the piston top) I use a feelet gauge to determine the play between cylinder wall and piston skirt. I have had the possibility to use a borrowed bore gauge in the past, now I have one heading my way by mail.
    You will also need a 4" or 100mm micrometer to go with the bore gauge. Measuring tools are really not that expensive compared to pistons.

    When all you have is feeler gauges then use a piston ring to get an idea of the taper. Push it into the bore different depths with a piston top and compare the end gap.

  4. Likes powerabout, gfinch, baja200merk, Captain75 liked this post
  5. #604
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    Quote Originally Posted by FMP View Post
    Did you power wash the hull and get water in the tank under the tank lid?

    Pyro-Puty 1000 is great but $ fir such a small use. If you wanted to do some work in the exhaust chest it could also be used there.
    Too small an area on the back side of the relief to get some real welding done?
    Or too tight to drill the relief and press fit a pug or thread one in, Allen head ?
    1/8 NPT Edelbrock 9129 Internal Allen Head Pipe Plug Fittings or might that lead to a crack? Maybe straight non tapered
    No water in the fueltank!
    Concerning the idle reliefs: Straight, non tapered Allen screws could probabably do the trick, question is weather std Locktite thread lock could cope with the heat?? Still can´t understand why the JB Extreme didn´t work when people on this board are using Marine Tex??
    I posed another question earlier (lot of q`s...)Do I have anything to gain by cutting the exh liner just below the flange? More space for the gasses to expand at take off!?

    Look forward to your thoughts and insights!
    Last edited by Captain75; 10-25-2018 at 12:17 PM.

  6. #605
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    +.020?
    Last edited by FMP; 10-25-2018 at 01:24 PM.

  7. #606
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    whats the story on your cooling system, does the engine get hot enough?

  8. #607
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    Quote Originally Posted by powerabout View Post
    whats the story on your cooling system, does the engine get hot enough?
    I haven´t had the possibility to instrumentally measure the temperature.
    The heads at least get so warm that it becomes impossible to touch them with bare hands...
    I am running a stock 2.7 cooling system, including the diverter valve that is linked to throttle/gear positions. The closed deck poppet valve has been replaced by a 6mm overboard outlet.

    FMP: +.020??

  9. #608
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    Quote Originally Posted by Captain75 View Post
    I haven´t had the possibility to instrumentally measure the temperature.
    The heads at least get so warm that it becomes impossible to touch them with bare hands...
    I am running a stock 2.7 cooling system, including the diverter valve that is linked to throttle/gear positions. The closed deck poppet valve has been replaced by a 6mm overboard outlet.

    FMP: +.020??
    Sounds warm enough then

  10. #609
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    Hoping you can reuse your pistons. How cold was your hose water during break-in. You ran two hrs on hose, no load?

  11. #610
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    FYI, I put standard JB weld in my bleed holes and ran all summer. Still great compression. Not sure why your Jb extreme didn't hold up.
    1975 Hydrostream Ventura II
    1987 evinrude 200xp

  12. #611
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    Intense heat on the inside...
    Click image for larger version. 

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    Cause: blow-by?
    I have not had a single lean snease!

  13. #612
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    Holy crap! What actually melted or what is that?

    Coating on the Reed cages?
    Last edited by mrichartz; 10-26-2018 at 11:04 AM.
    '84 Checkmate Convincor
    Twin v6 closed deck Evinrude loopers
    Heavily ported,2.7 heads,cooling mods
    milled finger ported to match vertex pistons,
    All casting slag removed
    Sleeves in opposite so no idle reliefs
    drilled/relieved exh, lower and mid,
    148 psi comp,balanced pistons and rods, Holley red,Stuffed,77d jets 106 pullovers
    CDI 8500 digital ignitions ..Boyesen reeds..And more....

  14. #613
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    Reed stop melted, reeds touched.

  15. #614
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    All cylinders?

  16. #615
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    I can't tell from pic on my phone
    That is actually the Reed stop in the first pic?
    How hot that have to be to melt it
    '84 Checkmate Convincor
    Twin v6 closed deck Evinrude loopers
    Heavily ported,2.7 heads,cooling mods
    milled finger ported to match vertex pistons,
    All casting slag removed
    Sleeves in opposite so no idle reliefs
    drilled/relieved exh, lower and mid,
    148 psi comp,balanced pistons and rods, Holley red,Stuffed,77d jets 106 pullovers
    CDI 8500 digital ignitions ..Boyesen reeds..And more....

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