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The weather was nice on Tuesday, and I have a lot of comp time built up at work, so I took the day off. First I did an engine run with the cowling removed, to see if I could identify where the oil leak is at the front of the engine. It looked like it might possibly be coming from the seam between the two crankcase halves. I checked the torque on all the bolts that hold the two halves together in that area, and they were all up to spec. I'll attack this problem again when I do my annual inspection in October.Then I put the cowling on and went flying. Everything is working great! It was wonderful to get airborne again, and for a bonus there were a lot of clouds around to chase. And the landings were better than average too. All in all it was a great day.

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  • Hello Kevin,

    I am currently installing my Vertterman exhaust on my IO-
    375, it fits fine. But I noticed my stainless is 0,035 inch not
    0,049 , and there are reinforcement patches at the flanges
    of only two of the four pipes. Sent Larry an email on this to
    ask if I should be returning them to get them «upgraded».

    I notice that in 2009 you modified your installation using
    springs instead of the supports supplied by Vetterman. I
    also noticed that you were hanging the supports, and now
    the springs, from the engine mount rather than from the
    engine oil sump as per Vetterman's instuctions. How is this
    installation holding out? Is it possible that the crack that
    developed at the flange was (at least partly) due to the
    relative movement between the tail pipes/engine mount and
    the engine? I realize there is a joint in between each tail
    pipe and the «Y» joining the cylinder exhaust pipes, but is
    this enough to absorb the differential movement?

    Also, I was wondering where you purchased your MT
    counterweighted prop? I am getting ready to purchase
    mine, albeit a two blade, in the coming months.

    Thanks in advance for the info (and the encouragement re
    my recent milestones!)


  • Norm,

    As I understand it, 0.035” is standard for these exhausts. Larry only uses 0.049 for repairs. It is too heavy to use as standard.

    When I bought my exhaust system, Larry was recommending that it be supported from the engine mount tubes. I used his supplied hardware and support recommendations. But, I had two failures of the Adel clamps, so I switched to the springs.

    Larry later changed his recommended support location to the back of the oil sump, which I believe is a much better design, and my use of the earlier design may have been a contributing factor in my crack. Unfortunately I have a lot of stuff in the way, and I would need to move a bunch of things around before I could switch to this type of support. I plan to do that sometime.

    The MT prop was ordered from RV builder Jim Ayers:

    Less Drag Products, Inc.
    1921 Dorrit St.
    Newbury Park, California 91320-3408
    Attn.: Mr. Jim Ayers
    Phone: (805) 795-5377
    Fax: (805) 499-8646
    E-mail: jim@lessdrag.com

    There are many other possible places to order the prop from, including several in [url=http://www.mt-propeller.com/en/entw/services_can.htm]Canada[/url].

    Kevin Horton

    Comment last edited on about 5 years ago by Kevin Horton
  • Thanks Kevin for the info. Glad you enjoyed the Killarney
    trip... I see that you were not the only RV!