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  • Engine mounts

    Any engineers in the house? I've got my new motor for the F22 project. The weight as pictured is about 246# and I'm wondering of the stock long mount is up to the task.
    Attached Files
    Dave

    F22 Experimental Build
    46 BC12-D
    N95078

  • #2
    Re: Engine mounts

    Where did you find an IO240? Are you using the O-200 mount? Tim
    N29787
    '41 BC12-65

    Comment


    • #3
      Re: Engine mounts

      Dry weight is 40# over an O-200 and you are limited to 100LL, maybe you can contact Terry Bowden, he is a DER and if you can get ahold of him he can help you. Tim
      N29787
      '41 BC12-65

      Comment


      • #4
        Re: Engine mounts

        Distant relative had it for a project and never ended up using it. When the time comes I might end up swapping out that massive alternator for a light weight one. I don't think I need 60A. That'll help a little with the weight plus if I use a Catto or Whirlwind, that'll be some more weight off the nose. Having thought a lot about it over the last few days, I might just get a short mount and build a jig so I can go just a couple inches longer vs. 4. I need some more fabrication anyway to help with the 51% rule. I don't trust my own welding but there's some older guys at my local EAA chapter that are Picassos with a torch.

        As far as 100LL, I'll be going into it cautiously but in the big stack of manuals and literature there was a booklet of FAQ that Mattituck included. Right on the front page....


        Can the TMX Series of engines be operated on automotive fuel?

        Yes, all of the TMX experimental series of engines, that use compression ratios below and including 8.5:1, can be operated on fresh automotive fuel that meets spec ASTM D-4814 and has a minimum 91 octane rating. The use of automotive fuel that is blended with ethanol or alcohol is not permitted. Engines that have been modified to use higher than standard compression ratio pistons or that are using electronic ignition that advances the ignition timing past standard specifications are not recommended to use mogas. Although the use of 91 octane automotive fuel will work in these engines, that practice should be limited and isn't endorsed.

        Edit> It's not that big of a deal of I do end up running straight 100LL. I know right now that it's only $.70 more than 91.
        Last edited by Nefj40; 06-30-2018, 15:34.
        Dave

        F22 Experimental Build
        46 BC12-D
        N95078

        Comment


        • #5
          Re: Engine mounts

          Hmmmmm....125, modern cylinder design, FI, angle valve cylinders with crossflow downdraft heads, light Catto or Whirlwind, and hopefully efficient exhaust (maybe 4:1 like CC?). What's not to like? Mix 100LL with top grade auto and fly the paint off the plane. Maybe these flaps (http://www.performancestol.com), extended landing gear from Alaska (they now make them for experimental), and LE VG's to finish the dessert.

          Gary
          N36007 1941 BF12-65 STC'd as BC12D-4-85
          72 is the new 62 so deal with it

          Comment


          • #6
            Re: Engine mounts

            It might be a while, but I think (hope) it'll be a nice one.


            http://www.aircraftspruce.com/catalo...ossover240.php

            I have a buddy that owns Vetterman exhaust, he could build me something also.
            Last edited by Nefj40; 06-30-2018, 18:57.
            Dave

            F22 Experimental Build
            46 BC12-D
            N95078

            Comment


            • #7
              Re: Engine mounts

              Originally posted by Nefj40 View Post
              It might be a while, but I think (hope) it'll be a nice one.


              http://www.aircraftspruce.com/catalo...ossover240.php

              I have a buddy that owns Vetterman exhaust, he could build me something also.
              That spruce one wont work without a lot of modifications, it goes too far back as it is currently is configured. I would find out from your buddy at Vetterman about what he can do that would fit right the first time. Tim
              N29787
              '41 BC12-65

              Comment


              • #8
                Re: Engine mounts

                I'm going to be changing jobs at the end of the year so the project is kind of on hold until after I make the transition.

                I happened to see on a continental web page that the above engine is #246 while the 0-200 is listed at #216 so I might be looking at only a 30lb increase stock. If I dump that huge alternator for a B&C and then go with a catto or whirlwind it's feasible that I won't have all that much more weight hanging than a stock 0-200 F19. A couple things that did pop up that will have to be dealt with is the big plenum on top of the case, and the prop flange sticks out 3 inches from the front of the case.
                Dave

                F22 Experimental Build
                46 BC12-D
                N95078

                Comment


                • #9
                  Might look at installing an ercoupe spinner to help with the prop flange issue
                  N29787
                  '41 BC12-65

                  Comment


                  • #10
                    Last month I spoke with Randy from Rans about this motor since he's got some experience with it on the S16 he built. He said it's a good motor but that it had extreme power spikes. When I quizzed him about what he meant, he said that he blew apart a wood prop from the power pulses. Time will tell if I use this motor or not.
                    Dave

                    F22 Experimental Build
                    46 BC12-D
                    N95078

                    Comment


                    • #11
                      Originally posted by Nefj40 View Post
                      Last month I spoke with Randy from Rans about this motor since he's got some experience with it on the S16 he built. He said it's a good motor but that it had extreme power spikes. When I quizzed him about what he meant, he said that he blew apart a wood prop from the power pulses. Time will tell if I use this motor or not.
                      ???? that sounds more like a prop design issue. There are wood props on much bigger engines with lots more hp.

                      Comment


                      • #12
                        Well, that's kind of what I thought. Diamond has been running Sens. props since they hung that motor on the Da20 airframe and I'm thinking that it's a wood core composite. They haven't had any problems that I'm aware of.
                        Dave

                        F22 Experimental Build
                        46 BC12-D
                        N95078

                        Comment


                        • #13
                          Please keep us up on the "power spikes" and prop failure. Sounds like we need more data. Wood props are usually much BETTER at taking power spikes. I am wondering if they clocked the prop incorrectly.

                          Comment


                          • #14
                            They are not spikes, they are power pulses...spikes are more like a surge....
                            N29787
                            '41 BC12-65

                            Comment


                            • #15
                              There's a IOF-240 on Barnstormers that came off a balled-up kitfox. It has the remnants of a wood prop, so I'm thinking that Randy had something going on with his prop selection or design that caused the problems.
                              Dave

                              F22 Experimental Build
                              46 BC12-D
                              N95078

                              Comment

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