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Thumper---A new 1 3/8" bore i.c. engine

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  • #61
    A quick google search for 35mm piston rings came up with multiple hits. Many at about $2-$3

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    • #62
      Since I am going to bore the cylinder and make the piston "to suit", it won't make too much difference whether it's metric or imperial. I have a number of things to do on the engine before the rings become critical. I would like to deal with the same guy at Ringspacers, but I'll have to wait and see if I can contact him. Hope the virus didn't get him!!!.
      Brian Rupnow
      Design engineer
      Barrie, Ontario, Canada

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      • #63
        Tiny Power have 1 1/4" and 1 1/2" rings but not 1 3/8". https://tiny-power.square.site/#JTVujb

        Geoff

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        • #64
          I just sent an inquiery to Debolt about his rings. There is nowhere on his order form to say that you are Canadian, so I sent him an email.
          Brian Rupnow
          Design engineer
          Barrie, Ontario, Canada

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          • #65
            I remember that. Three, four, or more feet of snow and the thermometer bottoms out - and keeps going further down.

            I do NOT miss it. Shirt sleeves here in SE Texas and I was tempted to turn the AC on in my shop. But I resisted; it's the only season when I can save a bit on the utilities. I did have the AC guy out today because my wife can't stand anything short of freezing cold when she sleeps.

            I'll be watching your engine build.



            Originally posted by brian Rupnow View Post
            I just snapped this picture of my truck in the driveway--I'm waiting for the plow to come. They are calling for more snow tonight, tomorrow and tomorrow evening.
            Paul A.
            SE Texas

            And if you look REAL close at an analog signal,
            You will find that it has discrete steps.

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            • #66
              I've just had one of those King Midas in Reverse days.---Everything I touched today has turned to crap!!! As a consequence, I don't have any nicely machined gears to show you.--On the plus side of things, I found a nasty old chunk of brass that was big enough to make the blank for the large gear. I have company coming to my little shop tomorrow, so I have to stop machining for the day and go into housekeeping mode. My shop and office look like a rats nest caught in a hurricane.
              Brian Rupnow
              Design engineer
              Barrie, Ontario, Canada

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              • #67
                Today was a much more satisfying day than yesterday. This morning I hosted a meeting of myself and two other gentlemen who's interests lay roughly in the same direction. One fellow is an engineer who operates a steam excursion train out of Huntsville in the summertime (about 70 miles north of where I am), and the other chap is from Wasaga beach and has a background in model trains and all things electronic. A fourth guy lives in Toronto and couldn't make it up to Barrie today. After they left, I set yesterdays gear blanks up on the mill and turned them into real gears. They seem to fit just fine where they are intended to.---In other news---Barrie got it's first case of Corona virus today, a man in his fourties who just returned from a trip to Germany. This scares me. They say it kills mostly old guys. Damn---that's me. I'm an old guy!!!
                Brian Rupnow
                Design engineer
                Barrie, Ontario, Canada

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                • #68
                  I decided today to make the support which is the pivot for the rocker arms a different way. I have changed it to a flat plate with two guide bushings for the lifters, and made up a different piece (colored grey in the picture) which attaches to the top of the cylinder head with three of the head bolts.
                  Brian Rupnow
                  Design engineer
                  Barrie, Ontario, Canada

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                  • #69
                    Brian- will the pink cross pins atop the lifter slide in the gold rocker arm?
                    If not, your going to have some binding.

                    So are you going to form a club with your new friends?

                    Sid

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                    • #70
                      As I look at this, I recalled a comment you made way earlier. You had suggested to have both fans blowing inward, for airflow reasons I do not recall.

                      Looking at the model I think that may not be a good idea, if you are still planning that.

                      What you may end up with is a stagnation of the air around the cylinder with opposing flows, so that there is actually poorer cooling, despite the two fans. Probably, in on one side and out on the other would be better.

                      If you have already decided that, and I just missed that, then please disregard this post.
                      CNC machines only go through the motions

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                      • #71
                        Sid--there is no binding. Jerry, both fans are moving the air in the same direction.
                        Brian Rupnow
                        Design engineer
                        Barrie, Ontario, Canada

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                        • #72
                          Originally posted by brian Rupnow View Post
                          Sid--there is no binding. Jerry, both fans are moving the air in the same direction.
                          So the pins do slide in the rocker arm end?

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                          • #73
                            Okay Sid--I see what you are talking about. The holes in the end of the rockers will be a very short slot.
                            Brian Rupnow
                            Design engineer
                            Barrie, Ontario, Canada

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                            • #74
                              Originally posted by brian Rupnow View Post
                              Okay Sid--I see what you are talking about. The holes in the end of the rockers will be a very short slot.
                              Yes. did the exact type of slot on the valve actuators for my Bernays engine

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                              • #75
                                Originally posted by J Tiers View Post
                                As I look at this, I recalled a comment you made way earlier. You had suggested to have both fans blowing inward, for airflow reasons I do not recall.

                                Looking at the model I think that may not be a good idea, if you are still planning that.

                                What you may end up with is a stagnation of the air around the cylinder with opposing flows, so that there is actually poorer cooling, despite the two fans. Probably, in on one side and out on the other would be better.

                                If you have already decided that, and I just missed that, then please disregard this post.
                                that was probably me. To be honest, at relatively low airflow and heat output, it probably doesn't make any difference which way the fans blow.

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