Recent content by Gordon

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  1. Gordon

    Exhaust valve timing

    The point in my original post was that as designed it was not possible to get 115° valve movement so I was merely asking whether I should be aiming for the 25° BBDC or the 0° TDC. I am getting abut 80° total valve action which I have also verified via cad layout so I can get one or the other but...
  2. Gordon

    Software in the cloud

    With all of this discussion about Linux I will have to get back to trying it. I tried to use it a while back because I have a Dell Inspiron without a hard drive which no longer works because it keeps trying to update Windows 10 and there is not enough room for even the operating system. I was...
  3. Gordon

    Exhaust valve timing

    Thanks. I was pretty sure that closing at TDC was more important than opening BBDC. As noted closing BTDC will waste momentum by trying to compress gas which would actually shorten the intake stroke by needing to neutralizing this compressed gas prior to intake. I presently have it set so that...
  4. Gordon

    Exhaust valve timing

    I am working on a hit and miss engine from an existing design. Plans call for the exhaust valve to begin opening at 25° BBDC and close at TDC. I cannot seem to attain both of these so should I compromise the BBDC or the TDC? In other words should I make the begin to open at BDC so that it closes...
  5. Gordon

    Perkins 1/4 scale hit and miss

    Immediate problem solved. I finally redrew the parts in CAD and found a math error. I should have redrawn everything in the first place as I usually do. I catch many errors and misinterpretations that way. Usually the problem with the original drawings, as it was in this case, is that parts are...
  6. Gordon

    Perkins 1/4 scale hit and miss

    I have been building three 1/4 scale Perkins hit and miss engines. Apparently I am missing something and I cannot nail it down. The cam is only giving me about 1/32" of travel. This makes a very short exhaust stroke and a very touchy governor. That only gives an open exhaust valve from 0° BDC to...
  7. Gordon

    Another Atkinson Differential build

    As one of the folks who have spent far too much time trying to get one of these to run I hope that at some point we can figure our why some of these engines run and others do not even come close. Different designs seem to have only minor differences.
  8. Gordon

    Atkinson Differential Engine - Making it work?

    That is different than the design I partially used. The design i partially followed was by Brooks Pendergast. I also would like to see the piston design. It sounds like it is completely different than either engine we have. See post #21 for a picture of mine.
  9. Gordon

    Atkinson Differential Engine - Making it work?

    I think that you are correct on your vacuum theory if there is no firing. Unburned fuel keeps accumulating until it is super flooded. I tried running the engine in reverse and that did not work. It had better compression in reverse rotation but it did not fire. I did find that the engine...
  10. Gordon

    Atkinson Differential Engine - Making it work?

    Per the note: It is #60 drill. It is 1/16 dia x 7/16 dp and then drill #60 through to the #50 hole on the top. The #60 is actually the fuel passage into the main body. The #60 in the side is actually the jet. The jet must be pointed downstream. Yes the .190 hole is sealed by the hex of the...
  11. Gordon

    Atkinson Differential Engine - Making it work?

    The carb needs high speed air flow because there is such a short intake cycle. Attached is the carb I finally had the best luck with. I used 1/4" throat dia but since the throat is constricted by the main jet the air flow is high speed. I give no guarantee that anything will work on this...
  12. Gordon

    Atkinson Differential Engine - Making it work?

    With my engine getting fuel to the combustion chamber was not the problem. Flooding was the problem. I turned the engine over via Gingery method of a V belt to an electric motor which allowed fine tuning fuel mix on the fly. When I got it running for short periods the fuel mix adjustment was...
  13. Gordon

    Atkinson Differential Engine - Making it work?

    I would be inclined to think that the spring tension on the intake valve would be too high, not too low. When you turn the engine over do you get a good suction at the intake? If you have good suction it should draw fuel into the cylinder. Correct mix is a different question.
  14. Gordon

    Silver solder or braze

    Yes.I did the job with the high temp 45% silver solder/braze. The problem is the difference in terms between different cultures. In UK chips are what we in US call fries and what we call chips are crisps in UK. Neither is wrong but just a difference in terminology. In the US there is brazing...
  15. Gordon

    Thankful

    I just want to express how thankful I am and I am sure most others are also that we have a home work shop where we can still go to the shop and build a new project, tweak an old project or just fool around. All of us would have obtained more raw stock if we had known what was ahead but we...
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