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Type: Posts; User: Recycled Flyer

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  1. Ray, are they standard cooling fins? Every DC...

    Ray, are they standard cooling fins?

    Every DC that I have seen has a single sided comp screw tommy bar and a post acting as a compression stop - as well as spanner flats.
  2. I don't understand why the engine stopped hard? ...

    I don't understand why the engine stopped hard?

    Crank case expansion jamming the prop driver up against the casting possibly?

    If that is the case then it must have been set up tightly to begin...
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    Yep, theoretically this would be the best in a...

    Yep, theoretically this would be the best in a dynamic and moving situation but sadly all references to Mariotte principles only show static and unmoving examples and in the real world air entering...
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    I think that here is the conflict, both points...

    I think that here is the conflict, both points are literally ON the same point.

    Any decent uniflow tank will theoretically have the pickup line and the vent ON the same point.
    Practically this is...
  5. PAW 60 conrod would be 22 pounds (according to...

    PAW 60 conrod would be 22 pounds (according to the web site.)
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    Nice drawings and I appreciate the trouble that...

    Nice drawings and I appreciate the trouble that you have gone to here.

    My 'interpretation' of these are -

    Pic #1 is that the fuel level is in fact even with the inlet vent not the physical...
  7. Wow! Wonderful idle with the 40!

    Wow! Wonderful idle with the 40!
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    Hi Jenny, I thought that I covered...

    Hi Jenny,
    I thought that I covered that off with "Of course (uniflow or not) the recognised head level is still effected by G forces ............." so that the actual effect is still...
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    Well worded as usual Ray. Another point with...

    Well worded as usual Ray.

    Another point with an inboard mounted tank is that (obviously) it will force feed the engine in level flight but this effect lessens the more you climb the circle as...
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    Except here we are discounting the VERY common...

    Except here we are discounting the VERY common control line use of the uniflow setup that just about ignores the changing level of the fuel and instead 'looks' at the fuel head as being a fixed...
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    Was totally unaware that the church sanctioned...

    Was totally unaware that the church sanctioned compression ignition!?
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    By any chance is this 'tight fitting' cylinder...

    By any chance is this 'tight fitting' cylinder been caused by the muffler or it's strap being clamped on too tightly?
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    Glow heads definitely shown here Ray....

    Glow heads definitely shown here Ray....
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    Front end looks Enya, the block (or 'Bloc') looks...

    Front end looks Enya, the block (or 'Bloc') looks Russian or East German and the screws look just plain cactus!

    P.S Uctkam rings a bell.
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    Lustrox made by Fox was purpose made for this but...

    Lustrox made by Fox was purpose made for this but I would think that any compound that is suitable for glass polishing would work also.

    Cerium oxide or 'jewelers rouge' would be my choice.
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    Always wondered about why making the lower...

    Always wondered about why making the lower crankcase as small as possible volume (or maximising the pumping ratio) is supposed to be the ants pants in tuning?!

    Doing so limits the amount or...
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    Just having reread all of this I realized that...

    Just having reread all of this I realized that there is an uncanny parallel between this new contra piston design and tapered cup expansion plugs or "Welch Plugs" that are used in full sized...
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    Thanks Steve, I must have read that wrongly and...

    Thanks Steve, I must have read that wrongly and stand corrected.
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    Could not the void be taken up by screwing the...

    Could not the void be taken up by screwing the threaded stud further back?
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    And just to confuse things even more this very...

    And just to confuse things even more this very good Aussie engine builder has indeed devised his own design contra pistons that install from the top of the liner! :)
    ...
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    The reason why (as told to me by a very good...

    The reason why (as told to me by a very good Aussie engine builder) is that a used engine will collect carbon crystals in the combustion chambers rim between the contra and the cylinder wall.
    ...
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    Bob seems to be good with his bitza's Ray, thanks...

    Bob seems to be good with his bitza's Ray, thanks for sharing.

    (The Fox 15 seems to have an impressively looooong crankshaft thread too!)
  23. Acetone and a mineral wool pot scour pad will...

    Acetone and a mineral wool pot scour pad will remove varnish so I can't see it failing against the shorter polymer chains of gum.
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    The link above above tells me that it can use a...

    The link above above tells me that it can use a 15X9" prop at 5500 rpm!

    That's pretty serious lumber for a 4.5cc engine!
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    Nice find Fiery but at an average price of 300...

    Nice find Fiery but at an average price of 300 pounds I wonder what the sales of them are going to be like?
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