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mike
Steambird
Tue Aug 8, 2017 09:53
108.26.69.135

I have that book too. I know some British inventor did fit a steam engine into an airframe tethered to a short stretch of rail which developed enough lift to break free - if memory serves? Sir George Cayley?? I could look it up but it doesn't matter anyway maybe I'll make reference to it later.

One of the things that attracted me to two strokes was that they could reward your experiments assuming they had some basis in reasoned analysis of a problem along with whatever solution you decided to try. Whereas with four strokes its all cut and dried - more or less. Most of what worked was known, the rest was a matter of improvements in metallurgy, engine layout, systems innovations and so forth. Not that these are unimportant!

However the two stroke could reward the small guy who had persisted in carefully investigating by trial and error and making small alterations to the various aspects of the engine, enough that every so often people like Degner could field a race bike that astonished the competition.

Two gentlemen come to mind in this regard. L.J.K Setright and Gordon Jennings, Setright reported on the various improvements, Jennings made them happen. I put some of his ideas to work and the improvement was noteworthy. Jennings best fix was the 'cheap car coil' and the re-sited condenser fix.

He pointed out that mcycle coils were invariably poxy little things, underpowered and placed right above the engine where they could get ruined by overheating. Condensers HATE heat so why put them inside a small enclosure hard up against the crankcase.

You could go down to KMart and buy a generic car coil for ten bucks or so, clamp it to the frame front downtubes and be rewarded by a monster spark that could burn through anything, no more fouled plugs and a better response and less pinking from a delayed flame front thanks to improper ignition of the charge.

Ditto the condenser, get yourself a nice fat car one made in America, fix it to the lower frame tube under the engine run the wire up to the points assembly and all your points problems are solved especially if you can locate a suitable set of truck points which were platinum tipped for long service life. Or go for a walk in the scrap yard find/swipe a good set (usually the guy isn't bothered about the small stuff) and unsweat them and put them on your points in place of whats there.

Transforms what was already a good engine the Suzuki 500 Titan and gives it an edge it lacked plus no more plug fouling and points adjustment and cleaning which you otherwise had to put up with on a weekly basis. Now it ran better all through the rev range, would idle all day without fouling and hold full power without fading.

  • That being the case... - Sarge, Tue Aug 8 06:59
    "I love them" ...you should stick with that as a story element. However... I raise the question from a grave suspicion there must be a reason why, with all the advantages of weight and power output,... more
    • Steambird - mike, Tue Aug 8 09:53
      • For bikes and cars... - Sarge, Tue Aug 8 11:38
        ...I'm with you on two stroke being viable, and in some cases advantageous. Can't have rallyed a Saab 96 without marveling. I well remember the two vs four schools in bikes, though I understood my... more
        • Well that just makes things better - mike, Tue Aug 8 14:15
          Do you know that I hadn't considered those aspects of the changes in atmosphere that you spoke about? Should have done though but I simply dismissed it as a problem similar to that of changing... more
          • That's probably wise, BUT... - Sarge, Tue Aug 8 15:59
            ...you might not give up on the debate as a good character development tool. I suspect Colin, being the automobile fan, is a four cycle guy, and might hold user prejudices to that predilection. Then... more
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