Moderator: Mike Everman
Jmitchell wrote:Will the old "Svelt Lady" cone sheet work for this? I fabricated a cone for that, and never got around to building the rest of it, but want to build this one.
Ben wrote:It seems like a lot of welding. What do you see as the disadvantage to having the intake running paralell to but not touching until it bends into the chamber, like the Chinese or Logan or NRL?
ed knesl wrote:Larry, I always like simlification and your design is that !
Ben's comment is understandable - reason for Larry's approach is
avoiding welding under such sharp angle betw. intake tube and the cone,
so it may be easier to go all way around.
Good design, Larry, I might put one together and that would be stainless.
ed knesl wrote:OK, Larry,
From now on, no more paper engines - everything must me METAL.
That will teach you !!!
Next time try air nibbler or 4in grinder with cut off wheel, in both cases distortion will not be a problem.
Larry Cottrill wrote:Now I have to make the front dome. That's a lot smaller, but it will be harder to cut AND harder to roll, because of the very blunt conical shape and almost no clearance at the "small end" (where the plug mount goes). I'll get it done, somehow. I'll probably start by drilling and filing the center hole, then shear cut the rest. I have the pattern cut out and ready to use.
It occurs to me that an awfully nice thing to do would be to go ahead and cut out sheet metal patterns, so more of these chambers could be easily made in the future. But, I'll probably never get around to it, of course. If I want production, it would make more sense to contact Viv and Luc and try to talk them into cutting them in stainless ;-)
ed knesl wrote:Larry,
I would drill a small pilot hole in the middle, then cut the dome shape,
weld the dome, weld the dome to the chamber and last drill the hole
for spark plug and weld the plug threaded insert.
The reason is to prevent heat distortion of the dome if plug insert gets
welded to dome prior to chamber connection.
I would make the dome thicker, at least 20ga, thin stuff will crack
around the plug from vibrations.
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