building a new flame sucker

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madjackghengis:
Hi all, actually Stew, it used to be, but is now inert, but can be revived if'n govment agents start nosing around here abouts. We don't much like govment agents and revenuers :bugeye: This kind of valve is sort of like one on Gunther Bettinger's web site bettingue.blogspot.com, but built with the odds and ends I had on hand. I can't discard a CD player or other piece of mechanical or electrical devise without gutting it for "spare parts", and I feel like I'm recycling at the most efficient level, by re-using parts in their original form for a different purpose. I knew I had that 2.5mm shaft and two tiny bushes that I broke out of the plastic carriage, and they slide very nicely with just about the right distance for full opening and closing.

The valve carrier needed an extention to meet with the lever and to give both a connection to the actuation lever, which will be a pin through a hole, and a place for a spring to press against, to keep the valve in contact with the head. I found a spring clip from a pocket knife which had some three tiny #1-56 screws, so the valve carrier got drilled and tapped for the three screws, and the spring clip installed. It is cut off later, when the lever is in place to give a good place to cut it off at

with a stanchion in place on the crank structure, a bushing is turned to fit over it, with end clearance for the E-clip which will hold the lever in place. The bushing is turned with a 5/16ths bore, a 1/2 in o.d., and a 7/16ths step and shoulder for the lever to press onto, establishing its place relative to the cam shaft, and the valve carrier.

turning the shoulder on the bushing

cutting off the bushing, I chucked it lightly after cutting off and trimmed it to proper length

the valve lever blank is a piece of 1/4 by one inch 6061, step drilled for the bushing, up to the 7/16ths as I don't have that size reamer, the last two drills were only a fifteen thousandths under and apart, so the hole came out dead on size with the final drill

Once the pivot hole was established, I measured from the pivot to the mainshaft, and eyeballed the offset for the cam roller pin, putting it as close to the edge as good engineering allows. The roller is a bearing with a 3/16ths i.d., and a 1/2 in o.d. The pin is a rod bearing roller from a Harley rod loose bearing set, .0002 oversized, for a press fit.

once the holes were in place, I cut off the excess with my bandsaw, and filed to a fine finish. The valve end is still to be cut to length, a pin put in the end, to fit in a hole to be drilled in the valve carrier extention, and a small coil spring on the pin to provide pressure on the end of that extention, and keep the valve face against the head, while the valve moves. The end of the arm needs enough cut off to make room for the spring, with the end milled flat to be drilled for a pin about 3/4 in long to both move the valve, and carry the coil spring.

the almost completed valve operating lever with bushing and cam follower bearing in place

the valve lever in place on the engine

a side view of the lever in place. Now that this is done, I can calculate where the pin must go in the lever, where the hole in the valve carrier extention must go to match the pin, and then turn a cam with provisions for adjusting valve opening and timing, an adjustable cam if you will. Not to be confused with the variable cam timing put in Nick's car, which seems to be a really bugger of a problem. Hopefully this answered some questions, and opened up some new questions, one can at least hope :poke: :lol: mad jack

winklmj:

--- Quote from: sbwhart on January 07, 2011, 04:50:06 AM ---I hope that pineapple isn't live

--- End quote ---

Will be used only if the engine doesn't run.

Stilldrillin:
Your last post answered several unasked questions Jack! :scratch:

You're doin' well. Keep on doin! :thumbup:

David D

cidrontmg:
Coming together fine. I have not yet figured out which way it will stand when finished. That is, if it will be (cylinder) horizontal or vertical. Or at some angle. But the pieces look like they mean business! Sturdy and to the purpose, the way I'd like to build my engines :med: It's not missing much before the first smoke.
:wave:

Rob.Wilson:
Hi Jack

Watching this build with allot of interest ,,,,,,,,, great stuff :thumbup:

Rob

Were dose the hand grenade go :scratch:

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