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Take a small dish of sand and add some alcohol, see if that helps.

If I ever get the design down to a science instead of a "black art" its possible I might sell them. Flyback transformers at this voltage level are pretty touchy, and parasitic capacitance effects make it unlikely to be an easy project to complete as published.

I think I can squeeze it in, but its gonna be tight. A 1uf cap at 450v is not a smd component, and neither is the 1.25" toroid I am using at present. :( The depth is almost certainly going to be a violation. I will see if I can get a board made today or tomorrow.

Still trying to figure this out, those dimensions dont quite add up. Whats the bolt circle diameter and size?

Full size rule of thumb is count 6 or 8 blades rotation by hand before using the starter. (3 or 4 blade prop). This basically means you rotate it twice by hand, but 4-6 times would be better. If you ever had the pleasure of hand propping a real radial over you can feel the bottom cylinders when...

Very interesting, thank you for sharing that.

http://e85vehicles.com/e85-stations.html It aint worth nothing in cars, but for models it is fine :)

Its just not a round engine if it doesnt leak oil, its part of the charm. :) As to fuel, E85 has been the easiest to get here. 15% gasoline 85% methanol. No oil to worry about like model engine fuel.

Patience young padwan. ;D There are several designs out there already. Most appear to be CDI type with a microcontroller running the show. Eventually, I will have a design good enough to release here. As several recent other threads have pointed out, its really impossible to have the "perfect"...

Smoke is a good thing, it means it is running. :) Sticking an oil ring in is more then just tricky, you have to have a place for all the scraped oil to go. Smoke may get better with some runtime, or it may not. I personally would not worry about re-engineering the pistons at this point, I would...

That kind of specialized equipment wont likely be easy to come by. I just inductively couple into the primary for the most part. Couple turns of wire wrapped around the primary lead. Will work the same for the secondary once I get that far. I can only dream of a scope with storage capability:( I...

I just shove it around by hand in one of those plastic home depot cement mixing tubs. Just adding some rubbing alcohol got its "sticky" back, and my sand is going on 16 years old.

Is that the newer design diffuser or the older one?

That size doesnt match any taper reamers I could find on this side of the pond. :confused: Things may be different over there, but all the chucking reamers I have bought have no taper aside from the first .020 or so. If you cant pass the whole length of the reamer through the part, you have to...

I wasn't questioning your fix, just trying to expand my knowledge of weld failure mechanics. ;)

I didn't have time to jump in on the mailing list when this subject came up, but I have a few moments now to comment. There are a lot of factors that go into a compression test that makes the values obtained less then useful for determining compression ratio. Leakage is probably the biggest...

Was it leaking from a depression in the weld puddle where the weld ended, or was it an overlap/penetration issue somewhere along the weld? Glad to hear you got past that major step.

I am not so sure it can. Resistance is only one measure of a coil. In your case, what is probably different then a standard coil is its reluctance, "L" measured in henries.

I built a 2 cylinder boxer that used Edwards head bolt pattern. If I had to do it over again I would increase that base circle to give some more room between the bolts and cylinder for head gasket sealing surface. I did not make any attempt to fin the cylinders according to his plans. I left a...

Thats certainly possible, as it is with almost every tool we use in this hobby. You have to have respect for your tools, and expect them to try and cut off appendages at every opportunity.