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- Jul 8, 2009
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+1 on the surreal comment.
With all engine parts now finished except for the piston rings, it would make sense to start on them next. Piston rings are really boring, and with so many ahead of me it's hard to get moving in that direction. After lots of procrastination, work is continuing instead
That is awesome!A primarily cosmetic shroud was designed for the radiator and machined from black Delrin. It's mounted to a pair of side rails attached to the sides of the radiator core. Machining Delrin is a hoot and an opportunity to run with the big boys with speeds and feeds at near full tilt. Both faces of the shroud's workpiece received a lot of machining.
The shroud will be mounted to the radiator through four spacers that will allow the fan to draw air across the rear face of the radiator. The spacers will also provide for the removal of the shroud with the radiator in place in front of the engine.
The core's thin wall was a problem for the fasteners that attached the aluminum side rails. The fasteners penetrate the walls of the core but provide only three or so threads for a Loctite seal. Loctite 620 was added to the primer'd surfaces under the rails for additional sealing and the elimination of air spaces that would create bubbling problems when the assembly's paint is heat cured. - Terry
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TerryThat is awesome!
It's called Gun Kote. After a 300F cure it's tough and pretty impervious to engine fluids and many solvents. - TerryTerry
What brand of heat cured paint are you using?
Awesome build, thank you for sharing.
LOL, a person gotta do what a person gotta do.These were done in a secret late night kitchen operation.
Time to come up with the design was about 20 hours. Total machining time was about 6 hours. - TerryYour work is amazing and inspiring
What would the cycle time be for machining the ignition cover
The ignition module is designed around one of Roy Sholl's CDI's. Roy sold both regular and 'magnum' versions of his CDI's with the higher sparks/sec magnums intended for multi-cylinder engines. I believe the differences between the two were that the magnums which were intended to be driven at a full six volts and had smaller storage capacitors and beefier drivers for faster charging rates.
It's one of Roy's magnums. I'll be using a voltage regulator module to drop the 12 volt battery voltage down to exactly 6V. Not sure how the lifetime of Roy's CDI's are affected by voltages higher than 6V, but he was always adamant about not going any higher. - TerrySo presumably you selected the magnum model? Is it from prior inventory you sourced from the new supplier/builder? Any thoughts on how tolerant the nominal 6v input voltage would be to say... a 2S lithium battery ~7.4v. I'm sure it would handle the current requirements, but that's a moot point if the whole system revolves around 6v +/- some narrow deviation.
https://www.cncengines.com/
Can you elaborate - what are the dimensions of current draw in this formula?Voltage X RPM's = total current draw.
And are these reference RPMs on a single cylinder basis, so a 5 cylinder would be 30K/5=6K max crankshaft RPM for example?The Magnum will operate up to about 20K on 5 volts, for more speed it needs the 6 volts to get to 30K RPM's
Peter,Can you elaborate - what are the dimensions of current draw in this formula?
And are these reference RPMs on a single cylinder basis, so a 5 cylinder would be 30K/5=6K max crankshaft RPM for example?
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