Forum whore
Sorry Dave if this isnt up to your minimim standard of intetest but others may be intetested, no more rockets.
A 125cc air cooled cylinder, for Bucket Vinduro, rules state air cooled. Here CNCed up a wee die to pour resin fins for a pattern. It will bolt to my universal rotary disc valve bottom end, the one being used for the 175cc uniflow at the moment. 52 bore, 58 stroke, eye ports, 5mm exhaust dam, 34mm carburetor, petrol. Single rotary disc sliding gib. Cast in LM13, Nikasil bore.
Forum whore
I might have to create some artificial gravity to fill the die properly. Micro drive to control that gravity.
No8 Wire Extraordinaire
Well I've just been watching Shaun the Sheep with the kids, so kinda on track for rocket Aardmen stuff.
This should be a hoot. How will you keep the aircooled fins attached? Complicated.
Don't you look at my accountant.
He's the only one I've got.
Forum whore
Left one just gravity, air got trapped in the extremities and didnt fill the die properly.
Right one spin cast, clearly much more satisfactory.
Anorak
how fast was it spinning.Originally Posted by Flettner
Kinky is using a feather. Perverted is using the whole chicken
Forum whore
Estimating 500 ish revs.
Muddler/Dabbler.
This looks very interesting - same bore/stroke as the good old BSA Bantam etc! - the new bucket standard?
Strokers Galore!
Forum whore
No more casting resin until after Christmas, bugger.
Hardcore Biker
Nothing like a bit of spin.
Kart disc brake rotors we make. 200 in dia * 12 thick. Weigh around 420 gm compared to 1200 for a CI equivalent. Same material as our pistons. Ductile iron dies.
Top left is without spin, right is with 180 rpm spin, partially machined and lower middle finished.
"Success is the ability to go from one failure to another with no loss of enthusiasm.”
Anorak
So what are they coated with Ken. or is the Si content and kart drivers wallet enough?Nothing like a bit of spin.
Kart disc brake rotors we make. 200 in dia * 12 thick. Weigh around 420 gm compared to 1200 for a CI equivalent. Same material as our pistons. Ductile iron dies.
Top left is without spin, right is with 180 rpm spin, partially machined and lower middle finished.
I know that plenty of GP bikes in the early 80 used zanzani (not sure spelling)rotors as did MV before then.
I think they were plasma coated with always Fe it always sounded to me like dude with spraying a gun like the one used to build up a crank.
Kinky is using a feather. Perverted is using the whole chicken
Forum whore
Wheels won an Ohakea GP using an aluminum disc, plasma sprayed. Oh.... and centre hub steering. Kawasaki 100 with 19HP I believe, no mean feat.
No8 Wire Extraordinaire
Was it plasma sprayed? I've seen a few done with the right ally and organic pads.
Don't you look at my accountant.
He's the only one I've got.
Hardcore Biker
Whosarr, not coated. As it happened we were casting these today, so attached are some pics. Some say the beer barrel is appropriate.
The 4 bobweights provide a centrifugal clamping force, important to not have hot metal spinning/leaking out at waist height. The level of escape is also withing the barrel.
"Success is the ability to go from one failure to another with no loss of enthusiasm.”
Forum whore
Nice setup.Whosarr, not coated. As it happened we were casting these today, so attached are some pics. Some say the beer barrel is appropriate.
The 4 bobweights provide a centrifugal clamping force, important to not have hot metal spinning/leaking out at waist height. The level of escape is also withing the barrel.
Forum whore
Makes the supercharger look small.
Sitting on the doorstep this evening.
Lots of work to trim this down to a less sizable lump. I should weigh it as is, before and after as it were.
It was almost free thankfully.
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