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Post by tony on Dec 10, 2007 22:59:49 GMT
and asda may be shut anyway... ;D
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Post by Juan on Dec 12, 2007 19:57:14 GMT
Just dug out a crank Tony,what measurement do you need?
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Post by tony on Dec 12, 2007 23:50:42 GMT
Its the diameter Juan. But if you only have a tape measure then you might be able to measure the circumference of the larger web ignoring the cut away and with the use of pi..hey presto.But if you dont get a chance then no worries as I'm going to work-shop tomorrow tho so i'll have a look inside stillthewilt's cases i bought and have a measure.
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Post by Juan on Dec 13, 2007 19:02:27 GMT
I can't measure it accurately but it's roughly 87mm.I might buy a vernier tomorrow i I can get to the hardware shop in time,should really have one anyway.
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Post by breezer on Dec 13, 2007 19:09:33 GMT
You've NOT got a vernier gauge?
How old are you? You're letting yourself down there. ;D
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Post by pj on Dec 13, 2007 19:56:20 GMT
so on the subject..does anyone know of a 54mm crank but rotary? Or do mazzucelli do a full circle 54 i can convert? im not completely sure of this, but with my 54mm stroke fabrizi crank i had to grind out the inside of the cases to give enough clearance for the bigend. maybe there are some cranks that are more compact, but i don think it would leave enough room for having a disk valve as well. paul
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Post by xxxss90 on Dec 13, 2007 22:13:08 GMT
???hi pj ,what crankcase are you using?what main bearings ?what other crankcase maching is required? would really appreciate any further info on your engine spec & results... cheers joey merry festivatives.... so on the subject..does anyone know of a 54mm crank but rotary? Or do mazzucelli do a full circle 54 i can convert? im not completely sure of this, but with my 54mm stroke fabrizi crank i had to grind out the inside of the cases to give enough clearance for the bigend. maybe there are some cranks that are more compact, but i don think it would leave enough room for having a disk valve as well. paul
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Post by tony on Dec 14, 2007 0:59:56 GMT
i'm not going to disc valve it paul but rotary as per norm. I'll convert one of the full circles to rotary. My fabrizi is 61 over 51.. its too square but was built for grp 4..so no welding or machining. As it looks like i cant run it in this class i'll make it less square but i'm not gonna spend big bucks on it welding up for a reed.
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Post by tony on Dec 14, 2007 1:21:49 GMT
I can't measure it accurately but it's roughly 87mm.I might buy a vernier tomorrow i I can get to the hardware shop in time,should really have one anyway. thanks juan. Didnt get to meaure it today but i'm looking forward now to see how accurate the Asda method is! cheers.
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Post by pj on Dec 14, 2007 2:00:14 GMT
???hi pj ,what crankcase are you using?what main bearings ?what other crankcase maching is required? would really appreciate any further info on your engine spec & results... cheers joey merry festivatives.... im not completely sure of this, but with my 54mm stroke fabrizi crank i had to grind out the inside of the cases to give enough clearance for the bigend. maybe there are some cranks that are more compact, but i don think it would leave enough room for having a disk valve as well. paul the diameter of the inside of the case, the bit that the fat end of the 54mm cranks bigend , needs to be opened up. fabrizi specs say to 90mm (if i remember), but i found it still rubbed in two places- so i just locally relieved the tight bits with a die grinder. i know nothingf about the other brands of 54mm stroke cranks, and if require the cases to be machined, but i wouldnt be surprised. there isnt much room in there. the tidy way to do it is to take the cases to a machine shop and get them to bore them bigger, but you could use a die grinder- not as tidy. its worth finding out before you buy the 54 crank, its still a bit of work. paul
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Post by Juan on Dec 14, 2007 20:23:14 GMT
thanks juan. Didnt get to meaure it today but i'm looking forward now to see how accurate the Asda method is! cheers. I spent a whole £1.99 on it and I'm buggered if I can work out the circumference with this. ;D
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