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| show me your busted cranks https://www.ausmini.com/forums/viewtopic.php?f=2&t=68224 |
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| Author: | david rosenthal [ Fri Jan 14, 2011 8:59 am ] |
| Post subject: | show me your busted cranks |
After reading MINTI's thread on his busted crank I thought it might be interesting to do a comparison on various busted cranks. I am aware that the big journal cranks have a habit of breaking but what I am interested in is a bit of info on the following items and then I can start to put this info with some torsional vibration calcs and see what stress loads have been applied. ITEMS 1 engine type I.E. 1275 etc 2 journal diameter and crank type IE std/nitrited/ en40b etc. 3 stroke of crank IE std or stroker and bore diameter and comp ratio 4 was the crank/attachments balanced 5 what was being done to the eng at time of breakage.IE changing gears. 6 condition and type of balancer fitted 7 revs used and rpm at breakage 8 is the engine N/A or forced induction. if forced what boost. Now this item is very important to the calcs. It is the peak pressure of the cylinders, that is the maximum firing pressure, which I can calculate if you have a compression test pressure of the engine and the degree of the inlet valve closing. |
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