rs_sleeper
04-18-2007, 07:39 PM
my crank got turned down 30 thousandths and im just curious as to what people on here would think about running it. be warned, this subject has caused major controversy and death by crankwalk and slung rods has happened because of this subject so beware!
here is one opinion:
from the factory, dsm cranks are given a nitrate coating that gives it strength. however the coating only goes down about 20 thousandths. if you sling a rod bearing or score the journals in any way on a crank you have to get turned or micro polished, however bad the crank may be. some enthusiasts believe that if you turn it AT ALL it will take away the nitrate coating and severely weaken the crank. on top of that you will do nothing but sling rod bearings left and right and possibly cause further damage to a perfectly good block, rod, piston, or even valves.
heres opinion numero dos:
a crank is a crank is a crank. if you turn it the diameter gets smaller so you have to fill that space you just added. so if your crank gets turned 10 under, throw some .10 under bearings in it to fill the gap. 20 for 20 and so on. just as long as the journals are not out of round then you would be fine...
so im stuck with this delimma and would like some more opinions on this subject. here's a few links to different threads that argue both ways on cranks... thanks and happy reading:goodjob:
http://dsmtuners.com/forums/showthread.php?t=254150&highlight=crank
http://www.panhandlegearheads.com/forum/showthread.php?t=7368
http://www.dsmtalk.com/forums/showthread.php?t=108293&highlight=machining+cranks
here is one opinion:
from the factory, dsm cranks are given a nitrate coating that gives it strength. however the coating only goes down about 20 thousandths. if you sling a rod bearing or score the journals in any way on a crank you have to get turned or micro polished, however bad the crank may be. some enthusiasts believe that if you turn it AT ALL it will take away the nitrate coating and severely weaken the crank. on top of that you will do nothing but sling rod bearings left and right and possibly cause further damage to a perfectly good block, rod, piston, or even valves.
heres opinion numero dos:
a crank is a crank is a crank. if you turn it the diameter gets smaller so you have to fill that space you just added. so if your crank gets turned 10 under, throw some .10 under bearings in it to fill the gap. 20 for 20 and so on. just as long as the journals are not out of round then you would be fine...
so im stuck with this delimma and would like some more opinions on this subject. here's a few links to different threads that argue both ways on cranks... thanks and happy reading:goodjob:
http://dsmtuners.com/forums/showthread.php?t=254150&highlight=crank
http://www.panhandlegearheads.com/forum/showthread.php?t=7368
http://www.dsmtalk.com/forums/showthread.php?t=108293&highlight=machining+cranks