So I've got three crankshafts,
#1: 0.003" TIR, decent bearing journals
#2: 0.0005" TIR, and fairly worn journals, not horrible but you can feel the grooves with your fingernail.
#3: 0.0025" TIR, and perfect mirror bearing journals.
Now the question is, which one to use...
The crankshafts are all forged, this is for a turbo motor that will see some pretty high Hp/torque. I've looked around and it seems like straightening a crankshaft isn't unheard of but I'm not sure if it would have any effect on the longevity. I have a hydrolic press that I could put a load on the one with 0.0025" TIR and get the bend out if it, but I'm worried it will come back once its in and running in the engine. Our bearings only have ~0.002" clearance, so it would be rubbing if nothing is done. On the other hand, I can push down on the crankshaft and get it to spring 0.001" fairly easily, so maybe there wouldn't be much of an increased load on the bearings with it having 0.0025" TIR. I'm having a hard time finding a good crankshaft and don't want to spend anymore money gambling on if it's straight or not. Does anyone have any experience or do most people not even bother checking? Let me know what you think, thanks.
#1: 0.003" TIR, decent bearing journals
#2: 0.0005" TIR, and fairly worn journals, not horrible but you can feel the grooves with your fingernail.
#3: 0.0025" TIR, and perfect mirror bearing journals.
Now the question is, which one to use...
The crankshafts are all forged, this is for a turbo motor that will see some pretty high Hp/torque. I've looked around and it seems like straightening a crankshaft isn't unheard of but I'm not sure if it would have any effect on the longevity. I have a hydrolic press that I could put a load on the one with 0.0025" TIR and get the bend out if it, but I'm worried it will come back once its in and running in the engine. Our bearings only have ~0.002" clearance, so it would be rubbing if nothing is done. On the other hand, I can push down on the crankshaft and get it to spring 0.001" fairly easily, so maybe there wouldn't be much of an increased load on the bearings with it having 0.0025" TIR. I'm having a hard time finding a good crankshaft and don't want to spend anymore money gambling on if it's straight or not. Does anyone have any experience or do most people not even bother checking? Let me know what you think, thanks.
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