Comments on: Further thoughts on Crankshaft Oiling http://www.ret-monitor.com/articles/986/further-thoughts-on-crankshaft-oiling/ Specific mission-critical info for professionals Mon, 21 May 2012 23:11:55 +0000 http://wordpress.org/?v=2.7.1 hourly 1 By: Frank Ardanowski http://www.ret-monitor.com/articles/986/further-thoughts-on-crankshaft-oiling/comment-page-1/#comment-3442 Frank Ardanowski Sat, 29 May 2010 23:06:35 +0000 http://www.ret-monitor.com/articles/986/further-thoughts-on-crankshaft-oiling/#comment-3442 I have a crankshaft question that starts with the connecting rod's two different diameters, the wrist pin and the rod journal. The connecting rod's big end sees apprx the same compressive and tensile loads that the much smaller wrist pin sees, yet it is twice the wrist pin's diameter. Why is that? I thought about that on and off until it hit me that the rod's's journal size has little to do with the rod and is mostly about the crank and torque. The crank has to withstand and transmit the combined torque of each cylinder. If the rod journal's were wristpin size the crank would fail close to immediately. I chose to omit the other forces that the crank has to handle. If anyone would care to reply, agree, disagree or just comment, please do I have a crankshaft question that starts with the connecting rod’s two different diameters, the wrist pin and the rod journal. The connecting rod’s big end sees apprx the same compressive and tensile loads that the much smaller wrist pin sees, yet it is twice the wrist pin’s diameter. Why is that?

I thought about that on and off until it hit me that the rod’s’s journal size has little to do with the rod and is mostly about the crank and torque. The crank has to withstand and transmit the combined torque of each cylinder. If the rod journal’s were wristpin size the crank would fail close to immediately.

I chose to omit the other forces that the crank has to handle. If anyone would care to reply, agree, disagree or just comment, please do

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