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I have a follow-up question: Does it make any difference (in the discussion about the defect frequencies) with spark engines compared to diesel type?

Thanks very much guys, Very helpful answer Greg and thanks Cat for that. If I didn't have it already, that would be very helpful. That is actually the document I was referring to in the second part.

I read a piece on aircraft engine vibrations that stated a misfiring engine produces high 1 1/2x vibration. Then I read a document from a major recip engine manufacturer (not aircraft) which stated that misfire generates 1/2x vibration. It further stated that 1 1/2x and 2 1/2x vibrations were a...

Hi Strong, Thanks for your reply. A scenario would be this: Large sub-synchronous peak in data taken on the motor (pump shafts & bearings are inaccessible, as you stated). This peak is suspected to be shaft whip due to worn or missing spiders. What is the best way to verify this before...

Thanks Strong, that is very helpful information, but I guess what I am really asking is what is the best way to field test such a pump to determine what the shaft whip frequency is?

What is the best way to determine what frequency you can expect to see excited when a spider bearing wears out on a vertical turbine? Thanks, Texark