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Old 06-20-2006, 06:36 PM
Maxwedge Maxwedge is offline
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Default Engine blueprinting

I have recently read where crankshaft thrust slop typically costs 15% of the total power loss in a motor....I have never heard of anyone adressing this issue. What can you do to lessen this loss?
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Old 06-25-2006, 10:25 AM
OHD OHD is offline
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Tighten up the thrust measurement, to the propper amount, for either an auto or man trans car.

Hard chroming the area and cutting in the proper thrust is the way I do it.
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Old 06-25-2006, 04:31 PM
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15%?

I can't believe that figure... not when there are all those piston rings dragging up the cylinder walls, those cam followers either rubbing on the cam or turning in their holes, seals, rockers trying to bind up, surely this can't be right?
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Old 06-25-2006, 04:31 PM
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Quote:
Originally Posted by Maxwedge
I have recently read where crankshaft thrust slop typically costs 15% of the total power loss in a motor....I have never heard of anyone adressing this issue. What can you do to lessen this loss?
How could it? Interesting...
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Old 06-25-2006, 07:36 PM
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Asked this question on a racing forum... one guy sez total frictional losses are about 7%. Of the total losses, pistons and rings account for 20% to 40%.
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Old 06-27-2006, 05:42 PM
Maxwedge Maxwedge is offline
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That number given to me was by and engineer at Harley Davidson, who would know. What I dont know is if that number is specific to harley's air cooled motors( which could be true, air cooled motors tend to have more "slop" built in to compensate for the more extream heat ranges that those motors experience). Or if he meant it to be with regards to all motors...
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Old 06-27-2006, 08:15 PM
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You could be right there... also there's not a lot of pistons, whereas every engine that I've ever seen has only one set of thrust bearings...
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