Crank TIR
Crank TIR
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Joined: Jul 2008
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Watch Guy
Run out is when the Crank shaft is held on bearing areas and it is rotated with an indicator on the outer most point (by the cam gear)in one rev. the total amount of .000 it is not straight. Hope that helps ?
Run out is when the Crank shaft is held on bearing areas and it is rotated with an indicator on the outer most point (by the cam gear)in one rev. the total amount of .000 it is not straight. Hope that helps ?
Stellar HDF Member
Joined: Dec 2009
Posts: 2,035
Likes: 8
From: Western Canada
Thanks but doesn't help at all
might as well be speaking in Greek.
Road Warrior
Joined: Sep 2010
Posts: 1,260
Likes: 44
From: Back woods of Maine
If the crank is bent, the center of the shaft does not rotate in a fixed location. Rather, as it rotates, it moves in an arc around a center point. If the center of your shaft had a pencil mounted perfectly to it, and the shaft was not bent it would leave a pencil point on a piece of paper, if the shaft was bent, as it rotated, the pencil would draw a circle on that paper. The numbers that we are using here are very small and the average guy can't see .009 very well. Because of this, we use a measuring device called a dial indicator. So, the term that you hear is TIR, Total Indicator Runout , the amount that your crankshaft is bent. .009 doesn't sound like much until you realize that at 4000 rpm your crank is turning a revolution 4000 times every minute, so multiply .009 times 4000 to see total movement of your shaft. It's alot.
Stellar HDF Member
Joined: Dec 2009
Posts: 2,035
Likes: 8
From: Western Canada
Ok, I get it now
If the crank is bent, the center of the shaft does not rotate in a fixed location. Rather, as it rotates, it moves in an arc around a center point. If the center of your shaft had a pencil mounted perfectly to it, and the shaft was not bent it would leave a pencil point on a piece of paper, if the shaft was bent, as it rotated, the pencil would draw a circle on that paper. The numbers that we are using here are very small and the average guy can't see .009 very well. Because of this, we use a measuring device called a dial indicator. So, the term that you hear is TIR, Total Indicator Runout , the amount that your crankshaft is bent. .009 doesn't sound like much until you realize that at 4000 rpm your crank is turning a revolution 4000 times every minute, so multiply .009 times 4000 to see total movement of your shaft. It's alot.
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jacknthebox
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Dec 29, 2010 11:21 PM
