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Old 11-01-2008, 12:57 PM
GMR GMR is offline
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measure crankshaft stroke

I measured my crank stroke - I think. Here's what I did - used an extension on dial indicator to set piston at BDC then used 6" dial caliper to measure piston to top of deck, then factored in piston deck height which I had previously measured. This is a sbc Scat cast steel 3.75 crank. My results showed a stroke of 3.760 for all throws except rear (cyl 7,8) which was 3.753.

Was my method acceptable and do my results make sense?

Is there a more accurate way of doing it without spending a couple hundred dollars on a special tool?

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Old 11-01-2008, 01:46 PM
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The way you did it is the way I do it and it works for me.
After measuring, I bring the piston to TDC and check how far down in the hole it is and subtract the difference from the total.
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Old 11-01-2008, 08:23 PM
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Your pistons might be rocking at either the top or bottom of the rotation, causing your measurements to be skewed a little as they are showing. If you could check the piston in the very center of the bore, where piston rock would be negligable, you will see a stroke more consistant with what it actually is.
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Old 11-02-2008, 11:22 AM
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ok, thanks
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