Crank Measuring part 2
#207236
01/28/09 10:08 PM
01/28/09 10:08 PM
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Joined: Mar 2007
Posts: 12,008 Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
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So I asked about plastiguage earlier, wasnt really happy with my measurments as far a s accurate. So, i used a mic, my crank measures at 2.125 pretty much on the dot. K1 stuff is nice, I dont have an inside mic so I measured them with my digital dial calipers whick I tested with my mic, and its spot on, I had it calibrated erlier this year at a machining shop in town. The rods measure 2.250 without a bearing in it, and each bearing half measures .062. If I add the .062 together it makes .124, that added to my inside measurement of 2.250 makes 2.374, now take that measurement minus the 2.125 i end up with .249. Is this more accurate than plastiguage because I hit .25 almost on the nut. Its a lot of math, and a bit of hassle, but without a dial bore gage its all I have for now. Would you guys consider this an accurate enough measurement, and run it or should I buy a dial bore gage? or is my math totally messed up? I am not known for my math skills so Im just asking it this will work, dont rake me over the coals if Im wrong. Kasey
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Re: Crank Measuring part 2
[Re: Moparnut426]
#207239
01/28/09 10:21 PM
01/28/09 10:21 PM
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Joined: Jan 2003
Posts: 1,633 Jacksonville, NC
RonP
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,633
Jacksonville, NC
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Quote:
So I asked about plastiguage earlier, wasnt really happy with my measurments as far a s accurate. So, i used a mic, my crank measures at 2.125 pretty much on the dot. K1 stuff is nice, I dont have an inside mic so I measured them with my digital dial calipers whick I tested with my mic, and its spot on, I had it calibrated erlier this year at a machining shop in town. The rods measure 2.250 without a bearing in it, and each bearing half measures .062. If I add the .062 together it makes .124, that added to my inside measurement of 2.250 makes 2.374, now take that measurement minus the 2.125 i end up with .249. Is this more accurate than plastiguage because I hit .25 almost on the nut. Its a lot of math, and a bit of hassle, but without a dial bore gage its all I have for now. Would you guys consider this an accurate enough measurement, and run it or should I buy a dial bore gage?
or is my math totally messed up? I am not known for my math skills so Im just asking it this will work, dont rake me over the coals if Im wrong.
Kasey
Your math is wrong
Crank 2.125 Rod big end 2.250 bearings .062 + .062=.124 SHould be Rod 2.250 - .124 = 2.126 Rod 2.126(with bearings in) - Crank 2.125 = .001 clearance
Last edited by RonP; 01/28/09 10:22 PM.
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Re: Crank Measuring part 2
[Re: Moparnut426]
#207242
01/28/09 10:25 PM
01/28/09 10:25 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Put the bearings in and torque them down and TRY to get a reading with your calipers(should use a bore gauge)subtract the crank numbers from the bearing ID. Or take the block, crank and your rods to your local machine shop and have them measure it(which this would be better)
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Re: Crank Measuring part 2
[Re: MR_P_BODY]
#207244
01/28/09 10:35 PM
01/28/09 10:35 PM
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Joined: Mar 2007
Posts: 12,008 Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
|
Quote:
Put the bearings in and torque them down and TRY to get a reading with your calipers(should use a bore gauge)subtract the crank numbers from the bearing ID. Or take the block, crank and your rods to your local machine shop and have them measure it(which this would be better)
Also I didnt want to put the bearings in the rods because my caliper is pretty sharp and I didnt want to knick up the bearings. I have a bore gage coming from Ebay.
Thanks guys!!
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