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Can you measure bore with telescoping gauges & calipers #1277178 07/31/12 05:25 PM 07/31/12 05:25 PM
Joined: May 2008 Posts: 958 eastern, pa. C cudabitten OP super stock
cudabitten OP super stock C Joined: May 2008 Posts: 958 eastern, pa.	I picked up some telescoping gauges and a digital caliper that measures to .001. I spent only about 20 minutes and got consistent readings with these tools. I understand there is a process to measure for taper and out of round. I didn't want to waste a whole bunch of time if this method is not reliable. For example, I'm checking the bore on a 318, the spec says 3.910 to 3.912 is the standard bore. I got 3.9060 consistently in three of the cylinders. That gives me .004, the maximum tolerance is over .005 before requiring reconditioning. Anyone use these tools for this?

Re: Can you measure bore with telescoping gauges & calipers [Re: cudabitten] #1277179 07/31/12 07:36 PM 07/31/12 07:36 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	If you are measuring at 3.906 you are measuring smaller than the standard 3.91-3.92 not .004 wear. 3.91 is bigger than 3.906 unless new math changed things

Re: Can you measure bore with telescoping gauges & calipers [Re: MoparforLife] #1277180 07/31/12 10:57 PM 07/31/12 10:57 PM
Joined: Nov 2008 Posts: 671 Wisconsin USA B Bill MeLater mopar
Bill MeLater mopar B Joined: Nov 2008 Posts: 671 Wisconsin USA	Not gonna give you what you really need to know, find someone with a bore guage. And don't get to hung up on the .005 thing, looser still works, just makes a little more noise....

Re: Can you measure bore with telescoping gauges & calipers [Re: cudabitten] #1277181 07/31/12 11:41 PM 07/31/12 11:41 PM
Joined: Aug 2003 Posts: 43,227 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,227 Bend,OR USA	If you had a standard to calibrate the digital calipers it might be halfway accurate to use them and the snap gauges, without it your guessing how far the calipers are out from being accurate at any size See if you can borrow or buy a 2,3 and 4 inch outside micrometer checking tool, standard, to work with now And use both the snap gauges and the calipers to measure both the bores and pistons Last edited by Cab_Burge; 08/02/12 04:56 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Can you measure bore with telescoping gauges & calipers [Re: cudabitten] #1277182 08/01/12 01:19 AM 08/01/12 01:19 AM
Joined: Sep 2006 Posts: 150 Illinois F fishy68 member
fishy68 member F Joined: Sep 2006 Posts: 150 Illinois	Moparforlife nailed it. You said you measured 3.906". That's .004" smaller than the minimum. That right there should tell you it's not accurate. The biggest problem is probably the caliper. I have 3 and none read the same. Their all within 2-3 thousandths which is ok for most things but not all. 68 Cuda 408/904/8-3/4 02 Dakota 4.7 auto

Re: Can you measure bore with telescoping gauges & calipers [Re: fishy68] #1277183 08/01/12 04:16 AM 08/01/12 04:16 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I have a full set of telescoping gauges I use. I have digital calipers and outside mikes up to 5 inches. The mikes are dead accurate as I check them and calibrate them all the time. The digital caliper is very accurate as I can also calibrate it. The thing is you need a good touch with telescoping gauges to be very accurate. I like to use them for general readings but use my bore gauge for very accurate readings. Ron Last edited by 383man; 08/01/12 04:17 AM.

Re: Can you measure bore with telescoping gauges & calipers [Re: 383man] #1277184 08/01/12 08:41 AM 08/01/12 08:41 AM
Joined: Jan 2003 Posts: 738 Columbus Ohio M mopfried super stock
mopfried super stock M Joined: Jan 2003 Posts: 738 Columbus Ohio	Quote: I have a full set of telescoping gauges I use. I have digital calipers and outside mikes up to 5 inches. The mikes are dead accurate as I check them and calibrate them all the time. The digital caliper is very accurate as I can also calibrate it. The thing is you need a good touch with telescoping gauges to be very accurate. I like to use them for general readings but use my bore gauge for very accurate readings. Ron I agree 100%.. Mikes and a good feel for the telescope gauge. Dial bore gauges are dead on.

Re: Can you measure bore with telescoping gauges & calipers [Re: cudabitten] #1277185 08/01/12 01:03 PM 08/01/12 01:03 PM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	The snap gauge and calipers could be OK for a rough measurement, but don't have the accuracy required for most inside measurements on an engine where you would want at least 0.0005" resolution or better for measuring main, rod and piston bore clearances. A dial bore gauge is a comparison tool. It is setup using a known standard, usually a calibrated micrometer.

Re: Can you measure bore with telescoping gauges & calipers [Re: 451Mopar] #1277186 08/01/12 07:51 PM 08/01/12 07:51 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Unless your snap gauges have rounded ends you will be measuring slightly under the bore size. Like this: (!---!) I really don't like snap gauges and after using a good bore gauge I am spoiled. R.

Re: Can you measure bore with telescoping gauges & calipers [Re: dogdays] #1277187 08/02/12 12:31 AM 08/02/12 12:31 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: Unless your snap gauges have rounded ends you will be measuring slightly under the bore size. Like this: (!---!) I really don't like snap gauges and after using a good bore gauge I am spoiled. R. Mine do have rounded ends on all of them. Ron

Re: Can you measure bore with telescoping gauges & calipers [Re: 383man] #1277188 08/02/12 09:01 AM 08/02/12 09:01 AM
Joined: May 2005 Posts: 416 Franklin Co. Illinois runinonmt mopar
runinonmt mopar Joined: May 2005 Posts: 416 Franklin Co. Illinois	go to your local parts store that rents tools,get the right size Mic,for the standard if nothing else. Ron In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty

Re: Can you measure bore with telescoping gauges & calipers [Re: runinonmt] #1277189 08/02/12 09:33 AM 08/02/12 09:33 AM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Snap gauges work fine, but it's one of those things that work fine if you have a lots of practice using them. A bore gauge is more user friendly, especially for someone who doesn't do it often enough. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

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