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[turbohf]

http://www.ebay.com/itm/2-6-Dial-Bore-Gage-Set-0-0005-Grad-Part-714-755-NEW-/161064490169?pt=BI_Heavy_Equipment_Parts&hash=item25803114b9

I'm looking for a tool to measure cylinder bores to check the size. make sure they are round or close enough. taper. etc.

is that what I'm needing? I would like something to do several bore sizes. 75-81-84-87... maybe bigger but those off the top of my head. prefer to be in mm and not inch. but whatever.

[Minor Threat]

Imperial is generally more accurate but that's the tool you're looking for.

[92CXyD]

If Im just doing quick and dirty bore checks I use t-gages and a digital caliper.

If you are looking at runout or taper of bore then that tool would be what you want.

Maybe a better manufacture like Brown and Sharpe or one of high end Japanese made ones.


Waiting for Rawr to chime in or better yet Weir or Passenger since they probably play with these gages a lot. 

[Tim]

I went with one that was 1.4-6 range so I could do rod and main bearings.
Also got a set of micrometers for the crank etc.

I suck at using them and don't trust my measurements haha

[turbohf]

well I'm just looking to rebuild some 20yo engines for some more life. or just check them to make sure they are good for another round of use... I have built so many without even checking, but if I sell some I would prefer to make sure they are just fooked before slapping them together and shipping them out...

[rawr]

What you posted is what you need to check roudness and taper but it won't measure a nominal size so youre going to have to pick a point to delta your measurement (think tare on a scale) and be consistent with where you delta'd your measurement since that is your reference point. These bore gages are finicky and measuring cylinders, while it isn't hard it takes some technique. Just make sure that while using it you move it around side to side to find your smallest point to make sure the gage is perpendicular to the cylinder then try to find your largest point while kind of rotating it with your fingers for the best results. If the indicator on top sucks replace it with a better one. That's all that get calibrated on these kits since they're always referenced in use.

if those are used to check a nominal size you'll need gage blocks to set your reference on (buy a old used set of square blocks with some larger parallels and accessories like rods and screws) or if youre going to be working with the same bore or within a few thou or whatever you can buy a ring gage for your nominal but buying multiple sizes of ring gages will get expensive really quick. You can even use a micrometer but if you do youre limiting your accuracy by about .001 or .0001 right off the start depending on the mic used.

[HiProfile]

My guess is Dustin just wants to check if the bore is w/in spec for roundness & taper. Zero the gauge on the side of the bore them see how much the front/rear measurement. Top-notch blueprinting & honing may require exact dimensions, but rebuilding only needs clearances to be found.

[rawr]

I am aware but explaned how to get nominals anyway

[DSharp]

I bought a harbor freight 1.4-6 digital bore gauge back in 09 for building engines.  I was very surprised at how consistent it was and the precision it would measure.  I don't usually like cheap measuring tools, but this one is an exception.  They don't sell them anymore though.
looks just like this.