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Re: Micrometer responses

To: "Phil Ethier" <>
Subject: Re: Micrometer responses
From: "Michael Sloane" <>
Date: Mon, 16 Dec 1996 16:35:10 -0500
Absolutely! In fact, if it is cylinder bores you are talking about, bore
shape is even more important than diameter. Internal combustion engines
tend to wear more side-to-side than front-to-back, due to lateral forces
imposed in the normal functioning of the Otto/Diesel cycle. One of the neat
features of the old Triumphs (and many old tractors, to which Triumph owes
some of its heritage) is the fact that you can turn the cylinder liners 90
degrees and get even more life from them. I don't know if anyone bothers to
do that kind of thing anymore, but that is what we used to do with them
back in the '50s and early '60s. Any other kind of gauge except a "T" gauge
will not give you as accurate picture of the shape of the cylinder. Also
remember that you must measure not only the center of the cylinder but the
top and botton.

Mike Sloane (

> From: Phil Ethier <>
> To: Michael Sloane <>
> Cc: John Loftin <>;; Jack I Brooks <jibrooks@JUNO.COM>
> Subject: Re: Micrometer responses
> Date: Monday, December 16, 1996 4:08 PM
> On Monday, 16 Dec 1996, Michael Sloane wrote:
> > I bought a set of bore gauges (the kind that are spring-loaded
> > rods with locks for checking cylinder bores) from Harbour Freight for
> > $25. They seem to work fine for the handful of times/year that I need
> > check cylinder bores.
> T-gauges are neat, and a whole lot more accurate than one might think, 
> but they can be fooled.  They only measure at two points, and you can 
> miss an out-of round condition.
> Phil

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