Hear this , now hear this. Yes, Bill.
----- Original Message -----
From: "Bill Babcock" <Billb@bnj.com>
To: "Glenn Franco" <gaf3@charter.net>
Cc: <fot@autox.team.net>
Sent: Thursday, January 31, 2008 3:21 PM
Subject: Re: [Fot] checking bearing clearances
> I've always found plastigage to be more accurate than telescoping
> gauges. You get two error sources with telescoping gauges--one when
> you tweak them through the bore against the friction stopper and the
> spring (picture a little boing as the radius of the gauge slips past
> perpendicular), and the second when you read them. I only use them for
> approximate readings--I don't think you can get them to read within a
> consistent thou of an inside mike, though they are very handy for
> quick and dirty. I've had my set for forty years. YIKES!!
>
> I wouldn't bother to buy an inside mike unless I was building more
> than a few engines a year. Measurements take practice to make
> accurately, that's what good machinist are for. Plastigage is how you
> check that nobody screwed up and you didn't swap bearing shells.
>
> On Jan 31, 2008, at 2:28 PM, Glenn Franco wrote:
>
>> Mark J Bradakis wrote:
>>> I use plastigage, since I don't have a decent inside micrometer.
>>> Maybe it would be worth it to get one that would cover the
>>> appropriate size for TR6 and Spit big ends and mains.
>>>
>>> mjb.
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>> Mark
>> Pick up a set of telescope gauges at your local tool supply or even at
>> harbor freight.
>> They expand and take up the dimension of the cylinder and you use an
>> outside micrometer to take your measurement.
>> They also sell small hole gauges (same principle) for measuring things
>> like valve guide dimensions (id).
>> I have been using them for years.
>> But I always check with platigauge before assembly.
>> Glenn Franco
>> 72 Spit racer under construction & too many TR's
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>
> Bill Babcock
> Babcock & Jenkins
> Billb@bnj.com
> 503.936.7660
> www.bnj.com
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