<VV> Engine building - bearing clearance

Fri Jan 22 13:42:14 EST 2010

Just to clarify Line boring and Line honing are 2 procedures done on different machines to accomplish the same goal of aligning the bearing bores. 
One machine uses cutters while the other uses stones 

The more accurate  term is Align boring or honing for this. 

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-----Original Message-----
From: "Ron" <ronh at owt.com>
Date: Thu, 21 Jan 2010 22:04:16 
To: <turbovair at earthlink.net>; <virtualvairs at corvair.org>
Subject: Re: <VV> Engine building - bearing clearance

I've never heard of line honing a Corvair block.  Has anyone eve done it and 
if so, what did they use for bearings?
RonH

----- Original Message ----- 
From: "ray smith" <turbovair at earthlink.net>
To: <corvairduval at cox.net>; <virtualvairs at corvair.org>
Sent: Thursday, January 21, 2010 5:35 PM
Subject: Re: <VV> Engine building - bearing clearance

> If the crank is exerting any force to the bearing other then gravity - you 
> are down to zero bearing clearance.
> Snap gauges are for ballpark checks. You need an inside mic for this job.
> from my experience if your end bearing clearances are within spec on a 
> block , and all the crankpins check out , but the inner bearing clearances 
> are tight , your block needs to be line honed.
> Ray Smith
> Sent via BlackBerry by AT&T
>
> -----Original Message-----
> From: "corvairduval at cox.net" <corvairduval at cox.net>
> Date: Thu, 21 Jan 2010 16:54:33
> To: <virtualvairs at corvair.org>
> Subject: Re: <VV> Engine building - bearing clearance
>
> I'm also agree that .001 shells add .0005 per shell, .001 total undersize.
>
> I think the reading error is because the crank was not in the bearing
> shells when you torqued down the block, hence why plastigage works. The
> presence of the crank will affect the crush of the shells.
>
> Awaiting with flame suit on. ggg
>
> Frank DuVal
>
> Original Message:
> -----------------
> From:  corvair at mts.net
> Date: Thu, 21 Jan 2010 14:55:36 -0600
> To: hyarnell1 at earthlink.net, bobhelt at aol.com, virtualvairs at corvair.org
> Subject: Re: <VV> Engine building - bearing clearance
>
>
> I am measuring the inside of the bearing bore in a torqued block, using
> snap gauges and a micrometer.
>
> I measure the crank, the journal is (for example, and from memory) 
> 2.0985".
> I measure the corresponding bore with snap gauge (.001 shells installed),
> then mike the gauge, and get 2.0991".
>
> So my clearance is .0006 - too small.
>
> I want .0010 more clearance, so I substitute 2 STD shells instead of .001
> shells.
>
> Remeasure, and now the bore measures 2.1011 and clearance is .0026" 
> (pretty
> big).
>
> That's what makes me think that a single .001 shell takes away .001
> clearance and a pair of them takes away .002.
>
> It's confusing me. Assembling with plastigauge will assuage my concerns.
>
> Les
>
>>
>> From: "Harry Yarnell" <hyarnell1 at earthlink.net>
>> Date: 2010/01/21 Thu PM 02:37:08 CST
>> To: <corvair at mts.net>,
>> <bobhelt at aol.com>,
>> <virtualvairs at corvair.org>
>> Subject: Re: Re: <VV> Engine building - bearing clearance
>>
>> What  are you measuring with? Plasticgage is the only way I know of.
>> Measuring with mechanical calipers gets you close for the crank. Forget
>> about measuring the bearings with calipers...
>>
>>
>> Harry Yarnell
>> Perryman Garage and Orphanage
>> hyarnell1 at earthlink.net
>> ----- Original Message ----- 
>> From: <corvair at mts.net>
>> To: "Harry Yarnell" <hyarnell1 at earthlink.net>; <bobhelt at aol.com>;
>> <virtualvairs at corvair.org>
>> Sent: Thursday, January 21, 2010 3:08 PM
>> Subject: Re: Re: <VV> Engine building - bearing clearance
>>
>>
>> > That's what I thought too, and it's why I'm scratching my head. It's
> hard
>> > to measure the thickness of the bearing to know for sure.
>> >
>> > I swap ONE shell, and my clearances are good - added .001 by swapping
> one
>> > shell.
>> >
>> > I will plastigauge as a last step but this is confusing me.
>> >
>> > Les
>> >>
>> >> From: "Harry Yarnell" <hyarnell1 at earthlink.net>
>> >> Date: 2010/01/21 Thu PM 01:56:59 CST
>> >> To: <corvair at mts.net>,
>> >> <bobhelt at aol.com>,
>> >> <virtualvairs at corvair.org>
>> >> Subject: Re: <VV> Engine building - bearing clearance
>> >>
>> >> I thought that a .001 undersize bearing was the TOTAL, not .001 for
> each
>> >> shell .
>> >>
>> >> Harry Yarnell
>> >> Perryman Garage and Orphanage
>> >> hyarnell1 at earthlink.net
>> >> ----- Original Message ----- >
>> >> > Am I correct that a .001 US bearing is supposed to take away .001
>> >> > clearance for EACH bearing shell (.002 total if you use one on each
>> >> > side)?
>> >> > That's what my measuring looks like.
>> >> >
>> >> > I have a nice .0010-.0016 across all four bearings now, all .001
> except
>> >> > for 1 side STD in #2 and 1 side STD in #4.
>> >> >
>> >>
>> >>
>> >
>> >
>>
>>
>
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