<VV> Engine building - bearing clearance

[Ron]

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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