<VV> Engine building - bearing clearance

[Ron]

That's what I've always understood, the factory selectively offset bearings 
to avoid "thumpers".
RonH

----- Original Message ----- 
From: "Chris & Bill Strickland" <lechevrier at earthlink.net>
To: <virtualvairs at corvair.org>
Sent: Friday, January 22, 2010 11:35 AM
Subject: Re: <VV> Engine building - bearing clearance


>
>>You cannot put bearing shells of different thicknesses in the same 
>>journal.
>>That will put side pressure on the crank and wear out the tighter
>>bearing insert and possibly the crank journal itself and failure of the
>>unit.
>>
>
> Agreed, that for us average Corvair folks, plastigauge is the tool of
> choice for *verifying* bearing clearances, after a careful measuring of
> the crank and selction of proper bearings.
>
> But as for the above, wasn't it the factory that introduced mixed
> bearings shells into the Corvair engine building repertoire?  First, the
> single vertically offset bearing on #4 journal, then as more original
> engines were disassembled and found to have mismatched bearing sets,
> after many miles of satisfactory service, didn't it appear that this was
> some sort of standard factory practice?
>
> Bill Strickland
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