<VV> Engine building - bearing clearance

[ray smith]

Les , do you have the original main bearing shells from this block?
I'm just curious whether the factory had to mix some shells to get clearances in spec also. 

Ray Smith


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-----Original Message-----
From: <corvair at mts.net>
Date: Fri, 22 Jan 2010 11:14:58 
To: John Kepler<jekepler at amplex.net>; 'Tony Underwood'<tony.underwood at cox.net>
Cc: <virtualvairs at corvair.org>
Subject: Re: <VV> Engine building - bearing clearance

Oog. that starts to sound nasty expensive... I assume you could shave a thou or so off each half without throwing off the bellhousing/top cover/rear module/oil pan bolts but any more than that and all the holes would be misaligned. The metal spray would be the only way to go in that case.

Les


> 
> From: "John Kepler" <jekepler at amplex.net>
> Date: 2010/01/22 Fri AM 10:19:34 CST
> To: "'Tony Underwood'" <tony.underwood at cox.net>,  <corvair at mts.net>
> CC: <virtualvairs at corvair.org>
> Subject: RE: <VV> Engine building - bearing clearance
> 
> 
> 
> Happens often with inline or V engine blocks all the time, not so 
> much with aluminum boxer crankcases like a 'Vair or other boxer 
> unless the engine is a bit of an exotic (Porsche Ferrari etc) that 
> commands some economic respect.
> 
> I've done it with Porsches and have actively contemplated it with a
> performance Corvair engine....but it requires a bit more than just hogging
> out the journals!  To achieve the increased precision and avoid the
> collateral "nastiness" of misaligning bolt-holes, you have to metal-spray
> the existing journals and then re-machine.  It adds more expense, but end up
> with a better-than-stock bottom-end.  Whether it's worth that additional
> expense is in the eye of the owner...I think it is in a certain context, and
> it is certainly the only real way to resurrect worn cam-journals.  Finding
> shops that do reasonable priced metal-spraying isn't nearly as difficult as
> it used to be, and so is something to consider.  If you're going to do the
> cam-journals, you may as well do the mains and then align-bore them as well.
> 
> John
> 
> 
> 

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