<VV> Cam Bearings

[Rad Davis]

The VW crowd solution to a similar problem on the type I-III VW engines is 
to cut a few thousandths off of the mating faces of the case, bolt it 
together, and then line-bore crank and cam bores both.  They have removable 
bearing inserts for both crank and cam, but the cases are so flimsy that 
they frequently pound the webs out of round.

It saves you the welding step at the expense of more boring machine setup time.


At 03:55 PM 2/5/2006 -0700, Dennis & Debbie PLEAU wrote:
>Smitty,
>
>I had a fellow club member who ate two cams with very low miles because 
>his block was very worn.  He changed blocks and the 3rd cam still 
>lives.  The problem I see with spraying or hard chroming the journals is 
>hole probably isn't round.  You got the side loads from the valves and the 
>turning loads from the cam gear.  Unless you build them back up and then 
>bore them or bore them and insert bearings, I don't see how you would get 
>round holes.
>
>I'm one of the people who know the problem exits and chose to ignore it.
>
>dp
>
>PS.  I'm using a new mail program and Smitty isn't a know word.  If spell 
>checker accidentally changes you name to something else, it isn't intentional
>   ----- Original Message -----
>   From: Smitty Smith<mailto:vairologist at verizon.net>
>   To: virtualvairs at corvair.org<mailto:virtualvairs at corvair.org>
>   Sent: Sunday, February 05, 2006 2:57 PM
>   Subject: <VV> Cam Bearings
>
>
>   Smitty says:  I don't know what will turn up on the digest but I got 
> plenty of personal answers to my question.  All the persons knowledgeable 
> on aircraft engines noted that the standard procedure is to weld up the 
> block journals and rebore them.  Every one also noted the expense of 
> doing so.  Not what most of us are looking for.  The second most logical 
> answer was to get the area on the cam bearing, metal sprayed. and turned 
> down to specs for the block they were to be used in.  No one mentioned 
> that they had any estimates of cost for that though.  The idea of 
> building up the camshaft with chrome was not addresseed by anyone but 
> me.  I will check that out on my own
>     The thing that surprised me was that every post I got admitted that 
> the problem exists but no one was doing anything about it.  Just shove a 
> new cam in and go for it.
>     Ideas were submitted like boring the block holes oversize and pegging 
> in inserts machined to fit.  Or boring oversize and providing bushings 
> with shoulders on the ends to hold them in place.  Good ideas if someone 
> wants to become a millionare (or a thousandare).
>     Best answer on line boring was---  Every line I write is boring.

__________________________________________________________________________
Rad Davis:                                        rad.davis at comcast.net
Corvairs--65, 66 Corsa coupes, '65 'brier Deluxe   http://www.corvair.org/
Keeper of the Forward Control Corvair Primer: 
http://www.mindspring.com/~corvair/fc1.html
"We did Nebraska in seven minutes today. I think that's probably the best 
way to do Nebraska."                            --Brian Shul, _Sled Driver_