[s-cars] Fw: Crank bearings - AAN

[ccohen5]

Scott has chimed in to correct me on this already.  You are quite right and
this was my misread and mis-statement.

Worthy of Phil P's monkey lads!

Colin

----- Original Message -----
From: "Aaron Taylor" <aaron at sunvalley.net>
To: <QSHIPQ at aol.com>
Cc: <ccohen5 at compuserve.com>; <s-car-list at audifans.com>
Sent: Thursday, May 02, 2002 12:21 PM
Subject: Re: [s-cars] Fw: Crank bearings - AAN


|
| Sorry - I know nothing about rebuilding these specific motors but...
| With the power on the DOWN stroke wouldn't the reaction at the bearing be
on the
| LOWER half of the bearing thus requiring the harder material on the lower
half or
| am I missing something.
| Aaron
|
| QSHIPQ at aol.com wrote:
|
| > --
| > [ Picked text/plain from multipart/alternative ]
| > Colin:
| > Just in lurk mode for a while.  WRT you post, the hardened shells go ON
THE
| > TOP (the suffix 701B - the expensive ones).  You put them on the bottom,
the
| > motor will last about 10 minutes or so.  Remember, the power is on the
down
| > stroke....
| >
| > That said, the 701 non hardened, and the 701B are interchangeable, so
yes the
| > 701B can be used top and bottom for a stronger motor.  I've done this,
can't
| > really comment on longevity, as the mileage hasn't acumulated enough on
any
| > of the motors.
| >
| > Given the construction of both, I'd not hesitate to use 701B top and
bottom
| > on a motor rebuild.
| >
| > HTH
| >
| > Scott Justusson
| > QSHIPQ Performance Tuning
| > Chicago
| > In a message dated 5/1/02 5:11:33 PM Central Daylight Time,
| > ccohen5 at compuserve.com writes:
| >
| > | The family bible is specific about a top and bottom bearing and I
believe
| > | from Scott J, that that bottom (yellow/purple) is harder than the top
| > | (yellow).
| > |
| > | So my question is (in the absence of Scott J who may have unsubbed for
a
| > | while) can you use the harder bearing on top and bottom without
increasing
| > | wear on the journals.  I have not done this extensive a rebuild in 20
| > years,
| > | but I recall from my Cooper S that a softer bearing surface as in the
| > | Vandervell's for eg. were more desirable in order to prolong the life
of
| > the
| > | journals.  Obviously there is a trade off, too soft and you have to do
a
| > | bearing rebuild every few years, and too hard etc etc.
| > |
| > | Has anyone ever used the bottom bearing for both top and bottom?  Any
| > BTDTs
| > | to offer.
| > |
| > | TIA.
| > |
| > | Colin
| >
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|