[Vwdiesel] Ring Break-In and Oil use... Alien view

[James Hansen]

Harder driving = higher cylinder pressure = rings pushing on the cylinder
walls harder = more friction = faster break in. Could be called "wearing in"
to be more descriptive.
...later...

I read the site posted.  Mostly what I said before.  The most controversial
motorsports web page on the net?  Gee, he needs to get out of the shop more.
Most mechanics know and practice this routinely.  I do agree with his point
about changing the oil after 20 miles, and that's not always done.  I've
always done this to get the big cooties, bits of rag lint, dust etc out that
are inevitable to those of us working in non-clean rooms, along with
grindings from the rings.

Cylinders are not oval, neither are rings, however they may eventually wear
that way from rod thrust etc.  Manufacturers really bust their britches to
get rings perfectly round when at installed diameter, and if you have an
oval set, you got ones for the wrong bore.  However, what is present to make
them turn?  The cylinder goes straight up and down, and there is no
rotational motion on the piston...  bike rings are pinned to keep the piston
installer (human one) working properly, so the gaps are away from the ports
so they don't hook.
Pinned rings = leaky rings. or increased chance of leakage anyway.
-James

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]On
Behalf Of Mark Shepherd
Sent: Wednesday, March 02, 2005 8:29 PM
To: vwdiesel at vwfans.com
Subject: [Vwdiesel] Ring Break-In and Oil use... Alien view


>http://mototuneusa.com/break_in_secrets.htm

>Here is an interesting read on break in techniques. I know
it refers to
>spark ignition engines but I would think there are some
valid points.

>Troy

I remember finding this link a couple of years ago and if I
didn't post it here I'd posted it over at Yahoo...
It's a very interesting site which has originated AFAIK from
the knowledge developed by motor cycle engineer/enthusiasts
and was found to apply to cars etc too.
Read the section on 'unenlarged' intake valves for optimum
powers at high RPM...

One thing that defies explanation (especially when talking
to myself ;o) is how hard driving beds the rings in when the
rings are free to rotate? All I can picture is an oval
rotating inside an oval (I'm trying to think of which of my
previous engines had the alignment pins in the ring channels
that stopped rotation of the rings and so would allow
true[er] 'bedding in' Maybe reinstalling this item would
improve both the bedding in and keep gas leakage/blowby down
by maintaining  maximum leakage path....
Chew on that guys.
Mark-The-Miser-UK

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