[Diy_efi] Venturi effect crankcase breather

[Adam Wade]

--- Jack Vines <jackv at ambassadorprograms.org> wrote:

> Can you help me better understand what specific
> factors involved in pulling a vacuum in the
> crankcase cause the dramatic drop in engine life
> and which parts wear faster and why?  Are we talking
> ring wear, bearing wear, piston skirt wear?

As I was led to understand by the Harley engineer (who
is also a race engineer for several AMA Formula Xtreme
teams, I should also add), there was significant
additional ring wear once you got past a certain level
of depression in the crankcase.  He didn't go into too
many details, but I suspect there may be bending of
the ring with fairly low pressures that cause the wear
to be concentrated on the upper edge of the ring face
(although this is merely supposition on my part).

=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
| "It was like an emergency ward after a great catastrophe; it  |
|   didn't matter what race or class the victims belonged to.   |
|  They were all given the same miracle drug, which was coffee. |
|   The catastrophe in this case, of course, was that the sun   |
|     had come up again."                    -Kurt Vonnegut     |

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