Maybe because of the type of combustion chamber, which resides INSIDE the
piston itself.
Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>

On Fri, 10 Jul 1998 17:44:56 -0400 William Dummitt
<williamd@COMPUSERVE.COM> writes:
>Any time I've taken apart an automobile engine, there is the
>ever-present=
>
>ridge at the top of the cylinder at the limit of piston travel.  The
>exception is the one and only waterboxer engine I've rebuilt- it had
>no
>ridge at all despite 120k mi.  After cleaning and honing there wasn't
>eve=
>n
>a trace of a ridge, even though I had a ridge reaming tool ready to
>go.  =
>Is
>this the norm?  =
>
>
>Bill
>

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