20V engines

[isham-research.freeserve.co.uk at pop.pol.net.uk]

> I assume you're talking turbo 20v engines here. Otherwise the 7A would
> probably be considered the first

Yes, I was.

A further note about the I5s.  Those that nominally exceed 200bhp -
starting with the RR - use different upper and lower big end shells.
The upper shells are supposedly sputtered and cost four times what
the lower ones cost.  On some engines (e.g., the ur-S4 AAN) the main
crankshaft bearings get the same treatment.

When I stripped my MC-2 after nine months with Scott Mockry's ooomph
I found the shells worn asymmetrically - all of the upper big end
shells had crescent-shaped wear patterns with the curve of the
crescent facing forwards.  I know the engine was run for five hours
with zero compression in #1 - was this the cause, or did I exceed
the capability of the shells?

Has anyone found 20V-type shells for the 10V engines?

--
 Phil