On 23/07/2020 23:25, T i m wrote:
On Thu, 23 Jul 2020 22:25:06 +0100, newshound
wrote:

snip

There are 4/ tools out there now that are 'dry sump' so although they
use valves (like a 4/) they get their (upper cylinder particularly)
lubrication from the fuel, like a 2/.

Whilst that may go some way towards the efficiency (less
over-scavenging), they are still burning oil?


They will certainly have roller bearings for mains and big ends (like a
2 stroke) so only need a whiff of oil.

So not like my old British Seagull outboard motor then (with it's 10:1
fuel/oil mix). ;-)

I still find the lack of bore
wear in modern engines astonishing having been brought up in the days
when you regularly had to re-bore bikes and even cars.

Funny you should mention that. Daughters 2001 1.2 Corsa brought up the
EML and she used one of my BT OBS dongles and Torque app on her phone
to read then reset the codes. One came back, misfire on Cyl4.

A compression test showed Cyl4 very low but was brought back in like
with the others with a drop of engine oil.

I'm guessing it may be a broken ring, rather than a worn bore?

Still, it has done over 205,000 miles now ... ;-)

Cheers, T i m

great engines no cam belt etc mine has done 105k ...