thats one lost in translation

unfortunatley the engine builder is a major part of the team sacking him would mean no team
we are trying to play to peoples strengths rather than its "my toys you cant touch them"

Sean touches his toy most nights...

>sigh<

OK boys back to the drawing board

Decided to strip the engine to investigate the piston rings. As clearly shown in the photos, there is NO blowby at all. As I also wrote earlier, there is no blue smoke whatsoever.

Compression ring is tight as a virgin 0,20 mm
Compression/oil scraper ring 0,28mm
Oil scraper ring OK

(valves and guides good)

So we can eliminate rings

Why is the air filter housing filling with oil???

Is it possible for the rings to perform OK at the top end of the barrel - eg so you don't get blow by oil going into the combustion chamber and thereby no blue smoke through the exhaust - but don't make a good seal at the bottom of the stroke so that exhaust gases start to pressurise the engine and thereby blow oil into the filter box?

No I tested both ends of the barrels

Peter,
the top rings look fine and dandy, but what is the gap on your oil control rings?
I've just checked in a box of 'might be OK for a banger' cast-offs and the best of those has a gap of 1.2mm when fitted into a barrel.
I haven't got any new rings of that type to check, but I'm sure that the gap should be less than what's visible in your photograph.

ken


Oil control ring gap by slcchassis, on Flickr

That oil ring gab is normal on those rings. They are all like that. Whatever oil not removed by the scraper rings are removed nearly 100% by the next ring combination ring being the oil scraper/compression ring

Should add that the 2 top rings are spot on not allowing any blowby.

I'm wondering if the oil breather (Ecas) can't cope with M28 engines. They are fitted with a massive internal oil filter leaving little air to move. Having a near ''perfect'' combustion chamber, the suction is quite high and maybe just drawing the oil past the oil breather