Breather query

[minitravellerman]

I'm running an MG 1300 unit (no breather on block and no inspection plates). Also I have no breather on the clutch casing (I'm using a later one).

Any suggestions for breather?

I'm going to use the rocker cover with breather pipe but thinking of modifying this to link into an oil catch tank in the inner wing which will have it's own breather. Do youse think this would be enough??

[rich@minispares.com]

unless you where really thrashing it, and the rings are ok then I think it would be fine


its when they are been really cained that more breathers are required

[andy1071]

I have also heard that the A series tends to feed a lot of oil to the rocker cover area (though the way the rockers wear, you wouldn't think so! ) -one cause might be the lack of drainage back to the sump....
This tends to show itself on long, high speed motorway runs.

Of course, from a power point of view, having a good crankcase breather feeding into the inlet (by "good" I mean it vents air not oil!!) creates a lower pressure in the crankcase, which helps to reduce the amount of oil held in suspension, and being whipped around by the crankshaft, -thus reducing crankshaft drag and lowering the oil temperature.
The lower crankcase pressure also helps with piston ring sealing.

-These aren't huge effects, until you get to highly tuned engines. But every little helps, and if you have a piston ring problem, or temp problem, it can give you that extra bit...

/Andrew

[minitravellerman]

The unit I'm running is a 1293 with only mild road tune. For the most part I'll only be tottling about locally to shows or out on the odd Sunday drive. I hope to perhaps do some longer stints on motorways to the likes of Goodwood, MITP or similar on occasion, but again only at tottling about speeds - no motorway thrashes at 80+!!

Hopefully the breather on the rocker cover will suffice