17 replies to this topic

[998dave]

Dave, most 1275's don't have tappet covers anyway. Only Cooper S 1275 blocks do. The breathing on 1275 blocks is from the timing cover and the clutch housing and you will need to vent the timing cover when you build a 1275, as well as the other end. If you don't the timing chest pressurizes and the crank oil seal will fail very early. I run with both the tappet covers blanked off on my 998 and a breather in the timing cover and clutch housing as 1275's have. Keeps it all nice and oil tight.

PCV valves haven't been in use on Mini's for decades.

The oil filler cap is also part of the breathing system, as that's where the fresh air comes into the engine from. That's why you have to change it as part of the service schedule.

oooh, i didnt use that,
And surely they use PCV's, most 'modern' vehicles do... :-S don't they?

Sure they do, we used to replace them with out blow-by meters on the test engines...

[Dan]

The cap has a filter in, which is basically a lump of wire wool. You can strip and clean the cap filter (well, you could on the old black ones, the newer red ones are sealed for life) but it's so much easier to just replace it.

PCV's are soooo sixties man!

The pipes from the breathers all just feed straight into the carb, they changed where the pipes are connected into the inlet system so that the valve isn't needed.

[Pavel]

Or for a kick instead of piping the breathers into the carb, pipe them into the cabin, and your mini will fly (or at least you'll think you're flying.. but not for long)

Note: DO NOT DO THIS!