Hey guys,

I'm swapping the standard rocker cover over to an aluminium type on my mini K and was wondering if the breather/pcv on the top of the original one that feeds back into a spacer on the carb is needed or can i replace the oil filler cap with a breather/steel mesh type?

The push rod cover breather is pinched off and no longer there. If I replace the cap with a breathable type, do I need to fit a catch can to the new aluminium cover? this would mean drilling and tapping a fitting into the new cover, something I would prefer not to do.

Cheers,

Sean.

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1970 mini k1100

Sean, it sounds like you have an early 1100 clubman type system

if that`s the case then i`d suggest swapping the side-plate breather over to a "canister-type" one that is open & then run your breather from there to your carby inlet spacer

if the spacer you`re talking about is in fact a clubman type one then it will be fitted in-between the carby & the air-filter housing yeah??? so if that`s right then you won`t need to fit a PCV valve into the system anywhere at all, just the hose from the new "canister-type-breather" on the new side-plate, straight to that carby/filter spacer plate ok?

that way you won`t need to stuff around with your new rocker cover

got it?

however,,, in saying all that--> there are many ways to stuff a chicken

edit--> & no , because you don`t have very much suction at that spacer plate, you won`t need a breathing oil-filler-cap... just remember that it`s not the best place to take your breathers to,,, theres very little suction happening at that spacer plate, that`s one of the reasons why the factory changed that system

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Yeah,

The system you have described sounds similar to mine. I believe the engine and head are original although the carb set up may not be.

I am converting over to twin 1 1/4" SUs also, and my inlet manifold does not have an inlet for a breather tube (lynx manifold) so I'm unsure where I would run the breather to If I were to convert back to a side breather set up? I have a reproduction cooper airbox set up to go with this, and there is also no fitting on this for a hose.

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1970 mini k1100

Well,,, the later type HS2`s have provision for breathers to go into the side of the carbs,,, have you got your twin carbs yet?

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Yes, I have. Unfortunately they are the pre breather type. I just wonder, If my car is pre pollution control era, then is there any reason why I can't fit a breather type filler cap and do away with the line back into the engine? Or will this have consequence on performance of the engine. ie; shoot oil all over my engine bay...

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1970 mini k1100

i always suggest (for road use) at least one breather for small-bore engines... & at least 2x breathers for 1275 & bigger engines .

& , sorry but the breather-type oil filler cap isn`t really breathing much at all & when you rev your little engine it will produce some crank case poressure which that oil filler cap will not be enough to relieve effectively enough so your engine will tend to leak through oil seals & gaskets & such because of this lack-of breathing situation

i`d suggest even an open "canister-type" side-plate breather even just open to atmosphere into a catch bottle or clamp a filter onto it, would at least be "something" to allow the pressure to escape at least

i really do like it all being sucked out tho,,, sounds kinky i know but it feels good

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Thanks for that miniman, I'll have to look into sourcing a cover of sorts and work out how to let it breathe.

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1970 mini k1100