Yeah I'd agree with above, I got plenty of open air breathering, still mayo. Interestingly I had to take out the breather mounted on the clutch cover yesterday to get to some stuff and it was full of mayo, I got most of it out, but I'd never checked there, but i wasn't alarmed, it's no big deal at all.

Just another standard part of owning a mini.

_________________
1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

The problem with open breathers is that they don't work!
You need the suction from the inlet to suck the water vapour out of the engine so it does not settle in the oil seperators and rocker cover.

If you're wondering where the water vapour comes form?
I've been told for every litre of petrol burned about 1.25L of water is produced, in the form of water vapour.
Most goes out the exhaust, but some finds its way past the rings into the engine crankcase. If engine parts stay cold enough it condenses... usually in the upper parts eg the rocker cover.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Well I did say in my first post, that thers moisture in the air. I think that would have some effect. After all theres air in the rocker cover, air in the breathers.

Open air breathers - I use them because my car doesn't legally need ugly pipes running around the engine bay. Also I agree, that it might not work, but wouldn't there be a slight power loss with the hoses connected? Or not, as it would only have big vacuum whilst decellerating?

_________________
1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

Ugly pipes? I'm talking 1 hose here...
The naysayers told me before MRC dyno day I would lose power with a Dellorto or Weber AND a balance pipe, AND a PCV.
Hey 86.6 at the treads ain't bad for a roady A series without a huffer.
Only time I take the PCV valve off is for track days, and that's only because on fast LH bends at high rpm oil gets flung up the flywheel housing breather from the drop gears with a PCV fitted, and it makes like JB007's Aston.
Wouldn't do that with an S block and breather....
It goes back on before I drive home.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

From what I understand engines will make more power with a vacuum in the crankcase. F1 engines run a heap of vac.

Fair call.

Probably worth an investigation. Not me of course, but yeah.

I've found that all the breather pipes end up doing is putting oil (on hard cornering of course) up and back into the manifold, not nice. But on legal requirement of late cars. This was not my car but another mini, in which I've driven.

PS. My block is an S block, has rear tappet covers and breather, therefore two ugly pipes. Your right though, thier not long pipes, but still, IMO the less pipes the better, makes for nice looking engine bay for shows. But not important.

_________________
1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

the reason for the mayo could be the rocket under the rocket cover?

Rocket?....

hehe.
If your talking to me?? Nah I don't seem to have mayo issues, used to but, the car warms up much quicker these days, and it jsut doesn't seem to be an issue.

If your talking to someone else.....ok.

_________________
1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

My K (when i had her) used to get this all of the time in winter, but it went away in summer.

I just contributed it to condensation and left it at that. Never had any ill effects from it, i just made sure i wiped the foam out of the cap when i did an oil top up each weekend.

nothing wrong with a splash of milk in your texas tea

_________________

And - that is the summation of the thread