On 1100S they were run as per M1100's post above. But they used the big round Smiths PCV valve.
Cooper S (except Police pack) were the same, except the breather was on the side cover not the flywheel housing.

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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.

I'm just throwing this out there......but.......

I know crankcase breathing is used to remove the pressure build up from the cylinder blowby, but doesn't it also allow for the removal of the fumes so as they don't mix with the oil and degrade the oil? I remember Doc mentioning a while ago that if an engine sits for a long time with old "acidic" oil it "etches the journals" or something along those line.

My question with the breathers is, don't you want a way for the breather system to take air from the airfilter, draw it through the engine to remove these "fumes", and then suck it into the inlet manifold via a PCV valve?
I think this is basically close to a standard emission setup, and I know I haven't even mentioned the charcol canister yet either!

Cheers Shane

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If it's not a Cooper S, the mini was designed to be modified!

None of the earlier 1275s with PCV fitted took air from the air filter, and they had no charcoal canister back then.
They drew air in through a `filter' in the oil filler cap.

Late cars with vac port on the SU took air in from the charcoal canister, through a restrictor hole in the rocker cover. See my earlier post near top of thread.

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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.

rerouted mine. is this correct??

Yeah that looks OK. Well done...

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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.

it drives better i must say. it got rid of majority of the smell. after doing the hoses we tuend the carb. not stinky at all now.

it also idles better! lol

Before I do this I just want to check that I am doing it right.

Crankcase breather through a PVC valve back into the manifold.
Where should the Rocker cover breather go? Into the PVC or should it go to the air filter?

Cheers Ryan

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Ryan Filippi
Minis In The Gong
[email protected]
www.minisinthegong.com.au

Just block it off for now, and then keep an eye out for a rocker cover without one. ie set it up as per Morris 1100's setup. It looks like you have the correct breather cap already. Air goes in thru the cap (which has a filter built in) and out thru the clutch breather/pcv/manifold.

PM sent

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Just a question for Morris,

Where does the hose from the angled pipe off the head go to? To the exhaust manifold? Is it plumbed into the PCV valve?

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"Beware the lollipop of mediocrity: lick it once and you'll suck forever" Brian Wilson

I know its for Morris, but its New Years Eve and everyone gets to steal someone else's reply

Its the heater take off which returns water via the heater to the radiator bottom hose. In this case its been used for a heated inlet manifold which delays icing up in cold and humid conditions. Not really required in most parts of Oz.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

What size brass fitting is that in the side of the rocker cover?

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http://www.flickr.com/by_dan
Current: 1970 Mini K 2014 Focus ST
Past: 93 Rover, 64 850, 97 Rover, 66 Deluxe, 66 Moke
81 Austin Estate, 2006 R53MCS, 66 Deluxe, 1978 Clubbie
2014 Land Rover Defender 90

Thanks Mick!

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"Beware the lollipop of mediocrity: lick it once and you'll suck forever" Brian Wilson

It's an airline push in quick connect fitting, 12mm tube x 1/4 BSP thread. The bottom one is the same.
The tube is 12mm OD nylon, it stands the engine bay heat fine without kinking, whereas other common airline tube eg polyamide does not.
You don't need to worry about this mod for a smallbore or S motor, as they don't have any oil drainback restriction down the pushrod holes (as they have a side oil gallery instead).

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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.

would i be correct in saying you could put a cheap "oil catch can" in line between the crank case breather and the intake manifold, to minimize any oil making it into the intake?

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1969 Blue Mini K, 1330cc, Weber 45, polished aluminum roll cage, Race seats, 4 point harness, full rewire incorporating 8 fuses, 6 relays and new headlights just needs tyres front shocks and a windscreen til re-register

The breather can mounted on the flywheel housing is commonly referred to as an oil separator. But it's not, really it's just a flame trap.

You can fit a timing cover breather as used on later 1275s, but on a roundy it has to be flattened a fair bit to fit with the radiator..

There is also a fuel pump flange mounted breather sold by minimania.com in USA which `might' work. I made one from an S canister 10 years ago, but without any baffles in the bottom, the crank & rods tossed oil straight up it once past 4500rpm. So, I binned that idea.

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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.