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Oil Leaking From Clutch Housing and Supercharger Breather Set Up


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#46 sonscar

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Posted 24 July 2021 - 03:31 PM

This is just my take on it for a road car.Vented oil filler cap and no other breathers in the rocker cover.All other breathers to a sealed catch tank.Output of catch tank to carb inlet,all sealed.A pcv valve would be a nice addition(google it)

if the blowby passed the rings is severe enough to leak past the clutch seal you could be changing this daily and still not curing it.You are looking for a slight vacuum in the crankcase.Road engines have not vented to atmosphere for decades and it is not just environmental concerns.

I think it was General Motors who perfected Positive Crankcase Ventilation(pcv) and did not patent it as they wanted everyone else to benefit from this.

At the end of the day you do what you have to do,Steve..



#47 sam138

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Posted 30 July 2021 - 06:34 AM

I've set up my breather system as per below pictures now, it's got 1.2" hose coming from crankcase going to a tee where the old fuel pump hole joins up using 5/8" hose and then both go to the catch can in 1/2" hose. I then have a 1/2" hose back to the rocker cover on the outlet of catch can. 

 

Is this correct ? should I have another connection on rocker cover which also tee's in with crankcase/fuel pump ? 

 

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Edited by sam138, 30 July 2021 - 06:39 AM.


#48 sam138

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Posted 10 August 2021 - 08:42 AM

Bump

#49 Dusky

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Posted 10 August 2021 - 02:31 PM

Ditch that filter and connect it to the carb or manifold through a pcv valve.

#50 sonscar

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Posted 10 August 2021 - 03:10 PM

I believe it has been advised some times before.Road cars benefit from suction applied to the crankcase to reduce emissions(and we all like to be as green as we can) and help suppress leaks,Google PCV and expand your knowledge to be Mini specific.Steve..



#51 Icey

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Posted 10 August 2021 - 03:17 PM

I can’t work out what you’ve done there. But you don’t want the breather system open to atmosphere. Plumb the vent that has the filter on to the carb or anywhere that’ll only see vacuum.


Edited by Icey, 10 August 2021 - 03:20 PM.


#52 sam138

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Posted 13 August 2021 - 03:09 PM

Thanks for the reply’s, in the second picture the left hand pipe comes from the crankcase into the t piece with the old fuel pump coming up into the bottom of tee then both going off to right into catch can. The feed I have back to the rocker cover should this go to carb intake instead then with an inline PCV valve ? I’m slightly confused as most suck through supercharger set ups I’ve seen pictures of have a similar breather set up to mine.

Edited by sam138, 13 August 2021 - 03:26 PM.


#53 sonscar

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Posted 13 August 2021 - 05:18 PM

Small observation about life...just because most do it that does not always mean that it is right.Google is your friend,use her.positive crankcase ventilation is your search,it will not be Mini specific but the principle is valid.Steve..

#54 Steve220

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Posted 13 August 2021 - 06:58 PM

I wouldn't put engine breather back into the inlet on a charged engine. It lowers the fuel octane rating significantly, increasing the chance of detonation.

#55 NZMini1275

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Posted 13 August 2021 - 07:49 PM

I’m with Steve
You have a performance supercharged engine
Why would you set it up like a standard engine
On mine I have following
Clutch breather to rocker
Old fuel pump to rocker
Then rocker to vented catch can
This way allows any oil to drop out into rocker before going to catch can. When I had them routed directly to can it would fill with oil during track use

#56 Dusky

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Posted 13 August 2021 - 08:07 PM

I’m with Steve
You have a performance supercharged engine
Why would you set it up like a standard engine
On mine I have following
Clutch breather to rocker
Old fuel pump to rocker
Then rocker to vented catch can
This way allows any oil to drop out into rocker before going to catch can. When I had them routed directly to can it would fill with oil during track use


Because it's not a track only car. The only reasons racers don't run pcv is because it's 1) not allowed sometimes 2) slight oil contamination could lead to pinging.
I hope you change your oil too after every trip, being a race car car and all.

#57 sonscar

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Posted 13 August 2021 - 11:26 PM

I bet modern blown motors which are almost race engines all use closed circuit breathing.If the blow by is enough to cause detonation you probably have greater problems.I qualify this by saying I am no race engineer.Steve..

#58 NZMini1275

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Posted 14 August 2021 - 06:53 AM

I bet modern blown motors which are almost race engines all use closed circuit breathing.If the blow by is enough to cause detonation you probably have greater problems.I qualify this by saying I am no race engineer.Steve..


Pretty much zero comparison with an old a series with no ecu etc running a suck through supercharger 🤣

#59 NZMini1275

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Posted 14 August 2021 - 07:03 AM

I’m with Steve
You have a performance supercharged engine
Why would you set it up like a standard engine
On mine I have following
Clutch breather to rocker
Old fuel pump to rocker
Then rocker to vented catch can
This way allows any oil to drop out into rocker before going to catch can. When I had them routed directly to can it would fill with oil during track use

Because it's not a track only car. The only reasons racers don't run pcv is because it's 1) not allowed sometimes 2) slight oil contamination could lead to pinging.
I hope you change your oil too after every trip, being a race car car and all.
Who mentioned track only car ?
And yes I change oil quite often
I have no problems with oil leaks so why would I need
Pcv?

#60 sonscar

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Posted 14 August 2021 - 07:06 AM

But the motor in question is a high performance supercharged engine,Steve..






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