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 Post subject: SC12 Questions
PostPosted: Thu Jun 19, 2008 10:52 pm 
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998cc
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Joined: Sun Sep 24, 2006 4:17 pm
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Location: Caroline Springs, VIC
Hi im slowly getting my Sc12 together just need a few bits from here and there for the A+ motor swapping from the old 1100.

a few questions. the pipes from the sc12 provided in the kit (black tubing with the T piece) does that go to the carb advance?

What breathers will i need on the engine minimum and what signs tell me im lacking breathers? the only one i will have running at the moment is on the clutch housing.

Thanks for all your help cheers chris

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 Post subject:
PostPosted: Fri Jun 20, 2008 10:24 am 
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1275cc
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Location: Adelaide, SA
Yes, I think the black pipe does go from the 'charger breathers to the advance nipple.

Curiously I found the car functioned better with the pipe plumbed to the emmission inlet on the side (not fuel bowl breather, the other one).

But both work better than not plumbed, and vented to atmosphere. Atmosphere venting is bad in this case, seems to dump oil out of the 'charger. But when connected to the carby it doesn't use any oil at all.

Either way, try a few things and see what works best, but obviously do what Ben says first. :wink:

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T 8)


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 Post subject:
PostPosted: Fri Jun 20, 2008 10:31 am 
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1275cc
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Oh, question 2.

Now I should know a alot about this.

I had clutch housing and side cover breather, with little filters on end of them. It was all good for a while, then it started using oil, dumping out the side cover breather actually.

I then found my clutch cover breather was blocked (with all that mesh crap inside! It traps all the gunky oil up! :x ), and there was too much crankcase pressure, so something had to give. Cleaned out that breather and presto, all was good again.

But in not too long, it all happened again. So this time I got a catch can and plumbed my breathers in. Did away with the side cover breather, as it was getting too messy with all the supercharger bits being up that end. And put a breather on one side of the rocker cover, ran both clutch cover and rocker cover to a catch can. All was good.

Then it slowly started burning oil, getting worse and worse, found once again my clutch cover breather was blocked, cleaned it out, oil burning died but didn't disappear. Fitted another breather to the other side of th rocker cover and got better. Not perfect, but not bad.

Basically, I think what's happening is that compressed air is going passed the rings and compressing the crankcase, so to reduce the pressure it needs to breath. The more breathers the better.

Clutch cover only won't be enough, and make sure its always clean. 2 breathers, minimum IMO.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T 8)


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 Post subject:
PostPosted: Fri Jun 20, 2008 11:36 am 
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998cc
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Joined: Sun Sep 24, 2006 4:17 pm
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Location: Caroline Springs, VIC
thanks for that i assumed that two minimum might be the case. i think ill have to plumb up a second somewhere and run a vaccum setup to the carbie that should do it. thanks for the advice

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