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Missing Engine Breather ?

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Missing Engine Breather ?

Post  Clifford on Tue May 12, 2009 8:29 pm

Hi all. When I bought my Scamp I pointed out to the seller that the breather outlet from the rocker cover wasn't connected to anything. He said that it had always been like that and there had never been a problem. Now, as the engine bay isn't covered in oil, I assume the outlet must be blocked off inside the rocker cover, which doesn't seem right to me. I would have thought there should be some kind of filter between this and the manifold. Question is ....... am I missing something?</A></A>
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Re: Missing Engine Breather ?

Post  Martin & Nettie on Tue May 12, 2009 9:11 pm

If I remember correctly that breather went to a pipe on the old pancake air filter and it has probaly been blocked off like your water heated inlet manifold.
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Re: Missing Engine Breather ?

Post  Mk3rob on Tue May 12, 2009 9:29 pm

Hi Clifford

Yes it fits to my air filter which i havent got anything connected to either Laughing

OK i have just looked in my old BL workshop manual. 1972 Issue 7

It shows your rocker cover outlet pipe connected to the single carb round pancake type filter.

So with your twin carb setup i dont know, i think you will find inside the rocker that there is like a baffle plate to stop splashes of oil going directly out of the pipe.

My 998 Scamp, W reg, single carb with pancake filter does not have a pipe on the rocker cover but it does on the filter ????? . I can only think that you have an old rocker cove,r then they did away with it.

Regards Rob

ps OK Martin you type faster than me. Isnt it past your bed time or is it Nettie?
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Re: Missing Engine Breather ?

Post  johnonthetyne on Tue May 12, 2009 9:50 pm

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Breather

Post  m3prq on Tue May 12, 2009 10:08 pm

Hi my 998 also has that pipe blocked off,it has another breather outlet,thou

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Re: Missing Engine Breather ?

Post  johnonthetyne on Tue May 12, 2009 10:19 pm

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If I remember correctly that breather went to a pipe on the old pancake air filter and it has probaly been blocked off like your water heated inlet manifold.

Post  minibuger on Tue May 12, 2009 11:05 pm

the pipe on top is not for a water heated mani it for the servo pipe.it easyer to change the rocker cover and do away with the breather pipe and looks bet too nice chrome one would look nice Smile if its a A series engine there should be a breather on the tapet chest cover on the back of the block only the 1275 thick block had breather in rocker cover as had no covers on back of block and the later had a breather on the bell hoseing like the later A+ Block.Thats if i remeber right???????
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Re: Missing Engine Breather ?

Post  TRR Motorsport on Wed May 13, 2009 9:28 am

minibuger wrote:the pipe on top is not for a water heated mani it for the servo pipe.it easyer to change the rocker cover and do away with the breather pipe and looks bet too nice chrome one would look nice Smile if its a A series engine there should be a breather on the tapet chest cover on the back of the block only the 1275 thick block had breather in rocker cover as had no covers on back of block and the later had a breather on the bell hoseing like the later A+ Block.Thats if i remeber right???????

You're cock on mate! Laughing
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Re: Missing Engine Breather ?

Post  wheeliebin on Wed May 13, 2009 1:10 pm

Mini engines always seem to benefit from as many breathers as possible. Leave that rocker cover on, and run a long bit of hose out of the bottom. That, so my MoT man informed me many years ago, helps to prevent "EGR" or exhaust gas recirculation. Apparently that is when oily air gets sucked into the carbs, upsetting emissions.
The bit of pipe on top of the inlet manifold also has a flat round "emissions control valve" on top on a Cooper "S", with the servo hose out of the side.
Does that sound right?
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Re: Missing Engine Breather ?

Post  minibuger on Wed May 13, 2009 2:49 pm

Sounds right to me but if you change you oil reg the emissions won't be a prob .Poss 7 out of 10 car i test with high emissions is due to dirty oil and filters .
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Re: Missing Engine Breather ?

Post  wezgit daan saaf on Wed May 13, 2009 9:35 pm

That's the beauty of a kit car,the emmisions test is just a visual check and you don't have to stick that horrid little pipe up it's bum.
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Many Thanks

Post  Clifford on Thu May 14, 2009 8:33 pm

Thanks for all this advice and info. There was me thinking the rocker cover outlet might be piped into the stub on the inlet manifold, but now I know different. I am wondering now just what engine it is though, but that will be my next post.

I can't connect the breather to the air filter very satisfactorily as with these tiny little sporty pancakes I've got it would be feeding straight into the carb. so the throttle would soon be coated with oil vapour and get crudded up. The engine seems to be running fine and whilst I'm a great believer in "If it aint broke, don't fix it" I don't like the idea of not having any breather at all. My best option seems to be the nice shiny chrome filter, which I should be able to pick up this Sunday if I make it down to Brighton.

Then there's the question of where to fit it. Perhaps run the pipe out through the wing and up the side of the windscreen, then people might think I've fitted a snorkel ! Wink
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Re: Missing Engine Breather ?

Post  wezgit daan saaf on Thu May 14, 2009 8:42 pm

Alternatively,you could point it downwards and blow bubbles when off roading!!!!!!!
Just let it vent to atmosphere,pipe it away from the air filters though.Altenatively,if it is a 998 has got a breather on the tappet chamber, if so stick a later rocker cover on it. If it's a 1275 it will need 2 breathers one on the timing chain cover and one on the geargox bell housing(near the stabiliser bar).
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Thanks for all this advice and info. There was me thinking the rocker cover outlet might be piped into the stub on the inlet manifold, but now I know different. I am wondering now just what engine it is though, but that will be my next post.

Post  minibuger on Thu May 14, 2009 10:18 pm

What the engine number ? A lot of mini owners try to get there cars to look older than thay are and same with the engines ie twin carb's ,rocker box . Looks like a later 1100 head to me .May be wrong .
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Re: Missing Engine Breather ?

Post  Rum Tum Tugger on Fri May 15, 2009 8:01 am

My best option seems to be the nice shiny chrome filter

Decorative but otherwise pointless - isn't there an air vent in the oil filler?
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Problem Solved !

Post  Clifford on Fri May 15, 2009 11:11 am

Solved the mystery at last as I found the breather on the tappet chest, just where several of you said it should be, easy to find when you know what you are looking for!

The rocker cover is obviously off a different engine so now I'm on the lookout for a correct one, no hurry though now I know what's what.

I'm sure this Scamp has a few more red herrings up it's sleeve to provide future puzzlement for me.

Thanks again for all the help and advice.
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Re: Missing Engine Breather ?

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