JamesyCottony
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| posted on 29/10/15 at 11:25 AM |
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Carb Vents
There are 2 pipes coming off the side of the carb which at the moment are not attached to anything, I believe they are breather/overflow pipes, so do
they need to be atached to anything or should I run them out of the engine bay?
Cheers
[Edited on 29/10/15 by JamesyCottony]
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jacko
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| posted on 29/10/15 at 11:49 AM |
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May help if you say wat engine and carb you have
Jacko
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JamesyCottony
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| posted on 29/10/15 at 11:50 AM |
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But its raining ouside  ............Fine.... 
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JamesyCottony
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| posted on 29/10/15 at 11:58 AM |
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The two pipes shown in the middle here:
number 2&3 on this page:
http://www.minimania.com/SU_CARBS___Connection__HIF_type
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jacko
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| posted on 29/10/15 at 12:16 PM |
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twin SU carbs/1
http://www.britishcarforum.com/bcf/showthread.php?45618-HIF44-Carb-Questons-need-some-information
[Edited on 29/10/15 by jacko]
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JamesyCottony
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| posted on 29/10/15 at 12:53 PM |
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quote:
Originally posted by jacko
twin SU carbs/1
http://www.britishcarforum.com/bcf/showthread.php?45618-HIF44-Carb-Questons-need-some-information
[Edited on 29/10/15 by jacko]
So plug the one on the right and run the one on the left under the car?
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r1_pete
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| posted on 29/10/15 at 12:58 PM |
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This might help:
 
hif44
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DIY Si
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| posted on 30/10/15 at 07:03 PM |
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Basically, they're fine as they are.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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jacko
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| posted on 31/10/15 at 11:46 AM |
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you need a pipe of the float vent going down under the car if fuel comes out this pipe you don't want it spraying on the exhaust / manifold 
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JamesyCottony
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| posted on 1/4/16 at 09:46 AM |
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quote:
Originally posted by jacko
you need a pipe of the float vent going down under the car if fuel comes out this pipe you don't want it spraying on the exhaust / manifold
Which one is the float vent pipe?
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jacko
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| posted on 1/4/16 at 02:40 PM |
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hif44
Number 7 on this picture
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gremlin1234
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| posted on 1/4/16 at 03:33 PM |
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you also appear to have a vacuum advance take off, 'A' in pic below. (also 9, not shown on the other pics)
 
Description
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JamesyCottony
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| posted on 1/4/16 at 06:04 PM |
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quote:
Originally posted by gremlin1234
you also appear to have a vacuum advance take off, 'A' in pic below. (also 9, not shown on the other pics)
Description
Do I have to do anything with this?
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02GF74
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| posted on 1/4/16 at 06:08 PM |
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SU carbs as im sure you know.
Large diameter is breather and connects to engine .
Smaller is float chamber vent, if the needle valve fails to close, as can happen if left standing for a while, petrol will wee out of it. Connect
pipe to it and route it so that the outlet is away from any heat or electrical sources to avoid fire. THIS IS V IMPORTANT for safety reasons.
As someone pointed out, there is vacuuuuuuuuum take off to distributor advance. Connect it or if distributor does not have vacuuuum advance, block it
off.
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JamesyCottony
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| posted on 1/4/16 at 06:29 PM |
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quote:
Originally posted by 02GF74
SU carbs as im sure you know.
Large diameter is breather and connects to engine .
Smaller is float chamber vent, if the needle valve fails to close, as can happen if left standing for a while, petrol will wee out of it. Connect
pipe to it and route it so that the outlet is away from any heat or electrical sources to avoid fire. THIS IS V IMPORTANT for safety reasons.
As someone pointed out, there is vacuuuuuuuuum take off to distributor advance. Connect it or if distributor does not have vacuuuum advance, block it
off.
Thanks for the replies everyone  .
With the breather would it connect to a small little flying saucer shape thing by the alternator?
With the distributor advance vacuum pipe should there be a small pipe in the distributer that this would connect to?
Thanks again
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jacko
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| posted on 1/4/16 at 07:48 PM |
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quote:
Originally posted by JamesyCottony
quote:
Originally posted by 02GF74
SU carbs as im sure you know.
Large diameter is breather and connects to engine .
Smaller is float chamber vent, if the needle valve fails to close, as can happen if left standing for a while, petrol will wee out of it. Connect
pipe to it and route it so that the outlet is away from any heat or electrical sources to avoid fire. THIS IS V IMPORTANT for safety reasons.
As someone pointed out, there is vacuuuuuuuuum take off to distributor advance. Connect it or if distributor does not have vacuuuum advance, block it
off.
Thanks for the replies everyone .
With the breather would it connect to a small little flying saucer shape thing by the alternator?
With the distributor advance vacuum pipe should there be a small pipe in the distributer that this would connect to?
Thanks again
On some cars the dizzy has a small pipe for the vacuum if you don't have this on your dizzy just block the one on the carb off
the breather pipe would normally go to the air filter box but in your case feed it under the car if you are going for a iva it will have to go to the
air filter box
jacko
[Edited on 1/4/16 by jacko]
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02GF74
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| posted on 1/4/16 at 09:33 PM |
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Breather is to burn off blow-by gas , usually it connects to the top part of the engine e.g. rocker cover. Combustion gas gets past rings and
pressurises crankcase, on ohv engine it get into top via holes for push rods.
Good explanation why you want to do this is here.
http://www.bobistheoilguy.com/what-is-blow-by/
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JamesyCottony
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| posted on 2/4/16 at 06:42 AM |
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quote:
Originally posted by jacko
quote:
Originally posted by JamesyCottony
quote:
Originally posted by 02GF74
SU carbs as im sure you know.
Large diameter is breather and connects to engine .
Smaller is float chamber vent, if the needle valve fails to close, as can happen if left standing for a while, petrol will wee out of it. Connect
pipe to it and route it so that the outlet is away from any heat or electrical sources to avoid fire. THIS IS V IMPORTANT for safety reasons.
As someone pointed out, there is vacuuuuuuuuum take off to distributor advance. Connect it or if distributor does not have vacuuuum advance, block it
off.
Thanks for the replies everyone .
With the breather would it connect to a small little flying saucer shape thing by the alternator?
With the distributor advance vacuum pipe should there be a small pipe in the distributer that this would connect to?
Thanks again
On some cars the dizzy has a small pipe for the vacuum if you don't have this on your dizzy just block the one on the carb off
the breather pipe would normally go to the air filter box but in your case feed it under the car if you are going for a iva it will have to go to the
air filter box
jacko
[Edited on 1/4/16 by jacko]
I don't have an air filter box
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JamesyCottony
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| posted on 2/4/16 at 07:03 AM |
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quote:
Originally posted by 02GF74
Breather is to burn off blow-by gas , usually it connects to the top part of the engine e.g. rocker cover. Combustion gas gets past rings and
pressurises crankcase, on ohv engine it get into top via holes for push rods.
Good explanation why you want to do this is here.
http://www.bobistheoilguy.com/what-is-blow-by/
I can't find and pipes on the rocker cover??
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02GF74
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| posted on 2/4/16 at 07:18 AM |
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Dont think you said what engine you have but i deduce a series. It may have crankcase breather, see here.
http://appraisalnewsonline.typepad.com/our_mini/2012/12/classic-mini-engine-bay-crankcase-breather.html
Re distributor vacuum advance connector
See here.
http://www.pertronix.com/prod/new/details.aspx?id=122
Disc on left hand side is it, the small pipe is connected to the carb. You need special hose, it is firm plastic so does not collapse under vacuum
and has two rubber connectors at each end.
[Edited on 2/4/16 by 02GF74]
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JamesyCottony
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| posted on 2/4/16 at 07:22 AM |
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quote:
Originally posted by 02GF74
Dont think you said what engine you have but i deduce a series. It may have crankcase breather, see here.
http://appraisalnewsonline.typepad.com/our_mini/2012/12/classic-mini-engine-bay-crankcase-breather.html
Re distributor vacuum advance connector
See here.
http://www.pertronix.com/prod/new/details.aspx?id=122
Disc on left hand side is it, the small pipe is connected to the carb. You need special hose, it is firm plastic so does not collapse under vacuum
and has two rubber connectors at each end.
[Edited on 2/4/16 by 02GF74]
This is so much help thankyou!!
With the distributer pipe can I just use non collapsible rubber?
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JamesyCottony
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| posted on 2/4/16 at 07:26 AM |
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Would this be the crankcase breather?
IMAGE
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gremlin1234
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| posted on 2/4/16 at 10:26 AM |
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quote:
With the distributer pipe can I just use non collapsible rubber?
this should fit, from minispares. should be easily available elsewhere
too
http://minispares.com/product/Classic/Engine/37H4229M.aspx
[Edited on 2/4/16 by gremlin1234]
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JamesyCottony
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| posted on 2/4/16 at 10:29 AM |
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quote:
Originally posted by gremlin1234
quote:
With the distributer pipe can I just use non collapsible rubber?
this should fit, from minispares. should be easily available elsewhere
too
http://minispares.com/product/Classic/Engine/37H4229M.aspx
[Edited on 2/4/16 by gremlin1234]
Thankyou for that
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02GF74
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| posted on 2/4/16 at 12:10 PM |
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quote:
Originally posted by JamesyCottony
Would this be the crankcase breather?
IMAGE
You need someone who knoes bout a series engines minis etc to answer that.
It is a breather but judging how clean it is, it could be new or inlet. For example on rover v8, there is inlet to crank case, air drawn in and two
outlets on both rocker covers.
If what you show is outlet, it soon will be clogged and dripping with oil. You would be better off connecting hose and feed into oil catch tank,
simple and cheap is old beer can. Search for oil catch tank here to see solutions.
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