11 replies to this topic

[ace]

o.k quick one - is this correct - I have two k and n breathers on my oil crankcase breathers - so thats sorted - so on the carb should I block the CRANKCASE BREATHER PIPE CONNECTION - if so WHY and WHAT to block with ?!?!?!

pic attached to explain the below

1 - FUEL INLET PORT
2 - FLOAT CHAMBER OVERFLOW/BREATER
3 - CRANKCASE BREATHER PIPE CONNECTION
4 - FUEL MIXTURE ADJUSTMENT


thanks all

Ross

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[Bungle]

block

if you don't block the pipe on the carb it will suck air in through it and weaken your mixture

[THE ANORAK]

we went through a very similar question here just the other day.

the general opinion was to connect it up in the "proper way that it was designed to work"

[Ethel]

Yes you must, but in a minute someone will be along to tell you to get attached back to the crankcase breathers.

A short length of hose with a bit of rod or a suitably sized bolt stuck in the end will do. If you don't block it you'll have a bad air leak which will ruin your idle and possibly allow dirt in to ruin the engine as well.

[ace]

just read all the posts - as I have brought 2 k and N breather filters I think I will put them on and block the pipe on the carb - Any suggestions what to block with!!!

thanks
Ross

[Bungle]

A short length of hose with a bit of rod or a suitably sized bolt stuck in the end will do.

[ace]

Yes you must, but in a minute someone will be along to tell you to get attached back to the crankcase breathers.

A short length of hose with a bit of rod or a suitably sized bolt stuck in the end will do. If you don't block it you'll have a bad air leak which will ruin your idle and possibly allow dirt in to ruin the engine as well.

that's why my idle might be a bit popopo (thats the sound it makes )

will do it tonight!!

[stardude]

some people use a bolt in a bit of pipe, with one of those metal hose clamps aswell

[imabitnaughtyxx]

just a quick hijack, you know the fuel breather (do not block) i have a length of vac hose on this but nothing on the end its just, open ended. should i put something on the end like a filter or will it be ok
PS in the original metro the original pipe went into the servo i think, but i dont have one on my mini

[Dan]

The breather hosing and vacuum servo hosing are different and seperate systems, they should not be connected together.

Vacuum hose may proove to not be fuel resistant and may break down, it also is fairly narrow bore if you're using what I'm thinking of and won't allow fuel to flow as fast as it should if any wants to escape from the float chamber. Essentially this will be the same as blocking it up and will prevent the overflow from functioning, flooding the jet if there is a problem with the float. What is original is a length of steel fuel line running around the outside of the clutch cover from the carb down to the bottom of the gearbox and terminating at subframe level pointing into the road. It is connected to the overflow by a short fuel hose. You shold aim for something like that using copper. It doesn't need to end in anything special, it's just an overflow and in theory will never be used. If you use plastic or rubber for the whole length you will need to protect it from the heat of the exhaust so you may as well use a metal section.

[cowboy]

just a quick hijack, you know the fuel breather (do not block) i have a length of vac hose on this but nothing on the end its just, open ended. should i put something on the end like a filter or will it be ok ( yes this will be OK)
PS in the original metro the original pipe went into the servo i think, but i dont have one on my mini

[imabitnaughtyxx]

The breather hosing and vacuum servo hosing are different and seperate systems, they should not be connected together.

Vacuum hose may proove to not be fuel resistant and may break down, it also is fairly narrow bore if you're using what I'm thinking of and won't allow fuel to flow as fast as it should if any wants to escape from the float chamber. Essentially this will be the same as blocking it up and will prevent the overflow from functioning, flooding the jet if there is a problem with the float. What is original is a length of steel fuel line running around the outside of the clutch cover from the carb down to the bottom of the gearbox and terminating at subframe level pointing into the road. It is connected to the overflow by a short fuel hose. You shold aim for something like that using copper. It doesn't need to end in anything special, it's just an overflow and in theory will never be used. If you use plastic or rubber for the whole length you will need to protect it from the heat of the exhaust so you may as well use a metal section.

hmm as i said though i dont actually have a servo on the mini so theres nothing coming off the fuel breather anyway. I have used 180 degree temp silicone vacuum hosing on the crankbreather pipes as well, this was recommened to me by a forum member, are you telling me this cannot be used for the breather system at all? im confused