Another home made catch can

[tome30]

The air filter on the golf is saturated in oil, because of the breather pipe that sends excess oil to be burnt with the fuel in the carb. I think this might be part of the problem but until then I making a catch can, mainly because I want to, not because I feel it'll actually do something.

Got an aluminium bike water bottle and some fittings, still waiting on pipe, but should cost around £10 when I'm finished.

[Robinxr4i]

Looks good I picked up one of these for the same reason (although being lazy I've yet to actually make it!)

BTW To Air filter/carb To atmosphere

[tome30]

Sept 23, 2011 15:17:23 GMT Robinxr4i said:

BTW To Air filter/carb To atmosphere

Did concider it.

[Deleted]

That's a pretty good idea. I wish I'd thought of it before I threw my old bottle away...

[PandaSelecta]

Sept 23, 2011 15:41:32 GMT Jonny69 said:

That's a pretty good idea. I wish I'd thought of it before I threw my old bottle away...

You could say you lost your bottle


(i'll get my coat)

[jrevillug]

Nice idea - I might just nick that one.

My lazy cheapo version is a squash bottle with two lengths of garden hose stuck in the top - one from the crankcase and one to the carb. Most of the fumes end up in the carb.

[93fxdl]

like the idea, but a couple of ideas to reduce the fuming
have you got the correct filler cap
are any other breathers blocked
as in the past i have had problems like yours and blocked vents etc caused the problem
ttfn glenn

[mudbitz123]

bottles in satin alloy or black are in poundland
bought one few weeks ago with same intention
good call

[BenzBoy]

Ingenious! I love seeing things adapted like this - may have to pick up a few next time I'm passing Pondland.

[Lewis]

Genius.

[tome30]

Fitted it today, I'll get some pictures up, looks alright!
Doesn't appear to have stopped the blue smoke under acceleration, but I'll check the new air filter fitted today in a couple of weeks to see if theres any less 'oiling'

[chairchild]

a catch-can doesn't remove virtually ANY oil vapour from the crankcase fumes..... You'd need a far far greater surface area, with cooling (alloy case, with airflow over it, etc) to remove even 20% of the oilly vapours



Catch-cans do look pretty mind you

[tome30]

93fxdl : I do have the correct cap and no other breathers seem blocked, but thanks for the suggestion.
Chairchild : I agree, I don't actually think it'll do anything.

[gumpspeed]

sure its not valve stem seals ?

[RetroWarwicK]

oil vapour/fumes affects octane rating too. i fitted a diy catch can on my golf mk4 turbo. stopped the intercooler sludging up too

[tome30]

Sept 26, 2011 8:53:09 GMT gumpspeed said:

sure its not valve stem seals ?

I've been told this many times, but have absolutly no idea what to do about it, or how much it'd cost?

A friend explained they (Stem Seals) wipe excess oil from the pistons?? and if they're shot then the oil gets through and is burnt?? Sounds wrong.

[VIP]

Stem seals are a relatively simple job. It's simply the seals around the inlet/exhaust valves which prevent oil in the head from getting into the combustion chamber. When they wear, they allow oil from the head to get burnt along with the fuel, hence the blue smoke.

It's a case of whipping the head off, pulling the valves and renewing the seals.

However, I believe that stem seals usually show up as blue smoke upon starting, and on overrun, rather than on accelaration.

Blue smoke on accelaration is either excess oil into the carb breather, or -more seriously- piston ring wear. It could also be a head gasket failure where the fail is between an oilway and a cylinder.

[tome30]

Sept 26, 2011 10:13:22 GMT VIP said:

However, I believe that stem seals usually show up as blue smoke upon starting, and on overrun, rather than on accelaration.

Actually what I discribed as acceleration, would be from a stop. Its everytime I pull away from lights for instance, or if I rev the engine, on the down revs the smoke pops out. So sounds like stem seals then.

I'm gonna google the procedure....Thanks.

[tome30]

And there you go, if anyone was interested.