Labyrinth wanted.

Labyrinth wanted.

Postby buzby » 24 Oct 2019 15:33

Can somebody please help me , I need a labyrinth, that's the plastic baffle that goes in the crankcase breather pipe. Mdina have none.

thank you,
Dave.
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Re: Labyrinth wanted.

Postby norbert » 24 Oct 2019 16:41

If you don´t find them nearer, I should have a pair of them anywhere. Normaly there are two labyrinth in the tube, but Rocinante wears only one for years in a Gardena-garden-tube without any problem :wink:

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Re: Labyrinth wanted.

Postby Steve Brown » 24 Oct 2019 18:01

As Norbert says, one will be fine. My own bike was supplied new in 1977 (76 model-correct shade of red) and works fine still.

For my Camel build I couldn't find one and used a non return valve intended for diesel fuel systems. That works fine too. Available from motor parts factors everywhere for a few quid.
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Re: Labyrinth wanted.

Postby harrymuffin » 24 Oct 2019 18:31

Unfortunately I have just sold two. If you should get really desperate then I can knock you a couple out, I have aluminium ones in my pipes. but plastic would be just as easy.
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Re: Labyrinth wanted.

Postby buzby » 24 Oct 2019 19:29

Thanks everybody. I read somewhere, possibly on here, that they cause the necessary back pressure so that oil reaches the cylinder heads.
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Re: Labyrinth wanted.

Postby Daddy Dom » 25 Oct 2019 05:20

A job for someone with a 3D printer, I reckon.
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Re: Labyrinth wanted.

Postby Ming » 25 Oct 2019 06:40

Stainless scouring pad?
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Re: Labyrinth wanted.

Postby Steve Brown » 25 Oct 2019 17:55

buzby wrote:Thanks everybody. I read somewhere, possibly on here, that they cause the necessary back pressure so that oil reaches the cylinder heads.

The effect is more like a one way valve, hence why my mod works, it isn't a new idea and they get used to control the crankcase breathing on many classic car and bike engines very effectively. If you bung it up with something like wire wool! :? you will create positive pressure in the crankcase, lose perfomance and gain a lot of oil leaks. Then you can really call it a proper classic! :wink:

3D printer is a good idea though!
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Re: Labyrinth wanted.

Postby Steve Brown » 25 Oct 2019 17:57

Ming wrote:Stainless scouring pad?


!!! Noooo!!!
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Re: Labyrinth wanted.

Postby buzby » 28 Nov 2019 16:05

I ended up using the one way valve for car or bike engines as recommended by Steve. It fits inside the breather pipe, it's cheap, you can't see it and it works. Thanks everybody for the advise.
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Re: Labyrinth wanted.

Postby simonnorthroad » 03 Dec 2019 11:24

where did you get it from? Im interested in one
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Re: Labyrinth wanted.

Postby buzby » 03 Dec 2019 19:06

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Re: Labyrinth wanted.

Postby George 350 » 03 Dec 2019 23:52

Surely you want oil mist to go 'upstairs' to the rockers? If you put a non-return valve on the crankcase breather, then every time the pistons go up you will be sucking air into the rocker covers due to there now being a vacuum in the crankcase and any oil mist will come down with it.
(Any blowby past the rings shouldn't be any where near enough to fill the vacuum unless your engine is really shagged).
I remain of the opinion that the crankcase breather needs to have a controlled 2-way flow, so that the road draught under the engine can draw oil mist up to the top end.
98000 miles on original rockers suggests that the original design works.
Regards, George.
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Re: Labyrinth wanted.

Postby Ming » 04 Dec 2019 08:17

For what it's worth - I have always thought that the labyrinth in the crankcase breather was no restriction to air, but was simply something for any oil mist to condense on and fall back into the engine. ie the crankcase would be always at atmospheric pressure. Am I wrong?
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Re: Labyrinth wanted.

Postby Zed1 » 04 Dec 2019 21:20

Should all models have these ? I've a Excalibur and when I swapped the breather tube it was just a empty tube ,if needed would 1 of the non-return valves be ok thanks Paul
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