The BSA A7-A10 Forum

Technical (topic titles must be descriptive) => A7 & A10 Engine => Topic started by: BSAA10 on 28.01. 2016 07:17

Title: Breather...again!
Post by: BSAA10 on 28.01. 2016 07:17
Hello  Do you guys take your chaincase breather to the rear mudguard, to the ground, or to a container bottle? I have aa 1960 A10 Rocket Goldstar Thanks
Title: Re: Breather...again!
Post by: terryg on 28.01. 2016 07:51
Chaincase breather? Do you mean the outlet from the primary chaincase end of the cam tunnel?  Which is the main engine breather outlet that drops oil onto the secondary chain.

If so, none of my engines has the spigot tube in place so there's nothing to connect a drain pipe to.
Title: Re: Breather...again!
Post by: Rocket Racer on 28.01. 2016 08:37
I've tapped mine on both my A10 engines so I can run breathers (currently only fitted to the race engine) and I run Bunn breathers so this is only an intake through a filter in a plastic bottle (bottle required for scruitineering). I exit methanol polluted air out of the rocker box to another catch bottle .

On a road engine I probably wouldnt bother with fitting a breather hose.
On my beesa preunit single I run my breather (copper line) into the back of the oil tank.
Title: Re: Breather...again!
Post by: Greybeard on 28.01. 2016 09:27
On my plunger engine there is a pressure relief pipe in the oil tank that is routed down to the gearbox sprocket I'm not aware of another breather on the engine.
Title: Re: Breather...again!
Post by: BSA_54A10 on 28.01. 2016 22:25
The engine has a breather.
It comes out just in front of the secondary drive sprocket.
The crankcase has an oiler.
It comes out of a banjo on the back end of the primary chaincase

Which one are you talking about.
Title: Re: Breather...again!
Post by: scotty on 28.01. 2016 22:38
Here's a pic of the crankcase breather exit port

Some have the spigot some do not



Title: Re: Breather...again!
Post by: chaterlea25 on 28.01. 2016 22:40
Hi,
Quote
I have aa 1960 A10 Rocket Goldstar Thanks

To the best of my knowledge and info RGS models were introduced for the 1962 model year

http://www.britbike.com/bsapitstop/dating/post1960.html

??
John
Title: Re: Breather...again!
Post by: BSAA10 on 07.02. 2016 06:09
Yes I know sorry its a  replica and I did mean crankcase! I'll just direct it to the ground. Thanks
Title: Re: Breather...again!
Post by: Rocket Racer on 15.02. 2016 05:03
as someones gone to the trouble of fitting a spigot, I'd be tempted to run a hose off it over the top of the chain guard so you can see if anything comes out  *dunno*. But I've never seen one with a spigot so believe this is a mod.
For race motors all orifices must typically be plumbed to breather bottles
Title: Re: Breather...again!
Post by: magicflem on 16.02. 2016 00:28
I wouldn't bother with spigots and pipes.
If your oil pump is in good order and you drain sump after extended storage nothing should exist from this orifice.