The BSA A7-A10 Forum

Technical (topic titles must be descriptive) => A7 & A10 Engine => Topic started by: BSAA10 on 07.02. 2016 05:55

Title: Breather?
Post by: BSAA10 on 07.02. 2016 05:55
What is the tube coming from the top of the engine? some sort of breather? Should it be filtered?
Title: Re: Breather?
Post by: trevinoz on 07.02. 2016 21:06
Which tube would that be?
Title: Re: Breather?
Post by: bsa-bill on 07.02. 2016 21:12
only tube I can think of is the oil feed to the rockers  definitely not a breather
Title: Re: Breather?
Post by: Rocket Racer on 07.02. 2016 22:47
The webco rocker box covers typically include a breather fitting. My exhaust side standard cover has been modified to be my outlet breather so does go to a breather bottle and runs via a Bunn oneway valve (out only).
But as standard A10's just have the one timed breather on the drive side behind the cam as previously pictured in this thread.
So any further breathers would be non standard mods for the go-fast brigade
Title: Re: Breather?
Post by: BSAA10 on 08.02. 2016 00:06
Yes it appears to be a fitting with length of hose from the rear rocker cover. Should the hose go to any particular place? This is a standard A10 Super Rocket. Thanks
Title: Re: Breather?
Post by: bsa-bill on 08.02. 2016 09:34
yes rocker breather - I've always wondered why, if there's excess pressure up there it's surely coming from somewhere it shouldn't or am I missing something?
Title: Re: Breather?
Post by: chaterlea25 on 08.02. 2016 12:57
Hi All,
THe original timed breather is designed to create a partial vacuum within the engine cases
Adding another open breather does away with the vacuum effect
as Bill says
Quote
if there's excess pressure up there it's surely coming from somewhere it shouldn't

The standard breather works very well once correctly set up

all the breathers in existance wont make up for engine problems

John