4
« on: 12 March, 2024, 19:46:46 »
I currently have the primary chaincase off my B32 and have been looking at the rather crappy breather valve. It's the same as fitted to the timing cover of the later bikes but is fitted to the main bearing housing instead. It has the same little fibre disc clack valve in it which really doesn't seem to work very well. I intend to fit a check valve in the hose downstream of it so that a partial vacuum is created in the engine. But I'm additionally considering two other options.
1. Fit an addition breather to the inlet rocker cover using the same check valve in the same direction, to allow air out but not in creating a vacuum internally,
2. Fit an addition breather to the inlet rocker cover using the same check valve in the opposite direction. This will allow air to travel into the top of the engine and get pumped out the bottom breather taking fumes and condensation with it. As long as the inlet is restricted it should create a partial vacuum in the engine helping to reduce oil leaks but given the location of the bottom breaker it might also carry a lot of oil with it. If it doesn't work I can just reverse the check vale in addition top breather.
These are the valves I'm using.