Crankcase breather & disconnected air boxes.
Posted: Sat Jun 15, 2019 12:07 pm
I’m in a right old dither on understanding the crankcase breather setup as I'm planning to junk the air boxes & put pods on the (40mm) carbs. The reason behind this isn’t just bling because I’m wanting plenty of space for a re-wire, new regulator & ignition.
From what I’ve read the factory solutions for such a setup came with bellows (750ss) or a catch tank (MHR) and both using an exit flapper valve.
I can understand the valve stopping the crankcase drawing in dirt etc but does it also have another, perhaps more important, effect on the crankcase pressure And I also understand the catch tank collects any oil but, again, does it's capacity have any effect on the crankcase pressure And when using the airbox I'm assuming there's a natural tendency for the crankcase pressure relief to be assisted by the induction. Again this will also be lost, thrice
I’m planning on doing the usual, keeping the tower and putting a vent filter on the end of the tube with perhaps a spring inside but will the lack of any pressure ‘control’ have an unwelcome effect on the crankcase pressure?
Andy B
From what I’ve read the factory solutions for such a setup came with bellows (750ss) or a catch tank (MHR) and both using an exit flapper valve.
I can understand the valve stopping the crankcase drawing in dirt etc but does it also have another, perhaps more important, effect on the crankcase pressure And I also understand the catch tank collects any oil but, again, does it's capacity have any effect on the crankcase pressure And when using the airbox I'm assuming there's a natural tendency for the crankcase pressure relief to be assisted by the induction. Again this will also be lost, thrice
I’m planning on doing the usual, keeping the tower and putting a vent filter on the end of the tube with perhaps a spring inside but will the lack of any pressure ‘control’ have an unwelcome effect on the crankcase pressure?
Andy B