Steel hose in oil cap, thoughts?

[1948man]

It sprays out but not a deluge. Just enough to be a nuisance, and of course a danger to engine longevity if it goes on long enough.

a little louder too.

 

[gs11ezrydr]

Thinking about this, how do you measure to a figure like negative 3br? I understood that once a vacuum is achieved that's it there would be nothing left to measure and that would be zero.
I imagine that the rings suffer because the vacuum lowers the boiling temperature point so that the efficiency of the oil is changed massively, rings rely on mist to lubricate and a vacuum would surely affect that especially in a hot engine?
Just asking, not challenging.
The ring flutter is interesting

I have installed several Wiseco kits and they recommend different end gaps for the 1st top ring and the 2nd ring they say is causes less ring flutter....004 per inch of bore top .005 per inch of bore 2nd ring I have seen race motors that were the pistons were ported causing almost total seal but excessive ring wear.The compression forced the rings against the cylinder walls through the small ports (holes)..All the vacuum pumps I have seen were on mainly Pro Stockers, Pro Mods.. I have mainly seen your set up with the oil cap breathing also but only in like funny bike.Some Pro Mod.But no advantage on a stock bore motor..Sounds like the motor had excessive blow by and this might have been a temp. fix..Never know ...

 

[gs11ezrydr]

I've been advised that the big bore kit (1100 cc high compression Wiseco pistons) may be causing the gaskets on my GS1000 engine to not seal correctly due to higher than stock crankcase pressures. I've been blowing gaskets & seals left and right since getting the bike back on the road after a number of years in storage, leading to oil leaks. The stock breather may be inadequate for this application.


So, one of these clutch cover mounted crankcase breathers is now on its way. Now need to source and mount an oil catch can....or maybe just put a filter on the end of the braided hose. We'll see.

I went as far as replacing pistons and rings on a 1000 that kept pushing out the rubber cam plugs and valve cover gaskets..Still did it...I finally attached a K&N filter to the breather hose off the valve cover.Improved it dramatically.

 

[bitzz]

... I have seen race motors that were the pistons were ported causing almost total seal but excessive ring wear.The compression forced the rings against the cylinder walls through the small ports (holes)..All the vacuum pumps I have seen were on mainly Pro Stockers, Pro Mods.. I have mainly seen your set up with the oil cap breathing also but only in like funny bike.Some Pro Mod.But no advantage on a stock bore motor..Sounds like the motor had excessive blow by and this might have been a temp. fix..Never know ...

You are describing "gas ported pistons", found on many modern motors.
Total Seal now make "ported rings"
https://www.youtube.com/watch?v=oYQ9jOkm3_k&feature=youtu.be