madass140 said:well I've done the Old Britts mod already,...
illf8ed said:The stock '72 condition before the Old Britts mod has the potential to suck metal bits into the oil pump gears. That's the condition mine was in when I bought it before doing the oil pick up and breather mod.batrider said:Some feel the Old Britts mod to the Combat crankcase is butchery. Controversial. There is a danger that circulating chunks of metal could get sucked up right into the oil pump gears.
madass140 said:ok, I'll stop caling my project a restoration , its just another butchered rebuild, I can sleep easy now.
ZFD said:It might pay if you made yourself familiar with the breathing on late 850s ...
Tintin said:The big advantage of the Jim/CNW version is the fact that it doesn't abuse those tiny holes connecting the timing case and the crankcase for breathing.
grandpaul said:The "tiny holes" connecting the crankcase & timing chest are ample in cross sectional free area.
Tintin said:No, they aren't - and that's why I consider Jim's crankcase mounted Reed valve to be superior.
grandpaul said:My understanding is that once the engine is revving, a GOOD reed valve, no matter where it's placed, will allow the crankcase pressure to remain relatively neutral and doesn't require a great amount of cross-sectional free area along it's path. The size of the exit hose may actually be the limiting factor at any speeds in the power band.
The "tiny holes" connecting the crankcase & timing chest are ample in cross sectional free area.
bill said:once again
grandpaul said:Pretty darned good proof, yet some people just won't take "yes" for an answer.
Tintin said:Did it ever occur to you that if something works well there might still be something that works better? And did you ever come across the saying that better is the enemy of good? To me that is one of the fundamental failures of "pragmatist" trying to bash "theorisers".
Tintin said:And did you ever come across the saying that better is the enemy of good?