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Crankcase vent/vacuum/PCV? (Read 447 times)
Ruttly
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Re: Crankcase vent/vacuum/PCV?
Reply #30 - 08/12/16 at 10:15:02
 
I am in full agreement with Armin , I just don't believe the gain is worth the hassle for a 33 h/p engine,better off cutting weight & doing engine mods !
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Armen
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Re: Crankcase vent/vacuum/PCV?
Reply #31 - 08/12/16 at 11:47:52
 
It's really not much hassle. And precisely because the bike is so gutless that you have to look for ways to make it better. And I think 33HP was measured at the ad brochure, not at the rear wheel  Wink
No one says you have to do anything. I'm just trying to share what little I know.
In the old days, when someone would come to the shop and complain that their bike wasn't fast enough, I'd put them on the back seat, take it out and redline it in all gears. Then I'd ask "At what point was the bike to slow?"
Usually the person was scared half to death by that point and never mentioned how slow the bike was ever again.
With these bikes, it's a different story. They are legitimately slow.
All the bikes with the over-stretched cam chains are running cam timing so retarded the valves should be traveling in a little yellow school bus.
Nice to be figuring out how to make the bikes a bit snappier. Preferably without major work and bucks.
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Ruttly
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Re: Crankcase vent/vacuum/PCV?
Reply #32 - 08/12/16 at 12:09:55
 
I'll buy that , I threw some cash at mine it is no longer slow. Far from slow almost a little scary when held wot and going thru the gears. No math just saw what it needed & built it ! If you were in CA  might let you take it for a blast , even handles pretty damm nice ! I'm still impressed of what I built !
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Armen
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Re: Crankcase vent/vacuum/PCV?
Reply #33 - 08/12/16 at 13:22:38
 
Thanks Ruttly!
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Ruttly
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Re: Crankcase vent/vacuum/PCV?
Reply #34 - 08/12/16 at 15:08:07
 
Ya know the oil fill plug would be ideal to modify to draw that vaccuum on crankcase and still have a breather off the top of the engine. I bought a aftermarket plug on eBay it would be easier to modify than stock plug !
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Ruttly
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Re: Crankcase vent/vacuum/PCV?
Reply #35 - 08/12/16 at 15:14:55
 
Aren't you the one who lightened the flywheel?
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Re: Crankcase vent/vacuum/PCV?
Reply #36 - 08/12/16 at 17:17:52
 
'Aren't you the one who lightened the flywheel?'

Yup.



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Ruttly
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Re: Crankcase vent/vacuum/PCV?
Reply #37 - 08/12/16 at 18:55:52
 
Got it running yet ?
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Ruttly
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Re: Crankcase vent/vacuum/PCV?
Reply #38 - 08/12/16 at 19:31:38
 
Wish I could have that done. You definitely have the skills & knowledge , me I'm just a hobbiest , learn from past mistakes and from picking the brains of people like yourself.
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Ruttly
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Re: Crankcase vent/vacuum/PCV?
Reply #39 - 08/12/16 at 20:30:04
 
So now you got me curious. Exactly how are you going to do it on your bike,details please !
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Armen
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Re: Crankcase vent/vacuum/PCV?
Reply #40 - 08/13/16 at 04:28:51
 
The plan is to run a power brake one way valve off the cylinder head vent hose into a K+N crank filter.
Then use either the Ducati crankcase vent valve or make a housing for a BMW Airhead crankcase reed valve and mount that onto the hole from the speedo drive. Also with a K+N crank filter on the end.
If the filters are consistently getting wet with engine oil, I'll plug the lines into a catch can full of brass wool, then run a K+N crank filter on the outlet side of that.
The goal is to have it work and not look like a plumber's nightmare  Wink
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Re: Crankcase vent/vacuum/PCV?
Reply #41 - 08/13/16 at 06:56:41
 
If your running a chain conversion you could skip the catch can and run a hose just above counter sprocket as a chain oiler ! Was looking at electric vacuum pumps but their noisy and not sure they have that volume to keep up with such a big piston(97mm)
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Re: Crankcase vent/vacuum/PCV?
Reply #42 - 08/13/16 at 07:10:18
 
Wow... That's interesting.
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Armen
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Re: Crankcase vent/vacuum/PCV?
Reply #43 - 08/13/16 at 08:32:39
 
Ruttly,
Not running a chain. Want to keep the belt. Never liked the automatic oilers. Had one (stock) on my '75 Norton.
FWIW, If you dump the oil on the top of the chain, you are oiling the outside of the chain, which means it just flies off.
I'll draw a diagram of the vacuum system we had on the racer. For me, an electric pump would be too much 'stuff'.
-Armen
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Ruttly
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Re: Crankcase vent/vacuum/PCV?
Reply #44 - 08/13/16 at 20:38:24
 
Looking forward to seeing the diagram , see if it's close to what I came up with.
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