Mikes PCV Valve
- Thread starter chasesa
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chasesa said:
Picture of how you have it installed please.
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Maybe you have the thing reversed ? It is clearly marked in or outflow direction. Photo ?
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+ 2 with Torontonian Stephen !!! My 750 leaked from EVERY joint before I installed the mikesxs "reed type" PCV valve, and that was after a complete meticulous rebuild ! I was so discouraged I let the bike just sit ... for several months. 
Think I found out about the valve on this very forum ... or was it the INOA tech digest ? :? I can't recommend it enough, as it worked a treat for me 
Think I found out about the valve on this very forum ... or was it the INOA tech digest ? :? I can't recommend it enough, as it worked a treat for me 
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chasesa said:
Hmm, it should work like that. What happens with a reed valve (as opposed to a floppy PCV valve) is that one the crankcase gets closer to a balanced pressure it doesn't have to work as hard. Only on start up will you notice anything.
I think it's working normally.
N
nortonspeed
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nortriubuell said:
Take my advice get some else to rebuild your engine next time, if it is done properly you would not need this valve in the first place :wink:
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nortonspeed said:
Debatable. British bikes leaked for two reasons, poor breathing and questionable tolerances.
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Agree. My old mate John Hudson spent his life fixing them for Norton. He/I rebuilt my old Commando several times. It still suffered soft cams and oil leaks and he certainly knew what he was doing. If they were so easy to get right then they would probably still be making them; the power delivery and whole package is fantastic when they are going...but
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swooshdave said:
+1
N
nortonspeed
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Apparently all of us know for sure they are good mechanics. Make an educated guess do you think a Reborn Commando (Colorado Norton Works) or a Perfect Commando (Holland Norton Works) will 'leak from every joint' 
N
nortonspeed
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Apparently all of us know for sure they are good mechanics. Make an educated guess do you think a Reborn Commando (Colorado Norton Works) or a Perfect Commando (Holland Norton Works) will 'leak from every joint'
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nortonspeed said:Apparently all of us know for sure they are good mechanics. Make an educated guess do you think a Reborn Commando (Colorado Norton Works) or a Perfect Commando (Holland Norton Works) will 'leak from every joint'
At least CNW puts a really good breather on each engine. I assume HNW does too. What's your point?
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swooshdave said:
Sorry Dave, but if you put them together right they don't leak or need a breather valve.
I've had a lot of scavenging problems with my old 850 since fitting the very efficient mikrsxs breather, since removal no more problems or leaks. I am however, thinking of drilling that small return hole that you drilled in your valve (I think it was you :? } to reduce its efficiency and might refit it.
Cash
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cash said:
Your bike appears to be the exception. Which leads us to think there might be something else going on with your bike.
As for not needing a breather has been discounted by some very intelligent people over the years (obviously I'm not on that list).
The return hole does not reduce the efficiency at all. It merely allows the oil to drain back to the sump, if it needs to.
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nortonspeed
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swooshdave said:nortonspeed said:Apparently all of us know for sure they are good mechanics. Make an educated guess do you think a Reborn Commando (Colorado Norton Works) or a Perfect Commando (Holland Norton Works) will 'leak from every joint'
At least CNW puts a really good breather on each engine. I assume HNW does too. What's your point?
Like I said have your engine done properly in the first place and if you like add the XS PCV valve (I fitted one :wink: ) as an extra.
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Sorry Dave, but if you put them together right they don't leak or need a breather valve.
I've had a lot of scavenging problems with my old 850 since fitting the very efficient mikrsxs breather, since removal no more problems or leaks. I am however, thinking of drilling that small return hole that you drilled in your valve (I think it was you :? } to reduce its efficiency and might refit it.
Cash[/quote]
Your bike appears to be the exception. Which leads us to think there might be something else going on with your bike.
As for not needing a breather has been discounted by some very intelligent people over the years (obviously I'm not on that list).
The return hole does not reduce the efficiency at all. It merely allows the oil to drain back to the sump, if it needs to.[/quote]
Dave,
I'm not alone here at all with reference to oil leaks, but I'm not anti breather valve, far from it.
With reference to scavenging, yes you are correct, removing the valve stopped the timing side filling up and improved scavenging, the problem totally went when I found the return filter gauze had been slowly trimmed short over the many oil changes had over the 200,000 miles motor has covered. Yes a new gauze did help.
If you think about your drilled hole it by passes the valve to allow drain back and therefore it must allow limited both suck and blow, clearly the valve can never act fully closed. And that might let my timing case drain.
Cash
I've had a lot of scavenging problems with my old 850 since fitting the very efficient mikrsxs breather, since removal no more problems or leaks. I am however, thinking of drilling that small return hole that you drilled in your valve (I think it was you :? } to reduce its efficiency and might refit it.
Cash[/quote]
Your bike appears to be the exception. Which leads us to think there might be something else going on with your bike.
As for not needing a breather has been discounted by some very intelligent people over the years (obviously I'm not on that list).
The return hole does not reduce the efficiency at all. It merely allows the oil to drain back to the sump, if it needs to.[/quote]
Dave,
I'm not alone here at all with reference to oil leaks, but I'm not anti breather valve, far from it.
With reference to scavenging, yes you are correct, removing the valve stopped the timing side filling up and improved scavenging, the problem totally went when I found the return filter gauze had been slowly trimmed short over the many oil changes had over the 200,000 miles motor has covered.
Yes a new gauze did help. If you think about your drilled hole it by passes the valve to allow drain back and therefore it must allow limited both suck and blow, clearly the valve can never act fully closed. And that might let my timing case drain.
Cash
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cash said:
The drain hole has no effect on the reed valve operation. It only allows the oil to slowly drain back when the engine is not working. Even as small as the hole is I'm not sure that it will even do that.
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nortonspeed said:Apparently all of us know for sure they are good mechanics. Make an educated guess do you think a Reborn Commando (Colorado Norton Works) or a Perfect Commando (Holland Norton Works) will 'leak from every joint'
Every joint? No... Without a PCV, some joints and most bikes, yes. Oil will find a way out with a pressurized case, particularly the way our cases are constructed...
Even Kenny Dreer said that his VR880s 'needed a babysitter.'
Cheers,
- HJ
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