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Post by scooterb on Sept 7, 2013 7:30:29 GMT -5
I have read a few post about removing the emissions canister and items.... I need to confirm it is ok to cap the valve cover vent. I plan to cap the items circled in red  Items removed...  Thanks |
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Post by millsc on Sept 7, 2013 7:40:17 GMT -5
do not cap the vent leave it open to the air, if you cap it, it will build pressure and bad things will happen. Cap the other two put a hose on the valve cover vent the second circle and route it toward the bottom of the scoot, leave it open.
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Post by scooterb on Sept 7, 2013 7:51:39 GMT -5
do not cap the vent leave it open to the air, if you cap it, it will build pressure and bad things will happen. Cap the other two put a hose on the valve cover vent the second circle and route it toward the bottom of the scoot, leave it open. Thanks! |
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Post by phssthpok on Sept 7, 2013 9:07:50 GMT -5
do not cap the vent ... if you cap it, it will build pressure and bad things will happen. ...put a hose on the valve cover vent ...and route it toward the bottom of the scoot, leave it open. I am FAR from a tree huggin' bunny luver, but there's no reason to vent the crankcase * to the open air when you have a perfectly serviceable air box to plumb the hose into. The vapors from the crankcase will get sucked into the airflow and burned, rather than dumping unburned fuel (blow-by) and hot oil vapors into the environment.  Cars have a PCV valve in the valve cover that is typically plumbed to the engine side of the throttle blade(s) in order to scavenge these vapors. Ideally, you would plumb the valve cover (middle red circle) to the intake manifold (top red circle), but unless you want to futz around with patching together differing diameters of hoses, then plumbing it to the air box (preferably the engine side of the filter element to ensure vacuum) is a close second.  *The crankcase is directly linked to the area underneath the valve cover via the timing chain passage. |
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Post by robrun on Sept 7, 2013 11:45:44 GMT -5
(o) If you plumb it to the airbox install a catch tube about halfway with a T connect and hose - preferably clear. Otherwise the oil that does get by gets into your airbox and eventually, your carb.
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Post by phssthpok on Sept 7, 2013 12:13:58 GMT -5
 If you plumb it to the airbox install a catch tube about halfway with a T connect and hose - preferably clear. Otherwise the oil that does get by gets into your airbox and eventually, your carb. You make a good point, but I would consider that a small maintenance price to pay. An occasional inspection/cleaning of the carburetor/air box would probably be a good thing in the long run.  Perhaps in the process of constructing the catch-can the plumbing from the can on the vacuum side could be a reduced diameter that would fit the manifold port as well, thereby bypassing the air box/carburetor altogether and negating any carb fouling possibilities? |
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Post by robrun on Sept 7, 2013 16:53:58 GMT -5
You could I guess. Seems like extra work though. Personally I'd be more comfortable with gravity (the catch tube) and the air filter itself as a safegaurd/barrier to that
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Post by scooterb on Sept 7, 2013 21:15:23 GMT -5
Thanks for all the great information. Instead of the air box how about straight to the intake manifold? would this work?  On a side note.... what is the expected RPM at full throttle? And for tuning the carb is a good starting point 2.5 turns out? I am ready to tune the carb after doing everything else on the PDI. |
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Post by phssthpok on Sept 7, 2013 21:22:36 GMT -5
That routing would be ideal, so long as you can ensure there is no vacuum leak where it connects to the manifold.
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Post by alleyoop on Sept 7, 2013 21:23:37 GMT -5
NO!! Do not connect the Valve Cover Vent to the INTAKE MANIFOLD. It will suck in oil and you do not want oil down in your chamber. I tell everybody to take the hose put a Fuel Filter on the end of it and zip tie it high on the frame. If it squirts oil out it will not get all over the underneath and engine and will drain back down. REMEMBER the Valve Cover Vent hose HAS TO VENT, so do not kink the house or block it or your crankcase will create to much pressure and blow out your seals and or gaskets.
Alleyoop
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Post by prodigit on Sept 7, 2013 22:09:01 GMT -5
I think oil is a good thing for the air filter. If the air filter is a sponge-type of filter, oil on it is a good thing to keep it moist and filtering better... I wouldn't know how to rout it to the airfilter though....
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Post by scooterb on Sept 8, 2013 8:24:54 GMT -5
There is actually a small hole in the intake I think I can use.  This will allow it to get pulled back into the engine and burned off....  And it will be easy to clean.... |
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Post by millsc on Sept 8, 2013 8:58:42 GMT -5
All I know is I was doing a big bore kit on a scooter accidentally kinked the vent let it run for a few minutes shut it off went to check the oil and got a hot oil bath it sprayed like a geyser
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..BAD TO THE BONE..
