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Post by nando on Sept 16, 2017 4:19:24 GMT -5
Do i need a pcv valve
Ordering parts and i wanna know if the head has a pcv valve in it where the breather hose comes out.
I wanna delete the breather hose in the airbox. Do i need a one way pcv valve to put on the end of the breather hose?
Kymco 125
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Post by pistonguy on Sept 16, 2017 7:16:37 GMT -5
Do i need a pcv valve Ordering parts and i wanna know if the head has a pcv valve in it where the breather hose comes out. I wanna delete the breather hose in the airbox. Do i need a one way pcv valve to put on the end of the breather hose? Kymco 125 You don't have to have one but you if you don't you Must run a Catch can. Run the hose up high and stick the end a catch Can. I tried running two of the Valves from Scrappy and just had a Epic fail. The Valve I had on the Valve cover hose just seemed to start not letting the Crank pressure to escape properly. then you know whats next. With all that crank pressure built up on a 7,200 rpm run the second Valve I ran is on the end of a hose from the Oil Dipstick hole. I saw a few drops spew as I looked down at my tach then she puked a good half quart of oil all over the Floor board. When I went to put oil back in, geting close to full the oil was filled to the top of the fill hole. I have a Measurement funnel to put in the Correct amount, so I new I wasn't overfilling. Then I heard a squeaking noise coining from the valve cover pcv. Boom that was it, I just run that hose in a Clear catch can for now. Good Luck. |
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Post by dollartwentyfive on Sept 16, 2017 11:17:53 GMT -5
the head vent and crankcase vent on my 244 vented to the atmosphere.
of course, there were "baffles" in the valve cover to mostly prevent oil from seeping out.
a PCV valve is vented to the intake or air breather on the cars i've worked on, this probably explains pistonguys problems with them.
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Post by chewbaca on Sept 16, 2017 13:29:38 GMT -5
A two pack of stainless steel dish scrubbers $1 Two 2.5" end caps ¢50 6" × 2.5" section of PVC pipe ¢10? A .5" NPT tap $10 Any number of 1/2 NPT to 1/8 hose barbs Makes this thing 
catches all the oil and let's it drain back into the motor when stopped works very well as long as it's above the valve cover vent |
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Post by pistonguy on Sept 16, 2017 19:09:58 GMT -5
the head vent and crankcase vent on my 244 vented to the atmosphere. of course, there were "baffles" in the valve cover to mostly prevent oil from seeping out. a PCV valve is vented to the intake or air breather on the cars i've worked on, this probably explains pistonguys problems with them. Nah Brah I've been running this set-up for over three years with no issues.. The check Valve from Scrappy is Crappy and went South. wouldn't matter were it was vented to it wasn't venting... The pressure built up and the Oil came from the pcv I have running from my Oil dipstick hole The Valve cover pcv wouldn't vent enough to get the oil back in the motor. Good thing a ran two as if I didn't it would have Puffed all the seals out of her. Oh it was quite the sight, looked like a grenade from Daytona, Oiled down the rear wheel, pipe, a Smoke show she was. Scroll down a few and there is a good pic of my Two pcv in place. www.dansgaragetalk.com/topic/934-shooters-scooters-on-n2o/ |
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Post by pistonguy on Sept 16, 2017 19:25:11 GMT -5
A two pack of stainless steel dish scrubbers $1 Two 2.5" end caps ¢50 6" × 2.5" section of PVC pipe ¢10? A .5" NPT tap $10 Any number of 1/5 NPT to 1/8 hose barbs Makes this thing
catches all the oil and let's it drain back into the motor when stopped works very well as long as it's above the valve cover vent Chewy's on it again. This will work.  |
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New Rider
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Joined: Sept 13, 2017 8:55:56 GMT -5
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Post by nando on Sept 16, 2017 23:46:58 GMT -5
So is there a pcv valve built into the head where the hose attaches?
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Post by pistonguy on Sept 17, 2017 6:28:24 GMT -5
So is there a pcv valve built into the head where the hose attaches? No. |
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Post by pistonguy on Sept 17, 2017 8:42:26 GMT -5
the head vent and crankcase vent on my 244 vented to the atmosphere. of course, there were "baffles" in the valve cover to mostly prevent oil from seeping out. a PCV valve is vented to the intake or air breather on the cars i've worked on, this probably explains pistonguys problems with them. Curious, what are your technical hands on experience? Or what are your credentials? |
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Post by nando on Sept 17, 2017 17:19:07 GMT -5
So does the engine actually need a pcv valve? To keep pressure or something.
If pistonguy says there's no pcv valve in the top of the head then the pcv hose just goes to the airbox...no valve there.
Can i just route the hose to under the scooter and let it poo out on the road?
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Post by dollartwentyfive on Sept 17, 2017 19:28:19 GMT -5
So is there a pcv valve built into the head where the hose attaches? PCV valves are like your fuel filter, you buy one and install it, except in this case you don't need any clamps. although a couple of zip ties won't hurt. also, they only work in one direction. i never installed any, but i would assume the air flow would be FROM the engine. my setup didn't use anything except the hoses and tee. my bike didn't leak oil nor was there oil on the bike. the only thing i noticed was oil droplets on the bottom of the engine. i have no idea where they came from because i never lost any oil, or if i did it was an undetectable amount. my 244 ran just fine without a PCV valve. |
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Post by chewbaca on Sept 18, 2017 0:21:28 GMT -5
If you smell a greasy oily smell from your scoot you either need to clean the motor or the valve cover vent is emitting to air.
The carb is supposed to ingest those smelly gasses.
It's part of how it avoids running lean.
Normally a small chamber of the air box Is used to provide a Collection area for the oil mist to drop out of suspension.
The oil is collected in a tube to be periodically drained
This system is inadequate
Even when empty some oil gets into the intake and causes deposits on the valves and combustion chamber identical to the black crust that develops on the outside of a cast iron frying pan yuck.
And if the oil level gets high it starts to muck things up fast
It also provides no vacuum for the crank case
I think it's far better to buy or make an oil mist separator that drains back into the motor and keeps all the oil out of the intake.
Yet still puts the blow by gasses back into the combustion chamber.
Attaching to the intake manifold not the air box also provides a good level of vacuum in the crank case. Good for the seals and actually provides for a more powerful stroke
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Post by pistonguy on Sept 18, 2017 10:11:30 GMT -5
So does the engine actually need a pcv valve? To keep pressure or something. If pistonguy says there's no pcv valve in the top of the head then the pcv hose just goes to the airbox...no valve there. Can i just route the hose to under the scooter and let it poo out on the road? No the Engine does Not need a pcv.. Hoping you looked at my pictures in my link of my Two pcv equipped hoses, the one on the Left came from the valve cover and I have removed that now not working pcv with a new hose and run up high as you see and lop the end back into a simple Clear catch bottle. I have a hour or so run time on her and there is no oil in the bottle. I wouldn't recommend dumping it to the road, Not cool, slippery enough out there. Just think if I woulda dumped mine to the road I would have never known it was dumping until she cooked her. I have a eyeball on my bottle.. |
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Post by dollartwentyfive on Sept 20, 2017 12:32:56 GMT -5
If you smell a greasy oily smell from your scoot you either need to clean the motor or the valve cover vent is emitting to air. The carb is supposed to ingest those smelly gasses. It's part of how it avoids running lean. good point, and it's one that most people probably don't realize i often wondered how i could connect the vents to the carb/intake, but i couldn't resolve how i could filter the oil (and other stuff) out. i never did figure it out, so i left the vent hose dangling down the side of the engine. |
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Post by chewbaca on Sept 24, 2017 16:15:23 GMT -5
If you smell a greasy oily smell from your scoot you either need to clean the motor or the valve cover vent is emitting to air. The carb is supposed to ingest those smelly gasses. It's part of how it avoids running lean. good point, and it's one that most people probably don't realize i often wondered how i could connect the vents to the carb/intake, but i couldn't resolve how i could filter the oil (and other stuff) out. i never did figure it out, so i left the vent hose dangling down the side of the engine. I can easily make you one and send it or if you like show how to make one from something you have I have to make a new one any way |
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