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Post by toddmaples on Oct 12, 2014 15:22:27 GMT -5
So I have a vacuum line going from my intake to a "T" fitting, one line goes to the valve cover and the other goes to what appears to be the transmission gearbox.
My new intake does not have the nipple to connect this line back.
Wouldn't a PCV valve run to the valve cover and gearbox be a possible solution?
Thoughts, suggestions? Replacing the factory intake snorkel is the ultimate goal.
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Post by alleyoop on Oct 12, 2014 19:30:15 GMT -5
So I have a vacuum line going from my intake to a "T" fitting, one line goes to the valve cover and the other goes to what appears to be the transmission gearbox. My new intake does not have the nipple to connect this line back. Wouldn't a PCV valve run to the valve cover and gearbox be a possible solution? Thoughts, suggestions? Replacing the factory intake snorkel is the ultimate goal. That is wrong, there should be NO VACUUM going to the Valve Cover or your Tranny. A hose from the valve cover is a VENT to vent the crankcase and the same with the Tranny there should be a hose just to Vent the Tranny NO VACUUM. So you need to take some pictures of the carb area, fuel line from the gas tank to either a Petcock or fuel pump and hoses to the carb etc.. So we can tell you where each hose goes and what it is for. Alleyoop |
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Post by toddmaples on Oct 14, 2014 17:03:57 GMT -5
 The line in question is highlighted in red. This was like this from the factory. I'm assuming its a pressure equalization system to keep from blowing seals at high RPM. My new intake has no nipple for this line to connect. Would putting a PCV valve on this line solve this problem and keep a slight vacuum on the engine which appears to be the purpose of this setup? This bike still has its PAIR system on it, if it matters. |
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Post by gatekeeper on Oct 14, 2014 21:28:44 GMT -5
The part you are referring to is not called the intake. The intake is on the other side of the carb. Since your new snorkel doesn't have a nipple on it just take a fuel filter and attach it to the end of the hose and tie it off to the frame somewhere above the engine. That will allow the crankcase to breath and give any oil blown out a chance to run back down into the engine. The purpose of the original setup is to direct any oil fumes blown out of the engine a chance to recycled and burned in the engine.
Vacuum is separate from this. It's source comes from the intake manifold of the other side of the carb.
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Post by toddmaples on Oct 15, 2014 16:44:26 GMT -5
Vacuum is separate from this. It's source comes from the intake manifold of the other side of the carb. The pistons downstroke pulls air from the intake manifold, carb, snorkel, and cleaner/filter assembly. Having a nipple on the other side of the carb still produces vacuum, but (depending upon several factors) it is not as strong as at the intake manifold itself. Spray a cracked snorkel with ether or starting fluid and the engine revs because vacuum is drawing in the fumes from the outside of the snorkel. Your suggestion is viable for returning oil to the crankcase once the filter reaches saturation, but leaves the problem of the vacuum. This is where the PCV valve comes into play. The PCV valve only allows air out, so on the pistons up stroke it actually pulls a vacuum on the crankcase. I believe I'm going to combine our ideas. Between the valve cover vent and tee I will add a filter, then the pcv valve to where the line used to meet the snorkel. This should keep oil in the engine and vacuum pulled on both cracnkcase and gearbox. Anyone feel free to dispute my logic with this as I'm still learning. |
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Post by alleyoop on Oct 15, 2014 17:02:09 GMT -5
Let me put up a picture and see if your valve cover looks like this, with the vent hose connected to it and ask where does your hose on your motor goes to. Alleyoop  |
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Post by gatekeeper on Oct 15, 2014 17:32:53 GMT -5
Vacuum is separate from this. It's source comes from the intake manifold of the other side of the carb. The pistons downstroke pulls air from the intake manifold, carb, snorkel, and cleaner/filter assembly. Having a nipple on the other side of the carb still produces vacuum, but (depending upon several factors) it is not as strong as at the intake manifold itself. Spray a cracked snorkel with ether or starting fluid and the engine revs because vacuum is drawing in the fumes from the outside of the snorkel. Your suggestion is viable for returning oil to the crankcase once the filter reaches saturation, but leaves the problem of the vacuum. This is where the PCV valve comes into play. The PCV valve only allows air out, so on the pistons up stroke it actually pulls a vacuum on the crankcase. I believe I'm going to combine our ideas. Between the valve cover vent and tee I will add a filter, then the pcv valve to where the line used to meet the snorkel. This should keep oil in the engine and vacuum pulled on both cracnkcase and gearbox. Anyone feel free to dispute my logic with this as I'm still learning. The hose going to your snorkel is pushing air out from the crankcase. Plugging the nipple on the snorkel, or putting on a snorkel without a nipple, will not effect the vacuum supply on the other side of the carb. Vacuum, as used on a scooter, is a product of the combustion chamber, not the crankcase. There is really no benefit to put a PCV valve on your scooter. The filter will keep water and dirt from entering the crankcase. |
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..BAD TO THE BONE..
