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I'm haven't seen any threads talking about adding positive crankcase ventilation to the conical filters, so here's a crack at it.
I decided to try out the conical filters, these are the inexpensive ones, but they have a fairly deep lip where they hook up to the carburetors, so they don't block off the holes at the edge of the carbs. One thing I noticed after putting them on was the bike seemed to be a lot more lively than with the stock air box. Unfortunately the crankcase fumes while I was idling was fairly unpleasant, so I decided to try venting the fumes into the carbs like the factory air box does.
From Auto Zone, I bought a PCV valve, rubber PCV elbow, PCV grommet, 2 - 1/4" tees, and about 3' of 1/4" vacuum hose.
From Home Depot I bought a 3/4" copper pipe end cap, 4 - 1/4" brass barbs, brass nuts and some washers.
I drilled two holes in the end of the copper cap, and used some rubber grommets that I had laying around to seal the tees to the end cap. The PVC grommet snapped into the end of the copper cap, and that pretty much completed the bottom end of the system, here' a picture of it installed:
Then I drilled a hole in the center of each conical filter and added the brass barbs to the filter. I had to use washers to help get the nut to seal down on the barb, but all in all it was fairly straight forward. I then cut the 1/4" vacuum hose to length to hook up all 4 of the filter pods. Here's a couple shots of the filters hooked up:
It seems to be working fine, and no crankcase smell. If it holds up well I'll be happy. If it doesn't work so well, you'll probably hear about it in a later post.
Oh, by the way, I added a T shaped support to hold up the back of the carbs. Thanks to one of the other posts I had read here talking about having to support the carbs when you do away with the factory air box. I used the original factory air box mount points to anchor my T-bar support, you can barely see part of the support in pictures 2 & 3 above.
Thanks to every one for all the prior posts the helped me get this far!
I decided to try out the conical filters, these are the inexpensive ones, but they have a fairly deep lip where they hook up to the carburetors, so they don't block off the holes at the edge of the carbs. One thing I noticed after putting them on was the bike seemed to be a lot more lively than with the stock air box. Unfortunately the crankcase fumes while I was idling was fairly unpleasant, so I decided to try venting the fumes into the carbs like the factory air box does.
From Auto Zone, I bought a PCV valve, rubber PCV elbow, PCV grommet, 2 - 1/4" tees, and about 3' of 1/4" vacuum hose.
From Home Depot I bought a 3/4" copper pipe end cap, 4 - 1/4" brass barbs, brass nuts and some washers.
I drilled two holes in the end of the copper cap, and used some rubber grommets that I had laying around to seal the tees to the end cap. The PVC grommet snapped into the end of the copper cap, and that pretty much completed the bottom end of the system, here' a picture of it installed:
Then I drilled a hole in the center of each conical filter and added the brass barbs to the filter. I had to use washers to help get the nut to seal down on the barb, but all in all it was fairly straight forward. I then cut the 1/4" vacuum hose to length to hook up all 4 of the filter pods. Here's a couple shots of the filters hooked up:
It seems to be working fine, and no crankcase smell. If it holds up well I'll be happy. If it doesn't work so well, you'll probably hear about it in a later post.
Oh, by the way, I added a T shaped support to hold up the back of the carbs. Thanks to one of the other posts I had read here talking about having to support the carbs when you do away with the factory air box. I used the original factory air box mount points to anchor my T-bar support, you can barely see part of the support in pictures 2 & 3 above.
Thanks to every one for all the prior posts the helped me get this far!
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