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Good thread. After reading through this I investigated some on my bike. I took my AC cover off and pulled the air filter. I had a very small amount of oil residue on the filter plate and my air filter was lightly oil stained at the bottom of the filter. I looked inside the throttle body and it looks exceptionally clean. I have 10k on my bike and 9k on my AC setup. It does not appear that venting back into the TB is a problem on mine.
Would venting to the atmosphere be that much more beneficial if there appears to be no problems with current setup?
Pic inside throttle body.
That's how mine Looked , but when I wiped it out with a paper towel I got a bunch of Black Crap on the Towel .
How come it's marked left,but is on the right side?
I initially cut the frame protectors to match the frame rails left and right (they're not quite the same). Then I just cut the protectors to fit either side. They are used to protect the Softail shocks which are below the frame rails by about 1/4". Other Harleys don't have to worry about damage when the bike is lifted, at least to shock anyway.
That's how mine Looked , but when I wiped it out with a paper towel I got a bunch of Black Crap on the Towel .
Even though my throttle body looked clean I used the paper towel wipe also and it came out with a black residue. I will be making this easy mod also. No sense sending that crap back into the engine when it can easily be re-routed.
Even though my throttle body looked clean I used the paper towel wipe also and it came out with a black residue. I will be making this easy mod also. No sense sending that crap back into the engine when it can easily be re-routed.
Oil mist from the engine will be relatively clean. The black you're getting is probably dirt which makes it past the air filter, getting trapped in the oil film.
I get this on one of my cars, even though there is nothing from the crankcase being routed to the intake. In my case, the oil film comes from the K&N filter (and I've had this with every K&N type filter I've ever used, even new and factory oiled, never re-oiled). It wipes off pitch-black.
So, if you are using a kit like Arlen Ness that vents back into the throttle body you're kind of doing the same as if you weren't running an external vent. You're just feeding it back into the engine, which is no good for the top of your pistons apparently.
So, if you are using a kit like Arlen Ness that vents back into the throttle body you're kind of doing the same as if you weren't running an external vent. You're just feeding it back into the engine, which is no good for the top of your pistons apparently.
Yes, which is why you block these "vents" when you tap the AN intake
for venting to atmosphere. Here's a picture showing high-temp
RTV that fills the entire "vent channel" in my AN intake.
Vented mine to ground today for $19.00. 4' of 1/4" id black fuel line, 1 - 1/4" id brass T, box of 6 but only used 3 - 1/2" corbin fuel line clamps.
I have the Fuel Motor Air Cleaner. I drilled out the FM rubber vents and fed my new vent line through the rubber piece. I placed the line over the HD vent and the old rubber vent supports the new line and keeps it in place. I ran my line after the T to the front of my bike then down and under back to the frame by the rear shocks.
I have the HD Nostalgia cover and all of this is completely hidden behind the AC cover. You can only see about 10" of the remaining line.
The hardest part was drilling out the soft FM vent plugs. This is a quick, easy and cheap mod that I think my engine is better off in the long run from doing.
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Last edited by kneesinthebreeze; Jan 7, 2015 at 03:18 PM.
Here's a question I keep coming back to when considering buying the DK Kit to help me with venting outside of my engine.
I have over 10,000 miles on my engine and they've all been with an aftermarket air cleaner that vents back into my engine. So my question is this, is there really a point on switching now after those 10,000+ miles?
I have 10k on mine also and hopefully will have another 90k more to put on it. I just figured why would I want to keep dumping hot oily gases down through the combustion chambers for the rest of my engines life when this mod can be done quickly and cheaply.
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