Interesting comments.

Big Pistons.

Oil mist.

Run better.

Clean itself up.

Black flaky paint like stuff.

The internal combustion engine is what it is and Harley does not have a special set of rules.

One question I read that did not get answered, why does Harley run the vent into the EFI, The government requires them to burn the emissions as opposed to dumping into the atmosphere, it has been proven that the vacuum effect of the intake creates negative crankcase pressure which frees up the engine as the pistons are not forcing their way down having to overcome the pressure.

I'd like to see anyone post a Dyno result that proves performance increase with no other change than the re-routing of the crankcase vent.

Did I mention that oil has less tendency to foam in a vacuum. it is also a fact that negative case pressure helps to prevent seal leakage.

Long before positive venting we had atmosphere venting and if you took an engine apart you found carbon on pistons and valves. I am not saying oil is not a participant but, if you have bad valve guides, bad seals or weak piston rings, you will have oil moving past them, more so on decal than excel.

Go for it, take my words apart as you feel. There is plenty of historical facts available.

 

Posted for all the world to see on dk customs site

 

Well, well, well. This will quiet the mob now. Torque right were we need it especially 2-up. But how does venting to the atmosphere increase HP & torque?

 

Dnt ask me lol.. Maybe dk will chime in

 

I got straight A's in pseudoscience. I think I know what I'm talking about. P.S. up until about 3 years ago they were still venting ney engines to atmosphere with no adverse effects on the engine.

 

Ok I googled it. WTF is a ney engine?

 

"New".

 

Pseudoscience.....sheesh! Seems the only "pseudoscience' being spewed here comes from yourself, sir.

Have you ever seen a race or hot rod motor that is not vented to atmosphere? I've built many motors for hot rods and have always (unless directly instructed by the owner) vented to atmosphere with nothing but positive effects. I do the same with my own stuff. Do some research, man!
As far as those old draft tubes go, they actually worked quite well. It wasn't until the EPA came along that they went the way of the dinosaur. And condensed water that accumulates in a motor is not purged by the PCV OR draft system. That condensation must be boiled out of the oil. The very reason it's not a good idea to start your bike every couple of weeks in the winter to charge the battery. Doing so will not evaporate the moisture from the oil.

 

I commend you for posting the dyno sheet, I don't buy it for a second but you posted it like I asked.

I'm keeping my PCV technology intact, you do what you think best.

PS, for those of you who change from PCV to Atmosphere, you are changing your A/F ratio, might want to take that into consideration.

 

the ECM will adjust for that little bit of air gone