An experiment

[Rocket Scientist]

Not sure if this has been done before. I put triple K&N's on several years ago. Also put on the little K&N behind the cylinders for the crankcase breather. I don't like that little basturd ! I retained my air box for storage so it's a real PITA to remove and clean. Also, over time the oil vapor collects on the back of the engine and starts to ooze out around the back. Not visible oil, just the mist which is just enough to collect dirt. That's why I like the "internal" combustion engine. Cause all the yucky stuff happens internally. (That came from a comedy skit where a gorgeous blond was explaining engines). So I tried something new (to me anyway). I put the s-curved hose back on that did go to the airbox. I swung it out some and connected it to a piece of 1/2" hose with a short pipe. I drilled a hole in the center K&N and connected the hose to it with a 90 deg. fitting. The K&N on the left has my air temp sensor in it. Voila ! No more PITA.

 

[Mittzy]

Nice work Fred

 

[Malcy]

Puts that minor amount of mist / fumes back into the motor = no mess. good thinking.

 

[Tripps]

The rings in the middle cylinder will last a little longer, too, with a little extra oiling.

 

[HansO]

it shouldn't be a problem but watch it for plug fouling, as now it will be sucking from the crankcase, they normally go into the still air side of an aircleaner box so it is just at normal air pressure not under a vacuum it would have been better to run it it into some sort of chamber (like a catch can) first with just a small tubing doing the sucking into the filter. I know Guys that have fitted Turbos to their diesel Toyota Landcruisers, they actually started to suck oil as well as the vapors up thru the crankcase breather so they have to run the breather thru a catch can arrangement as I just described

 

[Malcy]

Hans, I would have thought that for a motor to foul up plugs from a breather return hose would be in a pretty sorry state " if " a chamber had to be fitted, just saying.

 

[HansO]

Not saying they (the plugs) will but it would be good to keep an eye on them as I was amazed at how fast the oily film builds up on the back of the motor, I experimented with running a longer hose up under seat and finished it in a small plastic container it still made a mess so I reverted back to the little breather and regularly clean the back of the engine

 

[Rocket Scientist]

it shouldn't be a problem but watch it for plug fouling, as now it will be sucking from the crankcase, they normally go into the still air side of an aircleaner box so it is just at normal air pressure not under a vacuum it would have been better to run it it into some sort of chamber (like a catch can) first with just a small tubing doing the sucking into the filter. I know Guys that have fitted Turbos to their diesel Toyota Landcruisers, they actually started to suck oil as well as the vapors up thru the crankcase breather so they have to run the breather thru a catch can arrangement as I just described

That was my main concern, pulling to much vacuum on the crankcase. After I got it all hooked up I took it out and warmed it up. Then I took the oil cap off and ran the revs up and down placing my hand on and off the opening. I couldn't "feel" any vacuum. As long as I don't let my air filter(s) get to dirty I think I'll be alright. The first 90+ deg day will probably tell the tail. It wouldn't be hard to incorporate a catch can. I made one for my old 69' shovel head. I kept it oil tight for about 10 years after I rebuilt it (just to prove to myself it could be done).

 

[TRIIICK]

Only a Rocket Scientist could pull this off....

 

[HansO]

Good stuff I was not trying to poohah your idea just highlighting a possible problem, hope it works OK let us know as I may just do the same, .... anything is better than having to clean the back of engine