How-To: Crank Case Breather Mod (with pics)

[frizzanz]

Thanks again for this great thread everyone!! [up] I decided to do this mod last night, and it only took about 30 minutes to complete. I decided to run my tube/filter back to the rear of the machine to help try and keep it clean. I have a TT so some offroading does occur from time to time. Now, in the low RPM's, she purrs like a kitten.

 

[cronus1987]

here's my $10 PVC catch can.

the drain on the bottom is for an air compressor and works great. looks better than a radiator drain too IMO.

 

[AussieBuellRida]

Gday all... this might sound like a stupid question, but im not all that mechanically minded. Just wondering what this mod actually does and if it makes a difference. I have a 2010 CR, wondering if it is worth doing and if it is the same set up on my bike, as it is in the pics.

 

[BuddhaBuell]

AussieB
I do believe its for the XB's...

here is a cut/paste from one of the most knowledgeable people on this forum....LeFox

"to explain the concept.
original routing re-uses already burned gasses, which still have some unburned particles into the mixture and route them back to the inlet to burn again, thus actually burning the mixture twice.
this causes less unburned particles to be released into the air, which is better for the environment.
in this mixture, there are of course also exhaust fumes which don't burn that good and which prevents your engine from running optimal, especially at low rpm when there's not enough fresh air getting mixed with the already burnt mixture.

so, by re-routing this, you are no longer pushing fumes back into the engine, but filling it with a fresh air/fuel mixture, making your engine run smoother and healthier.
but, although minimal, this does affect the environment.
and, since you are no longer re-burning that air/fume/unburned particle mixture, you will be adding more fresh air/fuel mixture. Which will give you some minor changes in your gas/mileage. "

If you click on his Profile as well as mod Stevenc150, you'll find a plethora of knowledge

 

[fwkapaun]

Did this mod this afternoon and my bike runs great! Thanks for a great write-up.

 

[Dancing Dogs]

i'd be interested in a full kit

 

[AussieBuellRida]

Thanks for that Buddha... now im imformed... geez I love this site...!!!!

 

[jet6]

Just a heads up to the guys interested in my catch cans, i now i have 3 guys wanting so next break from work ill be starting on them, and will also make a couple of extra ones, cause there is always someone else that wants one after ive done them

The guys that have contacted me, please feel free to email me at [email protected] for more info

Matt

 

[nkaperry]

Edit: Pic placement

 

[Pockets]

Clean job nkaperry.[up]

 

[Fock347]

i have no idea if this was done b4 but, i just connected my crank case breathers together. i did it around july so far no problems. no idea if its bad to do this.

 

[nkaperry]

Right on thanks pokets. Unfortunately Im waiting for an engine temp sensor, so I have no idea how this simple mod has helped. Because the bikes apart and I can't ride it, I feel the need to work on it.

 

[RH12s]

Fock347, do you mean you connected them together without a filter between?? so no venting???

 

[dallasb]

I don't think that doing a closed loop system for your breather is a good idea...sounds like eventually something has to give. Also isn't the idea of the mod to get the gasses out of the cylinder?

 

[Fock347]

ya no venting at all. ive had no issues with it.i might change it back .

 

[nativeXb12Rbuell]

without a filter ( or open hose to the outside) to let the gases ESCAPE from the crankcase or vented back into the air intake to be burned in the combustion chamber,, it would build up excessive pressure in the crankcase and also cause poor idle , it is a basicly a pcv valve just like on your car it needs to be either vented to the outside atmosphere or vented back into air intake (pcv valve uses vacuum from the intake manifold to draw the fumes from the crankcase)... it needs to be vented out or directed back into air intake.

 

[nkaperry]

So I found a catch can that I liked and made the addition to my original crankcase breather mod.

I used an old wrench for the bracket. Here it is before being bent to fit.

Here it is installed to fit

The bottom of the original catch can had a pressure release that wasn't sealed 100%. I broke that off and JB Welded a penny at the bottom of the catch can.

As you can tell some ingenuity was used to make this happen. Take your time and put some thought into your mods to make them original!

PERRY


Edit: Pic placement

 

[Defender88]

 

[nkaperry]

nice defender. I love me some Red Bull!

 

[Fock347]

nkaperry , lovin the use of a mini water seperator.lol