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Old 08-16-2010, 12:01 PM   #1
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crankcase breather tube with small air filter

so I read the how-to on the flapper mod and the OP said he used a 3/8" air filter on the crankcase breather tube.

Cool - so I go to the auto store and get one of those small air filters - package says fits 3/8" - 1/2"

get home = no, tube is just a hair too big 1/3 - 1/4 inch maybe. So I take it back to the store and return it. Can anyone 100% confirm that a 3/8" filter works?

The crank case breather tube was a hair too big.

1. is the tube actually 3/8" ?
2. should I have just bored out the air filter rubber fitment piece to make it fit? Then used the provided clamp to tighten it down?

Boring it out just a hair just dawned on me while I'm sitting here at work.
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Old 08-16-2010, 12:27 PM   #2
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Re: crankcase breather tube with small air filter

Most sanctioned race organizations and some track days require that the crankcase breather be vented to some form of catch tank...be it the airbox or a separate container, and that venting to atmospheric with a filter and a hose is not adequate. Remember, it is about the safety of others and YOU that these rules are written. Same reason real race lower fairings are one piece and must be capable of containing several quarts of oil. I only bring this up since you are "LEANING" towards the track and less street.

You can discount this comment and reply that you're not racing and the track day organizer doesn't check this.......but remember that the intent of the rules is safety, both yours and others. Who wants to have their day put to an end and a damaged bike and/or body because someone else puked oil out the crankcase breather....you think a filter is going to stop it? A little oil in your airbox never hurt anything, really. Imagine that potentially you are on the receiving end of this scenario....

Think about it, man.
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Old 08-16-2010, 12:33 PM   #3
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Re: crankcase breather tube with small air filter

hmmm your point is valid. I have no clue how tech in works, so not sure if they check it or not.

I'll hold off till after my TD and route the tube back into the airbox for now.

Since I did the airbox mod to allow for more clean dense cooler air in, I am not particular about routing in dirty hot air.
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Old 08-16-2010, 01:53 PM   #4
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Re: crankcase breather tube with small air filter

i wouldn't think that you would get much hot dirty air from the base. and yes oil on the track is a no no. the marshals will not befriend you if you have them out there scrubing oil off the track.
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Old 08-16-2010, 04:54 PM   #5
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Re: crankcase breather tube with small air filter

More reasons then just the hot dirty air... If you have the air box mod done, and you still route the crank case vent into the airbox, your new mod will cause extra pressure to build in the air box, in turn, causing more pressure on the vent, in turn, making more pressure inside the case, in turn, causing less HP from the motor.

So there are reasons for it. .

John
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Old 08-16-2010, 05:21 PM   #6
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Re: crankcase breather tube with small air filter

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Originally Posted by GSXR-Freak View Post
More reasons then just the hot dirty air... If you have the air box mod done, and you still route the crank case vent into the airbox, your new mod will cause extra pressure to build in the air box, in turn, causing more pressure on the vent, in turn, making more pressure inside the case, in turn, causing less HP from the motor.

So there are reasons for it. .

John
So.....route it to a legitimate catch tank, rather than the airbox, as I said in my original post: crankcase breather be vented to some form of catch tank...be it the airbox or a separate container......right?
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Old 08-16-2010, 05:26 PM   #7
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Re: crankcase breather tube with small air filter

CCM, I am not disputing that at all. I agree 100% with that.

My statement was based purely on the hot dirty air subject.

John
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Old 08-16-2010, 05:43 PM   #8
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Re: crankcase breather tube with small air filter

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Originally Posted by GSXR-Freak View Post
CCM, I am not disputing that at all. I agree 100% with that.

My statement was based purely on the hot dirty air subject.

John
You just like airing dirty subjects...
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Old 08-16-2010, 05:45 PM   #9
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Re: crankcase breather tube with small air filter

Lean.....use this:
6GSXR7OCT
Suzuki GSXR 750 Oil catch tank
This little tank catches oil that gets spit out through the crank case breather hose on high performance engines. The professional and best looking way to solve this problem.
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Old 08-16-2010, 06:01 PM   #10
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Re: crankcase breather tube with small air filter

or you could reroute it to the front of the airbox underneath the filter assy where the pressure would not be a problem not would oil collection and it would still be a sealed system.
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Old 08-17-2010, 08:37 AM   #11
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Re: crankcase breather tube with small air filter

how much is that catch can you postsed ccm? edit $89.90 + shipping

I was thinking of using something like this - seal the top - maybe pack it with some kind of foam (just a little) - make a few vent holes near the top so the can doesn't explode - make a hole for the hose - insert it - seal it - clamp it or zip tie it on the inside of the frame somewhere so the oil falls to the bottom - voila.


Last edited by Lean With It; 08-17-2010 at 09:54 AM.
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Old 08-17-2010, 09:45 AM   #12
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Re: crankcase breather tube with small air filter

Beer can with the line into it is all some the guys run here on the track.
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Old 08-17-2010, 09:48 AM   #13
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Re: crankcase breather tube with small air filter

yea - I may just use a Rockstar Energy Drink can, since these are my custom GSXR decals

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