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Engine Specific Info and Questions => IDI Engine => Topic started by: windsnob54 on June 20, 2007, 12:10:11 pm

Title: crankcase vent hose question
Post by: windsnob54 on June 20, 2007, 12:10:11 pm

what is the popular consensus on what to do with the hose that vents the crankcase?

originally it got routed back into the intake, i've been told that this is not good, what options exist?

thanks

Title: crankcase vent hose question
Post by: jtanguay on June 20, 2007, 12:47:39 pm

if blowby is really bad you can route it to a catch can.  you will need to empty the can every once in a while.

Title: Re: crankcase vent hose question
Post by: tylernt on June 20, 2007, 05:19:57 pm

Quote from: "windsnob54"

originally it got routed back into the intake, i've been told that this is not good, what options exist?

It's fine with some modifications such as cleaning the valve cover screen, adding the camshaft oil splash shield and an oil separator (if your car didn't already come with them), and tee-ing in a hose into the valve cover breather and running it down to the crankcase vent by the oil filter. And all that isn't really necessary unless your engine is worn and has lots of blowby.

Title: crankcase vent hose question
Post by: OM617 on June 20, 2007, 09:03:22 pm

I just vent mine straight to the atmosphere via a road draft tube.

Title: crankcase vent hose question
Post by: stewardc on June 25, 2007, 09:50:14 am

Mine will vent into this.

(http://img.photobucket.com/albums/v648/stewardc/Truck/100_5232.jpg)

Title: crankcase vent hose question
Post by: Darth Garry on June 25, 2007, 12:28:05 pm

I am building an oil catch tank as well.  

Garry

Title: crankcase vent hose question
Post by: knowtwodrugs on June 25, 2007, 03:32:06 pm

I'm adding a catch-can as well.  I was told that the reason for the breather is to help prevent waste exhaust or some crap?  It's an environmental thing or something like that.  All I know is that it really uglies up my air filter.

Title: crankcase vent hose question
Post by: tylernt on June 25, 2007, 03:49:00 pm

Venting the crankcase to the atmosphere allows some nasty hydrocarbons to pollute the air. Also, you have to empty the can.

IMHO there's no reason to use a catch-can if you have a well-maintained breather system and normal blowby. If you have enough blowby that the breather system can't keep up, you have bigger problems to worry about than catch-cans.

Just my .02. I know a lot of guys run catch-cans but I think they're all crazy. ;)

Title: crankcase vent hose question
Post by: OM617 on June 25, 2007, 11:16:00 pm

Quote from: tylernt

Venting the crankcase to the atmosphere allows some nasty hydrocarbons to pollute the air.

Oh yes, I'm sure my ~4cfm of CCV fumes coming out of the tube are a major contributor to "global warming".

Title: crankcase vent hose question
Post by: tylernt on June 25, 2007, 11:25:48 pm

I'll be the first to scoff at the global warming scaremongers, and I'll readily agree that it's completely silly to go to great lengths to curb the tiniest bit of pollution. But the breather system is so simple and easy, it's almost more work to set up a catch can than it is to just use the stock system. ;)

Title: crankcase vent hose question
Post by: Darth Garry on June 26, 2007, 05:26:33 am

Yeah, maybe I should give my system a closer look.  I don't have a problem with blow-by, so why should I be adding a catch-can?  

Hmmm, and less work to boot!

Garry