ive searched!! catch can with itbs?
04-01-2007, 07:56 PM
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ive searched!! catch can with itbs?
ok so i have my itbs installed in a b18
Right now i have a greddy catch can.
i have one line of the can going to the stock breather on the calve cover
the other line has a pcv valve in it then goes to the vacum source which is my golden eagle vacum log. To help crank case venting. My ques is will that work ok or just good enuff to get me by?
I know that these engines have under capable pcv systems from the get go. So i just wanna make it safe thanks
Right now i have a greddy catch can.
i have one line of the can going to the stock breather on the calve cover
the other line has a pcv valve in it then goes to the vacum source which is my golden eagle vacum log. To help crank case venting. My ques is will that work ok or just good enuff to get me by?
I know that these engines have under capable pcv systems from the get go. So i just wanna make it safe thanks
04-01-2007, 08:05 PM
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Re: ive searched!! catch can with itbs? (4ornia)
run one from the valve cover and another from the back of the block. remove the "black box", install a freeze plug in that hole and then install a nipple on the block. search around on here you will figure out what i am talking about. i wouldnt run a line from the catchcan to your vacuum log with a PCV in it.
04-01-2007, 08:09 PM
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Re: ive searched!! catch can with itbs? (lohatch)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lohatch »</TD></TR><TR><TD CLASS="quote"> i wouldnt run a line from the catchcan to your vacuum log with a PCV in it.</TD></TR></TABLE>
why?
and if i run a line from the breather to the back of the block i have no vacum assist venting and from what i understand that is needed because the stock plentum is the usaul vac source no with itbs i dont have any except the vac log
why?
and if i run a line from the breather to the back of the block i have no vacum assist venting and from what i understand that is needed because the stock plentum is the usaul vac source no with itbs i dont have any except the vac log
04-02-2007, 07:23 AM
#7
Honda-Tech Member
with my itb's and a catch can, here's how i do it.
I just have the pcv valve tube going from the factory breather box to the can.
I also have the line off the valve cover going to the catch can.
The can also vents to atmosphere.
That's it. I don't plumb it into my vacuum system at all - that would be very wrong.
I just have the pcv valve tube going from the factory breather box to the can.
I also have the line off the valve cover going to the catch can.
The can also vents to atmosphere.
That's it. I don't plumb it into my vacuum system at all - that would be very wrong.
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04-03-2007, 08:35 AM
#14
Re: (4ornia)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4ornia »</TD></TR><TR><TD CLASS="quote">how is that wrong thats how it is on a stock pletum car please explain how that is wrong?</TD></TR></TABLE>
People say it's wrong because it allows oil vapor to be sucked into the intake. This contaminates the air/fuel charge and aids detonation. The stock system MUST recycle/burn oil vapor to comply with emissions laws. Adding extra oil "catch-cans" to a "stock" PCV system will help reduce the oil contamination, but will not completely eliminate it.
Keep in mind that street engines spend most of their life at part or closed throttle. The OEM PCV system uses the manifold vacuum to help keep the crank case pressure low which most likely will help decrease pumping losses and increasing fuel economy (if the oil contamination isn't bad). Since fuel economy & emissions are not a big a concern on a race car or custom performance hot-rod, a lot of guys simply remove the PCV system and vent their catch cans to atmosphere.
Venting your crank case to the atmosphere is illegal on a street car, so simply adding baffled catch cans to your stock system will be the most environmentally friendly option. With an ITB setup, you would have to run the line from your valve cover to a port on the ITBs just before the throttle plate on one of the runners. Then the line from the PCV valve would run to your vacuum log...
Some guys (Larry @ Endyn) recommend using a slash cut tube on the "pre-throttle" port facing directly into the path of oncoming intake air charge to keep the PCV system's flow direction from reversing at low manifold vacuum (WOT). If you don't want a slash cut tube sticking directly into your intake air flow path, you can always add a second catch can between the "pre-throttle" port and the valve cover. This will allow the PCV system to reverse direction, and still keep oil from entering your intake charge...
People say it's wrong because it allows oil vapor to be sucked into the intake. This contaminates the air/fuel charge and aids detonation. The stock system MUST recycle/burn oil vapor to comply with emissions laws. Adding extra oil "catch-cans" to a "stock" PCV system will help reduce the oil contamination, but will not completely eliminate it.
Keep in mind that street engines spend most of their life at part or closed throttle. The OEM PCV system uses the manifold vacuum to help keep the crank case pressure low which most likely will help decrease pumping losses and increasing fuel economy (if the oil contamination isn't bad). Since fuel economy & emissions are not a big a concern on a race car or custom performance hot-rod, a lot of guys simply remove the PCV system and vent their catch cans to atmosphere.
Venting your crank case to the atmosphere is illegal on a street car, so simply adding baffled catch cans to your stock system will be the most environmentally friendly option. With an ITB setup, you would have to run the line from your valve cover to a port on the ITBs just before the throttle plate on one of the runners. Then the line from the PCV valve would run to your vacuum log...
Some guys (Larry @ Endyn) recommend using a slash cut tube on the "pre-throttle" port facing directly into the path of oncoming intake air charge to keep the PCV system's flow direction from reversing at low manifold vacuum (WOT). If you don't want a slash cut tube sticking directly into your intake air flow path, you can always add a second catch can between the "pre-throttle" port and the valve cover. This will allow the PCV system to reverse direction, and still keep oil from entering your intake charge...
04-03-2007, 08:49 AM
#15
Re: (94eg!)
I have been thinking about trying one of these compressor air line water separators on my ITR motor between the PCV valve and the intake manifold. This will see exactly how effective the stock oil-separator (black box) is by measuring how much oils making it past and into the manifold. For only $23 at Sears, it sure beats the pants off of some expensive racing "catch-can" system. I found this guys writeup about installing two of these on his Turbo whatever. Seem to be VERY effective at separating oil...
http://www.mx6.com/forums/1g-f....html
Parts:
Very effective (after 500 turbo miles):
Modified by 94eg! at 11:58 AM 4/3/2007
Modified by 94eg! at 11:58 AM 4/3/2007
http://www.mx6.com/forums/1g-f....html
Parts:
Very effective (after 500 turbo miles):
Modified by 94eg! at 11:58 AM 4/3/2007
Modified by 94eg! at 11:58 AM 4/3/2007
04-04-2007, 10:10 AM
#16
Honda-Tech Member
Re: (4ornia)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4ornia »</TD></TR><TR><TD CLASS="quote">anyone</TD></TR></TABLE>
why would you want oil in your intake charge?
If anything, I'd use a slash cut tube in my exhaust pre-cat (if you have one) to pull the vacuum of the catch can.....
why would you want oil in your intake charge?
If anything, I'd use a slash cut tube in my exhaust pre-cat (if you have one) to pull the vacuum of the catch can.....
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