Here's the deal, I know and understand that vents and catchcans work great to relieve crankcase pressure, but I always found it weird that the system was designed to be vacuum assisted at most times. Obviously if you leave the stock pcv system in tact with an FI setup, under boost it should not function properly. I came up with an idea and have been running it like this for over a year with no problems and great results, but would appreciate some TECHNICAL feedback... Have a look at the pics before you read on.

[IMG][/IMG]

[IMG][/IMG]

Now theoretically, while at idle or any time out of boost, crankcase gas is actually sucked into intake manifold via engine vacuum and valve 1. The vacuum situation within the hose holds valve 2 shut. During boost, the pressure in the manifold holds valve 1 shut and the outward flow goes freely out valve 2 to atmosphere. Just to clarify a couple of things, the catch can is a ghetto *** water separator from an air compressor, but catches oil beautifully. The pcv valve in the cover is gutted and basically an elbow fitting at this point. Valve 2 does NOT leak vacuum at idle. The point of this whole idea was to simply modify the STOCK pcv system to work effectively in an FI application. Thanks for looking!


Modified by oneludesol at 4:52 PM 5/6/2007


Modified by oneludesol at 4:55 PM 5/6/2007

 

up

 

that is actually pretty nifty, im impressed with the ingenuity. Im looking forward to seeing if any technical feedback arises.

 

Bump for a good, CHEAP idea.

 

Thanks, I'm going to copy it, use shiny parts and mass produce it and sell it on Ebay!

j/k

What kind of valves are you using? And how well do they hold up under boost?

 

All stock honda valves, valve 2 just has the elbow cut off... Everything is holding up beautifully. I am going to make the whole setup a little bit easier on the eyes sooner or later.

 

 

nice

 

up

 

write up??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by esedulerp5tenin &raquo;</TD></TR><TR><TD CLASS="quote">write up?? </TD></TR></TABLE>

I may make one up, right after I mod one more thing...

[IMG][/IMG]

rather than just a breather, this too will pull vacuum and yank out the crankcase gas!

 

That would be good cause you'll have something drawing gasses out while in boost. just make sure you put a pcv valve on that too so when your in vacuum you dont suck any exhaust gases into your engine.

 

good f*ing call bro, i would have rolled around for a year or two before that struck me thanks!

 

up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by oneludesol &raquo;</TD></TR><TR><TD CLASS="quote">

I may make one up, right after I mod one more thing...

[IMG][/IMG]

rather than just a breather, this too will pull vacuum and yank out the crankcase gas!</TD></TR></TABLE>
Please do!

 

so let me get this straight

during idle, all gasses are sucked into the manifold due to vacuum

during boost, all gases escape through that one pcv valve next to to the IM?

 

that is correct, not only idle, but any time out of boost

 

How about connecting the crankcase vent to the front of the Turbo intake?

When under boost and your engine are making The most crankcase pressure due to some blowby, then the vacum from the intake will remove the pressure.

 

where can you locate a water separator from an air compressor. ive checked home depot and ace hardware. am i better off getting a cheap catch can off of ebay? and where the breather filter is that you suggest be routed with another pcv valve to the "slash cut fitting" on the exhaust, could that be routed elsewhere? i just dont think that that is an option with my boosted b series setup. great write-up tho!!!! this is what honda tuning is all about: ingenuity!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by atec &raquo;</TD></TR><TR><TD CLASS="quote">How about connecting the crankcase vent to the front of the Turbo intake?

When under boost and your engine are making The most crankcase pressure due to some blowby, then the vacum from the intake will remove the pressure. </TD></TR></TABLE>

eh, i dont want that **** going through my turbo!! lol

 

i got the separator at autozone or discount, i dont remember, you will need to go to home depot for the fittings though. whole thing cost me like $11

 

this is great. much thanks for the idea as i was having blow by issues and needed a catch can anyway. used a air water separator from a husky air compressor. all together cost under 20 bucks with fittings ts hose clamps and hose. will update on efficiency of catch tank.

 

glad it helped, did you use the valves too? make the setup pretty and post some pics!

 

So i take it this is our project for the week?

 

perhaps... i need to get that goddamn fpr installed and back these ****** injectors off a cunthair or 2.