Bitz EFI Clean Install oil breather connect

[motorstereo]

I am installing the Bitz CIS to EFI kit on my '81 911SC. My airbox has leaks, so I decided to go the "Clean Look" route and got a cut-down airbox (Thanks Tony!) and it's all going together slowly but surely.

Here's my problem: I cannot figure out how to route the oil breather hose that formerly was routed from the oil filler to the sensor plate/throttle body air flow "Boot", now that I have deleted the CIS sensor plate and FD.

I have read the Installation Guide and several posts about the oil breather hoses, but I cannot find anything specific to the "Clean Look" routing of the upper oil breather hose. Am I missing something? If I'm not mistaken the photo shows the upper oil breather hose disconnected from the boot.

[timmy2]

Last 2 posts on this page here may help.
Finally, back in the game!

[MichaelSJackson]

I just drilled a hole in the back of the rubber (cobra?) neck. It's a logical equivalent to the original location in the back of the rubber bridge to the throttle body?

I may have used a hose clamp or wire tie on the inside of the neck? To keep it from popping out. But I did keep it a pretty tight fit.

[psychoideas]

I could be wrong but doesn't the pipe from the oil filler neck go into the side of the original airbox closest to the oil filler neck?
And the aluminium angle in your pic that goes into the rubber boot between the sensor plate and the throttle body, comes from the Auxiliary Air device?

[Ginger77]

That's what I was thinking too based on my CIS in my 77. Maybe those changed after that and an '81 is different?

[MichaelSJackson]

The Auxiliary Air Regulator does/did obtain filtered air from the rubber boot. But it's simpler/cleaner to just attach a small K&N filter instead.

The output from the AAR is connected to a port at the base of the airbox via a hard line. When I was working on the clean look, I found the port on the bottom of my airbox was blocked off because the airbox hadn't been drilled out? The hardline has a fork up to another CIS gizmo (I forget). I cut the fork off (leaving enough to put a cap over) and deleted the gizmo.

So my AAR is still mounted in the original location. (I've seen others moved to the firewall.) It does take some drilling/grinding to avoid interference with the fuel rail mounting bracket.

Michael J.

[MichaelSJackson]

I thought I'd try to add pics for my description above.



K&N filter attached to AAR



AAR hardline with fork to CIS gizmo cut off and capped

[motorstereo]

Michael and Dennis-- thank you! The detailed photos are a great reference.

[JB3K]

Ahh very helpful photo!!