3sgte recirculated, Now with PICS! Options

[jgreening]

Today Carl at Speed Source made me a new intake so I could recirculate my Greddy BOV. Here are the results:

1. No more backfires
2. No more puffs of black smoke out my tail pipe
3. No more ricey BOV sound
4. Better response after shifting

All in all, a great mod - unless you like the sound (which I don't).

Here are the pics:





This post has been edited by jgreening: Jul 15, 2006 - 2:09 PM

[jgreening]

I don't understand. We are talking blowby here. The intake charge has already been ingested by the engine correct? The blowby is an air / fuel mixture.

I can tell you that my bogging, smoking, and backfires have all stopped despite my PCV vented to atmosphere.

From the information I have read tonight, it seems Art is correct that the rerouting back into the intake (or exhaust for that matter) serves as a vacuum source for the PCV to help the blowby exit. Another thing I don't understand is why a vacuum source is needed. I don't undertand why that air doesnt just escape without the vacuum source.

[phattyduck]

I don't understand. We are talking blowby here. The intake charge has already been ingested by the engine correct? The blowby is an air / fuel mixture.

I can tell you that my bogging, smoking, and backfires have all stopped despite my PCV vented to atmosphere.

From the information I have read tonight, it seems Art is correct that the rerouting back into the intake (or exhaust for that matter) serves as a vacuum source for the PCV to help the blowby exit. Another thing I don't understand is why a vacuum source is needed. I don't undertand why that air doesnt just escape without the vacuum source.

The BOV is much more important that the PCV when it comes to how the car runs.

As a quick note, if you route the PCV to the exhaust, this only works on N/A cars with a fast-acting one way valve inline. The negative half of each exhaust pulse creates the vacuum. Turbo cars generally have pressurized exhaust (pre-turbo) or non-pulsing exhaust (post turbo) and thus cannot use that method.

The more vacuum there is in the crankcase, the better. The pistons actually have somewhat significant pumping losses moving the air around inside the motor. Big V8 drag cars often have specific vacuum pumps to keep the crankcase at a reasonable vacuum (and gain 10s of HP from it).

-Charlie