[Diy_efi] Venturi effect crankcase breather

[Shannen at grolen.com]

DI>--- Matt Porritt <porrittm at anet.co.nz> wrote:
.

DI>That would essentially create a vacuum leak.  What
DI>vehicles have such a setup?  I've never seen one
DI>before.  Without a way to measure the content and rate
DI>of flow into the engine from such a port, there's no
DI>way you could accurately fuel the engine.

Adam, I think you're out of your range of experience here.  This is what
PCV is all about.  Speed density systems need to measure neither content
nor rate of flow into the engine via PCV system.  MAF systems are
sometimes very dependent on the correct pcv valve being installed.
Other MAF systems supply fresh air to the pcv system via a tube
connected between MAF and throttle plates.  The PCV system is 39 years
old, so you have probably come across at least one correct
implementation in your 15 years under the hood.  A simple search for PCV
on google "nets" many pages with this information.

Shannen

DI>> On highly boosted cars, this is removed as the
DI>> valves fail and 25psi+ into the crankcase is not a
DI>> desired result.

DI>That's sensible.

DI>> I'm also looking at a crankcase breather, BEFORE the
DI>> throttle body, with no PCV valve on it.

DI>It's quite common for vehicles to have an "input" into
DI>the crankcase that is taken after the air filter, thus
DI>keeping dust and dirt from entering the engine.

DI>> I never agreed you points were valid.

DI>S'funny, you sure didn't have a problem with them in
DI>the previous posts.

DI>> You brought 'Sports bikes' into the
DI>> equation (Sportsbikes like a Zephyr?? HA!)

DI>Who says a Zephyr is a sport bike?  Try to stay on
DI>topic, please.

DI>> Read what you wrote that I replied to.

DI>I have.  It's not terribly coherent.

DI>> I spend 10hours + a day under the hood of
DI>> performance vehicles.

DI>Maybe you should learn how to work on the, so you
DI>don't have to spend so much time on them.

DI>> You seem to have talked to someone at Harley
DI>> Davidson.

DI>Among many, many other things.

DI>> Perhaps it is you that needs time under the hood.

DI>No, I think 15 years is sufficient.

DI>=====
DI>| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
DI>| "It was like an emergency ward after a great catastrophe; it  |
DI>|   didn't matter what race or class the victims belonged to.   |
DI>|  They were all given the same miracle drug, which was coffee. |
DI>|   The catastrophe in this case, of course, was that the sun   |
DI>|     had come up again."                    -Kurt Vonnegut     |

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