Anyone try this yet? What did you find?

 

I was levitated and I thank you for it

 

Dammit Jim, I'm a doctor, not an English teacher!

 

The only way for there to be a boost condition post s/c is for there to be a vacuum condition pre s/c. THAT is why I said, "however does the air get in." The supercharger sucks at one end, and blows out the other: vacuum and boost. Well, I am not certain if the Eaton creates boost, as it may be compressed post s/c (as a true roots does, I believe).

Further, I believe the roots was invented for mine ventilation, not building. But I could be wrong.

 

I didn't "attack" anybody.


Dude, whatever.



Thank you for taking your last post tone down a notch but I have nothing more to say to you....good day.

 

vac·u·um P Pronunciation Key (vky-m, -ym, -ym)
n. pl. vac·u·ums or vac·u·a (-y-)
Absence of matter.
A space empty of matter.
A space relatively empty of matter.
A space in which the pressure is significantly lower than atmospheric pressure.
A state of emptiness; a void.
A state of being sealed off from external or environmental influences; isolation.

You may very well be right about the mine ventilation. You are wrong about the vacuum though.
Conditions below atmospheric are a normal part of how an engine works.
Once again, naturally aspirated engines exhibit vacuum conditions. These are the same conditions in our motor.
Maybe I'm just not explaining this right.

 

Whew!

 

For those interested this is actually quite a good read. http://auto.howstuffworks.com/supercharger3.htm

BTW yes they were infact used for ventilating mines.

This thread is actually quite amusing to read!!

 

DialM - I see what your line of thinking is... thanks for the input!

Jet engines are capable of sucking human beings and other large objects into their intake. Jet engines are probably the most powerful turbo chargers/gas turbine generators out there. They are also capable of reversing the flow of air through the compressors, creating compressor stalls. This can be caused by turbulent air and/or abruptly closing the throttles.

suction - the act or process of exerting a force upon a solid, liquid, or gaseous body by reason of reduced air pressure over part of its surface.

vacuum - a degree of rarefaction below atmospheric pressure

It seems like we are splitting hairs or turning this post into a science class to determine whether we are creating suction or vacuum. I guess if you are a physicist I can see this thread might get your panties in a bunch. And yes, I did look up the proper spelling of physicist while looking up the other definitions.

I guess it is a "suction cleaner" not a vacuum cleaner?!?!?

DialM - thanks again for your humble opinion

 

If you want to step up and spend a few dollars this book is a very good read.

Not much mention of vacuum though

 

It's been 16 hours and no-one has even gone out to try to see what is happening first hand (specifically first finger LOL)?

Want to learn something, instead of spouting off theories? Go get your hands dirty. It's as simple as starting the engine, openning the bonnet, pulling off one hose. All of 45 seconds from start to finish. Rather you'd spend hours typing/debating something you've got no actual experience with!

No wonder people who do have both their hands and heads inside the engine tend to leave NAM (or the performance forum), because there seems to be no stopping the ones that spread ignorance.

 

All I wanted to do was share what I did concerning the OCC's. I kept the stock routing. I even asked Jeff Perrin (Alta) about what I was planning to do and he said that this was fine. I did my research and shared. This was just a simple thing. I am sorry it became more than just sharing. Just stick to the facts. We are here to learn from one another, not bash each other.

CARL

 

Are you the Riddler..?? Why not just tell those debating and end it all.

 

What if we already know the answer. Are we supposed to go try anyway and report back to you?

 Wow! I thought I was the harsh guy

 

I just did and I know the answer!

Thanks dominicminicoopers!

I just hope I had the correct air line now.

I even showed Pep'r my accountant wife even knows the answer.

Once you do it twice....it is less than 45sec.

 

Carl you are 110% correct....oh wait is it possible to have 110%.

Thank you again for taking the time to post your work so others could learn for it.

The install is very clean and thank you for giving me the idea of fab'ing a mount off the motor mount.

 

Ditto, Ditto, Ditto

 

I love getting my hands dirty.....I just could not check it yesturday becasue I was at work and did not get home until 10pm. Just give me a reason to touch an engine and I am on it.

 

Carl, it is vitally important to know what's going on with that line from the upstream side of the s/c. I say this because it's ALTA who says to disconnect and plug that pipe. Now, being a smart consumer, you need to understand the mechanics and application of why BMW decided to run a hard line there and why they decided have a vacuum applied to the head. So I did some research to find out why.

And what I found will suprise you.

Once you do know the truth for that pipes function, you won't be so quick to plug it off. Or even try to attach ALTA's "collaspable" tubing to that vacuum source. I bought ALTA's catch can, but when I received it I decided not to put it on after I found out this little tidbit of knowledge.

I'm not going to cap off the vacuum line! I'm not going to run their easily collapsable tubing that will have vaccum


Carl, I'm trying to stick to facts and not hearsay. Hence the reason why I wanted someone to get out from behind their computer and actually feel something for real.


Not bashin', just trying to show you how to be a critical thinker. Go get your hands dirty and let me know if ALTA's correct in thinking that you don't need that vacuum source coming from pre-s/c, or that their collaspable lines they supply are strong enough to handle the vacuum. (FWIW, it looks like you're running hard tubing there insead of the blue collapsable tubing ALTA supplies...you did good in doing so.)

 

Uh, no. Air moves on its own because of pressure differences within a system. Atmospheric pressure is higher than the pressure of the air at the supercharger inlet, that is why it moves from, well, the atmosphere, into the supercharger. A roots supercharger captures air pockets in its lobes and moves it. When it takes captured air away from the inlet, a vacuum is created there, causing new air to move towards the inlet. While this is not the location of the vacuum condition earlier posters were referring to, it is a vacuum created by a supercharger, and thus perfect joke material for poking a stick at all the belly-button contemplators that were screaming, "superchargers don't create vacuums." They do, on the inlet side. If they didn't, no air would move into them. Hence my comment that if they don't create vacuum, "however does the air get into them?"

 

Man oh man.


No wonder Andy and Tuls left.

 

Well said. This goes with every technical writeup on Roots style supercharges I've ever read. If a roots style s/c doesn't create vacuum on the "fill side", then air would never get into them!

When the engine is at idle, the engine's vacuum is what is seen on the grey tubing in question. This is because the bypass valve is open and the air being pumped by the supercharger is recirculated rather than allowing it to create boost, but the engine still needs to breathe and hence the vacuum seen pre-supercharger.

 

So, instead of an apology for telling me I was wrong, or refuting my explanation, you turn to some disapproving clap-trap? Don't let the door hit you on your way out.

 

Wow! How far did that rattle fly this time.

You're still wrong.

There is a "vacuum" on the inlet side due to restrictions in the induction path.
Close the throttle high vacuum, WOT less vacuum. Right?
If what you're saying were true there would be more vacuum at WOT.
Now for arguments sake lets say there is no restriction pre-supercharger. Let's just say it's open to the world. Would there be a measurable pressure drop in front of the inlet? No, not until there is a restriction. Slap your hand over the inlet and yes you will get a lot of negative pressure quickly.

Now lets just say you take the belt of the supercharger and make the car an NA car, stupid I know but I'm trying to speak to the level of my audience, well just one audience member. (Apologies to everyone else for the inane level of name calling this has sunk too but hey! I remember the bad kids in school )
Will you now tell me that the car won't run at all because it can't pull air into the motor? Vacuum exists without the supercharger. What I don't know( yes one again contrary to your assertions otherwise, I don't think I know everything. That's just one of the many nice things you've said about me. Hope you feel all manly about that) is the difference in vacuum readings between an MCS and an MC.
If anyone has this info I'd like to see the data. Based on the proposed theory there should be a significant difference.

So Mr Chest Thumping Name Calling Guy. You're still clueless and quite a bit more rude and pissy than what you've accused me of being.
So I needn't apologize because you're still wrong, except the mine thing but hey Google makes a lot of people look smart.

Your overuse of the whole "door hitting you on the way out" phrase well demontrates your clap trap limit. At least come up with something original

I breathlessly await your witty and acerbic rejoinder. Oh! Some real facts too.
Now go Google something to make you look smart

 

Once you do know the truth for that pipes function, you won't be so quick to plug it off. Or even try to attach ALTA's "collaspable" tubing to that vacuum source. I bought ALTA's catch can, but when I received it I decided not to put it on after I found out this little tidbit of knowledge.

I'm not going to cap off the vacuum line! I'm not going to run their easily collapsable tubing that will have vaccum

What are you talking about? This makes no sense without any data to back you up.