woo i wish it didnt take that to get a clear response. what you say makes sense for sure

there is nothing to measure, im pulling in fresh air from the filter pic.

i would not think a proplerly running engine would have more blow by than this pump can remove, but if it is making more blowby than the pump can remove, well then the extra would just go right on out the fresh air filter,

Im NOT trying to pull a complete vaccum on mine, check the first pics.. not having this filter is probably for sure what causes the those 2 pumps to burn out, i should have noticed that sooner, but i ASSumed we were all on the same page on what the goal was.

having this filter will relieve any extra that the air pump cannot remove and at all other times provides the inlet for the fresh air to circulate trough the engine, just like the stock pcv system does.

the stock pcv system does not pull a complete vaccum on the crankcase, its pulls a small amount, from the air hole port on the front of the throttlebody.. my goal was a no oil in the inkake pcv substitute, and hats exactly what i did.

were you talking about this or did you want better ring seal todd?

David

that help any?

<small>[ February 12, 2003, 12:43 AM: Message edited by: MIGHTYMOUSE ]</small>

 

Mighty Mouse, I noticed you have a breather with your vacuum pump set up. Why? You are suppust to be pulling a vaccuum on you crankcase. You cannot expose the crankcase to the atmosphere it has to be in a closed environment. You will not pull a vacuum at all, you are shooting yourself in the foot. I cant tell if you still have all the stock PCV plumbing in there if so remove it all and cap off! The vacuum pump is your crankcase ventilation now, period. You should check to see how much vacuum you are pulling in the crancase as well (key on engine off will be fine) You should not pull more than 12 - 13 in" of vacuum (to be safe) or you will starve the oil pump at high rpms. If you are pulling more vaccuum than that you can drill a hole in your oil cap to bring the reading down. Start small and adjust accordingly

The main purpose of a vacuum pump (IMO) is to bring ease to the piston rings on the downward stroke (when positive crankcase pressure occures) to help oil control and blow by. It also helps out small oil leaks.

Hope that helps,

Sean

 

read the reply directly above yours. it should explain all that.

 

I think I will hook the catch can back up. I believe I figured out where the oil has been coming from. I did not use any sealant on the rocker bolts when I installed the ported heads. Believe the oil is mostly seaping down the rocker bolts into the intake ports. I am not certain this will completely alleviate the problem, but it will definitely help out.

Think I will pass on the air pump for now, and see what happens. Thanks for the info <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

Todd

 

Mightymouse, I still disagree.

Folks have tried to use the stock AIR pump for years. They are inadequate.

Do yourself a favor and make a call or two before continuing to push on this... Call up Madman.

The Cadillac 4/6/8 pump does work that is what this is.

And Gustin is right you can't run a breather too for obvious reasons. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MIGHTYMOUSE:
<strong> whatever then, i wont use up my time on this thread anymore.. its on my car now, and its working just fine for my purpose, so you can tell me all day long about how it wont work and it is only your loss.

if you want to try to get ring seal, this is definitely not the answer, i never said it was, READ READ READ if you want to replace the pcv system and not get any oil in the intake then this IS a good solution.

todd: maybe i misenterpreted 'evacuation' for ventilation, to me it means the same.. evacuation of blowby exhaust gasses from the crankcase, apparently every one else thinks it meanse to remove all gas possible from the crankcase.

but you did specifically say above you were worried about oil in the intake which can ONLY mean you are looking for a better pcv setup, which is EXACTLY what I have.

if the latter i must warn you that this while it will help with ring seal, will not double as a good pcv system because there is no fresh air entering the system. so it will be as bad for oil and engine life as just having breathers.

pm me if you need any more info.
Dave </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It is your loss my friend for thinking you are pulling a vacuum when you are in fact not. You are wasting your time, just run a breather or get a manly pump <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

good golly you dont listen, im not trying to pull a vaccum! im moving fresh air in, and bad air out, like the stock pcv system does

the stock pcv moves a negligable amount of air through the engine at wot

this aripump moves air at whatever cfm the pump can flow at 13 volts, thats a fact. im just drafting this air through the engine as the stock pcv does. but since its still working at wot unlike the stock pcv setup, it is in fact pulling more vaccum than stock at wot.. pressure could be above 1atm or below depending on rings and cid, but it does move air out at wot at the same cfm because its at the same voltage. since the air is being sucked out, it HAS to be at a lower overall pressure than air thats getting pushed out on its own.


hes not talking about a frikken vaccum pump!

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MIGHTYMOUSE:
<strong> good golly you dont listen, im not trying to pull a vaccum! im moving fresh air in, and bad air out, like the stock pcv system does</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">How the hell does the stock PCV pull in fresh air!? The PCV operates in a closed environment.

If you plan on keeping that filter on there you might as well go back to the stock PCV. Yes, the PCV does not operate well at WOT which is why that one hose that runs from the passenger side valve cover to the throttle body right in front of the butterfly blade. This hose is for WOT operation, as high speed air rushes past this hose/hole there is a vacuum pulled on this hose which leads to the crankcase.

Seriously you should remove your vacuum pump and go back to the stock or ZO6 PCV and save 5 - 7 lbs!

Sean

<small>[ February 12, 2003, 06:20 PM: Message edited by: Gustin ]</small>

 

The pcv tubing above the throttle-body blade is just a tiny bit below atmospheric pressure, because of the tiny vacuum restriction from the air filter.

The tubing below the throttle-body blade produces a more substantial vacuum from the engine, which at all engine speeds including WOT is in excess of the restriction resulting from the air filter. This causes pcv airflow through the crankcase from the tubing above the throttle-body blade.

The debate above is, do we want (or have) crankcase vacuum, or, do we want (or have)air flow?

When I crimp the tubing that comes from above the throttle body blade, then quite a bit of vacuum will build up in the crankcase and when I remove the oil filler cap I hear the vacuum being released in a "whoosh." If I crimp it long enough the vacuum will cause a little air to whistle through the oil filler cap. The point of this example is that, under normal pcv operation, we do not appear to have any measurable vacuum in the pcv system.

So we normally have a pcv vacuum relative only to ring blow by, etc, which is not too surprising and is no different from a breather cap system (assuming the air filter restriction above the throttle body is practically nothing).

However, drilling out a tiny hole on the oil filler cap is an interesting concept relative to an otherwise normal pcv system, suggested above. This would make a vacuum relative to atmospheric. Assuming I get a filter in place over the drill-out in the oil filler cap, how big a hole is about right to pull a slight vacuum? Who has measured this? People say that a slight vacuum makes a better ring seal, which makes sense to me, but exactly how big is the hole to make the right vacuum?

I use a paint compressor filter to filter aerosols out of the pcv system, but that shouldn’t make any difference to my question. This filter removes about 2 ounces of oil every 5,000 street miles.

 

that line to the throttlebody you speak of is the fresh air source for the stock pcv system.. its allready metered air that goes around the throttlebody, trough the crankcase, and into the intake behind the tb.

the ls6 valley cover setup still sucked in a lot of oil to the intake, thats why i stopped using it

 

whatever then, i wont use up my time on this thread anymore.. its on my car now, and its working just fine for my purpose, so you can tell me all day long about how it wont work and it is only your loss.

if you want to try to get ring seal, this is definitely not the answer, i never said it was, READ READ READ if you want to replace the pcv system and not get any oil in the intake then this IS a good solution.

todd: maybe i misenterpreted 'evacuation' for ventilation, to me it means the same.. evacuation of blowby exhaust gasses from the crankcase, apparently every one else thinks it meanse to remove all gas possible from the crankcase.

but you did specifically say above you were worried about oil in the intake which can ONLY mean you are looking for a better pcv setup, which is EXACTLY what I have.

if the latter i must warn you that this while it will help with ring seal, will not double as a good pcv system because there is no fresh air entering the system. so it will be as bad for oil and engine life as just having breathers.

pm me if you need any more info.
Dave

<small>[ February 12, 2003, 12:20 PM: Message edited by: MIGHTYMOUSE ]</small>