PLZ HELP with Crankcase Ventilation!!!!!

[$uperstang]

So, I have the Ford Racing tall valve covers. Oil fill plug on driver side. And on the passenger side I have set-up the throttle body tube with a hose going in to the top of the valve cover (just like stock set-up). I figured If I left the ventilation just like stock I would have no issues. Well with a 325 stroker build being a little bit of a change here is the issue. When the car is idling and I pull the dipstick out there is a huge suction type vacuum sound, I mean so loud that it sounds like a shop vac sucking air! What should I do??? I am thinking about plugging the throttle body tube and just putting a breather on the pass side as opposed to the set-up I have now???? Anyone??? I know this will cause unmetered air getting in to the engine but there are so many others I see running it this way?????


Thanks

 

[SQUEEZE&STROKE]

Wait, so you only hear the sucking sound when you pull the dipstick out?

On your valve covers you say you have one side plumbed into the intake tube (like PCV) what about the other side? Is it sealed? If it is, leave it, that much suction will actually be good for your motor. It would be just like putting a vacuum pump on it.

 

[$uperstang]

Yes the one side is plumbed in to the intake tube to the valve coever. The other side is sealed with a plug type push in grommet. It sucks very hard when I take the dipstick out and the idle drops slightly and seems to run better. When I put the dipstick back in the idle goes up. You think this is good? I heard with storkers they need to breath more so they should be vented more?

 

[vristang]

Where is the pcv? You didn't mention it.

The pcv will be a vac leak when you pull the dipstick, which is why it is important to have a good seal on the dipstick.

 

[mustangsquared]

yes, people actually read these things.....

 

[Michael Yount]

Are you absolutely certain that the air path from the nipple on the throttle body through the hose to the nipple on the valve cover/oil fill tube is clear of obstructions? Sounds like that path is somehow being blocked -- so when you pull the dipstick, make up air is coming in there. Nothing at all happens on mine when I pull the dipstick out at idle.

 

[$uperstang]

Are you absolutely certain that the air path from the nipple on the throttle body through the hose to the nipple on the valve cover/oil fill tube is clear of obstructions? Sounds like that path is somehow being blocked -- so when you pull the dipstick, make up air is coming in there. Nothing at all happens on mine when I pull the dipstick out at idle.

MIke,

The path is clear. What I did was use teh same stock plastic air tube from the throttle body. Then I took a standard PCV valve and drilled the guts out of it and pushed that in to a grommet attached to my valave cover and just hooked the hoes up to the modified PCV valve. The stock PCV valve system is still in place. I think I may just try a breather and see what happens. Either way I am going to get it tuned soon so maybe that will help or my tuner will tell me the best way to set it up. Amazing how little s h i t like this has people thinking so much!

 

[$uperstang]

Are you absolutely certain that the air path from the nipple on the throttle body through the hose to the nipple on the valve cover/oil fill tube is clear of obstructions? Sounds like that path is somehow being blocked -- so when you pull the dipstick, make up air is coming in there. Nothing at all happens on mine when I pull the dipstick out at idle.

MIke,

The path is clear. What I did was use the same stock plastic air tube from the throttle body. Then I took a standard PCV valve and drilled the guts out of it and pushed that in to a grommet attached to my valave cover and just hooked the hose up to the modified PCV valve. The stock PCV valve system is still in place. I think I may just try a breather and see what happens. Either way I am going to get it tuned soon so maybe that will help or my tuner will tell me the best way to set it up. Amazing how little s h i t like this has people thinking so much!

 

[seijirou]

Hold on a minute.

The tube on the throttle body is port vacuum, you don't draw any vacuum from that tube unless the throttle blade is partially open. (Or you have the dirtiest air filter known to man) If you don't believe me, idle the motor, pull that tube off the valve cover and stick your finger over it, you won't feel any suction. That little tube has nothing to do with this, so don't worry about it.

Any cankcase vacuum is going to be coming from your PCV valve in the lower intake. Nothing comes to mind as this vacuum being a problem offhand, you mght get some serious oil sucked past the pcv valve though. I've personally never seen that much vac in the crankcase before but I could believe it.

 

[$uperstang]

Funny thing is, is that when my car was stock. I didn't know any better and I purchased a screw in breather and put that on in place of my oil cap because it looked cool and never thought anything about it. The car seemed to run the same and everything, no problems at all. But now with this stroker motor and the compression I think it is a little sensitive.