How much Oil in Intake Plenum is Normal?
Thread Starter
Racer
Joined: Jul 2006
Posts: 343
Likes: 0
From: Denver, CO
How much Oil in Intake Plenum is Normal?
I read a few other threads on this and basically came up with this
condition as "normal". The condition being oil inside the intake plenums.
How much is normal? Is there any way to stop it?
What you see in the picture is after both sides were drained onto
the newspaper.
condition as "normal". The condition being oil inside the intake plenums.
How much is normal? Is there any way to stop it?
What you see in the picture is after both sides were drained onto
the newspaper.
Captain Obvious
Super User
Super User
Joined: Aug 2003
Posts: 22,846
Likes: 348
From: Cambridge, Ontario, Canada
Originally Posted by RichS 1986928
I read a few other threads on this and basically came up with this
condition as "normal". The condition being oil inside the intake plenums.
How much is normal? Is there any way to stop it?
What you see in the picture is after both sides were drained onto
the newspaper.
condition as "normal". The condition being oil inside the intake plenums.
How much is normal? Is there any way to stop it?
What you see in the picture is after both sides were drained onto
the newspaper.
Looks normal to me.
Rennlist Member
Joined: Jul 2006
Posts: 5,424
Likes: 630
From: Bloomfield, MI
Devek did sell a "replacement" baffle plate for under the oil filler, it did reduce the oil pulled into mine. I also replaced other PVC parts at the same time.
How old is that oil... looks kinda dark
How old is that oil... looks kinda dark
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From: Portland, Oregon
Thats not bad. 928 engines suck...literally! The breather venting sucks oil from the cam housings into the plenum. Be glad you don't have a GTS! 
Go to Louie Ott's website as he was able to reduce this issue on the earlier cars by creating a vent drain to the crank case.
This event is actually a good thing for different reasons. No matter, the engine runs fine regardless. As stated, stomp her a few times to produce some serious suck...like from 0-120.
Go to Louie Ott's website as he was able to reduce this issue on the earlier cars by creating a vent drain to the crank case. This event is actually a good thing for different reasons. No matter, the engine runs fine regardless. As stated, stomp her a few times to produce some serious suck...like from 0-120.
Racer
Joined: Jan 2007
Posts: 391
Likes: 0
From: North Las Vegas
Be REAL glad you dont have a C5 Vett! I have 2 oil catch cans installed on mine to catch all the oil sucked by the PCV into the intake! If you are not very confortable with the oil accumulating, you may want to consider a catch can. They do work!
Rob
Rob
Thread Starter
Racer
Joined: Jul 2006
Posts: 343
Likes: 0
From: Denver, CO
HA!... off the melon topic, I'm gonna remember this the next time I take flak for not
searching through posts to find tid-bits of info!
This oil is over a year old, only around 2K miles though, she's overdue, I know. Waiting for spring.
The oil coming off the dipstick looks a lot nicer than what was in the plenums.
Thanks for the Louie Ott website tip : http://www.performance928.com/cgi-bi...ss_parent=1128
So I understand what's happening. Right now I don't want to take apart the entire intake to install
a baffel or stainless steel wool. The steel wool in the system scares me anyway.
If I'm clear then taking it to redline would only suck the oil out of the Driver's side plenum on my
86, because there is no outlet on the passenger side.
Due to the fact that I've still got a really long 'to do' list before I even think of Louie Ott's fix.
I'm going to have to get in the habit of draining these guys. The risk is Detonation right? I've
heard about that risk with 928s being pushed for racing applications. How bad is this risk for
normal driving? I might of missed it, but for all the 928 info/tips I've read this is the first time
I've found out I need to drain my Plenums and that seems odd.
searching through posts to find tid-bits of info!
This oil is over a year old, only around 2K miles though, she's overdue, I know. Waiting for spring.
The oil coming off the dipstick looks a lot nicer than what was in the plenums.
Thanks for the Louie Ott website tip : http://www.performance928.com/cgi-bi...ss_parent=1128
So I understand what's happening. Right now I don't want to take apart the entire intake to install
a baffel or stainless steel wool. The steel wool in the system scares me anyway.
If I'm clear then taking it to redline would only suck the oil out of the Driver's side plenum on my
86, because there is no outlet on the passenger side.
Due to the fact that I've still got a really long 'to do' list before I even think of Louie Ott's fix.
I'm going to have to get in the habit of draining these guys. The risk is Detonation right? I've
heard about that risk with 928s being pushed for racing applications. How bad is this risk for
normal driving? I might of missed it, but for all the 928 info/tips I've read this is the first time
I've found out I need to drain my Plenums and that seems odd.
Drifting
Joined: Nov 2001
Posts: 2,233
Likes: 1
From: zürich, switzerland
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Right now I don't want to take apart the entire intake to install a baffel or stainless steel wool
Remove the oil filler cap, drop the stainless steel wool into the little basket and put the cap back on.
Maybe max 30 seconds even on a bad hair day
Marton
Three Wheelin'
Joined: Dec 2003
Posts: 1,729
Likes: 0
From: Vancouver, Canada
Originally Posted by marton
Nothing to take apart..
Remove the oil filler cap, drop the stainless steel wool into the little basket and put the cap back on.
Maybe max 30 seconds even on a bad hair day
Marton
Remove the oil filler cap, drop the stainless steel wool into the little basket and put the cap back on.
Maybe max 30 seconds even on a bad hair day
Marton
Don't think I have one on my '85. There is a baffled plate where the filler neck meets the block. These are NLA and incorporate the seal. Please check that some PO hasn't removed it and just put gasket material to create a seal. If I tried to stuff stainless steel wool down the filler, it would end up in the crankcase. Ouch!Glenn
