I was cleaning the blackwing this weekend and i noticed some oil around the inside of the throttle body so i started cleaning it. I took a peek inside and noticed that there is quite a bit of oil inside the actual plenum of the intake. Is some blowback like this normal or do i have a problem? I have a picture i just cant host it right now.

 

I think its normal. Hard to say if you've got a problem as I don't know how much you found. I'm working on a blown BMW M5 right now, and the airbox/plenum and intercooler always have a bit of oil in them.

 

Some oil is normal.

On the other end, don't overoil the Blackwing.

 

Are you sure you did not over oil your Blackwing?

 

 

I thought so too initially, but when he said at the throttle body and plenum, some is normal.

If he over oils the Blackwing to that extent, it should also be on the MAF wires, and the car wouldn't drive that well.

Well see, I guess.

 

Common problem with the pcv system, two cures one just vent at the valve covers,which is probably an emissions no no, or two install an compressor filter in the line running from the pcv to the TB. Do a search there were many posts concerning this.

 

Not that you have this problem but it is something you may want to keep an eye on...

Higher Than Expected Oil Consumption (Replace Rings and Engine Valley Cover) #01-06-01-023A - (Jun 19, 2002)
Higher Than Expected Oil Consumption (Replace Rings and Engine Valley Cover)
1999-2001 Chevrolet Camaro

1999-2002 Chevrolet Corvette

1999-2001 Pontiac Firebird

with 5.7L Engine (VINs G, S -- RPOs LS1, LS6)

This bulletin is being revised to add model years for the Corvette, information on the LS6 engine and parts information. Please discard Corporate Bulletin Number 01-06-01-023 (Section 6 - Engine).

Condition
Some owners may comment on higher than expected oil consumption. When checked, the oil consumption could be in the range of 400-600 miles per quart (700-1000 km/L).

On the LS6 engine only, the technician may find oil behind the engine throttle plate and in the intake manifold.

Cause
The cause for this condition may be an interaction between the piston rings and the cylinder bore in vehicles that are operated at higher RPMs -- typically manual transmission vehicles driven in a manner where the engine is frequently or consistently operating at greater than 3200 RPM.

On the LS6 engine only, the engine has a unique aluminum valley cover that has composite oil separating baffles and PCV plumbing incorporated. In some cases, the PCV baffle may not be properly sealed to the valley cover, causing oil to enter the PCV system.

Correction
On the LS6 engine only, replace the engine valley cover if oil is found behind the throttle body or in the intake manifold before replacing the piston ring. Refer to Engine Valley Cover Replacement in the Engine Mechanical - 5.7L subsection of the Corvette Service Manual.

A new set of piston rings is currently available through GMSPO. The new rings are part of a complete piston ring kit. Install only the number 2 compression ring and the oil expander ring from the piston ring kit. All other rings in the piston ring kit should be discarded. The original number 1 compression ring and the oil ring rails should be re-used in their original positions on the piston. All pistons should be used in the same cylinder bore.


Important
Do not dress or hone the cylinder bore. Nothing should be done to change the bore finish for this condition. Changing the bore finish may aggravate the condition.


Refer to the Unit Repair Manual for appropriate ring removal and replacement procedure.

The number 1 compression ring and the upper and lower oil expander rails are re-used because they are already broken in for the bore that they are in. The new number 2 compression ring is made with a very sharp edge that will break in quickly.

Changing only the piston rings noted, with no change in driving style, should change oil consumption to an acceptable level. Changes in driving style that reduce the amount of time spent at higher RPMs will also positively affect oil consumption.

In addition to the standard size piston ring kit listed below, a 0.25 mm oversized piston ring kit is available. The oversized piston ring kit should only be used in those rare instances where the cylinder bore size has been machined larger to accommodate the 0.25 mm oversized piston rings.

Parts Information
Part Number
Description
Qty

12568002
Valley Cover
1

88984247
Ring Kit, Piston
8

 

This is a 2001 z06 and has already had a re-ring done along with the pcv valve change. THe blackwing was not oiled at all i was just cleaning the air bridge part.

 

Any more ideas?

 

This is very, very common.. It's just a bi-product of the pcv system used on these cars.. It's not really hurting anything. Install a catch-can if it really bothers you.

 

I would get a catch can........and monitor it.

 

Here's another idea, again......