Oil Pressure issues

[rpmiii]

Possible. Just can't figure it out and want to see what people thought. Is there a way to test the oil pump? I guess having a gauge on it around town and it doesn't drop, only on the highway after it heats up, is a way of testing it. I appreciate it. Thanks.

[Billman]

Maybe your oil pump is not good anymore and when the oil is getting warm it simply can't provide the necessary pressure.

[rpmiii]

Nothing....

[rpmiii]

I am having issues with oil pressure also. I have a 91 CQ with a 3b head, a turbonetics turbo. The problem with mine is its good to run around the city, here and there, 4-5 bar, but when you drive it on the highway, around 85mph for 30 minutes or so oil pressure starts to drop slowly until the buzzer goes off. Had a mechanical gauge on it, and it reads the same as the gauge in the car does. Changed the oil (20-50) and filter (Mann) a couple of times and made no difference. I will have to check if there is a restrictor for the turbo oil inlet line. Just bought the car about six months ago and trying to figure it out. Sorry for butting in. I though it was appropriate. Any help would sure be appreciated. Going to pull the oil filter off and cut it open this weekend to check for metal and rubber pieces. The bottom end is a 7a but shouldn't matter? Had a generic white oil pressure switch on it (white one) so I put a know to be working 3b one on. Didn't change gauge readings. Any suggestions.....

[JP]

As I mentioned in the previous post all the 7A heads I've come across have been plugged. Now I know they are dizzy driven so there appears to be no difference to the later coil on plug engines. Like I said never actually had a 3B head in my hands so can only pose the question with regards to them, hence the question as opposed to the statement.

[Billman]

Very interesting JP, but how come so many people with modded 7a heads didn't mentioned or noticed low oil pressure?

I will check the adu and the spare 7a head I have. If the squirters don't cure the issue I am going to take it off and plug it with a screw.

[JP]

That black plug is just a simple hole specifically sized to bleed of pressure in the head. The blanking plug I'm referring to is the one in the oil channel. If you go to where the dizzy sits.you will see an oil channel with the shape of the dizzy base cut through it. Get some welding wire and feed it into the groove into the oilway hole towards the cam pulley. You should hit a dead end before you get the first lifter gallery. If you can feed the wire in all the way to the end then there is no blanking.plug in there.

[Billman]

yes, i plugged that hole! I am going to check if i have pictures of the 7A head i am using.

7A engine also has a distributor.... can someone post close up pictures of this area?


i found this also on m/geek off a 3B


I also recall seeing in the middle of the ADU head under the inlet cam some sort of a black plug or valve that I don't recall seeing that in the 7A head. I am gonna try and make pictures in the weekend.

[Jamo]

Not necessarily as the head configuration is different and you may find the engine requires more pressure relief like the diesel does. At the end of the day if you have a pressurised system leaking through a hole the bigger you make the hole the less pressure the system will hold. This is how we used to regulate oil pressure on the YB cossie engines.

Now there is one other thing that could create low oil pressure on a 20v head if using a 3B head but not a distributor. There is an oil channel that the distributor cut out goes through. On the later 20v heads with coil on plug configuration there is a blanking plug pressed into this oilway so it doesn't leak when there is no distributor fitted. This could also be a point of low oil pressure problems too although I've not played with the 3B heads so it is very difficult for me to confirm whether they are also blanked of or left open to feed oil to the distributor. I always seem to end up with 7A ABY AAN ADU heads which are definatelly all plugged.

Interesting that, I'm using an ADU head

Also this http://www.s2forum.com/forum/showpos...39&postcount=5

Has the dowel been placed in point 3?

[RallyQuattro]

But you have the same head in Audi 200 3b that you have in Audi S2 3b and both have distributor.

A200 3b oil squirts 069103157D = same as diesel engine AAS/AAT/AEL
S2 3b oil squirts 035103157B = same as ABY,ADU,AAN engine

S2 3b oil pump = 034115105B same in A200 3b and A100 MC and also same in A100 Diesel AAS engine.
But AAT/AEL diesel have 074115105B oil pump.

[JP]

oil squirters in the AAT/AEL diesel engine part number is 069103157D = the same as in A100 MC engine and A200 3b engine,
if the oil squirters are the problem here, then should A100/200 also have problems with low oil pressure..

Not necessarily as the head configuration is different and you may find the engine requires more pressure relief like the diesel does. At the end of the day if you have a pressurised system leaking through a hole the bigger you make the hole the less pressure the system will hold. This is how we used to regulate oil pressure on the YB cossie engines.

Now there is one other thing that could create low oil pressure on a 20v head if using a 3B head but not a distributor. There is an oil channel that the distributor cut out goes through. On the later 20v heads with coil on plug configuration there is a blanking plug pressed into this oilway so it doesn't leak when there is no distributor fitted. This could also be a point of low oil pressure problems too although I've not played with the 3B heads so it is very difficult for me to confirm whether they are also blanked of or left open to feed oil to the distributor. I always seem to end up with 7A ABY AAN ADU heads which are definatelly all plugged.

[RallyQuattro]

oil squirters in the AAT/AEL diesel engine part number is 069103157D = the same as in A100 MC engine and A200 3b engine,
if the oil squirters are the problem here, then should A100/200 also have problems with low oil pressure..

[Billman]

today i put the washer on the pressure reliev valve and it make a difference of about 0.3 bar at idle. found the oil leak on the crankshaft seal (front). The leaky one came with the new oil pump but it had no spring inside like the Reinz one i installed now.

[Billman]

That would be interesting since others with strokers don't comment on this!

[Jamo]

This is very interesting I don't have these oil pressure issues on my stroker build my hot idle oil pressure flutters between 2-2.2 bar using 10w50 oil.

I wish I could find my order I put into S2avant for which squirters I bought.