Opinion for 91 200 Quattro

[quk@sievers.com (Phil Payne)]

In message <Pine.OSF.3.91.970508002433.19358B-100000@lynx.dac.neu.edu> David Tong writes:

> Thanks for every one who replied to my original message. One of the 
> replies stated I should see 1.8 bar on the turbo when accelerate hard in 
> 3rd gear. I drove the car again today and I was only seeing 1.6 bar in 
> third gear. Do you think it could be possible that the reading can be 
> -.2 incorrect? The car has a leaky crank seal but the guy said it is OK 
> with this car and change the original seal will actually make things 
> worst. He said this is what an Audi master mechanic told him. Do you 
> think he is BS or it is the fact? If everything goes well I should be a 
> proud Quattro owner by Fri.

a) I would expect a stock 1991 car to boost at 1.6 - Audi lowered boost levels
   and raised compression across its engine range between 1988 and 1990.
 
b) Changing the oil seal will make things _worse_?  So taking it out completely
   will make them better, n'est pas?  BS.  It's a source of unmetered air, and
   leads to the air/fuel volume curves being mismatched when they are set 
   at idle.  Your closed-loop OXS controls will partially compensate, but 
   not completely.  The engine should be tight.

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club