[urq] URQ quirqiness

[DGraber460 at aol.com]

In a message dated 5/2/2006 8:56:55 A.M. Mountain Daylight Time,  
tlum at flash.net writes:

Hi  Dennis,

Unfortunately I've just seen this last week on Al Keen's 034efi  fueled MC-1 
engine.  Looked like a plasma cut tunnel between #4 and  #5.  A friend of Jeff 
Lewis welded up the tunnel to get it ready for  machining but on closer 
inspection, the camshaft bearing next to the  distributor looks like it suffered 
oil starvation and appears to be  ruined.

Why this had happened is unknown as this was a freshly rebuilt  engine that 
had dyno'd at 199 WHP.  The failure occurred during a tuning  run and a timing 
parameter may have been set too "hot" (i.e.  detonation).  We also theorize 
that cooling at the back of the head is  inadequate for the boost being run.  
Phil Payne wrote that that there is  a tendency for cylinders 4 and 5 to run 
lean and damage usually occurs  here.

Tony


= = = Original message = = =

In a message  dated 4/29/2006 5:08:39 P.M. Mountain Daylight Time,   
audi at humanspeakers.com writes:


>  Pull the compression  gauge out and to my horror #4 & 5  don't  
> even bounce  the gauge. NOTHING!

Although I am not really  offering much of a  solution, such bizarre 
measurement results prompt me to  suggest  rechecking, just in case 
something about the test setup was   awry.

-- 
Huw   Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/
_______________________________________________



Well  the head is off and the verdict is in.
Cylinder's 4 & 5 had a huge  breach between them. Not only was the  gasket 
burned through, the  head has a valley burned through about a 1/2"  wide and 
almost an  1/8" deep. Cylinder 5 is clean as a whistle, and the breach  is 
shiny  
aluminum.
I can't see how this could happen in 3 miles. The car ran  fine until the  
last 3 miles, and it hadn't been run hard for some  time! The head is  
ruined. It 
would probably be prudent to deck the  block to be certain of a good  seal 
before installing another  head?
I've never seen anything like this. This looks more like an  endurance  race- 
many laps at red line type of  failure!



Dennis 
Denver



You described perfectly what I found. Can the head be  "welded/built-up" and 
repaired?
I also have a spare cam that has the rear bearing looking somewhat haggard,  
but thought it was due to hard braking track time oil starvation on that  
motor.
The motor I am dealing with now has no recent track time on it, and in fact  
no full red-line multiple gear pulls to speak of.
Any remedies for any of this stuff? 

 
Dennis 
Denver