[DeTomaso] #9261 is back on the road - short luck

[Tomas Gunnarsson]

Jørn,

Some thoughts: 150 F is on the low side. You want the oil to be around 80-90 C (180-200 F) minimum. Are you using a thermostat with the oil cooler? A high volume pump will not help overcome the resistance of the long oil lines. A high pressure pump will. 5 bar is normal at elevated rpm, 2.5 bar is normal at idle. Is it possible that your oil cooler got clogged up? Did you loop around the cooler at the front of the car or at the engine? Try bypassing the oil cooler but keep the oil circulating through all the long oil lines. This will show if the long lines are the problem or the oil cooler element. At these oil temps the fact that you're using mineral oil instead of synthetic does not explain the phenomenon.

Tomas

----- Original Message ----- 
From: "Jørn C. Olsen" <joernco at online.no>
To: <detomaso at realbig.com>
Sent: den 11 juni 2006 23:03
Subject: [DeTomaso] #9261 is back on the road - short luck


Need some advice!

On my new setup i used a standard oil pump(not high volume) because my enginebuilder wanted to reduce the stress om the distributor axle.  Installed a MSD Pro Billet distributor and MSD 6A. Also installed a oil lamp with "early warning", triggers at about 2,5 kg.  Filled Kendall 20/50 mineral oil.
In the enginedyno and the first and second trip in the car, nearly 5 kg oilpressure.
Third trip, dropped to 2,5 - 3 kg and stayed there all the time with the oil lamp flashing like a disco light.
Oil temperature at maximum 150F.
Went to my enginebuilder with the car and he looped the oil away from the oilcooler and the pressure went up again to 4-5 kg.  Drove (not hard) home with the car and the oil temp went up to 220-230F and the pressure dropped to 2,5 kg again but only on idle. My enginebuilder say we have to install an high volume oil pump again because of the long travel distance from the engine to the oilcooler in front.  He also says i have to use a better oil because of the heat.  I had none of this problems with my previous setup, steady oil pressure at 4 - 4,5 kg, but i used syntetic Castrol Racing oil,
New test drive today and when the engine and oil got hot, a bang and the engine went dead.  Waited to the engine went cold again and it fired up again.  Came nearly home and the same thing happend again.  Towed it home and now it wont start up again at all.  Am I looking for two separat problems or is it the caused by the same?  Oil pump, distributor, MSD box?  The fact that I had good oil pressure the first and second trip confuses me!

For me, i need Prosac!!!!!

J.C.
  
  ----- Original Message ----- 
  From: Jørn C. Olsen 
  To: detomaso at realbig.com 
  Sent: Tuesday, May 09, 2006 8:58 PM
  Subject: #9261 is back on the road after 2 1/2 year in the garage


  I took my first trip with it today with a big smile in my face!
  The engine felt strong!

  J.C.
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