| Re: [GMCnet] Oil cooling insight [message #324762 is a reply to message #324753] |
Mon, 09 October 2017 16:38   |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
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Senior Member |
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Hal,
Could you please advise:
1) What type of radiator do you have in your Diesel coach; OEM or Aluminum?
2) What was blocked - oil flow or cooling water flow?
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Hal StClair
Sent: Monday, October 9, 2017 1:36 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Oil cooling insight
I ran into an interesting observation with engine cooling and the effects of oil temperature. On our Diesel swap I'd by passed the
radiator cooling heat exchanger for a couple of reasons. First was because the cooler blocked much of the lower radiator flow which
is a real no no with the 6.5 TD. GM went to great lengths to improve H2O flow in 1997 with dual thermostats revised water pump and
flow. I didn't want to impair the flow so I crushed the
cooler to gain area for H2O. I then added a large air to oil heat exchanger in front of the cooling stack (radiator, charge air
cooler). The oil temps seemed to run higher than I liked in hot weather pulling long grates, approaching 250 degrees. I run Rotella
full Synthetic so the temps are in line but more than I like. Anyway, I recently added an additional oil cooler in line with the
first cooler. As space is getting to be at a real premium up front, I mounted it in the drivers side wheel well behind the brake
prop valve. It has a 12 volt fan behind it thermostatically controlled. I added an oil thermostat after this cooler (I know, a
little unconventional).
The results have been nothing short of amazing. I know oil plays a huge part in cooling our engines but didn't expect such a
dramatic change.The H2O temps never moved off the stats 195 degree setting and the oil never exceeded 210 (200 degree stat) and the
12 volt fan never came ran on the aux oil cooler. This was with an ambient temperature near 95.
Couldn't be happier with the results and very surprised.
Hal
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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