Little bit of common sense info

[David Oxland]

http://list.priceweber.com/cummins/summer.html

 

[Radman]

Thanks David, for posting that link. Common sense for sure. Was a bit surprised with the cooldown answer however.

Thanks!

 

[rowilson]

Thanks David, for posting that link. Common sense for sure. Was a bit surprised with the cooldown answer however.

Thanks!

The only real reason for a cool down is so that the oil trapped in the turbo doesn't coke the bearings. This is of course if you still use dino oil. If you use synthetic this problem is almost none existant. We saw this problem years ago with the Buick Grand Nationals turbos getting detroyed. Most everyone finally saw the light a switched to synthetic and the turbo failure rate dropped like a rock. I would still let the truck idle after an extended haul under boost like the site says. This would just let everything normalize.

 

[David Oxland]

Rob

I think you're very right about the word "normalise" It used to be the practice in some medium speed engines continue cooling the engine with external pumps until the temp had dropped to an acceptable level say 100F; A Wise old Chief Eng told me that a far better practice was to stop the salt water interface and continue circulating the Jacket Water letting all the rest of the materials in the machine equalise. After that stop the circulation and just let the engine settle down on it's own. I think that people don't realise how little mass there is in a turbo rotating element when they speak about cooling when the real target is to get the surrounding turbo casting which carries the oil reservoir , if equipped, cooled down. As you say the synthetics are probably a good solution in this respect.