Lower coolant temps

[chriscoates81]

Hi guys I notice there are a few coolant threads that pop up now and again, and i wondered if there are any benefits to have a lower temperature. In my car I would say it runs at around 85 Deg C when its fully warmed up but I dont know if this is the 'standard' temperature or not.

Cheers

Chris

 

[Richard_Hamilton]

Your temperature sounds about right to me.

The posts you have seen are probably about the lower temperature thermostat, which is sometimes recommended for the 3.6 996 engines (also 997 3.8's and 987 3.4's). My interpretation of the problem with these engines is that the cooling water path is quite narrow around the cylinder liners. This can lead to local boiling during the warm-up cycle, and ultimately cylinder liner scoring due to ineffective cooling at these points. Because cylinders 5 & 6 are at the end of the water flow path, they are the ones most usually affected. Fitting a lower temperature thermostat means that it will open sooner, so the water starts circulating past the hot spots earlier.

We all know it, but careful warm-up is the order of the day. Avoid loading the engine, as higher torque will increase piston side-loading, and the contact pressure on the liner. Keep the revs down too.

On your car, Chris, it doesn't have the same issue.

 

[Motorhead]

ORIGINAL: Richard Hamilton

The posts you have seen are probably about the lower temperature thermostat, which is sometimes recommended for the 3.6 996 engines (also 997 3.8's and 987 3.4's). My interpretation of the problem with these engines is that the cooling water path is quite narrow around the cylinder liners. This can lead to local boiling during the warm-up cycle, and ultimately cylinder liner scoring due to ineffective cooling at these points. Because cylinders 5 & 6 are at the end of the water flow path, they are the ones most usually affected. Fitting a lower temperature thermostat means that it will open sooner, so the water starts circulating past the hot spots earlier.

One hopes, Richard, that this is something which has been addressed by Porsche in the current Gen II engines.

By the way, can you confirm - or otherwise - that Porsche have now moved away from the Lockasil process to an Alusil process for the cylinder blocks on these engines?

Jeff

 

[thirteeneast]

The amount of people I hear reving there engines off load.

Yes a Porsche sounds good but doing that is guna break it.

Off load = BAD.

 

[Richard_Hamilton]

ORIGINAL: Motorhead
One hopes, Richard, that this is something which has been addressed by Porsche in the current Gen II engines.

By the way, can you confirm - or otherwise - that Porsche have now moved away from the Lockasil process to an Alusil process for the cylinder blocks on these engines?

Jeff

I have read that somewhere, but I can't think where. The crankcase has a closed deck, so that would help stop the liner ovalling and 'D' chunk failures.