Porsche Club GB

Lower coolant temps

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YOUR RESEARCHLower coolant temps

Leading reported evidence

Recommend 3.6 996 engines (also 997 3.8's and 987 3.4's)

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Suggestion
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).
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Lower coolant temps

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Leading evidence: 'Recommend 3.6 996 engines (also 997 3.8's and 987 3.4's)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Recommend 3.6 996 engines (also 997 3.8's and 987 3.4's)' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Recommend 3.6 996 engines (also 997 3.8's and 987 3.4's)

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
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).
Original post Read captured discussion
Lower coolant temps

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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Porsche Club GB: 1 discussions

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POST 1 / ORIGINAL POSTEROriginal post

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

POST 2Original post

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.

POST 3Original post

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

POST 4Original post

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.

POST 5Original post

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.

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