Coming up to temp? How long?

[db9146]

On a freshly rebuilt 2.7 S, how long should it take for the engine to reach operating temp (say 180 degrees) if the thermostat is working properly? It seems that even after 15 minutes or more, the engine is still warming and never reached 180 on a 78 degree summer evening.

The temp sending units (there are two, one for the dash gauge and one for the ECU - its fuel injected now with ITBs) display within 5 degrees of each other.

[fanaudical]

Are you driving during that 15 minutes? Or just idling? Do you have an external cooler? Are the lines to the external cooler getting warm before you hit 180F?

My 2.7 with an external cooler does seem to take a while (~20-30 minutes of casual driving), but I have attributed that to having installed the larger oil pump and so the piston squirters are probably moving more oil than originally designed.

[db9146]

No remote cooler, just the one on the engine. Its installed in an original 914-6. And I'm referring to easy driving (up to 3800) to get it warmed up.

I think the thermostat is stuck open which is why I was asking.

[Bill Douglas]

My SC takes about 10 or 15 minutes for the oil to get up to temp. By that I mean single line on the oil temp gauge. The engine may be up to temp sooner but I don't go above 3,000 until the oil is up to temp.

[7783911]

if you need a new tstat, i just rebuilt one on the bench with new internals and bench tested...pm me if you need

[T77911S]

make sure the sending unit is matched to the fuel gauge.

it takes a while but not even a loop oil cooler and your engine should be getting hot if you drive it long enough.

you WILL be looking for a remote cooler once you start driving it harder.

I would try to get a temp reading on the oil filter.

[Targalid]

One of the more useful items you can have for diagnosis of engine function is one of these:
https://www.amazon.com/Etekcity-Lasergrip-1080-Non-contact-Thermometer/dp/B00DMI632G/ref=sr_1_1_sspa?ie=UTF8&qid=1534347651&sr=8-1-spons&keywords=ir+TEMPERATure+gun&psc=1

Uncertainty about the temperature gauge will be quickly cleared up. Also, should you install an auxiliary cooler, it will help you verify proper function.

[theiceman]

that question is like asking how long is a piece of string . Just too many variables.
For example I drive from October to March and it will never hit 180 degrees due to climate conditions.

in august if I start it and hit bumber to bumper traffic with no breeze its about 8 minutes.

[GH85Carrera]

Originally Posted by theiceman

that question is like asking how long is a piece of string . Just too many variables.
For example I drive from October to March and it will never hit 180 degrees due to climate conditions.

in august if I start it and hit bumber to bumper traffic with no breeze its about 8 minutes.

This!

I drove my 911 for well over 90 minutes when it was ZERO Fahrenheit. The temp barley moved off the peg. It is the only time I have ever run the heaters on MAX for more than a few minutes.

In the normal cold of winter, like 40 degrees, it will take a long long time it ever to get to 180. In the dead of summer heat 100 degrees or so, just a few minutes.

In the winter I don't bother to check the oil level. It is impossible to be accurate without a warm or full temp engine.

[RedCoupe]

I never liked the fact that my cars don't get up to normal oil temperature when driven in cool/cold weather. When I lived in the Pacific NW, I used to find water at the bottom of the oil tank when I changed oil on my 964 in the winter. Made me a believer in short oil change intervals when driving under cool/cold conditions. Even though the thermostat(s) are closed under those conditions, the cooling fan is still blowing full blast and that may be too much cooling to let it warm up to normal operating temperature.