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> another oil temp question ...
SirAndy
post Sep 21 2004, 09:09 PM
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sooooo, i decided today to hook up the stock oil-temp gauge (the little one without numbers).

i tested the gauge (werks fine), i tested the wire all the way back to the sender, werks fine too.
i could NOT test the sender itself (duh, it's *IN* the engine right now).

then i took her for a drive, ran some errands, just around town, for about 30 minutes, no freeway or otherwise particular hard driving.

my question is:
what kind of oil temp should i see on a 80 deg. day after 30 minutes cruising around town ???
anyone here who can give me any references? (IMG:style_emoticons/default/confused24.gif)


the needle barely made it about 5mm to the right of the first white stripe.
that would indicate the engine wasn't even up to operating temps.
can this be right??? oh, forgot to mention, the thermostat is removed, full airflow to the oil-cooler at all times.

thanks,
(IMG:style_emoticons/default/smile.gif) Andy
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bernbomb914
post Sep 21 2004, 09:22 PM
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I cant answwer your question but I have one of my own. on the 911 oil pressure guage that has 5 bars how much pressure is there for each bar?

Bernie
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Mark Henry
post Sep 21 2004, 09:38 PM
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I did two 40 min runs today at around 70F outside temp. I do have a T-stat but that shouldn't matter after warm-up


Run #1 was at about 70 to 80 mph and my gauge was 1/3 of the way up.

Run #2 was at about 80 to 100 mph and my gauge was 1/2 of the way up.
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Aaron Cox
post Sep 21 2004, 09:40 PM
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andy, a 30 minute run (my gauge is in the dash 914/6 style with correct gauge model) is barely 5mm above the white line too. and my therm is hooked up (IMG:style_emoticons/default/confused24.gif)
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SirAndy
post Sep 21 2004, 09:55 PM
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QUOTE(acox914 @ Sep 21 2004, 08:40 PM)
andy, a 30 minute run (my gauge is in the dash 914/6 style with correct gauge model) is barely 5mm above the white line too. and my therm is hooked up (IMG:style_emoticons/default/confused24.gif)

ok, good ...

so, i guess i should take her on the freeway and get her warmed up and see what kind of temps i get then.

shanks a lot,
(IMG:style_emoticons/default/pray.gif) Andy
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smg914
post Sep 21 2004, 10:26 PM
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Andy,

You didn't specify which temp gauge you are using; The '73 gauge with the larger red zone or the '74 and later gauge with the smaller red zone.

I'm going to assume you are using the gauge with the larger red zone in combination with the 200C sender. If the needle moved 5mm, that would be approximately 200 degrees.

Seem about right for a rather hot day driving around town with a modified 914 engine.
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phantom914
post Sep 21 2004, 10:26 PM
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Andy,

My cooling flaps are stuck open and it seems to take a full hour of driving for the temp to get to its final level.

Andrew
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tiim5
post Sep 21 2004, 11:42 PM
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Sorry to be kinda off topic, I want to install a 2.0 console in my 73' 1.7. What sending unit/plate do I need for oiltemp and or cyl. head temp? Where Can I get them? Thanks, sorry for highjacking.
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Bleyseng
post Sep 22 2004, 07:40 AM
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That stock oil temp sender and taco plate work well. See if HPH has any.
The CHT gauge uses its own bimetal sender under the spark plug.
Geoff (IMG:style_emoticons/default/biggrin.gif)
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Demick
post Sep 22 2004, 08:33 AM
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All of the talk about 1/3 or 1/2 of the way up the gauge or 5mm from this white line etc is pretty useless. What you need to know is what the actual temperature of the oil is. With 30 year old gauges and senders that have been mixed and matched in a variety of ways, there is no way of knowing what the temp is unless you correlate it to real oil temps.

Easiest way is if you have an infrared temperature sensor. Shoot it directly at the sump screen plate for an accurate measurement of your oil temp. Do this for a variety of indicated temps on your gauge. Then you will know what temp corresponds to the indicated levels on the gauge.

If you want, you can even take apart your gauge and label it (although not so easy with a center console gauge).

Demick


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Rockaria
post Sep 22 2004, 08:37 AM
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QUOTE(bernbomb914 @ Sep 21 2004, 09:22 PM)
I cant answwer your question but I have one of my own. on the 911 oil pressure guage that has 5 bars how much pressure is there for each bar?

Bernie

1 bar = 14.5 psi
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DNHunt
post Sep 22 2004, 08:41 AM
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Demick

That is really cool. I get temp ranges like Andy but I want to be a little more precise with the new engine since I'll be on the edge of needing a remote cooler. Your solution looks great.

Dave
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machina
post Sep 22 2004, 08:50 AM
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This has been covered before but...

The outer edge of your gauge has numeric markings in deg C. Get to know your gauge and where the motor runs. Or you can buy or make a new gauge face.


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Demick
post Sep 22 2004, 08:55 AM
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Very scary that Porsche considers the red line for oil temp to be 300F!!

Demick
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machina
post Sep 22 2004, 09:00 AM
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QUOTE(Demick @ Sep 22 2004, 10:55 AM)
Very scary that Porsche considers the red line for oil temp to be 300F!!

The start of the red area is really around 270. Still way too high.

Jake posted this a few weeks ago. I of course saved it.

"180-225 is perfect..

225-245 is very warm and will require oil changes more frequently as it heats up the oil and breaks it down faster

250+ is very hot- Shut her down unless you have a pressure gauge and can ensure that you still have atleast 40 pounds of operating pressure.

Hot oil is thin oil... thinning out the oil is what spins bearings and wears parts.

Oil temps are directly related to RPM and ambient air temps."

enjoy (IMG:style_emoticons/default/biggrin.gif)
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Joe Bob
post Sep 22 2004, 09:53 AM
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QUOTE(tiim5 @ Sep 21 2004, 09:42 PM)
Sorry to be kinda off topic, I want to install a 2.0 console in my 73' 1.7. What sending unit/plate do I need for oiltemp and or cyl. head temp? Where Can I get them? Thanks, sorry for highjacking.

If you are looking to use the smaller VDO gauges in the center console....it's best to buy a NEW gauge with the matching sender. The new gauges are slightly smaller than the ones from the 70s, but the reducer rings fit very well and are not noticeable from the casul observation....

The older stock gauges did not come with numbers and are worse than worthless.....
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BMartin914
post Sep 22 2004, 03:12 PM
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I had a similar question when I first got my car.

The gauge was almost pegging with normal driving conditions. Found out from the PO that the sender is a low temp -- pegs at 230'

Your sender type is a very integral part of the oil temp gauge. I would check it out to make sure your gauge and sender match.

Ben
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larryM
post Oct 12 2004, 10:05 PM
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a lo-o-o-ng while back Panorama had an article on the 3 different gages & sender units in 914/4's using the single vdo gage that mounted in the center console, which included actual temps for each combination of gage & sender

I have a copy of the article stored away; i'll try to get it into image format to share if anyone wants it
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ThinAir
post Oct 12 2004, 10:11 PM
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That Pano article would be very helpful.
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Joseph Mills
post Oct 12 2004, 11:15 PM
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QUOTE(SirAndy @ Sep 21 2004, 09:09 PM)
i could NOT test the sender itself (duh, it's *IN* the engine right now).

my question is:
what kind of oil temp should i see on a 80 deg. day after 30 minutes cruising around town ???

anyone here who can give me any references?  :confused:
oh, forgot to mention, the thermostat is removed, full airflow to the oil-cooler at all times.

I have a 2.0 with Euro P/C, hot cam & carbs. No thermo and full air to cooler. I just installed a new sensor & gauge.

30-60 minutes cruising around town, stop and go combined with some spirited pulls (IMG:style_emoticons/default/biggrin.gif) I'm seeing 180 to 200 on my gauge.

It's comforting to know what the oil temps are. However, I plan to fit a head temp gauge soon.

If you don't want to spend for a new sensor and indexed gauge, you have an alternative. But you already know this. (IMG:style_emoticons/default/biggrin.gif)

Next oil change, pull the sensor, do the drill with hot water, etc. confirm and calibrate readings and mark your gauge.

Either way, you'll feel better! (IMG:style_emoticons/default/beer.gif)
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