|
|
|
|
| Author |
|
|
Registered
Join Date: Oct 2000
Location: Sherwood, Oregon
Posts: 2,119
|
Temp Wizards ?
Were can I get a temp reading with a digital lazer thermometer in the engine compartment, to compare it to the dash gauge ?
TIA ------------------ Cary Kutter 77 Euro Carrera w/3.2 PCA Region - Big Sky |
||
08-14-2001, 11:08 AM
|
|
|
Registered
Join Date: May 2001
Location: North Port, FL
Posts: 342
|
Not a wizard, but wouldn't the intake oil line (oil tank to engine) line be the most appropiate? The oil temp is measured just just after the oil pump so this is as close as I could get to the same temp outside the engine. you can probably measure the line where it meets the oil tank.
Then I could have it all wrong. ------------------ Ted Stringer nuke3@juno.com '84 911 Targa aka pocketrocket |
||
|
08-14-2001, 12:21 PM
|
|
|
Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,334
|
I've gotten pretty consistent readings between a shot at the engine block and the thermostat. You'll get very depressed if you take your readings off of the exhaust.
------------------ Jack Olsen My Rennlist page • My Pelican Gallery page • My Porsche Owners Gallery page |
||
|
08-14-2001, 12:51 PM
|
|
|
Registered
Join Date: Dec 2000
Location: Winter Haven, FL usa
Posts: 929
|
I asked the same question a couple of weeks ago- check http://www.pelicanparts.com/ultimate/Forum3/HTML/010996.html
Unfortunately I learned that the oil temp readings we will get off the oil filter and other lines are probably not accurately measuring the same temps as the dash gauge. When my dash gauge measures 225, my oil filter and oil lines only measure about 200 |
||
|
08-14-2001, 03:12 PM
|
|
|
Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
|
cary,
I have mentioned this before, but there is an oil gallery that your temp sensor is sticking into ... that you can't get to with an external probe of Infrared temp. gun ... and it is natural to have a declining temperature gradient through the crankcase walls, since they are exposed to moving airflow, and are cooled by radiation! There is even a gradient inside the oil gallery, where cooler oil next to the walls tends to thicken slightly and not move along the oil gallery with the rest of the flow! ------------------ Warren Hall 1973 911S Targa 1992 Dodge Dakota 5.2 4X4 parts hauler |
||
|
08-14-2001, 03:30 PM
|
|
|
Registered
Join Date: Oct 2000
Location: Sherwood, Oregon
Posts: 2,119
|
Jack, the ground issue that you discussed on gchappel's post above. Did you every figure it out ?
My 77 does the same thing. Turn the key off and the gauge reads about a needle and 1/2 less. Thats after the 85 3.2 conversion and a new engine ground strap. I run at about 100c. Which is good. But I'd like to be at 90c. I thought the new ground strap would cure it. But it didn't. ------------------ Cary Kutter 77 Euro Carrera w/3.2 PCA Region - Big Sky |
||
|
08-14-2001, 03:36 PM
|
|
|
|
Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
|
cary,
Your electrical system is at a different Voltage when the engine is turned off ... typically 1 Volt lower! That DOES make a difference in the reading of your temp. gauge, as it is a simple analog Voltmeter, reading what a voltage divider circuit feeds to it ... lower system Voltage equals lower temp reading! ------------------ Warren Hall 1973 911S Targa 1992 Dodge Dakota 5.2 4X4 parts hauler |
||
|
08-14-2001, 04:05 PM
|
|
|
Registered
Join Date: Oct 2000
Location: Sherwood, Oregon
Posts: 2,119
|
Warren, I haven't seen anyone ask.
Is the temp gauge calibrateable ? Or could you send it in along with the sender to be verified ? At least you'd know want your variance was. ------------------ Cary Kutter 77 Euro Carrera w/3.2 PCA Region - Big Sky |
||
|
08-14-2001, 04:09 PM
|
|
|
RETIRED
|
I have found shooting the oil tank or a recently pulled oil dip stick with a pyrometer will give you an accurate temp reading.
The pyrometers are available from Summit Racing. |
||
|
08-14-2001, 04:31 PM
|
|
Da cab
