What oil temp Temperature gauge do I trust, Just installed the new Pressure & CHT guages |
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What oil temp Temperature gauge do I trust, Just installed the new Pressure & CHT guages |
jc914 |
Nov 13 2008, 09:00 PM
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#1
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Member Group: Members Posts: 289 Joined: 15-September 08 From: Miami, Florida Member No.: 9,548 Region Association: South East States |
I just finished cleaning all the inside glass of all my gauges (what a difference they look NEW) So I toke her out in the Miami weather tonight the outside temp was a nice hot 80 degrees. I drove my 914 for over an Hour an Half I drove her really hard and fast up 80MPH:driving: . The OEM temp gauge only read a 1/4 up and it never even got half way up (IMG:style_emoticons/default/piratenanner.gif) . Once I got home I opened the engine lid and the Dip stick Temp Gauge read 250 degrees. ( note i have checked the dip stick boiling point yesturday before i installed it.) If My 914 is running hot what what might be the causes and which gauge should i trust. (IMG:style_emoticons/default/devil.gif) (IMG:style_emoticons/default/confused24.gif) (IMG:style_emoticons/default/confused24.gif) (IMG:style_emoticons/default/confused24.gif) (IMG:style_emoticons/default/confused24.gif)
The car idled at 1 the whole night when i got home i turned her of and then on again after like 5 minutes and it started with some gas on the peddle. thanks JC |
Dave_Darling |
Nov 13 2008, 11:25 PM
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#2
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914 Idiot Group: Members Posts: 15,048 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Check the dipstick gauge against boiling water. That'll tell you if it is trustworthy...
--DD |
jc914 |
Nov 14 2008, 07:38 AM
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#3
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Member Group: Members Posts: 289 Joined: 15-September 08 From: Miami, Florida Member No.: 9,548 Region Association: South East States |
Thank DD i had already done that before I installed the dip stick. is 250 degrees to hot
JC |
Ferg |
Nov 14 2008, 08:55 AM
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#4
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914 Guru Group: Members Posts: 5,948 Joined: 8-January 03 From: Boulder CO Member No.: 116 Region Association: None |
I'd wager that you have the stock gauge with the bigger red zone... if so it was most likely reading correct.
Trust the dipstick gauge, I have used one since they were available and it opened my eyes as to how hot stock cars run. I'm not surprised you saw 250. Too hot? Most likely, head temps ect all come into play, but in the end, I'm a believer that second cooler is a smart thing. You may be able to get the temps down with tuning ect, but I think they all run warmer than owners want to believe. Ferg |
Gint |
Nov 14 2008, 09:21 AM
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#5
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Mike Ginter Group: Admin Posts: 16,093 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains |
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jc914 |
Nov 14 2008, 09:28 AM
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#6
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Member Group: Members Posts: 289 Joined: 15-September 08 From: Miami, Florida Member No.: 9,548 Region Association: South East States |
Thanks for helping (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/mueba.gif) . I am going to give the car a full tune up next month. I hope this will bring down the temp. I am also going to buy a CHT gauge. Most likely the VDO I know the are not temp compensated but for the price I rather do the math to compensate the temp. I also want to keep my gauges looking the same.
JC |
jim_hoyland |
Nov 14 2008, 09:38 AM
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#7
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Get that VIN ? Group: Members Posts: 9,418 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
Ferg is right; the dip stick gauge is pretty accurate. I used one to verify my sender and gauge were properly matched.
If thesender is in question, you can remove it from the case and did it into boiling water. That will tell you where 200-212 is on that gauge. If you pull the sender, be sure to use a new crush washer when it's replaced. Attached image(s) |
Ferg |
Nov 14 2008, 09:50 AM
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#8
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914 Guru Group: Members Posts: 5,948 Joined: 8-January 03 From: Boulder CO Member No.: 116 Region Association: None |
For those who are wondering what a dip stick gauge is, I'll throw out a free plug for the vendor as he is a good one...
http://www.mainelycustombydesign.com/engin...s.html#dipstick Also it reads temp right where the stock sender does, (if' you've ever had the temp sender plate off you can see the bottom of the dipstick) so the temp readings are taken from the same location. I used the dipstick gauge to give me real time readings from the stock gauge in the car... After a few drives and stopping to check the dipstick gauge, you can see where the stock gauge is, and get a idea of what the non numbered gauge is telling you. One warning though, it will make you nervous, as I could not believe how hot "normal" was on the stock gauge. Straight up and down, on the gauge with the small red zone is right about 215, if the needle is touching the "M" on the word TEMP you are 235-240ish and if you are on the P it's 250 and above, all below the red zone. Ferg |
ericread |
Nov 14 2008, 10:01 AM
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#9
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The Viper Blue 914 Group: Members Posts: 2,177 Joined: 7-December 07 From: Irvine, CA (The OC) Member No.: 8,432 Region Association: Southern California |
Thanks for helping (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/mueba.gif) . I am going to give the car a full tune up next month. I hope this will bring down the temp. I am also going to buy a CHT gauge. Most likely the VDO I know the are not temp compensated but for the price I rather do the math to compensate the temp. I also want to keep my gauges looking the same. JC You are on the correct path. Who cares what the oil temperature is telling you? By the time the oil temp is recorded at the high point, it's proably going to be too late to save your engine. The important measurement is the CHT. I purchased a compensating CHT, cylinder probe and wiring for under $100.00 at Aircraft Spruce. In the past couple of months, I find that my oil temp gauge matches up to the CHT gauge reading- after about an hour. As for temp cool down, the oil temp gauge provides no real help. If you're worried about your engine temp, go for the compensating CHT. Eric Read |
jc914 |
Nov 14 2008, 10:55 AM
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#10
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Member Group: Members Posts: 289 Joined: 15-September 08 From: Miami, Florida Member No.: 9,548 Region Association: South East States |
Ferg thanks for the great information on the gauge. One more question I just replaced the wire from the temp sender to the engine bay conector when o got my above reading . Would the length of the wire changed the temp reading.
JC |
Ferg |
Nov 14 2008, 11:03 AM
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#11
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914 Guru Group: Members Posts: 5,948 Joined: 8-January 03 From: Boulder CO Member No.: 116 Region Association: None |
Ferg thanks for the great information on the gauge. One more question I just replaced the wire from the temp sender to the engine bay conector when o got my above reading . Would the length of the wire changed the temp reading. JC I don't think so, but someone will correct me if I'm wrong. Do you have the stock gauge with the big red zone starting just past midway, or the later with the small red on the far right... My findings are from the later gauge, I've never owned a car with the "big red zone" gauge. Ferg |
jc914 |
Nov 14 2008, 11:05 AM
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#12
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Member Group: Members Posts: 289 Joined: 15-September 08 From: Miami, Florida Member No.: 9,548 Region Association: South East States |
I have the one with the BIG red zone. Thanks
JC |
type47 |
Nov 14 2008, 01:10 PM
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#13
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
i have the dipstick gauge installed in my 1.8 and the highest temp i've observed is 210F.
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jc914 |
Nov 14 2008, 08:27 PM
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#14
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Member Group: Members Posts: 289 Joined: 15-September 08 From: Miami, Florida Member No.: 9,548 Region Association: South East States |
I just toke her out for another ride of about forty five minutes stopping and looking at the temp on the dip stick it ranged from 220-250 250 being the max i got and no matter how hard i would drive it would it did not go any hire than 250. Tomorrow i am going to clean the oil cooler with brake cleaner, check the fan and make sure there is nothing blocking it and later in the week i am going to do an oil change ( have to admit the oil is really old like 4 years only have ran like 1,000 miles I know shame on me (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/chair.gif) (IMG:style_emoticons/default/behead.gif) ) I hope this will bring done the temp at least to 220 at its highest point.
I have been looking at the CHT i think i am going to change my mind and go with the Dakota I just cannot see my self driving looking at the gauge and doing some math in my head to get the CHT degree from the VDO For those of you that have a temp gauge with the big red zone this is what I used on the stock gauge to correlate to the dip stick gauge. When the top of the needle passed the top Tip left of the T (on the temp word) i had 220 from the dip stick. When the needle got to almost the tip of the end of the T i had 250 on the dip stick. |
Ferg |
Nov 14 2008, 08:46 PM
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#15
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914 Guru Group: Members Posts: 5,948 Joined: 8-January 03 From: Boulder CO Member No.: 116 Region Association: None |
I'm not trying to be a downer, but I speak from some experiance, as I've had a few 914's...
220 as a high point in your climate and highway driving is very optomistic without a second cooler, and impossible in the summer. I'm hoping you find blockage (check your warm up flaps too) but the temps you are seeing are exactly what I have seen with all my 2.0's before a aux cooler. Ferg |
jc914 |
Nov 14 2008, 08:52 PM
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#16
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Member Group: Members Posts: 289 Joined: 15-September 08 From: Miami, Florida Member No.: 9,548 Region Association: South East States |
FERG Thanks for your honesty I am considering a second cooler where can i buy one I am really thinking about it
JC |
Gint |
Nov 14 2008, 08:56 PM
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#17
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Mike Ginter Group: Admin Posts: 16,093 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains |
I'm not trying to be a downer, but I speak from some experiance, as I've had a few 914's... 220 as a high point in your climate and highway driving is very optomistic without a second cooler, and impossible in the summer. I'm hoping you find blockage (check your warm up flaps too) but the temps you are seeing are exactly what I have seen with all my 2.0's before a aux cooler. Ferg Bah! Hot-schmot! My /4 has no temp gauge of any kind. I borrowed Ferg's Mainley dipstick thermo once. Saw 230-240. "That's a little high." Pulled that sucker out and gave it back to Ferg. Twisted the key and dumped the clutch and throttle and never looked back. (IMG:style_emoticons/default/driving.gif) That was a year or so ago (maybe more?). Drive it like you stole it! |
Ferg |
Nov 14 2008, 09:02 PM
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#18
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914 Guru Group: Members Posts: 5,948 Joined: 8-January 03 From: Boulder CO Member No.: 116 Region Association: None |
I'm not trying to be a downer, but I speak from some experiance, as I've had a few 914's... 220 as a high point in your climate and highway driving is very optomistic without a second cooler, and impossible in the summer. I'm hoping you find blockage (check your warm up flaps too) but the temps you are seeing are exactly what I have seen with all my 2.0's before a aux cooler. Ferg Bah! Hot-schmot! My /4 has no temp gauge of any kind. I borrowed Ferg's Mainley dipstick thermo once. Saw 230-240. "That's a little high." Pulled that sucker out and gave it back to Ferg. Twisted the key and dumped the clutch and throttle and never looked back. (IMG:style_emoticons/default/driving.gif) That was a year or so ago (maybe more?). Drive it like you stole it! (IMG:style_emoticons/default/poke.gif) spend a week and drive up I70 and get back to me (IMG:style_emoticons/default/laugh.gif) Your results may vary. (IMG:style_emoticons/default/popcorn[1].gif) Ferg |
jc914 |
Nov 14 2008, 09:12 PM
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#19
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Member Group: Members Posts: 289 Joined: 15-September 08 From: Miami, Florida Member No.: 9,548 Region Association: South East States |
OK I will THANKS AGAIN FERG
JC |
ericread |
Nov 14 2008, 09:12 PM
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#20
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The Viper Blue 914 Group: Members Posts: 2,177 Joined: 7-December 07 From: Irvine, CA (The OC) Member No.: 8,432 Region Association: Southern California |
220 as a high point in your climate and highway driving is very optomistic without a second cooler, and impossible in the summer. I'm hoping you find blockage (check your warm up flaps too) but the temps you are seeing are exactly what I have seen with all my 2.0's before a aux cooler. Ferg When you get your CHT installed, you will probably begin to see real engine temps - please see Jake Raby's article for reference: http://www.914world.com/specs/JakeRabyHeadTemps.php Eric Read |
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