Aces High Bulletin Board
General Forums => The O' Club => Topic started by: Gunslinger on July 03, 2005, 12:15:17 PM
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This is for anyone who knows or specifically anyone who is mechanicly inclined and owns a jetta.
My brother has an older one, not sure what year but it's probably at least 5 years old and has 110,000 miles on it. It's in great condition and it's a V-6.
Ok with all the pertinant info out of the way:
Is it bad if is engine oil temp runs at 236 degrees if his coolent temp stays below 210?
This is without running the air conditioner in high desert temps under normal driving conditions to include highway.
He's concerned he's running his engine too hot and it's my asertion that as long as his water isn't hot or boiling over he's fine. In addtion he has allready changed out the thermostat and did a flush and fill on the radiator.
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The coolant temp is a bit high. You should try to keep it as close to 180 degrees F as possible. Higher temps mean you have to rely more and more on pressure holding to keep it from boiling.
It may be the case that the oil cooler is a bit clogged up or blocked from airflow. How long has it been since the oil was changed? What is the oil pressure? Does either temp change or do they hold steady?
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Originally posted by Maverick
The coolant temp is a bit high. You should try to keep it as close to 180 degrees F as possible. Higher temps mean you have to rely more and more on pressure holding to keep it from boiling.
It may be the case that the oil cooler is a bit clogged up or blocked from airflow. How long has it been since the oil was changed? What is the oil pressure? Does either temp change or do they hold steady?
He changes his oil regularly. I'm not sure if it even has an oil cooler (ignorant on the ways of the jetta) but I've reccomended he look into an after market one. The temps stay pretty regular. The water temp of 200-210 isn't all that uncommon in cars out here were we regularly see triple digit temps. My jeep runs at 205 in the summer.
I'm pretty sure the oil pressure is constant/normal as well otherwise he would have mentioned it.
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Have zero experience with a Jetta, but those temps look a bit on the high side to me. If it doesn't have an oil cooler, get an aftermarket one quick. Besides thermal breakdown of the oil, gaskets, seals, hoses, ect., don't take well to long periods of high heat.
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Neither of those temps is terribly out of line. Both are SLIGHTLY high. I'd prefer to see 195 or so on the water and 210 or so on the oil. You might consider having the cooling system flushed and checked thoroughly. Also switch to a good quality pure synthetic oil, they perform and protect better at high temperatures.
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well thanks guys I'll relay this to my brother.
From what he told me this is the stock engine but they put in a space that was ment for a 4cyl. Its almost a strait 6 but the cylininders are slightly offset.
I'll recomend an aftermarket cooler
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Originally posted by Gunslinger
Its almost a strait 6 but the cylininders are slightly offset.
GS,
I've had two cars with that same engine. The 2.8i V6. Although it's a V6, there's only one cylinder head, and the cylinders are arranged in a 15° V.
My temperature readouts were in Celsius, but the coolant temperature would always be a constant 90°C (about 195°F). In normal driving, the oil would be 96°C. But in high speed driving (140mph/225km/h on the German autobahn) the oil temp would rise to 112°C! That's almost the 236°F that your brother is getting in normal driving, and seems rather high to me. Even driving flat out with 5500rpm, I never quite ran the oil as hot as your brother is doing.
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Originally posted by beet1e
GS,
I've had two cars with that same engine. The 2.8i V6. Although it's a V6, there's only one cylinder head, and the cylinders are arranged in a 15° V.
My temperature readouts were in Celsius, but the coolant temperature would always be a constant 90°C (about 195°F). In normal driving, the oil would be 96°C. But in high speed driving (140mph/225km/h on the German autobahn) the oil temp would rise to 112°C! That's almost the 236°F that your brother is getting in normal driving, and seems rather high to me. Even driving flat out with 5500rpm, I never quite ran the oil as hot as your brother is doing.
thanks alot Beetle. On his way out here he was doin 90 mph, his oil was 230-236 water: 200, and the outside temp was 99-103.
he was driving from Las Vegas through the mojavi desert.
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Only chicks drive Jettas. And most of the time they're pretty hot chicks. I drive 50 miles each way to work, so I've done the research ;)
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Originally posted by Raubvogel
Only chicks drive Jettas. And most of the time they're pretty hot chicks. I drive 50 miles each way to work, so I've done the research ;)
Wait a minute, I was told only chicks drive 3-series...then it was Miata's, then it was...:cool:
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Chicks have many choices in automobiles nowadays. Jettas, 3-series, miatas, V6 mustangs (and up until a few years ago, the V6 camaro), and the list goes on. Plenty of rides for the missus' of the country!
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Originally posted by SOB
Chicks have many choices in automobiles nowadays. Jettas, 3-series, miatas, V6 mustangs (and up until a few years ago, the V6 camaro), and the list goes on. Plenty of rides for the missus' of the country!
There's a "6" theme going here...hmmm, 6..6..inches? >< ;)
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Six POINT Six inches.
Circumfrence.
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Originally posted by beet1e
GS,
I've had two cars with that same engine. The 2.8i V6. Although it's a V6, there's only one cylinder head, and the cylinders are arranged in a 15° V.
My temperature readouts were in Celsius, but the coolant temperature would always be a constant 90°C (about 195°F). In normal driving, the oil would be 96°C. But in high speed driving (140mph/225km/h on the German autobahn) the oil temp would rise to 112°C! That's almost the 236°F that your brother is getting in normal driving, and seems rather high to me. Even driving flat out with 5500rpm, I never quite ran the oil as hot as your brother is doing.
Somebody asks a car question and someone else comes up with high speed test data on an identical machine, within two hours. What a forum. :aok
PS
112C=234F
96C=205F
I think Gunny's brother is OK.
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Originally posted by Ripsnort
There's a "6" theme going here...hmmm, 6..6..inches? >< ;)
I wish! Damn 3-series. :(
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Originally posted by FaliFan
Euro cars are normally designed for temperate climates, not deserts. It may simply be that the cooling system is underdimensioned for your climate.
Read GS's post again. Of his brother, he said On his way out here he was doin 90 mph, his oil was 230-236 water: 200, and the outside temp was 99-103.
Such temperatures are not unusual in parts of Europe, eg. Spain and southern France. I have driven my VWs in both those countries at the hottest time of the year, and the coolant temperature never rose above 90°C = 194°F. VW thermostats are set to 90°, and in my experience the running temperature never varies, not even by as much as the thickness of the needle.
GS - there is a known fault with certain VW cooling fans. I had to have mine replaced under warranty. If there's still a problem, I'll supply further details.
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Originally posted by SOB
I wish! Damn 3-series. :(
Its a "straight" 6, not a "Vee-6".....(http://www.bimmerfest.com/forums/images/smilies/icon9.gif)
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You said he changed the thermostat? Did he get a 180degree thermostat or something higher? That would do it.
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Originally posted by RightF00T
You said he changed the thermostat? Did he get a 180degree thermostat or something higher? That would do it.
He got a 200 degree thermostat. It's all they had. Would a lower thermostat do the trick?
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200 is 93°C - not too much above the VW standard 90°.
A radiator flush out??? What does he put in the radiator - VW approved coolant, or boring old tap (faucet) water? If the latter, and if he lives in a hard water area, the radiator will become knackered after a few years. I don't suppose he uses antifreeze - lol - and ordinary water has a lower boiling point than custom made coolant. It probably doesn't do as good a job in dissipating the heat either.
I had this problem on a car years ago - part of the radiator blocked by hard water deposits. Here's how to check for this: Immediately after driving a few miles, open the bon... er, hood, and feel the radiator, taking care not to burn your hand. Check across its full width. If any part of the radiator feels cold, it's blocked. Best solution - new radiator. Not worth buggering about with flushing/chemical treatments if it's that bad.
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Although it may not be much...you would think changing to a different thermostat would have some ramifications. One example being higher rpms...
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Some engines are sensitive to the running temperature and if factory thermostat opens at 200F then you (or your bro) should stick with it.
IIRC VW VR6's cyl-head is quite a piece of art and usually engineers know what they are doing (like running engine at +200F).
Oilcooler could be good idea thought I'm quite sure VW did test their car in hot climates too.