Recent Topics
9/1-10/5 Pep Boys Sales Ad
by tenderloin
09/01/14 02:21 AM
To Buy the Jug, or use another weight?
by Timo325
09/01/14 02:00 AM
8/31-9/7 Pep Boys Sales Ad
by tenderloin
09/01/14 01:57 AM
weedeater one we261
by turbodieselfreak
09/01/14 01:42 AM
Engine rebuild durability?
by PandaBear
09/01/14 01:31 AM
FRN is back
by larry007
09/01/14 12:41 AM
Who makes TrueGard brand?
by Datsyuk
09/01/14 12:38 AM
Pennzoil Platinum 15w50 Pallet 125 boxes/ 6qt
by Datsyuk
09/01/14 12:26 AM
8000 H&K G36 Assault Rifles
by Merkava_4
08/31/14 11:42 PM
OC Tomorrow
by redhat
08/31/14 11:13 PM
Pennzoil Platinum $1.99 a quart. Menards.
by bprat318
08/31/14 11:00 PM
Shoulder popping/crunching
by lawman1909
08/31/14 10:49 PM
Newest Members
DennisWaller, DMackey, Mambo_Dave, 2165, JohnSawyer
51160 Registered Users
Who's Online
24 registered (Apollo14, babbittd, 01_celica_gt, 3800Series, Black_Thunder, 901Memphis, 2 invisible), 669 Guests and 219 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51160 Members
64 Forums
218606 Topics
3447033 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Topic Options
#2162964 - 02/06/11 02:22 PM Maximum safe engine temperature?
Minou Offline


Registered: 01/27/05
Posts: 462
Loc: Montreal, Ca/Hudson, FL
Saw my engine temperature (on my ScangaugeII) jump from a normal 82C to as high as 101C last night while driving from Plattsburgh NY to Montreal in a snow storm. Speed was in the 60-80 Km range and RPM around 1500 the whole way.

The engine temp gauge needle still sat 1/8" below the half way point as usual. The radiator and front of the car was getting blocked by snow. I stopped once at the border to remove what I could and engine temp quickly went down to 80C afterward but gradually went back up to 96-98C and to 100-101C. Conditions were too nasty and unsafe to stop again so I turned up the heat in the cabin and cracked my window. I was at 95-96C when we got home. Here's is a shot on my engine compartment:




No light appeared on the dashboard and coolant and oil levels checked out OK this morning.

How high would be unsafe?


Edited by Minou (02/06/11 02:25 PM)
_________________________
2014 Mazda 6 GS
Motomaster Formula 1 Synthetic 5W-20
Mazda PE01-14-302 filter

Top
#2162971 - 02/06/11 02:28 PM Re: Maximum safe engine temperature? [Re: Minou]
bigbird_1 Offline


Registered: 12/15/08
Posts: 254
Loc: Winnipeg
Unsafe would be where your check engine light came on. My Chev has an actual digital temp gauge. I have seen it as high as 104C without the fan coming on to assist. When it gets that high in bumper-to-bumper summer traffic, I just turn on the AC. The temp then quickly drops to 90C. If I'm already using AC in heavy traffic, it won't go to more than 92C.

Top
#2162976 - 02/06/11 02:43 PM Re: Maximum safe engine temperature? [Re: Minou]
440Magnum Offline


Registered: 02/01/09
Posts: 6216
Loc: Texas
It all depends on the engine design, but 101C is just a tad over boiling. No big deal at all. Many engines are designed to run right at 100C. The usual "danger zone" for NASCAR engines (yes, its not a very direct comparison...) is around 230-240F (110-115C)
_________________________
'66 Dodge Polara & '69 Dodge Coronet R/T both 440/727
'08 Ram 1500 4.7/545RFE
'12 Challenger SRT8 392/6-speed
'99 Cherokee 4.0, '11 Grand Cherokee 3.6

Top
#2163001 - 02/06/11 03:13 PM Re: Maximum safe engine temperature? [Re: Minou]
chubbs1 Offline


Registered: 06/09/10
Posts: 4574
Loc: Merritt Island FL, USA
Not much you frozen suckers can do, all I can say is instead of driving north in a blizzard is to drive south to FL. It is about 76F where I'm at today.

You know I'm only playin' 101C is fine, keep an eye on it and be safe out there.
_________________________
'12 Charger SXT
QSUD 5w30 OEM filter

'12 Charger SXT
Edge FST EP 5w30 OEM (Mine;)

'11 Hyundai Sonata GLS
QSUD 5w20 OEM Filter


Top
#2163270 - 02/06/11 07:49 PM Re: Maximum safe engine temperature? [Re: Minou]
hooligan24 Offline


Registered: 09/05/07
Posts: 903
Loc: wa state
pressurized cooling systems raise the boiling point of the coolant/water mix. With a little google searching, you can find a chart that shows what the boiling point would be at for certain pressures

If I remember right, a proper mix and a 14-15psi pressure cap, will raise the boiling point to 245-250 degrees F.


Edited by hooligan24 (02/06/11 07:55 PM)
_________________________
05 Dodge Neon SRT-4 - Mobil 1 SN 0w40
03 Nissan Xterra S/C'ed - Maxlife Blend 10w30
03 Yamaha YZF-R6 - Rotella T6 5w40

Top
#2163343 - 02/06/11 09:05 PM Re: Maximum safe engine temperature? [Re: Minou]
ltslimjim Offline


Registered: 08/06/10
Posts: 5143
Loc: PL&F
I'd just change my oil if anything. At the very least, running hot will hurt the oil's life.
_________________________
1992 Civic VX 275k+
HG replaced, waiting to sample

Top
#2163355 - 02/06/11 09:20 PM Re: Maximum safe engine temperature? [Re: Minou]
eljefino Offline


Registered: 06/15/03
Posts: 23777
Loc: ME
You're fine. But when it all melts out make sure your electric rad fan turns. If it got jammed with snow it could have burnt the motor out.

Top
#2163427 - 02/06/11 10:27 PM Re: Maximum safe engine temperature? [Re: Minou]
CBR.worm Offline


Registered: 05/10/05
Posts: 1402
Loc: Jupiter, Fl
My electric fans don't come on until over 105c. I would check that the fans fuse didn't blow from being blocked, should be fine.
_________________________
'06 Infiniti G35 Sedan 6MT - 145k

Top
#2163429 - 02/06/11 10:30 PM Re: Maximum safe engine temperature? [Re: Minou]
Chris142 Offline


Registered: 06/05/03
Posts: 11254
Loc: apple valley, ca
100c or 212F is normal. No worries there. My Jeep often runs 230F on a hot day in Death Valley,Ca. 240F if I'm stuck in traffic with the AC on.

I consider 240F my max comfort temp. Anything over that and I get it into the wind.

Many GM cars don't turn the low speed fan on untill 225 and the high speed fan at 235.


Edited by Chris142 (02/06/11 10:34 PM)
_________________________
02 Jeep Wrangler super-s 10/30
87 F250 Diesel Delo 15w40
04 Tahoe STHM 10w30
Z400 napa 15w50
KLR250 Maxima 10w40
Polaris Trailblazer delo 5w40

Top
#2163553 - 02/07/11 01:45 AM Re: Maximum safe engine temperature? [Re: Minou]
ltslimjim Offline


Registered: 08/06/10
Posts: 5143
Loc: PL&F
Okay, all of those temps are well below overheating still.
_________________________
1992 Civic VX 275k+
HG replaced, waiting to sample

Top
#2163555 - 02/07/11 01:46 AM Re: Maximum safe engine temperature? [Re: Minou]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
That seems normal, considering he conditions.
212 is nothing.
Sure, 195 is more normal, but I would not think twice about an occasional bit more.

Top
#2163753 - 02/07/11 08:48 AM Re: Maximum safe engine temperature? [Re: Minou]
NateDN10 Offline


Registered: 01/10/10
Posts: 1384
Loc: Rochester, NY
Like others have said, 101C is absolutely nothing to worry about. Still completely normal. Cooling fans often don't come on until 105 to 110C.
_________________________
2005 Chevrolet Cobalt - 85,000 mi.
2012 Mazda5 - 63,000 mi.

Top
#2165234 - 02/08/11 02:47 PM Re: Maximum safe engine temperature? [Re: chubbs1]
Minou Offline


Registered: 01/27/05
Posts: 462
Loc: Montreal, Ca/Hudson, FL
Originally Posted By: chubbs1
Not much you frozen suckers can do, all I can say is instead of driving north in a blizzard is to drive south to FL. It is about 76F where I'm at today.

You know I'm only playin' 101C is fine, keep an eye on it and be safe out there.


LOL, I was driving back from the Plattsburgh Airport to Montreal because our flight to FLORIDA had been canceled! We
were rebooked the next day and I am writing this from FL today but it`s not that warm overhere...

Anyhow, the Fe drove great on Sunday back to Plattsburh on dry pavement and engine temp was back to 82C.
_________________________
2014 Mazda 6 GS
Motomaster Formula 1 Synthetic 5W-20
Mazda PE01-14-302 filter

Top
#2165260 - 02/08/11 03:07 PM Re: Maximum safe engine temperature? [Re: Minou]
rslifkin Offline


Registered: 06/27/10
Posts: 2192
Loc: Stamford, CT / Rochester, NY
Normal running temp for a lot of vehicles (such as my Jeep) is 210* F, so just under 100* C. Unless it hits 230* F or hotter, or is running sustained over 220 - 225* F, it's not an issue for most engines.
_________________________
1998 Jeep Grand Cherokee 5.9 Limited with Heads/Cam/Headers/Exhaust/Tune/Shift Kit (171k miles, bought with 100k)
Rotella T6 @ 6k OCI

Top
#2165284 - 02/08/11 03:27 PM Re: Maximum safe engine temperature? [Re: Minou]
Doug Hillary Offline


Registered: 05/30/03
Posts: 4828
Loc: Airlie Beach Australia
Hi,
Minou - All engines will vary somewhat with most of today's Euro engines runing around 93C as "normal". My Boxster typically sees around 100C without fans on and around 105C (it purposely runs hotter than normal) - most run at around 92-96C.

As an example the Porsche 928 (V8) has a very complex cooling system. The S4 version (digital dash - fans/flaps controlled via computer) has an initial warning at 118C and another demanding shut down at 120C

(BMW M3s were even allowed oil temps of around 130C during the 1990s!)

Heavy high speed diesel engines typically run at around 96C before their air operated fans activate (chip driven) and have a automatic powerdown/shutdown at around 105-110C. My trucks averaged around 88-90C

Operating around 90-95C has many benefits considering it is not so long ago that 76C was accepted as "normal" - and engine sludging was quite common

In your case no damage would have been done but sufficient airflow is a critical part of cooling system efficiency. I have seen radiators frozen solid and the Driver wondering why the coolant is boiling!
_________________________
Regards
Doug

Top