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5/26/12 7:23pm - Original Message: 'Question on Temps'
Almond81Vette
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Stanley, NC - USA

Vette(s):
1981, dark blue w/carmel interior. 350 stock, auto tranny, Q-jet carb, ECM box

Joined: 8/9/2010
Posts: 91
   Just wondering what others may be seeing on temps? I have a 1981 stock with a 350/195hp GM crate motor installed. All ECM and other parts operating as was original.
   Today during a 80 miles run in upper 80 degrees I was having a water temp just below the 200 on the gauge and was around 220 on the oil temp. I was not running AC but was running about 65mph on interstate.
   When I stopped for a few minutes at home while opening the garage when I went to refire the engine did start but was harder, had to spin out and pump gas a couple of time.
   I know there is some heat build up in the engine compartment when hood is closed that could cause some of the harder starting since might be heating up the carb some but is my heat readings in normal range?
   Thanks in advance for any answers.


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5/26/12 10:13pm - Reply: 'Re: Question on Temps'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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190 deg running down the road would sound normal to me. The temp creeping up while stopped is also normal, since you don't have the same volume of air flowing thru the radiator. As long as the temps come down while moving, and they do not climb above 230 or so, I'd say yours is about normal. If it gets too hot, it will puke coolant. If it's not puking, then the temps are ok at that time. Another thing is, you can't really always believe what the gauge is reading...they aren't really all that accurate. If you have, or have access to an infrared temp gun, check the actual temp against the gauge, and see how close it really is.
 Make sure the radiator is clean, as in no bugs and stuff on it or the A/C condenser.

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5/27/12 12:27am - Reply: 'Re: Question on Temps'
tb2k82ce Lifetime Member
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Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
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My 82 run about 190 - 200 water and 210 - 220 Oil. I do have an infrared red heat gun and my gages to match close.  So Iím sure on my car they are at least in the ball park. 

By the way we are looking at old cars and 40 years ago I did gage repair when we actually took them apart like you would watch changing pivots and shunts etc.   I guess all Iím saying is gages can change their reading over time so Adam is correct when he says they can be off overtime.  Some will not some will.  Never did that job long enough to get a feel for the why some did and some seemed not to. 

If you ever pull off the gage cluster you will notice shunts across the gage terminals and they will be different colors from your buddy with the same car.  Those are the calibration shunts.   My guess is the gage manufacturing specification was so wide that they had to be calibrated before installation to meet the accuracy requirement for the car.   Does not make a lot of difference unless you replace the gauge with another one.  


|UPDATED|5/26/2012 10:27:21 PM (AZT)|/UPDATED|


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5/27/12 12:28am - Reply: 'Re: Question on Temps'
tb2k82ce Lifetime Member
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Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
Posts: 2007
My oil and water temps also seem to reach the same temp range the longer I'm on the road.  Always around 190 for water 200 for oil.


|UPDATED|5/26/2012 10:28:51 PM (AZT)|/UPDATED|


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5/27/12 6:51am - Reply: 'Re: Question on Temps'
manget1 Lifetime Member
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Indianapolis, IN - USA

Vette(s):
Silver 1974 Convertible - L82 4 speed Low miles (was only 8,900 when I bought it in March 2006) - Now 42K miles. Original owner bought it as an investment for son's college expenses. 2008 Jetstream Blue Convertible - DAILY DRIVER!!

Joined: 9/3/2006
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My 74 runs just slightly above 200 on the highway.  I have noticed once or twice that if I stop at a rest area that when I restart the car, the temp has spiked.  It worried me the first time or two, but as soon as the engine is going and the fan running, that it cools right back down.
 
Last week going to Charleston, I was worried because right after a rest area, there was a detour and backup, but it went down to the 205-210 mark and stayed there even in bumper to bumper


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5/27/12 9:39am - Reply: 'Re: Question on Temps'
Almond81Vette
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Stanley, NC - USA

Vette(s):
1981, dark blue w/carmel interior. 350 stock, auto tranny, Q-jet carb, ECM box

Joined: 8/9/2010
Posts: 91
I think my temps are around normal after too talking with a couple of other '81 owners on road driving conditions.........it's when I am stopped, engine shut off that temps climbs in engine compartment more and makes restarting a little harder.
 
Engine does refire but not without some extra spinning and pumping the gas some and then have to baby it just a little to get her running smooth again.
 
My engine compartment is packed and still as she came off the assembly line so very little open space to allow for heat to escape easily so thinking heat is rising under the hood when stopped may be causing some boiling of fuel to cause the harder restart.
 
Q-jet was remanufactured by All-American Carbs a few months ago so it is in good shape and new manual fuel pump put on when we did the engine swap. Also new radiatior installed with swap.
 
Maybe just pop the hood when stopped for a few minutes will help out, at least allow for the heat to escape and not build up as high around the fuel parts?


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6/1/12 6:43pm - Reply: 'Re: Question on Temps'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 763
Is engine crankaing at the normal speed when hard starting? If not it may be heat soak of the starter solenoid causing the hard start.....happens frequently with headers. It will start normally when engine has cooled.

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6/1/12 8:06pm - Reply: 'Re: Question on Temps'
Almond81Vette
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Stanley, NC - USA

Vette(s):
1981, dark blue w/carmel interior. 350 stock, auto tranny, Q-jet carb, ECM box

Joined: 8/9/2010
Posts: 91
danascar said: Is engine crankaing at the normal speed when hard starting? If not it may be heat soak of the starter solenoid causing the hard start.....happens frequently with headers. It will start normally when engine has cooled.


Yes Dan, engine spins over fine, believe just some extra radiant heat buildup in engine compartment once stopped and fan is not turning. With all still factory installed parts, air pump, ECM, AC etc it is a full engine bay with little air space to let escape so on those hotter days and harder runs reckon just need to pop the hood for a few to let the heat escape and not built up inside.

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6/1/12 8:14pm - Reply: 'Re: Question on Temps'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 763

Try running a 165 degree t-stat....should lower water temp and help with excess heat.



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6/2/12 8:34am - Reply: 'Re: Question on Temps'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
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Have you tried a carb heat shield?

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6/2/12 12:37pm - Reply: 'Re: Question on Temps'
Almond81Vette
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Stanley, NC - USA

Vette(s):
1981, dark blue w/carmel interior. 350 stock, auto tranny, Q-jet carb, ECM box

Joined: 8/9/2010
Posts: 91
lukesvette said: Have you tried a carb heat shield?


No have not, will look at that option, thanks.

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6/18/12 4:21pm - Reply: 'Re: Question on Temps'
knotacare
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Newark, DE - USA

Vette(s):
1968 Conv, 454HO,500HP-600TQ, TKO-600,3:70 HD rear,hotrod air, custom paint & suspension,1973 Ruby Red,T-top, 383 Stroker, TK)-500,frame off restro, 1977 Yellow (1 of 51 ) L-48 4 spd, 99% original.

Joined: 7/26/2004
Posts: 453


On my 68 BB I install 2 spal fans (7") on the frame to pull heat out of the engine compartment. So before I start the car when it's hot outside I run the fans for 30 seconds or so & it starts right up.

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|UPDATED|6/18/2012 2:21:57 PM (AZT)|/UPDATED|


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6/13/12 3:17pm - Reply: 'Re: Question on Temps'
Gunslinger
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398
You may be experiencing fuel percolation in the carb due to the underhood heat.  A spacer may help but hood clearance is already tight on a C3.  Re-routing the fuel line might help as well or wrapping it with heat resistant material.  

Your running temps seem about normal like everyone else seems to agree.  The '78 L82 I used to own ran between 195-210 degrees with the occasional spike in extremely hot and humid weather or standing in heavy traffic.

My '69 427/435 seems to be an anomaly for big blocks...it runs in the 180 degree area in all but hot and humid weather while sitting in traffic...I still have flashbacks of driving it in a parade in 100 degree heat...the temp needle sweeping further and further right and the smell of the clutch.  No more parades for that car!

As far as installing a lower temp thermostat...it won't make a difference.  That just determines at what temperature the 'stat opens...not a limit on what temp the engine will reach.  If a car is overheating with a 195 degree thermostat, installing a 180 degree 'stat will only allow it to take a little longer before it overheats.  It establishes a temperature floor, not a ceiling.


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6/13/12 3:56pm - Reply: 'Re: Question on Temps'
tonytheroofer
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Rochester, NY - USA

Vette(s):
1980 L- 82 fully restored and upgraded.

Joined: 6/12/2012
Posts: 95
I run a solid 180 . all the time .. This is because I run a 4 core rad with a 180 t-stat . 

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6/17/12 6:57pm - Reply: 'Re: Question on Temps'
procketus
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Hickory, NC - USA

Vette(s):
1980

Joined: 9/3/2011
Posts: 5
Hey Tom, just saw your post here and decided to go for a "ride" down I-40. Changed the timing this morning according to Lars' papers and just had to try it out. Anyway, my temps ran about 170 running the hwy. Speeds were around 70-75. Once I got back home and shut her down it went up to around 190. Fired it up to put it away for the night and it dropped right down. Even around town  it rarely gets above 180.
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6/18/12 3:05pm - Reply: 'Re: Question on Temps'
KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484
I went with an aluminum radiator a couple of years ago and never see the temp. go any higher than 180. I always put the hood up when I first park it so as to protect the paint on the hood from engine heat. I agree that it must help with restarts, too. Kevin

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6/18/12 7:01pm - Reply: 'Re: Question on Temps'
Almond81Vette
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Stanley, NC - USA

Vette(s):
1981, dark blue w/carmel interior. 350 stock, auto tranny, Q-jet carb, ECM box

Joined: 8/9/2010
Posts: 91
procketus said: Hey Tom, just saw your post here and decided to go for a "ride" down I-40. Changed the timing this morning according to Lars' papers and just had to try it out. Anyway, my temps ran about 170 running the hwy. Speeds were around 70-75. Once I got back home and shut her down it went up to around 190. Fired it up to put it away for the night and it dropped right down. Even around town  it rarely gets above 180.


Steve the issue is not water or engine oil temps too high but the buildup of heat under the hood once stopped. Since my '81 still has all parts as came off the assembly I have an engine compartment full and very little open space for heat to get out so the radiant heat buildup is what is kicking me......so for now after getting hot and stopping, when can pop the hood and let the heat escape.....until a better idea comes along.

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6/18/12 9:49pm - Reply: 'Re: Question on Temps'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
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I know guys that used to drive around all day with the hoods unlatched on Shark cars....and that was back when they were still kinda NEW! All due to the heat.
I always pop the hood release on mine if I am parked for more than a few minutes, and it stays unlatched all the time while in the garage.
You think yours get hot under there? Try working on a big block!!! LOL


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6/25/12 1:53pm - Reply: 'Re: Question on Temps'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
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Make sure that all of the foam seals around and above the radiator are intact and in place and if it still has a fan clutch, ensure that it is functional.

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6/27/12 4:45pm - Reply: 'Re: Question on Temps'
dskopp
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
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Adams' Apple said: I know guys that used to drive around all day with the hoods unlatched on Shark cars....and that was back when they were still kinda NEW! All due to the heat.
I always pop the hood release on mine if I am parked for more than a few minutes, and it stays unlatched all the time while in the garage.
You think yours get hot under there? Try working on a big block!!! LOL



Oh, now I get it!!  Its an in-bread cat!!!

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