C4 and C5 Coolant Temperatures...
- Thread starter Ken
- Start date
dugr
Active member
Hey Ken,
Thanks for the informative post.
Doug
Thanks for the informative post.
Doug
Thank you for the great information!
I usually run at around 185-190 with my K&N in there. I did notice that after stopping in traffic, the temp. would drop much faster since I installed the K&N. And I never run the car unless coolant temp. is a minimum 150 or 170 in cold weather situations.
What is the ideal oil temp?
I usually run at around 185-190 with my K&N in there. I did notice that after stopping in traffic, the temp. would drop much faster since I installed the K&N. And I never run the car unless coolant temp. is a minimum 150 or 170 in cold weather situations.
What is the ideal oil temp?
- Thread starter
- #4
Ken
Gone but not forgotten
V
vetsvette
Guest
With all due respect to Jerry Watts I don't see why the 160 would cause uneven temps if the 180 won't. Is this temp "ideal" for the C4 or the C5. It seems that the ideal temp for an aluminum block would probably be different from an iron block. The only problem I heard Gordon Killebrew mention with a cooler thermostat was that the oil doesn't get to a high enough temp on short drives to evaporate the water and other impurities. But with Mobil 1 and changing oil and filter every 3K that doesn't seem to be too much of a problem. I've been running a 160 degree thermostat with HPP programming to turn the fans on at temps comenserate with the t-stat for the last 25000 miles and have seen no problems that would point to excessive wear on the engine. Just my .02.
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c4ever
Guest
Jerry needs to live in S. Florida.
Carlo:cool
Carlo:cool
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Burnnrubber
Guest
The Tempature is Rising
Internal combustion engines will actually produce more power @ higher net water/combustion chamber temperatures. It promotes better internal combustion. What you want to lower is intake air temperatures to promote volumetric efficiency. The benefit of the 160 degree T Stat is that it tricks the processor into believing the engine is in the warm-up mode. The processor then lengthens the fuel injector on time & duration. This helps top end speeds some, at the cost of overall reduced fuel economy & engine longevity. When the engine is running around in closed loop which can happen with a 160 T Stat the raw unburned fuel will find its way past the piston rings & remove the thin film of oil which coats & protects the cylinder walls. This also leads to sludge build up.
Most racing teams F1, Indy, Etc. run their engines at a pre determined optimum temperature 210-230 degrees would be close. They keep the temperatures on the ragged edge to take advantage of all the horsepower/torque. There will not be a problem unless the coolant boils.
Internal combustion engines will actually produce more power @ higher net water/combustion chamber temperatures. It promotes better internal combustion. What you want to lower is intake air temperatures to promote volumetric efficiency. The benefit of the 160 degree T Stat is that it tricks the processor into believing the engine is in the warm-up mode. The processor then lengthens the fuel injector on time & duration. This helps top end speeds some, at the cost of overall reduced fuel economy & engine longevity. When the engine is running around in closed loop which can happen with a 160 T Stat the raw unburned fuel will find its way past the piston rings & remove the thin film of oil which coats & protects the cylinder walls. This also leads to sludge build up.
Most racing teams F1, Indy, Etc. run their engines at a pre determined optimum temperature 210-230 degrees would be close. They keep the temperatures on the ragged edge to take advantage of all the horsepower/torque. There will not be a problem unless the coolant boils.
Redbob
Well-known member
Re: The Tempature is Rising
The problems here are (1) higher water temp = higher intake air temps, since the intake plenum etc. gets heated by the engine;
(2) higher water temp = higher oil temps, and oil life is cut in half for every 20 degree F increase over 160F;
(3) Jerry Watts doesn't think 230F is a problem because he's not living in Texas or paying the repair bills for my engine!
If 190F thermostats were such a great idea, the automakers would have gone to them long before emissions requirements forced them to. High temp thermostats, and the resulting hotter combustion chamber walls, mean lower unburned hydrocarbons: that's the beginning and the end of the reason for high-temp 'stats.
Burnnrubber said:
The problems here are (1) higher water temp = higher intake air temps, since the intake plenum etc. gets heated by the engine;
(2) higher water temp = higher oil temps, and oil life is cut in half for every 20 degree F increase over 160F;
(3) Jerry Watts doesn't think 230F is a problem because he's not living in Texas or paying the repair bills for my engine!
If 190F thermostats were such a great idea, the automakers would have gone to them long before emissions requirements forced them to. High temp thermostats, and the resulting hotter combustion chamber walls, mean lower unburned hydrocarbons: that's the beginning and the end of the reason for high-temp 'stats.
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Burnnrubber
Guest
Yes & No
1) Your exactly right, I suppose you could do the old drag race Mod. & block the water ports off in the intake while you are putting in the low temp T-stat.
2) Change your oil as required, as your going to really need to with the lower temp T stat. (Fuel/oil contamination)
3) Your right again..
4) The reason they produce less Hydrocarbons is because there is more complete combustion & hence more power avaliable. Way back when in ought 2 when they ran those 160-180 Deg, T-stats the automakers could not control the Air-Fuel ratios nearly as close as they can with micro processors (Read Fuel Injection).
1) Your exactly right, I suppose you could do the old drag race Mod. & block the water ports off in the intake while you are putting in the low temp T-stat.
2) Change your oil as required, as your going to really need to with the lower temp T stat. (Fuel/oil contamination)
3) Your right again..
4) The reason they produce less Hydrocarbons is because there is more complete combustion & hence more power avaliable. Way back when in ought 2 when they ran those 160-180 Deg, T-stats the automakers could not control the Air-Fuel ratios nearly as close as they can with micro processors (Read Fuel Injection).
F
Fastvette86
Guest
I put a 160 thermostat in my Vette 2 years ago at 98,000 miles. It always runs 105 degrees over the outside air temp, so around here in the winter my engine runs 155 to 158 running down the highway. I got a oil cooler, which is cooled (heated) by the engine coolent so my oil temp runs right with the engine temp in the winter. No problems so far and I've got 120,000 miles on the car now. It still makes me nervous. Probably should drop in a 180 degree stat each winter.
I've seen no change in mileage, still 26 on the freeway and 14 around town. Got it up to 16 when I drove like my 75 year old mother for 2 days after I got my last ticket. :t
The biggest benefit I've seen is now my throttle body doesn't get sticky like it did with a 190 stat.
Dennis
I've seen no change in mileage, still 26 on the freeway and 14 around town. Got it up to 16 when I drove like my 75 year old mother for 2 days after I got my last ticket. :t
The biggest benefit I've seen is now my throttle body doesn't get sticky like it did with a 190 stat.
Dennis
Redbob
Well-known member
There is one more small point: with higher combustion chamber temperatures, your engine is just a little more inclined to detonate, so it's a little more sensitive to fuel octane level.
With the knock sensor looking out for you and dialing back the spark as required, you'll never notice the loss of horsepower - until someone running the 160 'stat pulls up next to you!
With the knock sensor looking out for you and dialing back the spark as required, you'll never notice the loss of horsepower - until someone running the 160 'stat pulls up next to you!
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Burnnrubber
Guest
Read the Pump
If you would have selected the correct nozzle at the gas station (92 octane) you wouldn't need to worry about that guy with the 160 Deg T-stat. He would be so far behind you it wouldn't matter.
If you would have selected the correct nozzle at the gas station (92 octane) you wouldn't need to worry about that guy with the 160 Deg T-stat. He would be so far behind you it wouldn't matter.
Redbob
Well-known member
Well, I'd have been talking about an apples-to-apples comparison.
More specifically, L-98's will run more spark with more octane on up to about 110 Research octane, equivalent to maybe 98 - 100 "pump" (R+M/2) octane rating. And with an L-98 at least, more spark = more power. About 260 - 265 HP being possible with no other modifications.
What this means is that the cooler engine, less inclined to knock, will make more power.
More specifically, L-98's will run more spark with more octane on up to about 110 Research octane, equivalent to maybe 98 - 100 "pump" (R+M/2) octane rating. And with an L-98 at least, more spark = more power. About 260 - 265 HP being possible with no other modifications.
What this means is that the cooler engine, less inclined to knock, will make more power.
V
vetsvette
Guest
the way I understand it is since the LT1/4 use reverse cooling, The cooler water going to the heads first results in a denser fuel/air charge. Supposedly this was the reason for the reverse flow modification anyway. Seems to me cooler heads=denser f/a charge=more power. Otherwise why use a cold air induction system.
I have trouble with absolute statements like "180 degree thermostat is ideal for C4 & C5". We are talking about the 180 being Ideal for a L83, L98, LT1, Lt4, LT5, LS1, and LS6. Does this mean that one size REALLY does fit all? :confused
I have trouble with absolute statements like "180 degree thermostat is ideal for C4 & C5". We are talking about the 180 being Ideal for a L83, L98, LT1, Lt4, LT5, LS1, and LS6. Does this mean that one size REALLY does fit all? :confused
C
c4crazy
Guest
cooling knowledge for c4s
Ken said:
- Thread starter
- #16
Ken
Gone but not forgotten
What the hell???? :confused
_ken :crazy
_ken :crazy
Redbob
Well-known member
The real problem with the factory cut-in temperatures for the cooling fans is not so much the water temperature, but the A/C head pressure. At least here in the South, A/C head pressures quickly reach the point where the torque required to turn the compressor exceeds the torque developed by the A/C clutch, if the ambient temps are over about 95 - 98 F -- which happens often!
Helloooo, GM, is anyone paying attention to conditions OUTside of Detroit?
Sure, the 'puller' fan comes on when the A/C's on, but when the ambient is over 95F both fans need to be on, regardless of water temp. Having replaced three A/C clutches before I figured this out (OK, I'm a slow learner...), I think I know whereof I speak.
One solution, and I know it's not for everyone, is to use your existing relays and wire them to a toggle switch. Whenever the ambient temperature is up, and/or whenever the A/C is on, you flip the switch.
A fringe benefit of this is improved A/C performance in slow traffic.
Regards,
- R
Helloooo, GM, is anyone paying attention to conditions OUTside of Detroit?
Sure, the 'puller' fan comes on when the A/C's on, but when the ambient is over 95F both fans need to be on, regardless of water temp. Having replaced three A/C clutches before I figured this out (OK, I'm a slow learner...), I think I know whereof I speak.
One solution, and I know it's not for everyone, is to use your existing relays and wire them to a toggle switch. Whenever the ambient temperature is up, and/or whenever the A/C is on, you flip the switch.
A fringe benefit of this is improved A/C performance in slow traffic.
Regards,
- R
IraPlayer
Active member
Electric Water Pump
Has anyone looked into electric water pumps?
I'm not sure where I read it, (I was surfing at a rapid rate, saw the comment, but didn't register it as important until I couldn't find it again...
) but it claimed the following for an LT1:
1. Standard water pump flow is maximum 22 GPM at 6000 RPM.
2. Electric (don't know model/manufactured) provides 25 GPM at all times.
3. Reduced load on engine (MO POWER to the wheels)
4. Can leave pump on when the engine is shut down.
5. The standard electrical system can handle the load.
Does anyone have information on these?
What? Where? How? How much?
Next time I'll slow down a bit and get it myself.
Rick
Has anyone looked into electric water pumps?
I'm not sure where I read it, (I was surfing at a rapid rate, saw the comment, but didn't register it as important until I couldn't find it again...
) but it claimed the following for an LT1:1. Standard water pump flow is maximum 22 GPM at 6000 RPM.
2. Electric (don't know model/manufactured) provides 25 GPM at all times.
3. Reduced load on engine (MO POWER to the wheels)
4. Can leave pump on when the engine is shut down.
5. The standard electrical system can handle the load.
Does anyone have information on these?
What? Where? How? How much?
Next time I'll slow down a bit and get it myself.
Rick
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Bill C
Guest
WHEEEEEU,,, now I'm really confused :crazy :eyerole
V
vetsvette
Guest
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