Can an engine run tooo cool?

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    Author Topic: Can an engine run tooo cool?  (Read 4314 times)

    Offline GoodysGotaCuda

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    Re: Can an engine run tooo cool?
    « Reply #15 on: June 03, 2008 - 07:30:42 AM »
    Quote from: Aussie Challenger on June 03, 2008 - 07:14:26 AM
      If you take out the thermostat and your cooling system is in good condition, the motor will probably run around 110 - 120 deg F, on the other hand if you leave the thermostat out and it runs around 180/190 normal driving then you probably have a problem.  Hope this may help...   :bigsmile:   :cheers:

    Depends...with the thermostat out there is no restriction in the cooling system. Being that, the coolant is moving through both the block and the radiator very rapid. The coolant starts to move too fast through the radiator and doesn't have enough soak time for the heat to be removed from it. Regardless you shouldn't run without a thermostat, the factory designed the coolant jackets, the water pump and the radiator for that restriction to be there in the system. Yes he has a aftermarket radiator, but even still it can travel too fast. I've heard that theory is 'not true'...I did experience overheating until i put a thermosat in with my 360 71 Dodge Dart...

    In my opinion if you have a 180 and are pulling 200* temps, you have an issue. Unrelated to if the t-stat is there or not.

    My 2cents!
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    Offline Moparal

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    Re: Can an engine run tooo cool?
    « Reply #16 on: June 03, 2008 - 08:08:52 AM »
    I was taught back in the years that the engine was more fuel efficient when ran hotter. They make more power. Most new car engines I believe run 210 and a bit more, helps for molecule break down. You want the intake air cool and the engine hot to make a fuel efficient combustion. I do no mileage does increase if the engine runs hotter. The gas turns to vapor and mixes with the air charge quicker.  Even on my race car we had to get the engine up to 165 when doing the burn out, when staged it was 180 and at the finish it was around 200 degrees. Then go to the cool down pits. There will be less carbon build up in the cylinder heads and on the valve stems when an engine is ran hotter then cold. 

    I run a 195 thermostat and it runs around 198/205 I checked the temp by removing the rad cap and putting my thermometer in the rad after a long run. Water boils at 212 degrees f, but antifreeze raises that temp to over 228 f.  New car comp sensors will not work right if you run straight water in them. And also check engine light will kick on wont go in the closed loop and o2 sensor will go bad. The cadilatic converter will get plugged up quicker. Hotter engines vaporize the liquid fuel, cold air mixes with the gas vapor quicker .  Tuning an engine running cold can be a nightmare.
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    Offline 71fish

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    Re: Can an engine run tooo cool?
    « Reply #17 on: June 03, 2008 - 08:23:50 AM »
    My 340 runs 170° all day long. The heat from the headers makes for a warm cockpit, though. So at least one of us is cool...  :bigshades:
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    Offline wally426ci

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    Re: Can an engine run tooo cool?
    « Reply #18 on: June 03, 2008 - 10:16:17 AM »
    Maybe this is where my trouble has been all along, Im running a 160..........  :bricks1: Salvo Auto parts here i come! 

    i think its a 32mm right?

    :working:
    « Last Edit: June 03, 2008 - 10:17:55 AM by wally426ci »
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    Offline 422STROKER

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    Re: Can an engine run tooo cool?
    « Reply #19 on: June 03, 2008 - 03:52:24 PM »
    Thanks guys, i think i'll try the 180 and see how it goes.

    Tom

    Ecellent discussion.

    Goody, You did change your post up a bit on me though.LOL :2thumbs:
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    Tom
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    Offline MEK-Dangerfield

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    Re: Can an engine run tooo cool?
    « Reply #20 on: June 03, 2008 - 07:33:59 PM »
    Tom,

      I got Rally gauges, but my temp. gauge looks like yours.  :grinyes: Even when it's in the 80's or so, my gauge will climb 1/4 way at most.  :screwy: I do use "Water-Wetter" for insurance on my 440, but I have NO clue what thermostat is in there. I know in the colder times I drive it, it barely budges. I better get Perry Mason on the case.  :naughty: I hate to pull out that thermostat, but this situation is interesting..  :eek7:


      Mike
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    Offline 422STROKER

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    Re: Can an engine run tooo cool?
    « Reply #21 on: June 03, 2008 - 09:08:51 PM »
    Who would have thought we would be complaining that our cars ran to cool.....

    Tom :bananasmi
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    Tom
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    Offline Moparal

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    Re: Can an engine run tooo cool?
    « Reply #22 on: June 03, 2008 - 11:45:12 PM »
    Well, you want fuel vapor mist in the engine not liquid bubbles. The air mixes with the vapor more efficient. Fuel injection throws a small spray mist. Vapor mixes with oxygen much quicker then liquid. So when the engine is hot, it promotes vapor.  :clueless: I thought everyone that plays with engines understood that. It all goes into a heated combustion chamber to ignite. If your plugs are fowled and black sooted, you lean it out and step down in jet size, if the tips burn off or are white as new, you add more fuel. :2thumbs:  Oh, and control that spark. See all the help me with my timing posts :bigsmile:

    Thus--- keeping the engine at an optimum heat range will induce vapor so a colder engine is not fuel efficient.  Ever listen to the NHRA announcers when the top fuel racers take too long and the engine gets hotter then it should? It makes more power, changes the tune up and blows the tires off by the wrong clutch adjustment.
    « Last Edit: June 03, 2008 - 11:48:40 PM by Moparal »
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    Offline NoMope Greg

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    Re: Can an engine run tooo cool?
    « Reply #23 on: June 04, 2008 - 12:26:44 AM »
    While not a major concern in this context, correct engine temperatures also play a part in minimizing emissions.  Too cold increases hydrocarbon (HC)  and carbon monoxide (CO) emissions  because of incomplete combustions.  Too high and you get increased NOx emissions.  One of the major driving forces towards the adoption of fuel injection and electronic controls was the increased ability to limit tailpipe emissions.  The fact that modern computer controls also made it possible to now have vehicles with increased horsepower and amazing drivability that just wasn't possible in the pre-smog era is a happy side benefit.  :bigsmile:
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    Offline GoodysGotaCuda

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    Re: Can an engine run tooo cool?
    « Reply #24 on: June 04, 2008 - 07:50:17 AM »
    Quote from: Moparal on June 03, 2008 - 11:45:12 PM
    Well, you want fuel vapor mist in the engine not liquid bubbles. The air mixes with the vapor more efficient.

    And Al...Liquid fuel doesnt burn, vapor does. Just adding.  :wave: The atomization of the fuel from a fuel injector or accellerator pump, etc all atomize the fuel. Once it has been put into a vacuum (inside the intake manifold = under a vacuum) that atomized (sprayed) fuel will boil and turn to vapor. Now this is talking with a fully warmed up engine. Also depends on the volatility of the availible fuel and when it will turn to vapor. 'Winter' blend fuel has a high voatility rating, summer blend has a lower volatility rating. What happens in colder temperature is that vaporized fuel isn't kept hot enough that it can condense back to a liquid form in the cylinder, or even the intake manifold and, of course, it will not burn. Also could foul up your plugs.
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    Offline 422STROKER

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    Re: Can an engine run tooo cool?
    « Reply #25 on: June 14, 2008 - 09:39:34 PM »
    OK long story short since I lost the post i was going to make..

    In about 400 miles of 95 degree heat the car got to 170ish climbing a Small mountain in western ma.  Most of the day it was 155-160.  This was over a 12 hr perios on a cruise.

    Today in 75-80 degree heat the car was running 140 degrees consistantly.  I did about 75 miles and that is it.  I saw 160 when i warmed it up in the driveway but then it went down from there.

    So should i do a 180 stat?  I'm thinking yes as i doubt I'm going to run hot with this set-up.

    Probably run better too.


    Tom :burnout:
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    Offline GoodysGotaCuda

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    Re: Can an engine run tooo cool?
    « Reply #26 on: June 14, 2008 - 09:51:01 PM »
    Yes. 140*, 155* and even 160* is much too cold in my opinion for a consistant run.
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    nivvy

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    Re: Can an engine run tooo cool?
    « Reply #27 on: June 14, 2008 - 10:13:25 PM »
    why dont you just use those water restrictor kits summit sells..... to "tune" your cooling...

    http://store.summitracing.com/partdetail.asp?part=CSI%2D900RP&autoview=sku
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    Offline ted

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    Re: Can an engine run tooo cool?
    « Reply #28 on: June 14, 2008 - 10:21:35 PM »
    sounds like a bad guage.
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    Offline GoodysGotaCuda

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    Re: Can an engine run tooo cool?
    « Reply #29 on: June 14, 2008 - 10:24:26 PM »
    Quote from: 72challorange on June 02, 2008 - 09:21:46 PM
    I'm running a 160 stat along with a summit aluminum radiator and a shroud with HD Clutch Fan.

    Tom :dunno:

    I thought the 422 would run hotter. :clapping:
    I have a new Aftermarket Guage and the factory one reads on the second line.  I put the aftermarket one in because I thought the factory guage was reading low. :scared:



    He's running the factory and aftermarket gauge, both are reading consistant to eachother it sounds
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