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Runs best at 160? On a carbed motor?

Discussion in 'The Garage' started by sled_dog, May 20, 2003.

  1. sled_dog

    sled_dog 1 ton status

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    I have noticed that when I let my truck idle for a minute or two then take it out it runs best right at about 160 degrees on the temp guage. I mean it sounds way different pickup feels better, not WAY better but better. Anyone have ideas why its like this? ANd I mean it really sounds better. Sounds like a different truck. I don't know how to describe it, my friend's dad's 383 Big Block Mopar sounds similar when he gets on it pretty good. I seem to think its the secondaries opening up and for some reason tehy open sooner when its cooler. Anyone have an opinion? I am close to puting a 160 degree thermostat in it.
     
  2. gravdigr

    gravdigr 1/2 ton status

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    What kind of intake are you running? I come from a hot rodding background and cool air = more horsepower. If you are running a cast iron intake you will notice a difference as cast iron holds heat where an aluminum one will shed it faster making the air/fuel charge in the intake runners cooler therefore denser. Many drag racers will keep a bag of ice on their intake until race time to keep it cool. You can also run a high rise intake or put in a carb spacer. If it is running good at that temp I would just check the plugs to make sure they aren't fouling. If you live in an amissions area it may change your emissions for testing running that cool.
     
  3. sled_dog

    sled_dog 1 ton status

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    yeah I checked my plugs after a good drive at normal operating temp(somewhere between 190 and 200) and they were a nice crisp golden brown, looked really good to me. And yeah I run a cast iron intake. I wanted to put a carb spacer we have in our shop on but never got bolts long enough. I will do that in a day or two just to see if it makes a difference.
     
  4. ntsqd

    ntsqd 1/2 ton status

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    I had a 2.0l EAO that ran like a striped a$$ ape at 160* As it warmed up past 160* the mileage got better, but the power fell off.

    Could be the tune you have on/in the engine.
     

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