Engine Warm-up???
Your suppose to wait untill the water temp gauge is in the normally operating range before operating if you care alot for your engine.
5W-30 FULLY SYNTHETIC engine oil can be used to improve engine startability in very cold weather.
Your manual reads.....
DO NOT RUN ENGINE AT HIGH SPEEDS(FOR EXAMPLE, BY REVVING IT OR BY ACCELERATING RAPIDLY) IMMEDIATELY AFTER STARTING IT.
5W-30 FULLY SYNTHETIC engine oil can be used to improve engine startability in very cold weather.
Your manual reads.....
DO NOT RUN ENGINE AT HIGH SPEEDS(FOR EXAMPLE, BY REVVING IT OR BY ACCELERATING RAPIDLY) IMMEDIATELY AFTER STARTING IT.
Another reason you should allow the engine to warm up before driving:
Gasoline does not atomize well in cold air. It sticks and clumps to the walls of the intake runners in the head creating unpredictable lean/rich conditions for each cylinder.
Gasoline does not atomize well in cold air. It sticks and clumps to the walls of the intake runners in the head creating unpredictable lean/rich conditions for each cylinder.
EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
What everyone is saying is that driving it ever so softly while warming it up is hardly any different from idling to warm up. However, when you warm-up by driving, you warm up up everything at the same time and you don't foul stuff up by idling.
Don't play off soot build up as no big deal; that stuff cakes up on there (piston tops, valves and the head) and it's really hard to get off. You can't just blast it all out with WOT. When it builds up, it increases your compression ratio, bringing you closer to detonation. It also reduces heat transfer as its not a very good conductor, forming hot spots in the cylinder, thus increasing chances of detonation more. Not to mention the contamination of the oil which affects the whole engine, including the bearings you are trying so hard to protect.
I wouldn't feel all that bad about idling it too long once in awhile, but I wouldn't make a habit of doing it. It's widely accepted that extended idling is not good.
Hypothetically speaking, let's leave out the harmful effects of idling, and just discuss the wear differences between warm up idling and gentle warm up driving. First off, you got to get where you are going anyways, so a car that does 100,000 miles with idle warm ups will see more wear than a car with 100,000 miles that warms up by driving gently, simply because it saw more idle time. A lot more. Just because you idle your car, doesn't mean you have to drive any less farther. While you were sitting in your car warming up the other car is already on it's way. Just by idling all that time and not going anywhere, in those 100,000 miles you probably did 2000-5000 miles of extra wear just sitting there depending on how long your commutes are. Seriously, if you compare the hours spent driving vs. hours spent idling, it will probably amount to that much.
Furthermore, since the engine speeds and loads are still very low with gentle driving the difference is hardly noticeable. The loads are nowhere near the spec'd loads that the bearing can tolerate. However, there is a difference. FACT: 3000 RPMS is faster than 900-1500 RPMS. FACT: Idling is less load than driving. So maybe there will be a little bit more wear during that TIME when the motor is warming up while driving, but since you are spending all that TIME warming up going nowhere, you are seeing more wear if you idle. If I were to guess how much more wear you would see in the time of warm up while gentle driving vs idling, I would say less than 10% for sure, but more like 5% or less.
Out 100,000 miles, a car that drives gently to warm up, probably sees 8000 miles or so of warm up time. So 5% extra wear of 8000 miles is 400 miles. Not much. Hardly worth bothering about.
These numbers are my best guess, but if anyone has more solid numbers, then feel free to take a stab. I am a mechanical engineer, but I don't memorize text books and data charts. I don't think I'm way off, but who knows. But I feel the logic is strong.
I hope this makes sense.
Remember, you still have to get to where you are going. The engine WILL wear no matter what you do. But to warm up 5 mins for a 10 min drive, is 15 min of wear vs. 10 mins (+30 sec maybe) wear without the idling. You are doing more harm than good in this case.
Newbie
Joined: Mar 2005
Posts: 51
Likes: 0
Oddly enough, my mom just bought a 2007 Volkswagen Passat and it says in the owners manual....
"Do not warm up the engine by running it with the vehicle standing still. Drive off as soon as you start the engine. This helps the engine reach normal operating temperatures more quickly, and helps reduce exhaust emissions."
So, as someone else stated previously, I think this is mainly an emissions thing. It also goes on to say that you should not drive at high RPM's while the engine is cold. When it's in the 20's and teens around here like it has been the past few days, I let my evo warm up until the temp needle starts moving. Then I take it nice and easy until it's up to operating temperature.
"Do not warm up the engine by running it with the vehicle standing still. Drive off as soon as you start the engine. This helps the engine reach normal operating temperatures more quickly, and helps reduce exhaust emissions."
So, as someone else stated previously, I think this is mainly an emissions thing. It also goes on to say that you should not drive at high RPM's while the engine is cold. When it's in the 20's and teens around here like it has been the past few days, I let my evo warm up until the temp needle starts moving. Then I take it nice and easy until it's up to operating temperature.
Newbie
Joined: Nov 2003
Posts: 7
Likes: 0
From: NH
more important
I can't believe that no one else mentioned this, but I warm my car up so my kids don't freeze. I've had this evo for a short time, but my wife's jetta has 135k, volvo wagon has 163k and the truck I just sold had 122k - all spend a few minutes warming up fully before driving in the winter. Just a few seconds in warmer weather. None have had any engine issues at all, and since I want to stay married, I'll continue to warm the car up!
Heater in evo doesn't seem to be too strong
Heater in evo doesn't seem to be too strong
The bearings will not wear prematurely by keeping it under 3000 RPMS or so. It's not that big a deal to drive the car to warm up. Bearing wear is a function of speed and load. This function is also non-linear and goes up substantially when the loads and speeds increase. The difference between 1300-1500 RPM warm-up idle and and driving it at below 3000 RPMS will make a negligible difference. The loads experienced when driving it like this will also be much lower than normal driving. You probably don't use more than 10hp driving it this way.
What everyone is saying is that driving it ever so softly while warming it up is hardly any different from idling to warm up. However, when you warm-up by driving, you warm up up everything at the same time and you don't foul stuff up by idling.
Don't play off soot build up as no big deal; that stuff cakes up on there (piston tops, valves and the head) and it's really hard to get off. You can't just blast it all out with WOT. When it builds up, it increases your compression ratio, bringing you closer to detonation. It also reduces heat transfer as its not a very good conductor, forming hot spots in the cylinder, thus increasing chances of detonation more. Not to mention the contamination of the oil which affects the whole engine, including the bearings you are trying so hard to protect.
I wouldn't feel all that bad about idling it too long once in awhile, but I wouldn't make a habit of doing it. It's widely accepted that extended idling is not good.
Hypothetically speaking, let's leave out the harmful effects of idling, and just discuss the wear differences between warm up idling and gentle warm up driving. First off, you got to get where you are going anyways, so a car that does 100,000 miles with idle warm ups will see more wear than a car with 100,000 miles that warms up by driving gently, simply because it saw more idle time. A lot more. Just because you idle your car, doesn't mean you have to drive any less farther. While you were sitting in your car warming up the other car is already on it's way. Just by idling all that time and not going anywhere, in those 100,000 miles you probably did 2000-5000 miles of extra wear just sitting there depending on how long your commutes are. Seriously, if you compare the hours spent driving vs. hours spent idling, it will probably amount to that much.
Furthermore, since the engine speeds and loads are still very low with gentle driving the difference is hardly noticeable. The loads are nowhere near the spec'd loads that the bearing can tolerate. However, there is a difference. FACT: 3000 RPMS is faster than 900-1500 RPMS. FACT: Idling is less load than driving. So maybe there will be a little bit more wear during that TIME when the motor is warming up while driving, but since you are spending all that TIME warming up going nowhere, you are seeing more wear if you idle. If I were to guess how much more wear you would see in the time of warm up while gentle driving vs idling, I would say less than 10% for sure, but more like 5% or less.
Out 100,000 miles, a car that drives gently to warm up, probably sees 8000 miles or so of warm up time. So 5% extra wear of 8000 miles is 400 miles. Not much. Hardly worth bothering about.
These numbers are my best guess, but if anyone has more solid numbers, then feel free to take a stab. I am a mechanical engineer, but I don't memorize text books and data charts. I don't think I'm way off, but who knows. But I feel the logic is strong.
I hope this makes sense.
Remember, you still have to get to where you are going. The engine WILL wear no matter what you do. But to warm up 5 mins for a 10 min drive, is 15 min of wear vs. 10 mins (+30 sec maybe) wear without the idling. You are doing more harm than good in this case.
What everyone is saying is that driving it ever so softly while warming it up is hardly any different from idling to warm up. However, when you warm-up by driving, you warm up up everything at the same time and you don't foul stuff up by idling.
Don't play off soot build up as no big deal; that stuff cakes up on there (piston tops, valves and the head) and it's really hard to get off. You can't just blast it all out with WOT. When it builds up, it increases your compression ratio, bringing you closer to detonation. It also reduces heat transfer as its not a very good conductor, forming hot spots in the cylinder, thus increasing chances of detonation more. Not to mention the contamination of the oil which affects the whole engine, including the bearings you are trying so hard to protect.
I wouldn't feel all that bad about idling it too long once in awhile, but I wouldn't make a habit of doing it. It's widely accepted that extended idling is not good.
Hypothetically speaking, let's leave out the harmful effects of idling, and just discuss the wear differences between warm up idling and gentle warm up driving. First off, you got to get where you are going anyways, so a car that does 100,000 miles with idle warm ups will see more wear than a car with 100,000 miles that warms up by driving gently, simply because it saw more idle time. A lot more. Just because you idle your car, doesn't mean you have to drive any less farther. While you were sitting in your car warming up the other car is already on it's way. Just by idling all that time and not going anywhere, in those 100,000 miles you probably did 2000-5000 miles of extra wear just sitting there depending on how long your commutes are. Seriously, if you compare the hours spent driving vs. hours spent idling, it will probably amount to that much.
Furthermore, since the engine speeds and loads are still very low with gentle driving the difference is hardly noticeable. The loads are nowhere near the spec'd loads that the bearing can tolerate. However, there is a difference. FACT: 3000 RPMS is faster than 900-1500 RPMS. FACT: Idling is less load than driving. So maybe there will be a little bit more wear during that TIME when the motor is warming up while driving, but since you are spending all that TIME warming up going nowhere, you are seeing more wear if you idle. If I were to guess how much more wear you would see in the time of warm up while gentle driving vs idling, I would say less than 10% for sure, but more like 5% or less.
Out 100,000 miles, a car that drives gently to warm up, probably sees 8000 miles or so of warm up time. So 5% extra wear of 8000 miles is 400 miles. Not much. Hardly worth bothering about.
These numbers are my best guess, but if anyone has more solid numbers, then feel free to take a stab. I am a mechanical engineer, but I don't memorize text books and data charts. I don't think I'm way off, but who knows. But I feel the logic is strong.
I hope this makes sense.
Remember, you still have to get to where you are going. The engine WILL wear no matter what you do. But to warm up 5 mins for a 10 min drive, is 15 min of wear vs. 10 mins (+30 sec maybe) wear without the idling. You are doing more harm than good in this case.
I can't believe that no one else mentioned this, but I warm my car up so my kids don't freeze. I've had this evo for a short time, but my wife's jetta has 135k, volvo wagon has 163k and the truck I just sold had 122k - all spend a few minutes warming up fully before driving in the winter. Just a few seconds in warmer weather. None have had any engine issues at all, and since I want to stay married, I'll continue to warm the car up!
Heater in evo doesn't seem to be too strong
Heater in evo doesn't seem to be too strong
Oh for GOD sakes, Toughen up, Kids will live . Throw a jacket and gloves on them for crying out loud. your the reqason for canceling school too when it gets cold but lets the kids go to the mall instead waaaahhhhhhh GODD>
P.S didn't you like snow days back in school?
