Engines under load from a cold start

Pennzoil motor oil
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Revving an engine to warm it up faster is not smart for many reasons.

For long engine live keep the rev's as low as possible and let the engine warm up at it's own rate. And if you ask your engine, she'll (they're all female or no?) request that you not turn on the heater (yes to the defroster but only if necessary) until the coolant is at least half way to normal. This will noticeable shorten the time it takes for the coolant to get up to temp'.

And if you have an oil pressure gauge, always keep the rev's below the oil pump by-pass point during the warming up process.
 
yeah if i use any type of heat it wil double the time it takes to get to operating temp. my first 2 miles usually are with no heat at all.
 
I appreciate all replies, and if it didnt involve posting up a link (PM me if you want to see it that bad) I can produce video evidence that it was "warm enough" (?) outside that the SUV started up at 800-1000RPM.

And yes, stepmom is elderly and wanted "toasty warm" SUV and i accomplished that. Loaded it up, and the revs i HOPED got coolant flowing faster.. FWIW, it worked as i accomplished it and i was done revving it the few times by the time they asked me (rudely) not to do that.. and then, the argument.

I have the two links for those that want to see. Just not posting because i know links to videos that can embed =
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You don't have to look far or hard to see that only someone with limited or no knowledge of gasoline engines would do 3000rpm on a cold start. Other than a dire emergency which I don't see that you had whomever was going to drive the vehicle had 2 choices, either drive cold till warmup or stay in the house until sufficient time had passed & that doesn't mean over 10 minutes.
 
Originally Posted By: mgm13
You don't have to look far or hard to see that only someone with limited or no knowledge of gasoline engines would do 3000rpm on a cold start. Other than a dire emergency which I don't see that you had whomever was going to drive the vehicle had 2 choices, either drive cold till warmup or stay in the house until sufficient time had passed & that doesn't mean over 10 minutes.


Precisely. I had a timeframe of 5-10 minutes to get the "windows defrosted and car hot." I chose to rev the engine for short times, to get 1. coolant flowing and 2. Some heat for the blowing defrost, which i felt may have taken heat AWAY from warmup. My calculations were correct, i met the timeframe. it was AFTER i had closed the door that Stepdad THEN came out, said, "dont rev it." He was not informed my mom required me to "heat the car up quickly." This situation was not t he normal. EVERY other time, the key is turned and the car is in drive within one second of the key being turned, and the NORMAL "under load" scenario is employed. I sought to get the fluids circulating "more" (hence, vehicle in drive, foot on brake.. of course i did not touch the gas when that was the case) then back into P.

My stepdad is elderly as is my stepmom, and can be irrational. He told me about how it will "idle higher if it needs to." No need to tell him if he is in one of his moods, but the vehicle did NOT idle higher upon starting.. so apparently it was warm enough that my short revs did get more coolant flowing. I told him i "recreated 'under load' as best i could before she got out," and it worked. Of course, we still argued.

Having been in this SUV many times, i can tell you it warmed up faster, slightly not dramatically but i achieved warmup with the vehicle not moving that would normally happen with vehicle in motion, which is what was required of me from stepmom. They both own the SUV. So.
 
[/quote]
So you are saying that i was NOT helping it warm up? i sent you the video link. I saw the temp needle going up [/quote]

Has no one ever told you that that is the best way to blow up a cold engine? I have seen a few engines throw a piston right through the oil pan doing that. Oil does not flow to the parts of the engine when it is cold / congealed. Racing a cold engine raises the heat quickly because of the extra friction.
 
I personally would have just idled the engine for longer and let it warm up slow. While not a perfect method i feel it would have been better than what you did.

Although i might sound crazy, i never go above 2000 rpm until i've driven for at least 15-20 minutes. Water temp has to hit 70 before i take off. I just have an OCD when it comes to cold.

$.02
 
I haven't driven my pickup in about 3 weeks. I started it up in the shop (the thermometer on the wall said 7 degrees), backed out, went out the driveway, and within a minute was at 55 mph. It didn't hurt a thing and I'm sure I was at or close to 3,000 RPM soon after I left the drive, within a minute or so of starting the engine.

25 degrees isn't that cold, and it certainly won't hurt it to get it to 3,000 RPM's soon after starting it. I've always warmed vehicles up by driving them, and never worried about staying below some random, imaginary number.


Originally Posted By: OVERK1LL
You rev'd an engine that was at -25 to 3,000RPM.


Sit back, take a deep breath, and read the original post carefully. It says ~25, not -25. The tilde means "approximately", not "minus" and that's a 50 degree difference from what you're barking about.

Sheesh.
 
I feel the computer will run it at the rpm per temperature on a cold start. If they wanted a higher rpm, they would have incorporate that into the management system.
I let it run on cold starts long enough for me to get the windshield clear, scrape others if needed, get myself settled in, sip that coffee, drive easy till the gauge is up to operating temp, then let er rip normal.
 
Man, don't chicken out...Put a brick on the gas pedal, let 'er rip.. She will get warm in a hurry..LOL
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I would punch someone if they EVER did that to my car or truck..or they'd get smacked with my Mag light. End of story..plain and simple..Were you drinking?? I'm seriously curious
 
Originally Posted By: DrDusty86
I would punch someone if they EVER did that to my car or truck..or they'd get smacked with my Mag light. End of story..plain and simple..Were you drinking?? I'm seriously curious


You are referring to if someone put a brick on the gas pedal, right?
 
No dude..if they "rev'ed" my equipment... are you ok? How old are you? 12, 13..talk to your parents. They should teach you right from wrong.. I'd hope
 
Originally Posted By: DrDusty86
Guys this has to be a joke....


No, it isnt. I got into it with my stepdad over if revving it was warming it up, and they could provide no real reason except to inflate ego. We dont like each other and may fight someday.

The concensus is that it wasnt that bad and i was right.
 
I can see how rising the RPM a bit higher then the normal cold idle would help speed up the warm up but putting it in gear while holding the brake and trying to simulate an engine under load is plain stupid.

My 98 Camry's cold idle is around 1,900 for a few seconds and then it drops off to 1,500 where it will stay for about a minute and then slowly go down as temps come up.

When I want faster heat / warm up, I'd keep the revs @ 2,000 for a minute of two and that will bring heat outta the vents in a hurry. 213,000 miles on it and I've been doing this since almost day one after buying the car. 90% of the time its start it and go, regardless of weather. Runs just fine.
 
no offense, but I'd have issues with the way you treat other's stuff..it sounds like you have absolutely no respect for other people's stuff and he won't put up with it..
 
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