there's basically no load on the engine when reving so it should be much easier on the engine than driving and pulling the wieght of the car and passengers. If your engine has problems obviously just running it could be harmful though.

 

it runs fine. its hard as hell to get started because the choke is set to tight once it starts it runs perfectly. my dad just has this idea that i shouldnt rev it without a load because somthing or other

 

1) So adjust the choke. Easy fix.

2) Is this the dad who refuses to buy the service manual? You need to politely, respectfully, find a way to listen to him less, at least about auto repair.

 

Hmm, Is there a fair amount of air movement through that garage? Call me overly cautious,but with it parked a$$ in I'd be a bit worried sitting in there with it running. Even with the garage door opened you can still get a bit of exhaust buildup inside there.It may not be enought to make you pass out and die but Trust me it's not helping you any.

 

wait a minute....

Isn't your Dad the guy that liked to drive 70 mph in first gear? But now he's afraid to rev the engine to 3000?

 

i do that almost every day....but im on my Hayabusa

 

im doing a major tuneup soon and replacing the ignition with a pertronix i will retune the carb and choke at that time. second he bought the book he just had to call a friend of his to see if it was the right one for some reason. third he only did 70 in first once at the urging of a friend. hes good at doing the auto repair but hes overworked and doesnt like to go into the garage because look at it its so small you cant move and its always a mess. he kept that car running and on the road for 15 years by himself working 2 jobs so i respect his opinion. if he says not to rev it like that theres probably a reason he was told not to and im trying to figure out if its true that you shoudnt or if he was given bad info. the book should be here tomorow and then i can pull the trans apart. that whining you hear in the backround is the trans bearings. and the garage is fine the wind was blowing through the door and the cieling is 15 feet high with 2 large vents at the top. the garage is taller than it is wide.... FAIL.

 

You have the right idea in this statement....you are respecting your fathers opinion...you have a very mature attitude...

I think you have your various answers for revving an engine under load, so i won't address it other than saying ... I once broke the crank in my dads jetboat with no load on the engine.....

 

Only if you drive a Chevy.

 

The only problem with revving the motor with no load is it is easier to over rev it. The RPM's go up fast, and if you are not paying attention it may get to a place you don't want to go. I think that is probably why he was saying that.

 

It's only the right book if it looks like this:

 

I've always heard it's hard on a heater core to just sit and rev like that.

 

I have the same manual 22GT is referring to. Great resource!

 

thats the book i got. and i went really slow so it wouldnt have over reved. the car doesnt like having the throttle snapped so i dont have to wory about that.

 

thats the book i got.
You'll be in good shape from now on, then.

and i went really slow so it wouldnt have over reved. the car doesnt like having the throttle snapped so i dont have to wory about that.
Once you start tuning it up as per that book it'll snap just fine, so be careful.

 

Educate me! What's a snap?

 

bliping the throttle. snaping it open and closed fast.

 

seriously does anyone know if its bad or not.

 

My dad told me something similar years ago when he caught me revving his 94 mustang in the garage when i was 18 or 19 years old.

The issue as I understand it is this:

If you ever watch your engine when you rev it you will notice that the entire engine will rotate due to the torquing of the internal components. This exact same thing is happening internal to the engine. The crank shaft/cam shaft are both shifting toward one side of the bearing when this occurrs( I can't remember clockwise/counterclockwise at the moment)

All the rotating components in an engine ride on a layer of pressurized oil to prevent metal to metal contact. Revving the engine with no load allows this torquing to occur very rapidly and can allow a non-zero point of time where there is metal to metal contact between the crank/cam and the journal bearing before the oil pressure catches up at the bearing/rotating assembly interface.


When the engine is under load the rate of rpm rise is limited by the weight of the car/drivetrain etc and this issue is minimized/eliminated for the most part. Likewise if you rev it up slowly to whatever rpm, you won't have this issue as you won't cause that rapid torquing occuring.

All that being said, doing it once in a while is probably not going to cause any issues that are any worse than the wear that is placed on the rotating interfaces when you start your car(0 oil pressure at journals at startup).


Jafo

 

so if i do what i was doing in the video it should be just like i was driving it in terms of wear

 

If this is a question, then i believe i gave you all the information you need to determine the answer. I can't see your video as I am at work and wherever you are hosting it is blocked.

As far as starting a laid up car every now and then goes, that is a different discussion. I think its a good idea to circulate the fluids, heat it up to not for 10-15 minutes and keep gas flowing through the carb to prevent varnish buildup.

Some others say park it cover it for the winter, disconnect and put the battery on a tender and forget about it until spring. I had read that starting and warming up the car and area around the car raises the moisture carrying potential of the air(this is true), which can cause a localized high humidity area around the car and in the engine which can cause premature wear/rust and moisture to build up in the oil since the car isn't being run regularly to outgas the water vapor back out. Logically, this makes some sense, but is this one of those things where one choice gives you a 150, 000 mile engine and the other gives you 145000? I don't know if any statistically significant difference can be proven on this count. I do know that gas turns to varnish when it sits, and fluid mixtures(antifreeze) tend to stratify when not mixed regularly.

Jafo

 

Well if the car is just sitting in the garage and not on the road its good to start it up and rev it then to just let is sit and rot that's what I've been told and its yet to fail me but becareful not to over rev unless you have deep pockets to pay for the repares well goodluck

 

i break it i fix it.already did that once after this happened due to the valves freezing and its actualy better to leave it alone if you dont plan on driving it but i plan on doing work to it when new parts come in and i need it able to start without work so its easyer just to start and run if for a half hour every 2 weeks to recirculate coolant. and get fresh gas into the carb.

 

There's an excellent auto museum near here, Dan Gurney cars, Trans-Am BOSS Mustangs, etc. All the engines are turned or started once a month.

 

What do you think they do on dynos? Hold it below 3000 rpm?

Whatever revs you use while driving are just fine sitting still.

 

What do you think they do on dynos? Hold it below 3000 rpm?

Good point. But even before they Dyno it I'd imagine they let the engine run and warm up before getting on it. Got to let all the oil and fluids get circulating.

IMHO, I think the original poster made the right moves - Let the car warm up a bit, started with a couple gradual slow revs. And then snapped it a few times. Sounds good to me. The longer the car sits between starts, the more I'd let it run and warm up before i do this though. Let it get "comfortable" again before you get on it.

 

Running under load is not the same as running with no load.

 

ordinarily i start it move the other vehicles get in and go up and down the driveway a bunch of times but since the trans is going (im building a new one) and the garage has snow in front of it i couldnt do that so i ran it for about a half hour total and reved it a few times

 

Geez, when this forum become "Romper Room"?

I tried to stay away, but everyday this stupid post is at the top again.

It doesn't hurt anything, it doesn't hurt anything, it doesn't hurt anything.

If revving a car in neutral caused problems, you really think formula 1 teams would damage their multi hundred thousand dollar engines playing music?

Starts about 20 seconds in:

 

Geez, when this forum become "Romper Room"?

I tried to stay away, but everyday this stupid post is at the top again.

It doesn't hurt anything, it doesn't hurt anything, it doesn't hurt anything.

If revving a car in neutral caused problems, you really think formula 1 teams would damage their multi hundred thousand dollar engines playing music?

Starts about 20 seconds in:

YouTube - God Save The Queen (on a Renault F1 V10!)

Hmmm, so this is compulsory reading? So you're the world's expert?

 

wtf

 

I didn't read the whole thread but honestly it sounds like something I would tell my kid if he was annoying me sitting in the garage and revving the engine