Although I'm sure a lot of people wouldn't know because TR is not exactly a vast tech source...

My xA has very short gearing. This is combined with an engine that needs to stay within 3-4k rpm to make the car somewhat quick.


My question is this: Is it unsafe for an engine to constantly see those types of revolutions? On the highway, cruising at 70, the engine is turning at about 3700 rpm, which is somewhat "high".

How would this affect engine longevity? A lot? Barely at all?

 

as long as you have lubrication it should be fine. Good motor oil will lubricate it and it shouldn't affect it. I have seen old beamers that are 20+ years old be reved past 6k every day for years and nothing. Hell I do it with my 85 nissan truck heh.

oh yea and we all use amsoil motor oil

-garrett

 

the car manufacturer builds the cars so they last (for the most part) and gears them, and sets the rev limiters according to what they have tested is a safe operating rev range....your toyota will last for a long time, its not a race car.

 

honda's vtec prelude sits at like 4300 on the highway.
THAT SAID
rpm is said to stand for "ruins people's motors'.
is 3700 rpm good for the motor? no; sitting on the side of the road not running is best for the motor. like tom said, though- toyota is a smart company. they know what they're doing.

 

With Toyota reliability, I wouldn't worry about it. You're not under load when you're cruising any way. Plenty of cars cruise at high rpms. DC2 GSR gets up there, and the type R trans is even shorter. My tC's trans will top out at ~130. That's pretty short, and I'm completely not concerned.

 

centrifugal force varies with the square of the speed.

 

They built the car to last they did a crapload of testing before they released it you should be fine

 

How do you make a statement like this:

and follow it with a question like this?

 

What's the matter with my question?

I want to know how engine revolutions effect engine longevity.

I would assume someone who would know best would be a machinist or engineer, or someone who knows about friction, machine part wear, etc.

 

Depends on the engine. If you take a motor, like my Harley motor, with a 3.5" bore and 4.25" stroke and run it at 4000rpm all day, it will most definitely break! Now on the other hand, my Magna has a 70mm (~2.75") bore and 48.6mm (1.91") stroke, that thing can rev to 7,000rpm all day. Of course that's just considering the bottom end, you also have to have a valve train that can handle that type of stress.

Now, like everybody else said, if this is a stock car, of course it's going to last. You think Toyota would make an engine rev high if it wasn't able to handle it for an extended amount of mileage? Just keep the thing oiled at the specified service interval and you'll be fine.