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Open Roads Forum  >  Tow Vehicles

 > Gas engine revs ?

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wolfcat1

Vidor, Tx.

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Posted: 12/01/11 07:43pm Link  |  Print  |  Notify Moderator

I keep reading a gas engine makes its max hp, and torque at high rpm's...So how do you know when you are in the "safe" zone, and not about to fry an engine?
thnks,
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Jerrybo66

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Posted: 12/01/11 07:47pm Link  |  Print  |  Notify Moderator

It's called, read the tach, seat of the pants or common sense...Good luck.. IMO..


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Jerry9n

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Posted: 12/01/11 07:56pm Link  |  Print  |  Notify Moderator

With the advent of overdrives, people have almost gotten paranoid about getting a short stroke V8 above 1800 rpm or so. In the old days, I had a 57 Chev with 4.11 gears and it was wound up all the time.

Bottom line most of these engines will red line at about 5-5500 rpm. I believe the engine has an rpm limiter built into the computer. If you pull any of these 5-5.7 liter engines in the 2500 rpm range, it should be happy all day, in fact probably happier than trying to lug it below the torque/hp curve at a lower rpm.

I run in 3rd at about 2200 rpm for 8 hours at a time. Engine is much happier there than in OD (4th).

Just my opinion from an over the hill gear head.


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PapPappy

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Posted: 12/01/11 08:01pm Link  |  Print  |  Notify Moderator

Being that most of the RVs out there are automatic transmissions, it's almost impossible to over-rev the engine when you have it in gear.

Sure, you'll drop down a gear or two when you stomp on it, but my guess would be that you only pick up a thousand RPMs or so...and you are geared such that you won't over-rev when you are in the higher gears, since you'd have to be going about 150 mph or so....

As mentioned, you should be fine, just running the engine and heading up that hill.....
My V-10 loves to have the gas pedal just about to the floor on a steep hill, and I've never come close to 5,500 rpms.


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coolbreeze01

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Posted: 12/01/11 08:03pm Link  |  Print  |  Notify Moderator

With a modern engine, when the tac quits climbing, its time to grab a gear [emoticon]


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srt20

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Posted: 12/01/11 08:04pm Link  |  Print  |  Notify Moderator

If it starts loosing power, and sounding REAL sickly, back off about 200 rpms, cuz your floating the valves.

Ive heard and felt valves float. Its kinda cool actually.

reno82

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Posted: 12/01/11 08:07pm Link  |  Print  |  Notify Moderator

It doesn't always sound pretty but climbing a grade at 4000 rpm is fine. Keep your oil fresh, watch your motor temps and don't sweat it. Going through Utah and Nevada last summer I pulled several grades at 4000 rpm in 112 degree heat. Transmission temps and motor temps were fine the whole trip.

pitch

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Posted: 12/01/11 08:10pm Link  |  Print  |  Notify Moderator

jerrybo66 has it right. I will rephrase what he has said though. Your tachometer has colored band on it along with the hashmarks. If the needle is in the upper yellow or into the red you are over revving it.
I say it takes machine sense not common sense. Machine Zen you might say. Listen to your machine, it is talking to you constantly, you need to know your truck to understand it own particular language.

enblethen

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Posted: 12/01/11 08:23pm Link  |  Print  |  Notify Moderator

I would not push the engine as hard as others have posted. While towing I would not run much above the torque spec for your engine.
You need a tach that can be easily read. To run continually in the "yellow" or "red" can shorten the engine life quickly.


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APT

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Posted: 12/01/11 08:47pm Link  |  Print  |  Notify Moderator

The engine computer will not let it rev too high. Just try to keep it below 3000rpm until the engine is at normal operating temperature.


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