Lowest tachometer "red line" indicator you've seen

[L_Sludger]

As it goes in the title, what's the lowest red-line point you've seen on a car? (or truck)
I recall that the old BMW 325e motor had a redline somewhere around 4500RPM.. hahah.

 

[Chris142]

2100 in a petetbilt

 

[01rangerxl]

On the 7.3L and 6.0L diesel Super Duties I've driven it was around 4K RPM. That's the lowest I can remember seeing.

 

[Klutch9]

On the 4.0L I-6's used in the Jeeps, I recall the redline being somewhere just under 5,000 rpm. That's the lowest I've ever personally seen. Or maybe it was right at 5,000... I can't remember.

 

[55Test]

I think something like 4500 in an old AMC Eagle

 

[TallPaul]

My '95 F150 4.9L inline six didn't come with a factory tach, but knowing the power band of that engine, when I bought a tach, I got one that went only up to 4000 rpm and usually shifted by 3600 when rowing the gears. Those engines really didn't give anything above that in stock form.

 

[Loobed]

I think it was 3500 RPM in a large diesel truck.

 

[Nick R]

The Jeep. max automatic shift at 4800, redline at 5,000, fuel cutoff at 5,300. When I drove it I usually shifted manually because it made quite a bit of power between 4800 and 5,250RPM so I would push it to help cut the 0-60 time down from 22 seconds =|

 

[Scott_Tucker]

The longer the stroke, the lower the redline.

 

[Nick R]

Originally Posted By: Scott_Tucker
The longer the stroke, the lower the redline.


Not necessarily true. My cruze has a relatively long stroke not to mention very small displacement (1.4L and undersquare) but redline is still 6,500RPM.

 

[Texan4Life]

Originally Posted By: Chris142
2100 in a petetbilt


+1 lowest "red line" I have seen are in class 8 trucks

tho with HD diesels (many don't have a red line) they could run there all day if if you wanted them to.

 

[Lead Shoes]

Originally Posted By: Scott_Tucker
The longer the stroke, the lower the redline.


Lol, not true...

The lowest I have seen is around 3k in a 24v 5.9 cummins, it was a long time ago I drove it so I'm not sure the exact #.

 

[Shannow]

That thinking is 80 years old, where the "maximum piston speed" was known...we've gone way way beyond that.

My BJ42 Landcruiser was 4k
My 3.0L Nissan is 4,500

Some of the Holdens that I've owned showed 5,500 and 6,000, but with the factory cams and carbs just wouldn't get there without feeling like they would explode.

 

[eljefino]

My dakota 3.9 says 4800...

 

[user52165]

This - a current BITOG thread:

http://www.bobistheoilguy.com/forums/ubb...;gonew=1#UNREAD

http://www.vincelewis.net/bigengine.html

102 RPM

 

[SLCraig]

I think I remember seeing 4500 on a Fox Body Mustang. (302)

 

[TFB1]

Originally Posted By: Nick R
Originally Posted By: Scott_Tucker
The longer the stroke, the lower the redline.


Not necessarily true. My cruze has a relatively long stroke not to mention very small displacement (1.4L and undersquare) but redline is still 6,500RPM.


Agreed, though I doubt you'll ever find a engine with a 5" stroke with a 6500 RPM redline... Few modern engines even have a 4" stroke so it's basically a moot point...

Originally Posted By: SLCraig
I think I remember seeing 4500 on a Fox Body Mustang. (302)


The T-Birds with basically the same bottom end were redlined at 4500, with good heads I've spun those engines to 6500 RPM+ & never had a issue...

 

[OVERKILL]

Originally Posted By: Chris142
2100 in a petetbilt


Yup, this. Except for me it was a Western Star.

 

[OVERKILL]

Originally Posted By: SLCraig
I think I remember seeing 4500 on a Fox Body Mustang. (302)


Nope, was 5,500 or 6,000. The "yellow" started at 4,500.

 

[SEMI_287]

2500 in a Thomas C2 school bus with the Cummins ISB 6.7.