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Top speed

2018redhot

By 2018redhot
in Engines & Drivetrain

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dieselfan1 Senior Enthusiast

dieselfan1

Posted
Posted
13 hours ago, Slvijoe said:

Why would your drive shaft blowout?

ITS BALANCED !

Do a search and you'll see what happens.

There's a 99 mph speed limiter on these trucks for a reason .

Not to mention the tires aren't rated for much past 116.

Don't be so dumb.

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swathdiver Senior Enthusiast

swathdiver

Posted
Posted
21 hours ago, Slvijoe said:

Why would your drive shaft blowout?

ITS BALANCED !

So what have you learned since?

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
51 minutes ago, Slvijoe said:

Since what big shot!

Balanced has zero to do with harmonics. Hit the resonant frequency and it will let you know, no matter how well balanced it is. 

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
7 hours ago, Slvijoe said:

Since what big shot!

Since we posted as to the why.

6 hours ago, Grumpy Bear said:

Balanced has zero to do with harmonics. Hit the resonant frequency and it will let you know, no matter how well balanced it is. 

Some folks just don't get it!

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

Not counting the drag strip. And once I passed my 30s. I haven’t driven much past 90 MPH. Where I live I can easily find roads the top speed can be reached. It just doesn’t make sense to me that all my cars can easily reach 120. These mighty 1/2 tons can’t. People will say so what, you don’t need too. Mostly true. I like to know I can. Just like nearly all of us have way more engines we’ll never need. We like to know the powers there.


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Beer Belly Enthusiast

Beer Belly

Posted
Posted

Now, a video of the truck and Speedo at 131 MPH............?

ON EDIT......only kidding, DON'T DO IT !

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
On 8/13/2019 at 7:32 AM, KARNUT said:

Not counting the drag strip. And once I passed my 30s. I haven’t driven much past 90 MPH. Where I live I can easily find roads the top speed can be reached. It just doesn’t make sense to me that all my cars can easily reach 120. These mighty 1/2 tons can’t. People will say so what, you don’t need too. Mostly true. I like to know I can. Just like nearly all of us have way more engines we’ll never need. We like to know the powers there.


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My rear driveshaft, when the tires are down to 2/32nds tread, reaches critical speed at 122 MPH.  Those with pickups with long beds have skinny 1 or 2 piece drive shafts that limits their truck's top speed.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
My rear driveshaft, when the tires are down to 2/32nds tread, reaches critical speed at 122 MPH.  Those with pickups with long beds have skinny 1 or 2 piece drive shafts that limits their truck's top speed.

My 92 Chevy has the original drive shaft. It’s had a blower since new. In the last 15 years it’s been stroked and blown. I know it’s been to the drag strip. I’m sure more than a few times it’s been past the limits placed on these trucks. I’ve fond memory’s of past trucks that would easily past the limits placed on these trucks. Especially Chevy big block trucks, even dodge big block trucks of the past. My brother has a 79 little red truck he raced since new. Mostly with a 440. I’m not advocating speed. Trucks not being able to past 110 mph though is not an improvement in my world.


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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

Funny story. I use to operate a pair of 186,000 horsepower steam turbines. When starting one up you have 4 major harmonic critical points to traverse. Passing through one is done rapidly. Linger and BOOM. We had a guy park on the first order critical once for just few seconds and blew a 300 pound coupling to the runway at the airport five miles away. Took the roof on the compressor house. Tell ya what I think. I think most haven't a cursory understanding of harmonics. 

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
14 hours ago, KARNUT said:


My 92 Chevy has the original drive shaft. It’s had a blower since new. In the last 15 years it’s been stroked and blown. I know it’s been to the drag strip. I’m sure more than a few times it’s been past the limits placed on these trucks. I’ve fond memory’s of past trucks that would easily past the limits placed on these trucks. Especially Chevy big block trucks, even dodge big block trucks of the past. My brother has a 79 little red truck he raced since new. Mostly with a 440. I’m not advocating speed. Trucks not being able to past 110 mph though is not an improvement in my world.


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Well, let's say your trucks had the same driveshafts, those would have to run in the low 11s and into the 10s to exceed those limits.  And they could as you're only there at the top of the run and then quickly slow down.  The Tahoe PPVs are governed for 139 mph.  Being shorter, their driveshafts are good for 5,000 rpms, like the front one in all GMT800, 900 and K2s.  As Marty mentioned, you don't want to hand around in the critical speed range, but rather move past it quickly or stay below it.

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
Well, let's say your trucks had the same driveshafts, those would have to run in the low 11s and into the 10s to exceed those limits.  And they could as you're only there at the top of the run and then quickly slow down.  The Tahoe PPVs are governed for 139 mph.  Being shorter, their driveshafts are good for 5,000 rpms, like the front one in all GMT800, 900 and K2s.  As Marty mentioned, you don't want to hand around in the critical speed range, but rather move past it quickly or stay below it.

I’ve never experienced anything but smooth rides. Otherwise I’d gotten to the bottom of it.


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