Love seeing stuff like this

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mckutzy

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I wonder how red hot that exhaust must be from running flat out hard like that...
I'm surprised it had enough torque to over come the rolling resistance... Let alone move it at all...
..
 
anickode

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mckutzy said:
I wonder how red hot that exhaust must be from running flat out hard like that...
I'm surprised it had enough torque to over come the rolling resistance... Let alone move it at all...
..
Click to expand...

I've seen a couple cars done like that. They are usually running something like a centrifugal clutch on the engine with like a 120 tooth or bigger sprocket on the trans input.
 
bob58o

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I did share the 212cc Predator Powered Tow Truck pulling a Semi w/trailer, right?
Want impressive? Watch the first video below.
https://www.youtube.com/watch?v=Z12gbY3nTm0

This shows some more detail of the truck.
https://www.youtube.com/watch?v=7DCpUs0cnt0

---------- Post added at 10:35 PM ---------- Previous post was at 10:28 PM ----------

Looks like a few 212's on that one?
One for the drive train? One looks like it's used for a generator hooked up to an alternator.


Michael Madison
its a chevy s 10 extended cab, with jeep Wagoner rear end, 273 rear ends, the transmission is S 10 and transfer case. 10 teeth on clutch 96 on flywheel, 9.6. to one. tires are 35s. it will run 22 MPH at top speed but gets 70 mpg. (gearing it everything) . i built this truck 4 to 5 years ago. its is extremely tought. i have put hundreds and hundreds of miles in it . 60 mile round trips with my daughter from country to country. ( it weighs 2300 pounds with the generator kit and boom, without it it weights 2200.) Thanks for the impu
 
Kartorbust

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I'm surprised they didn't go deeper gears in the differentials. I would have done like 4.56 in them, just my thought. I'm sure you can get them in those differentials.
 
bob58o

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I'm not sure that it is going to get 70 miles to the gallon.
But that would be cool. I say prove it.
 
Kartorbust

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If it's running at 3600rpm at half capacity it's supposed to have a run time of 3 hours, full capacity, 1.5 hours, so I'm guessing he may get 33mpg on a good day.

Sent from my SAMSUNG-SM-G935A using Tapatalk
 
bob58o

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I started doing the math and realized I don't know much about car/truck drive trains.

35" Tires
22 MPH

If 22 MPH at 3600 RPM, then Final Reduction is 17:1.
He has 9.6:1 Initial Reduction.
2.73 : 1 Rear End Reduction.
26.2 : 1
Transfer case high gear? 1:1?
So maybe it is running in top gear of the transmission, but top gear is 0.65:1????

Or maybe top gear is 1:1?
And 22 MPH is at 5500 RPM valve float???

---------- Post added at 11:23 PM ---------- Previous post was at 11:10 PM ----------

Anyway the tank is what 0.9 gallons?
3 hour run time at 50% Power?
He's moving at 22 MPH.

0.3 gallons / hour
22 miles / hour

0.0136 gallons / mile
73.3 miles / gallon
https://www.youtube.com/watch?v=MzJ2DE_d2HI

So if it only take 50% of the engine's power, geared 17:1, for a 2,200 lb vehicle, with 35" tires, to cruise along at 22 MPH (3600 RPM), then his claims may be true. He might get 70 miles to the gallon?

Is it possible that the engine is only operating at 50% once he gets up to 3600 RPM in top gear and "sets cruise control"? I have my doubts.
 
itsid

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hmm..
let's look at it differently..
22mph =~ 10m/s (9.8 something.. let's stick with ten for ease of calculation)
2200 lbs are one metric ton roughly (998kg or so..again round up to ease things a bit)

Pm = m * g * sin(alpha) * v + m * g * Cr * cos(alpha) * v + Ca * m * a * v + 0.5 * Da * Cw * A * v³

hehe just kidding, let's stick with level road and top speed reached ;)

Pm = m * g * Cr * v + 0.5 * Da * Cw * A * v³
let's make some coefficient and fixed val assumptions
(rolling resistance of 0.02, air density of 1.2, wind resistance 0.9 [it's a truck right] and front area of 3m³)
Pm = 1000 * 9.81 * 0.02 * 10 + 0.5 * 1.2 * 0.9 * 3 * 1000
makes it a grand total of 1800W (1816.2...)

1800Watts.. 1.8kW (2.4hp !)

yeah I guess.. 50% load on the engine to keep rolling (on level ground) is NOT impossible ;)
any dip or incline will increase the value ..
but since there is 1 horse left (half of 7 is 3.5 not 2.4 right ;))
I think his claims are valid to some degree.

getting this massive chunk of steel rolling would take quite a bit (450Nm or something)
having just 11 Nm on the engines PTO means to take off it needs to be geared in the realms of 41:1
but with a gearbox and such... could be...

Okay, there will be a lot of power lost due to friction in the gearing, bearings and stuff as well..
STILL it's maybe slightly exaggerated,
he might need a few more watts to overcome all those friction, maybe it's only 69.6 miles to the gallon..

still it's sounds possible (a frictionless calculation says it's very well possible)

So I'd at least call that plausible ;)

'sid
 
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itsid said:
hmm..
let's look at it differently..
22mph =~ 10m/s (9.8 something.. let's stick with ten for ease of calculation)
2200 lbs are one metric ton roughly (998kg or so..again round up to ease things a bit)

Pm = m * g * sin(alpha) * v + m * g * Cr * cos(alpha) * v + Ca * m * a * v + 0.5 * Da * Cw * A * v³

hehe just kidding, let's stick with level road and top speed reached ;)

Pm = m * g * Cr * v + 0.5 * Da * Cw * A * v³
let's make some coefficient and fixed val assumptions
(rolling resistance of 0.02, air density of 1.2, wind resistance 0.9 [it's a truck right] and front area of 3m³)
Pm = 1000 * 9.81 * 0.02 * 10 + 0.5 * 1.2 * 0.9 * 3 * 1000
makes it a grand total of 1800W (1816.2...)

1800Watts.. 1.8kW (2.4hp !)

yeah I guess.. 50% load on the engine to keep rolling (on level ground) is NOT impossible ;)
any dip or incline will increase the value ..
but since there is 1 horse left (half of 7 is 3.5 not 2.4 right ;))
I think his claims are valid to some degree.

getting this massive chunk of steel rolling would take quite a bit (450Nm or something)
having just 11 Nm on the engines PTO means to take off it needs to be geared in the realms of 41:1
but with a gearbox and such... could be...

Okay, there will be a lot of power lost due to friction in the gearing, bearings and stuff as well..
STILL it's maybe slightly exaggerated,
he might need a few more watts to overcome all those friction, maybe it's only 69.6 miles to the gallon..

still it's sounds possible (a frictionless calculation says it's very well possible)

So I'd at least call that plausible ;)

'sid
Click to expand...

Very Kewl!!!!!:thumbsup:
 
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18:56 was hilarious. I used to do that with my BMX bike. Just point it, push it, and watch caster work for all of 5 seconds.

Perhaps one can weld two coleman bikes together and make a buggy? Hmmmm.
 
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