Redneck low budget dyno?!?!

[JamesG]

WTF?
http://www.josephthompson.net/austin/MVC-034S.JPG
http://www.josephthompson.net/austin/MVC-035S.JPG
http://www.josephthompson.net/austin/MVC-036S.JPG
http://www.josephthompson.net/austin/MVC-037S.JPG
http://www.josephthompson.net/austin/MVC-038S.JPG
http://www.josephthompson.net/austin/MVC-039S.JPG

[Levis Classic]

Where do you guys from Arkansas come up with this shit?

[Flat Ernie]

I'll bet it was interesting backing that thing up onto those tires! http://www.jalopyjournal.com/ubbthreads/images/graemlins/shocked.gif

I wouldn't want to see that thing running at speed & slide off the tires either! http://www.jalopyjournal.com/ubbthreads/images/graemlins/blush.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/shocked.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/blush.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/shocked.gif

Who knows - maybe he runs a water pump & thats his water pressure for the double-wide! "Hey Billy-Joe, I'm fixin' ta take a shower - go set the cruise control on the Camaro at 50 - last time you had it on 80 & damn near ripped the skin off'n me!" http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

http://www.jalopyjournal.com/ubbthreads/images/graemlins/cool.gif

[geno_86ed]

From the looks of it he sold his autographed picture of Tom Wopat and John Snider and bought a used IROC (the dirt head car of choice).

When picking out his limo tent, and new set of rims he forgot that he needed to get a new pump for his well. So junk out the old winch truck, attach the PTO to the pump head and TADAAAAA!

Back your car on the tires, put it in gear, block the front tires with rock from your yard, slam it in gear and take your monthly shower. Damn you are smart!!
http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif
Geno

[geno_86ed]

Damn it Flat Ernie, you beat me to it.

Geno

[Winfab]

A crude execution of a device with which to execute one's self.

[Flat Ernie]

[ QUOTE ]
Damn it Flat Ernie, you beat me to it.

[/ QUOTE ]

Great minds? And I type like a girl... http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

http://www.jalopyjournal.com/ubbthreads/images/graemlins/cool.gif

[bigron]

do you think he's got a mullet too?

[desertratrodder]

Theres actually a guy out here that uses a Diesel Mercedes as his well pump drive. The whole car is sitting there and its adapted to the rear drive axle...
I'm sure it was cheaper than a real pump drive setup.
Redneck ingenuity I guess.

[Dreamweaver]

That one pic looks like he has a strain gauge attached between the chains holding the car and the pipe concreted into the ground.

Looks like a Utah plate on the Camaro.

[Radman]

That is cool! Just 'cause your to pussy to try it dosen't make it hillbilly! http://www.jalopyjournal.com/ubbthreads/images/graemlins/shocked.gif

[JamesG]

What I'm trying to figure out is how he gets the car up on the other tires?

[Radman]

[ QUOTE ]
What I'm trying to figure out is how he gets the car up on the other tires?

[/ QUOTE ]

Engage the brakes.

[uncleAud]

so how does it read and record the results...whats the set up anybody know that?

[Radman]

[ QUOTE ]
so how does it read and record the results...whats the set up anybody know that?

[/ QUOTE ]

STRAIN GAUGE.

[Dreamweaver]

Yes, it's a dyno.

Here's basically how a strain gauge works.
web page (http://science.howstuffworks.com/framed.htm?parent=weigh-station.htm&url=http://www.measurespec.com/tips/principles.htm)

[Fraz]

Look closely at this pic. What's missing? (HINT: Look at truck tire and rim)
http://www.josephthompson.net/austin/MVC-038S.JPG

[ELpolacko]

Hey Fraz, ever had tandem Bud wheels apart? I don't think you have. It looks like there are no lug nuts on there, BUT they are studs that hold the inner wheel on while giving thread to hold the outer tire on.


This thing is crude but I like it so far. Any more information on this guys set up? It appears the air brakes are still functioning on the tractor axle and it seems as if the pinion may be hooked to a pump or something to give the resistance of the "dyno". Either that or he is using brake pressure from the tractor axle, that would explain the strain gauge attached to the chain. Pretty creative stuff here guys. NUTS to all you who poo-poo this stuff, Camaro or no Camaro.

[59BuickWagon]

Arkansas? Looks like a Utah plate.

[four-thirteen]

somebody better call the thought police, and stop this guy. he is thinking on his own, and we just can't have that....... no one really needs a dyno anyway, just add up all the HP numbers from the add on stuff you bought. 20 HP for the exhaust, 15 for the air cleaner.....

[metalshapes]

Does the axle have to be hooked up to anything or would it be possible to use the axles brakes for resistance?

Edit,
Oh, you already said that... Nevermind...

I wouldn't mind having a Dyno in my backyard, but I think it might piss my neighbours off... http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

[Fraz]

Acutally changed quite a few an inner tandem bud and non bud tires/wheels when I was working at a local salvage yard/wrecker service, and none looked like that one. However it's late and I'm tired and the pic still looks like the wheel's just there with no nuts or anything holding it up.

Time to go to bed, I'm getting grumpy and argumentative. G'night.

[ELpolacko]

Fraz man, not trying to argue. Just didn't think you have seen this set up before.

There is a stud sleeve that holds the inner wheel on like this....

http://www.walkercoach.com/images/innercap%20r.jpg

then the outer wheel goes on and a lug nut holds it on.

sort of like this....

http://www.walkercoach.com/images/photo_stud_pilot.gif


http://www.jalopyjournal.com/ubbthreads/images/graemlins/wink.gif

[burndup]

now, that strain guauge attached to the tether WOULD NOT truly give rear-wheel horsepower, would it? Just the amount of pulling force, which is whatever is leftover above the force required to spin those truck wheels... which is probably an "uncalibrated unknown."

So, How the F do you get any sort of useable data outta this thing? Only forseeable way is relative before and after runs at the time of adding bolt ons.

?

[metalshapes]

It would be possible to measure the Torque wouldn't it?
And the Horsepower is calculated with the Torque and the RPM.
It would probably be a bitch to calibrate though...
What kind of grip would the rear tires have on those Truck tires, would that be better or worse than metal rollers?

[burndup]

torque is a function of twist, rotation, that would have to be read with some sort of a sensor on that truck axle...

Hey! who the F here knows how real dydno's work, school us!!!!

[four-thirteen]

the strain gauge measures force. and we can measure the velocity of the wheels. force times velocity equals power. just measure these two quanities and we can get a horse power measurement with a little bit of algerbra.

OR

we can use the strain gauge to measure the torque at the rear wheels. then we can measure the RPM at the rear wheels. RPM times Torque equals horsepower.

there is no rocket science to this, you could get this all out of a high school physics book. and burndup, you need to read one of those....

you could make a dyno out of an old automatic transmission and a bathroom scale if you wanted to. most "real dynos" measure torque, then calculate horsepower by multiplying it by RPM.

David

[Tman]

Torque is measured in INCH POUNDS, as in " It took 14 POUNDS of TORQUE to PRY my mornin wood down so I could piss.............my heels were 4 inches off the floor, so it takes 14 Pounds to gain 4 inches of Torque http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

[burndup]

Well, congrats on your apparatus still functioning, T, between you being an old fart and an avid cyclist, its living on borrowed time!






http://www.jalopyjournal.com/ubbthreads/images/graemlins/laugh.gif

[Flat Ernie]

OK all you backyard engineers - how does he get it up there on those truck tires? That's a mighty big gap & drop between the tire & the concrete pad...

Also, once running on speed, all four tires better be perfectly square with each other & perfectly flat at the contact patch because they will wander back & forth & then you'd have a nice mess. That would be my biggest concern...

Strain gauge? I thougth it was a quick disconnect! http://www.jalopyjournal.com/ubbthreads/images/graemlins/wink.gif

http://www.jalopyjournal.com/ubbthreads/images/graemlins/cool.gif

[burndup]

boards to get it onto the wheels... look at the tether, its triangulated against the frame, that eliminates the lateral motion...

But I still thing its bogus...

"You can fool some of the people some of the time..."

[JamesG]

Damn, I started this posted for a few laughs and it turns into a hell of a tech article. Way to go guys! http://www.jalopyjournal.com/ubbthreads/images/graemlins/cool.gif

[cornfieldrodder]

Apply the brakes on the "rollers". Use melal ramps, make them strong. After tethering the vehicle, release the dyno brake, put the car in gear and slooooowly squeeze the ramps out between the rollers and tires. Use reverse to reinstall.
There may be a way to anchor the ramps to the concrete slab.
Ya gotta think about saftey, ya know http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

[burndup]

expansion bolts yes... we covered all that.

[Smokin Joe]

Looks like it was wired by the same idgit that wired the last car I bought.

Give em credit folks. You can only go just so far on 3.2 beer. http://www.jalopyjournal.com/ubbthreads/images/graemlins/wink.gif

[stolenmojo]

this is a very scary version of a chassis dyno, we use them all the time on winston cup tractors but i don't see all the required pieces here. the strain gage there i worth about $500 and must be fed to at the very least a volt meter to read force, but that force doesn't matter in terms of HP. it really just a measure of how violent the test is.

correct application is as follows: typical chassis dyno uses 2 rollers of very high inertia and large diameter for maximum tire contact area. we know the inertia so all we have to do is measure the velocity of the rollers versus rpm of the motor and through the wonders of an invention called math we can figure torque. hp is merely another equation relating torque and speed. in this scenario - we'll say he can put down 300 hp (sissy) the inertia of that truck axle may be enough resistance to keep from spitting the valve train out. even better if he is running a well pump or a hydraulic motor off of the axle for additional resistance. now we run a car up through the gears into 4th w/ rear wheel speed around 140mph and do a full throttle pull to max rpm which puts rear wheel speed near 200mph and then clutch it. the dyno should have massive brakes to slow the rollers back down and do it all over, we sometimes leave it in gear and try to get backdrive hp back its not a very accurate test. we also heavily strap a car down because it will move around on the rollers. i can't imagine how much it would hop on inflated tires - our rollers are steel and about 6' in diameter.

can't fault the dude for trying though

[Flat Ernie]

[ QUOTE ]
look at the tether, its triangulated against the frame, that eliminates the lateral motion...

[/ QUOTE ]

No it won't - every tried pulling a tree stump with a truck or something? Better yet, a pull off between two trucks? The car will sway back & forth - the triangulated tether may help some, but if it's not perfectly square with each side exactly the same as the other, it will actually induce lateral motion & sway...

It's just plain stoopid http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

http://www.jalopyjournal.com/ubbthreads/images/graemlins/cool.gif

[wingnutz]

Just another candidate for a "Darwin Award"...! http://www.jalopyjournal.com/ubbthreads/images/graemlins/shocked.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

I liked the Post with the Gas tank strapped on a tractor wheel much better...! http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

Mark

[GreggAz]

so one low, where the hell did you find these pictures?

[four-thirteen]

i see all the required parts for a dyno. properly measured and calibrated, this thing COULD work just as well as any "real dyno". i'm not impressed by the construction, but i sure as hell am impressed by the ingenuity. hell, i'm even inspired. i wanna talk to this guy. David

[tredboy]

that 'triangulated tether' needs to be rigid, like a tow bar, not flexible like a chain, to work properly. it will still allow some side to side movement. i think if the chain is short enough, it would prevent the car from wandering all the way off the truck tires. in theory it would work, but the chain looks too long to be safe...



tred.

[Bugman]

If that contraption works, it'd be real easy to calibrate. Take 2 cars and have them dyno'd on a professional dyno. Then test them on this thing. Record the results and compare with the real dyno tests to come up with a conversion chart for the strain gauge. By using two different cars, you can graph the results and get a reasonably good approximation

[Bugman]

and he's probably got plywood or something to cover up the holes around the truck tires.

You can tell he's at least tried it because of the wear marks on the truck tires

[SamIyam]

Clem's Dyno Service & Excavatin'

We'll tell ya' how many stumps ya' can pull!

Sam.

[Flat Ernie]

...and someone rated this thread 5-stars?! http://www.jalopyjournal.com/ubbthreads/images/graemlins/confused.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/smirk.gif http://www.jalopyjournal.com/ubbthreads/images/graemlins/tongue.gif

http://www.jalopyjournal.com/ubbthreads/images/graemlins/cool.gif

[GreggAz]

why the secret, where did you find these?... I want to know more about this deal!

[metalshapes]

[ QUOTE ]
I want to know more about this deal!

[/ QUOTE ]

Me too...

[Chopped50Ford]

[ QUOTE ]
Where do you guys from Arkansas come up with this shit?

[/ QUOTE ]

LMAO!!!!

Maybe its the generator for the house...2 alternators on each wheel, wired in parallel to the fuse box????

[Chopped50Ford]

...