Author Topic: Madness  (Read 241 times)

ajaffa1

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Madness
« on: January 30, 2019, 02:14:18 AM »
I`ve got to get me one of these: https://www.youtube.com/watch?v=qzVBpddpK2k

Bob

glort

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Re: Madness
« Reply #1 on: January 30, 2019, 04:41:10 AM »

There is an old grey fergy at the local engine club that has a 302 Ford V8 in it. The plate to couple the engine and rest of the tractor together is about 2" think and the guy that built it says was far and away the hardest and most expensive bit to fabricate which I have no doubt of.

If I can find a gearbox, I want to do a tractor myself. Just use all Subaru Running gear only cut the half shafts down to make it a bit narrower and shorten the tail shaft. Even using car Tyres, with 4WD it would have decent grip and pulling power especially  when I filled the tyres. .  I want to use a 6 or 12 HP Diesel with a high reduction gear and Centrifugal clutch.
For a small  tractor would be strong as heck and do everything I would want.

ajaffa1

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Re: Madness
« Reply #2 on: January 30, 2019, 08:59:31 AM »
Sounds like a fine project. Keep the gearing right, you don`t want a machine like the one in the video, I wonder what the speed rating is on a lawn mower tyre. I`m guessing they would probably start to de-laminate at around 25 MPH and I`m sure this guy was going far faster than that. Perhaps they sell speed rated mower tyres in the US. Wonder if the guy had upgraded the brakes, how long do you think the gearbox would last under that much torque.

Bob
















 

glort

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Re: Madness
« Reply #3 on: January 30, 2019, 09:40:54 AM »

The thing I would be most worried about would be the stability at speed.
Tractors tend to have a narrow track, NO suspension and less than precise steering. Any bumps in the road could easily launch the thing or at very least put you way off course and off the road or into a tree.

The brakes would be another issue. Most tractors only have the brakes on the rear which is fine for stopping an implement  when doing 10 MPH or holding it on a hill but at speed the tendency would be to lock up before a lot of braking was accomplished.
The other thing would be Cooling. Most tractors have big drum brakes but not a lot of thought is paid to cooling the things particularly the shoes.

The gearbox on that thing was clearly an auto so I assume it was from a car.  I don't know of any tractor that size and logical age that would have an auto in it. I can't imagine they would ever sell one to farmers if they did. My father still gets people coming into him raving on about how Automatics are nothing but trouble, use too much fuel, are unreliable and they would never own one.  Dad laughs and has test report from a magazine he keeps for such people that show the current 7/8 speed autos get better mileage with the same car in manual and then shows them the pile of automatic transmissions he can't sell because they never go wrong so no one ever needs them then the 1-2 Manuals he may have and the waiting list he keeps for people wanting them.

I have been looking at some vehicles on YT that use small 6Hp stationary engines and they have about a 10:1 reduction, sometimes much more off the engine to a sproket welded to the input shaft of the gearbox. They don't move fast but they are unstoppable. Like that little plough I have.  I have never taken the engine over a fast idle yet but it is the same. Something gives but it never stops.  The thing will break the 12MM bolts easily holding the tines on the plough part on treeroots but the  the thing never actually stops or does more than load the engine up a bit.  I have learned a lot about what can be done with low power and big gear reduction with this thing.

Ideally I'd like to get a Dual range Suby gearbox. They had an extra low gear built in.  Wife had a little Imprezza with a low range box and that would pull my big 4WD along the concrete with the rear wheels locked when my son forgot to let off the hand brake and I didn't even realise it.  Felt the load but it moved it as I expected it would rolling!

I Do have my eye on a little 4Wd tractor with a cutting deck on fleabay but the guy wants more than I  ( or so far anyone else ) think its worth and isn't budging.  I'll keep an eye on it and see how I go.
Would be good to have something with a PTO and a 3 point linkage.

LowGear

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Re: Madness
« Reply #4 on: January 31, 2019, 05:52:31 PM »
I'm sane!  I'm sane!  I'm sane!  I'm sane!

I now have proof.

I wonder if can stop in the quarter mile?
NPR Tipper/Dump Truck
Kubota BX 2230
Witte BD Generator
SunnyBoy 6000 + SolarWorld 245

AdeV

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Re: Madness
« Reply #5 on: February 02, 2019, 08:11:00 AM »
Good grief!

It looks, and sounds, amazing.... but you have to be several shades of daft to go out on it without a full crash hat and leather motorcycle gear! And I'm not sure I'd want to ride it even then...
Cheers!
Ade.
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0x Lister JP4 :( - Sold to go in a canal boat.

ajaffa1

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Re: Madness
« Reply #6 on: February 02, 2019, 08:34:05 AM »
Hi Ade, I think a person would need to be plumb crazy to even think of fitting an engine that size in a lawn mower. Do you think someone that insane cares about health and safety equipment? Eventually the laws governing survival of the fittest will catch up with him, I just don`t want to have to watch it!

Bob

mike90045

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Re: Madness
« Reply #7 on: February 02, 2019, 10:21:40 PM »
Some insane RPM's for the axle bearings - when they let loose, it might slow it some, or just perform cartwheels.

BruceM

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Re: Madness
« Reply #8 on: February 02, 2019, 10:45:37 PM »
Nothing about that yard tractor was designed for high speed use...tires, suspension, breaking, drivetrain, bearings, front end handling, etc.  It's a fun test to see which lets go first, watching from safe distance and being unrelated to the future asphalt hamburger.


glort

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Re: Madness
« Reply #9 on: February 02, 2019, 11:04:12 PM »

Home grown Fast AND very practical Mower:

https://www.youtube.com/watch?v=M8VJLtk1Sao

There is a number of vids on the build.  Pretty much done for the ground up with the intended use and performance in mind. Big difference to just bolting in a whopping great engine into an otherwise standard tractor.

BruceM

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Re: Madness
« Reply #10 on: February 02, 2019, 11:45:21 PM »
That guy is a brilliant designer. His trailer is very well done, loaded with good features.

AdeV

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Re: Madness
« Reply #11 on: February 03, 2019, 01:55:00 PM »
Brilliant mower!

If you've got about half a day to spare (literally!), the Project Binky set is well worth a watch - fabrication taken to the "n"th degree - and beyond!

That playlist doesn't have the very latest episode in it yet, I'm sure that'll be corrected soon. There's also a couple of "Howie did it" add-on videos showing some of the amazing work they do with a knackered little Myford lathe, and a tiny Taig CNC milling machine.
Cheers!
Ade.
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1x Lister CS Start-o-Matic (complete, runs)
0x Lister JP4 :( - Sold to go in a canal boat.

BruceM

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Re: Madness
« Reply #12 on: February 03, 2019, 06:09:05 PM »
Binky- I've lost a couple hours already.  Great project, amazing fabrication skills.
Thanks Ade.