Speed question

[J-Mech]

Originally Posted by CADplans

When you find out the horsepower needed to go 30MPH, you will be looking at a different engine.

My Polaris ATV, which weighs half or less of the weight of a Cub Cadet, and has 22 horsepower, struggles to get over 35MPH.

Even tire pressure will need to be changed.

Increasing RPM significantly increases HP. But your correct in that he will quickly find out he needs more than a 12hp. When he figures out what gear sets cost, and how many dollars it takes to build up a motor capable of 6000+ RPM, I think he will abandon ship.

[cooperino]

Had to look in OP's profile to see he has a 127. If it runs and works seems like you have a decent worker with the attachments you have. If it is in running condition I would not mess with it.

If you want to make a "screamer" Out of a IH Cub I would suggest one with the largest engine available to start with.. 82 series, something with a twin. As we say in Pro stocks, theres no substitute for cubic inches.

I personally am not familiar with what it takes cost wise to run one of these engine at higher RPM's than what they were intended to be but I can imagine its relative to any engine you want to build for high RPM use..$$$$$

The trans and rears in them are not what your looking for to go fast. I would think that this is where the work comes in for guys with fast tractors.

They most likely replace the rear completely.

Where in NY are you? Is there a group local that race tractors? Talk to guys already doing this to get your answers.

[J-Mech]

There are no mods for the H opposed twin engines from the 82 series. Not many, or good ones. You would have to go to the CH motor. Now you're talking big dollars.

Definitely have to use a gear drive. No good way to get more speed from a hydro, plus running one that fast is likely going to grenade it.

Then there's the driveline. Has to be modified to run above 4000 RPM.

That's just a tiny bit of info....

[cooperino]

I have never thought about racing tractors before today. Had no idea how many different "classes" of tractor racing there really is..

Seems to be a lot of "puller" types built from older IH Cubs.

The Circle track, on grass, sort of drifting style seems to use late model trans axle type tractors but I see many of them rip that out and opt for a live axle like a go cart.

Then theres a bunch of different types of drag racing tractors. Nothin stock at all with these guys.

I did not see a single "modified stock setup" IH Cub doing 35 MPH.

The ones that did go that fast and faster had motorcycle engines in them and certainly had different axles, trans, etc.

Interesting stuff to watch... but ill just keep cutting grass and working in the yard with my cubs

[J-Mech]

Originally Posted by cooperino

I did not see a single "modified stock setup" IH Cub doing 35 MPH.

That's because IH tractors owners are smarter than that. They hook them to a sled if they want to play with them.

[cooperino]

Originally Posted by J-Mech

That's because IH tractors owners are smarter than that. They hook them to a sled if they want to play with them.

Well, for once we agree on something.

[Marko141]

I'm not cutting up my 127. I will look for a cub after I decide what rear end and what mods I can get. Again I'm looking for the possiblity of gear ratio changes and wanting to know if the rear ends will hold up with a 23hp v-twin vanguard engine, that's built.
Rev kit, billet push rods, larger cam, the cart killer cam from EC card, port and polished heads and shave them. Plan to be up in the 35hp range that will run 5-6k rpm shooting up to 7-8k. I have this exact engine in my garage right now. I have plenty of knowledge with the engines, I lack the knowledge for the cub cadet rear ends. If anyone wants to be a smart a$$, move past the post, thanks but no thanks, not hear, not now, not ever. Anything iinsulting will result in me blocking them and I won't have to worry about it anymore. Anyone who wants to actually help and provide advice to answer the questions it would be appreciated.

[CADplans]

At the very front of the Cub Cadet manual 3 speed transmission is a gear reduction.

To go 35MPH, simply drive the transmission without the reduction, you will get 35MPH, with the engine purring at 3,600 RPM.

If you want to rev the engine higher, shift down to 2nd gear,,,

1st gear will be nice for putting around the yard,,,

A Farmall Cub transmission is identical, without the reduction.
Put that transmission in the Cub Cadet, you are ready to go.

You will need a stout clutch!!

[jbrewer]

You might GO 35 MPH, but you'll still have sketchy brakes and steering that is absolutely unstable at that speed.

Why wreck a tractor?

[cooperino]

You can block people here??? Wheres that button at? Not being a smart a$$ LOL. I really am asking if there is an option like that.