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Old 09-08-2007, 01:33 PM   #21
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HOLY CRAP... Thats sweet... I also didn't know these things were being made... Where is a good place to watch some Videos of these MONSTERS.
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Old 09-08-2007, 01:37 PM   #22
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http://www.youtube.com/results?search_query=rc+pullers
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Old 09-08-2007, 01:39 PM   #23
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Some older vids (just click on the pics): http://home.hetnet.nl/~cyril-wichers/video.htm
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Old 10-01-2007, 04:30 PM   #24
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Well, the first chips have been made!

Normally we use 1:8 scale buggy diffs, with a kind of planetary gear reduction in the rear wheels, but due to the low Rpm of this engine that's not an option. Running a buggy diff without the panetary gears on an engine like this is out of the question, so I needed a bigger diff.

I had a look at a 1:5 scale diff, but I thought that was just too big. Besides, I would have had to modify hat also, because these diffs use straight gears, instead of bevel gears.

So, in the end I decided to make my own diff.

The spider gears are aproximately the same size as those used in bigscale diffs (module 1), only I used 6 instead of 4 of them.
The crown and pignon gears are huge (module 2), with a reduction of 1:1.5.
The gears were bought and modified, everything else is scratch-built. When everything is finished, all the gears are going t be hardened.

Completed diff:


The diff next to a 1:8 scale Ofna diff.


Side cover removed:


Spider gears removed:

Last edited by Micropuller; 12-20-2007 at 05:58 PM.
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Old 10-01-2007, 04:39 PM   #25
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Freaking crazy!

Really can't wait to see it running!
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Old 10-01-2007, 04:47 PM   #26
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Its a mini boxer motor! You guys are completly insane with this stuff!
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Old 10-01-2007, 05:09 PM   #27
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http://www.youtube.com/watch?v=mutb7KgA9NM

V-12
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Old 10-01-2007, 07:10 PM   #28
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this is better


http://www.youtube.com/watch?v=aWIWxN06t10
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Old 10-01-2007, 08:11 PM   #29
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holy diff batman! can't wait to see this finished! i have now subscribed to this thread.
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Old 10-01-2007, 09:23 PM   #30
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no turning back now..........
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Old 10-03-2007, 02:48 PM   #31
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Quote:
Originally Posted by fishfever View Post
That engine just blew my mind.

All the other V8's and V12s were cool.....

But that 609.... Wow... just wow!

Makes me want to go back to school!



Any updates on your puller?

The engine you selected, what a Hoss...

The diff... Really nice man! I want one!


Isn't there going to be a limit on how much power a given size tire can deliver to the ground?

Do you plan on gearing it for some SERIOUS rpm, or slow and powerful?

Looking at your ring and pinion, I would say your going for insaneo wheel speed. Correct?

Also, will you be handing out safety glasses for all the dirt that is going to be flying?!!
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Old 10-03-2007, 03:10 PM   #32
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Quote:
Originally Posted by WheelChair View Post
Any updates on your puller?
Come on man, give me a break! Where do you think these parts come from, some kind of kit? Making that diff took me the best part of my weekend

Quote:
Originally Posted by WheelChair View Post
Isn't there going to be a limit on how much power a given size tire can deliver to the ground?
Yeah, our pullers get very hard to control once the wheelspeed exceeds 60MpH, due to the tires balooning.

Quote:
Originally Posted by WheelChair View Post
Do you plan on gearing it for some SERIOUS rpm, or slow and powerful?
Looking at your ring and pinion, I would say your going for insaneo wheel speed. Correct?
Total gear reduction (just the diff) is 1:1.5 Estimated max. RpM of the engine with this gearing (according to the engine manufacturer) will be 7000-7500, giving a wheelspeed of 90-95MpH
But seriously, gearing it any lower will probably cause the engine to overrev, something these big guys don't particularly like to do. I don't expect this puller to be a winner, because if I ever get it running well, it's going to be just rediculously overpowered. It's going to be more for show then go.

Quote:
Originally Posted by WheelChair View Post
Also, will you be handing out safety glasses for all the dirt that is going to be flying?!!
Nah, if they just stand to the side and keep their distance, everything will probably be Ok (I hope )

Last edited by Micropuller; 10-03-2007 at 04:21 PM.
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Old 10-03-2007, 07:20 PM   #33
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Quote:
Originally Posted by Micropuller View Post
Come on man, give me a break! Where do you think these parts come from, some kind of kit? Making that diff took me the best part of my weekend
Didn't mean to bust your balls man, that diff is sawheet!

...Guess I should have looked at the post date...

Lookin killer man
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Old 12-20-2007, 04:25 PM   #34
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Well, it's been a while, but finally here's an update on the project.

The first thing that had to be done was to fire up the engine, and see what we're dealing with.
So I started out with making a solid stand for it:


Clamp it down and hold on tight...


To say we weren't disappointed by the sound would be the understatement of the century. We were standing in a riding stable, and the next day the owner told me that the horses that were standing in another stable nearby started panicking when we started the engine!

So, let's continue with the rear-axle.
The first thing that had to be done was to make the pinion and drive axles and connect them to the gears. The pinion wasn't too hard to do, because the gear was big enough to simply screw it to a flange.


The drive axles were harder to connect, because the diff gears are a lot smaller. At first I thought of simply welding the axles to the gears, but in the end I decided to put a pin through the axles and mill a slot in the gears.


Then I made the axle-housing. The diff and the axles run on seperate ball bearings. On the outside the axles are held in place by a circlip, so they can't move in or out.




I made a couple of flanges to fit the drive axles. The rims will be mounted to these.




And this is what it looks like with the tires mounted:


Now that's finished, I can start on the hardest part of this project, the clutch.
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Old 12-20-2007, 06:04 PM   #35
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pure and simple, its a work of art!!
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Old 12-20-2007, 07:30 PM   #36
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Super nice work mang!
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Old 12-20-2007, 08:28 PM   #37
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These things are bad a** !
A guy down the road from me has a clod based puller , with 40lbs of ballast on the front . constantly breaks things . I thought his was cool , but this ... can't wait to see it in action
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Old 12-20-2007, 09:00 PM   #38
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Quote:
Originally Posted by Usmc8541 View Post
Im a power hungry SOB, Id run it off of 30% Nitro. I did it to my weedeater when I was a kid, worked great. I could cut down some pretty thick shrubbery.
We did that to my buddies go ped when they first came out and it wouldn't shut off.
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Old 12-20-2007, 09:01 PM   #39
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You're crazy.
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Old 12-21-2007, 03:35 PM   #40
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Quote:
Originally Posted by ColquittCustom405 View Post
You're crazy.
Don't know if that was directed at me, but if it was, I'll take that as a compliment!

Last edited by Micropuller; 12-21-2007 at 03:37 PM.
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