I started off looking at a forum for R/C cars and saw this project go underway, it surely has amazed me at this man's talent and ability to figure all of it out, keep in mind he has made almost every peice of this truck except motor/electrical/front a-arms/ rear straight axle. I believe he said he only used a mill to do the work, and a LOT of aluminum, and some carbon fiber.













He isn't done yet... but oh my... That thing looks AWESOME!!!

that suspension is knarly ....

Very cool indeed! Nice work. Looks like the ride height is nice and low, did he say if it has much droop? Looks like it probably has a decent amount.

I'm impressed! I like it!

I used to run similar 4 stroke motors in my airplanes.. Sweet for sure. Those motors have cams with push rods and rocker arms etc.. Tons of torque and real quiet.

That blows me away, Wish I had the know how

that fricken trick that guys got some talant

Wow thats nice wish i could build a truck like that, that things gonna haul.

Do you have a link to that thread / forum? I would like to be able to follow the progress on that thing.

dude has alot of free time on his hands, that is a really bitchen looking truck, wonder what the finish cost will be?

nice weight distribution on the front and rear. That thing looks sick!

How does the dual motor work? one runs the front and one for that back? i'm confused on that.

I like the carbon fiber on the rear, looks very clean........i like the simple look, i hate having 30 wires all over........too hard to clean.

One problem will be his stock plastic front Arms...........upgrade!, They make aluminums use them.

I found the truck at Maxxtraxx.. or www.maxxtraxx.com you have to sign up, they have many cool projects. It is under "User Projects and Creations" and the post is called "1/8 4-stroke Baja truck project"

I was thinking he could of made his own a-arms too but im not sure why he didn't.. the idea of the two for strokes is they mount up to a clutch type mechanism which is two speed.. here's a picture..

err.. sorry for not answering your question though, the motors are both hooked up to those two gears which then lead to differentials on the front/rear, if he wanted to he could have it 4wd but I dont see drive shafts on the front differential so? Not sure.

he should have ran two drive shafts and went 4x4 i know i like having it on my T-maxx.

I see a lot of stuff i like on that baja.........but some stuff i'm not to sure on. Why did he use pull starts vs electric? much easier.

he didn't go electric for two reasons.. hard as HELL to start those things without pull start (which is rather easy) and because it would add more weight than it already is, also you find a way to start those two motors electrically... a bump start wouldn't work because they can't turn over those beasts.

He did run all of the shafts.. which I JUST saw.. look here at the front end.

dam, that is awsome

That thing is sick, if i had the talent and patience i would make one but i dont have any talent to do that, well maybe a little but im sure if i tried nothing would work, i was at a hooby shop a long time ago and they had engines out for the airplanes and they had a v-twin one it was cool , i want to see this thing run

wow!! that thing is freakin cool!

I'm just curious how that connection between the motors works. I mean I know tractor pullers have run multi-engine setups for years so it can't be that complex...but I've also ridden on a tandem bicycle and know how easily two power sources can fight against each other if things aren't running in synch.

Can anyone give a good explanation of how that kind of setup works?

i dont have a GOOD explanantion but i'll give it a go..

Both motors have a clutch on them, which goes to the pinion (the small thing with teeth) and then to the main spur. If there is any "fight" inbetween the motors this clutches will just slip to allow the power stay equal between motors.

Which is also why if you slam the gas down on these little things, if you have the clutches, or spurs.. too loose it will just slipp.. and the motor power wont even go to the wheels.

Horsepower is additive... At the same rpm, they just use the + sign.

TV Tommy Ivo proved that many moons ago... (And others)

eh........if it works it works.

I really like the front end on that car! .........you could run it into a wall and it wouldn't phase it. I'm jealous.........i want one now. I'm definately thinking he should go with the aluminum arms. atleast the lowers if not anything. $30 a pair.

Yes, I see the different RPM idea. A sprag would help. Like an over-run clutch. On both engines. A one-way device so either can be overun by the other if it lags behind.

Wow! You could have a low RPM torque monster AND a high RPM HP engine. On the same chassis!

Carl

I was looking at the engine setup too and wondered how difficult it would be to get thosthings in sync. I have never seen a carb sync that small. I would think that he might want to fabricate a custom intake manifold that would run both carbs on the same intake that would go to both motors. He could even go as far as a merged exhaust. I would think that this would allow the motors to run more evenly, and then a "solid" connection between the two would be possible, if efect creating a multi-cylinder motor. He would probally want to phase the compression and ignition strokes too.

If this was my project, this is what I would do.

but it's not your project..................... just kiddin

i think that's a good idea with merging the exhaust, not like it's going to make it sound that much better...........but it would sure look a lot better! that's gonna be one bad-a$$ little truck!

He should of got an actuall v-twin engine, i have seen v-twin airplanes engines in the hobby shops and they are sick, that way it would be alot easier to get everything running perfect, oh and the exhaust is weird it looks like its plastic

ok think of it like this....u can run that car with only one motor, because if the crank isnt turning its not gonna turn the gear...but i think maybe if the one motor spins the other motor which is running fast enough to make the clutch engage, it might turn it over. but it wont turn over unless u have a glow starter. its like pushing a car with a manual tranny, say someone is pushing the car and u hold the clutch in, the cars not going to start unless u let out that clutch. so if one motor is running faster then the other, the other motor prolly wont even be turning the spur by itself the other motor will be making the gear spin too fast to grab.....
there i tried. prolly wont make sence but it does to me lol

by the way ive seen a truck with 3 motors

The idea of dual motors or more (up to five in truck pulls) is very well tried in the rc world. And it does work, because one of the trucks that was built dual engines was tested on a dyno, and while it didn't get double the horsepower, it was a very good juimp.

From what I understand, if you have a bunch of engines and they are all contected with a solid conection, then they act as one. My dad, who maintains equipment in the Long Beach harbor, crains, transtainers, etc. and is a professional diesel mechanic says that a lot of the equipment has at least two diesel engines that are lined up, but run off the same fuel rail and exhaust system. This makes one big effin engine.

Also, for those who have run VW engines with dual carbs basically have two different engines that are connected. You know how crappy the thing will run if the carbs are out of sync.

Talented man for sure!!

It is cool but I wouldn't spend that much time and money on something I couldn't ride in.
LATER DON~~~

That truck is awsome....Ive been thinking of making a sand rail r/c car with a aluminium tube chassis, radiator, v-twin engine, ect. Looks like a lot of money.

I started making a static model of a sandrail out of metal coat hangers a few years ago....then I got a bunch of motors from Fantom in exchange for doing some work for them on their website and decided I needed to do something powered instead. Abandoned the coat hanger model but never got going on the powered version

Whoa! Here I'm doing a search for some old pix thru google, and I find my li'll old toy being discussed! Needless to say I'm honored that you guys who play with the "real thang" find my li'll toy interesting

Thank you all so much for the kind words, and if there is any interest I'd be happy to post updates (not there have been a lot of them lately, hate it when work gets in the way of my hobbies )

Thor

well don't leave just yet. do you still have it?

Yes sir, still working on it actually. My progress on it has been pathetic, thanks to work, so its been more or less un-touched for the last 4 months. Then again I'm sorta neck-deep in snow this time of year, so I guess I still have some tinker-time left

Only really "biggies" I need to figure out are rear shocks and some swaybars. Springs for the shocks are the really PITA, having a real hard time finding something that small thats stiff enough (yes, its a chunky li'll thing...hehe)

Thor

hey man, you simply have to finish that thing. It's bad arse.

That is awesome, but man I would never have the patience to mill that stuff. Maybe if I could aftermarket buy the parts I could finish it, but doubt that. Oops there goes the ADHD kicking in gotta go.

kinda funny when you find something like that huh?

We are all amazed by your little truggy, very nice work...some of us can build "the real thing" but are still facsinated with smaller remote control versions.

Wow, thanks guys! I do intend to finish it, my take is always "it'll be done when its done", I try not to get stressed out over hobbies

The milling does take some time since its all manual (no CNC), but I think I have some sort of flying-metal-chips fetish, so thats all OK

I am however amazed and humbled by your 1:1 rigs, good lord I'd trade hobbies in a heartbeat with ya'll! Rest assured that I'll be plowing thru these forums looking for tid-bits that might work on my toy.

I never intended to make a "scale" TT rig, all I wanted was something that might handle like one, with 4x4 drive, solid rear and IFS front suspension and 4-stroke power. And the funny thing is that the functionality kinda drove it towards something that sorta looks like a TT rig...sorta

Just a few quick comments on the powerplant questions; the reason I went with a pair of 4-strokes instead of a twin is that there are no car/truck twins, only aircraft twins, and since they don't have the right revs/powerband for a truck I figured gearing would be a PITA. That, and the fact that it wuld cost 4-5 times more...LOL.

Each engine shaft is drives a centrifugal clutch, which in turn drives a central 2-speed tranny, so synch is not a real issue; if one lags the clutch releases and gets a "free ride" so to speak.

I'll try to shoot a few snaps and show the truck as it is now.

Thor

hey Thor



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(post more details please )

thorbob that truck rocks