Announcement

**bszopi** · 10-16-2007, 04:12 PM

Nobody ever said the wheels/tires would stay the same...

Its currently on hold, as I got ahold of the manufacturer today and get 2 new gearboxes on the way here. Set me back $35+shipping, so it wasn't too bad.

And as far as me sitting in it, why do you think it broke to begin with?!? We live in a very hilly area, so there are times when my 5yr old doesn't want to drive down the hills herself. And see will absolutely not drive down our driveway in it. Get this thing going 5mph+ downhill and then let off the gas, and even the plastic wheels want to keep spinning even though the electric motors are locked down. Once the new gearboxes go in, I probably won't be riding/driving as much as I did before.

BUT, the gas engine project is not dead. I still have another daughter who is my little race car driver. If anything, I will just build a go-kart and slap the plastic body on top of it.

**sprucegagt** · 10-16-2007, 05:04 PM

Originally posted by bszopi View Post

I think I've seen some videos of that engine Andy. Guy just has tooo much time on his hands!

I'm still thinking on what I could do. If I have to add some metal supports, I can do that as well to stiffen up the body some. And I have to find something that will fit easily in the space that I have (ie, the trunk area). If I start messing with it more (winter is coming around), I keep everyone posted.

It gets better. The guy now has a miniture jet turbine and will also make a 1/3 scale top fuel hemi! The hemi may be made in volume so people can buy one.

http://www.weberprecision.com/

**Superdave** · 10-16-2007, 05:10 PM

Originally posted by SappySE107 View Post

12hp out of a raptor (5hp) must have been an open or IKA motor. WKA motors don't allow any real port work or larger carb. The OHV 1 cylinder motors can be wicked in the open class though.

I was good friends with some guys that ran a go cart performance shop (and lawn mower repair on the side) i spent a summer working for them and built the engine in their shop. Pretty much modeled it after one of their setups but added in the port work. Got great deals on stuff since they pretty much had a briggs graveyard in the back.

**walterdude** · 10-16-2007, 09:25 PM

Amazing 1:3 Scale Replica Ferrari 312PB

http://geek.videosift.com/video/Amazing-13-Scale-Replica-Ferrari-312PB

Jeremy Clarkson (in 1998) interviewing a modern-day Da Vinci - "There are few if any models in the world to rival the Ferrari 312PB built by Pierre Scerri of Avignon, France. This 1:3 scale marvel is the real thing in every sense, from its operating 12-cylinder engine to the exact scale operating Ferrari gauges which are calibrated precisely to indicate rpm, oil pressure, water temperature and oil temperature. It took Pierre 15 years and more than 20,000 hours to build this car. He learned to make glass so he could make the exact pattern lens for the operating headlights. He learned to make rubber so he could mold his own tires. His computer mainframe design background with the French telecommunications system allowed him to duplicate the Ferrari electronics system in exact miniature. It also provided him with the understanding needed to make a 1/3 scale operating fuel injection system identical to that in the full-size Ferrari. Perhaps the toughest aspect of the car was the gearbox, for which Ferrari supplied drawings. While Pierre had an understanding of the object to be built, he lacked the very expensive specialized equipment required to build high-tolerance gears and synchros. Colleti, the builder of the full-size car's gearbox ended up building the model's gearbox. There is no sign of deviation from the real car in terms of replication. The spark plugs are miniatures, the radiators were hand-built to the exact same core design as the real ones. Even the water reservoir fill cap is a Fiat radiator cap made exactly the same way as the real one and pressure tested. The suspension is exact and the hydraulically controlled brakes from the brake pedal have quick-change brake pads just as on the real car. If you were 1:3 scale, you would open the door of the car, get in, fasten your seat belt as on the full-size car, take you Ferrari key (engraved identically to the real key) and put it into the ignition. You would flip the toggle switch for the fuel pumps, and with this you would hear the fuel-injection system come to life, powered by a real scale battery built by Pierre. A crew member would stick the hand-held scale starter into the rear transaxle housing and as the engine turned over you would flip the ignition toggle switch and the 12-cylinder engine would come to life with a sound you'd never forget. (Thanks to a YouTube description) Pierre Scerri's website: http://mps-sportproto.com/en/index.php

http://mps-sportproto.com/en/index.php

mot1, mot2

Those little V8s are pretty cool,,, BUT,,, check this out!! This guy built a complete 1:3 scale Ferrari 312PB Race Car with a working 5 speed gearbox with reverse.... It's an absolutely perfect scale model,,, a WORKING model, as in EVERYTHING is functional... If you happen to know of a 1:3 scale person he could drive it!!! Wonder how big Brad's kid is????
I'm fasinated by things like this.. It's not too terribly different than the stuff I was doing as an experimental machinist in precision hydraulics... Back in the days when I had all of my extremities....
Hope someone can appreciate this!!!
Tom

**SappySE107** · 10-16-2007, 09:27 PM

The machine shop I go to does the racing briggs motors as well:P I bought an attachment for my flowbench to flow them, but haven't made the new flowbench yet. I can't afford to get into go kart racing but I like making things faster.

**sharkey** · 10-19-2007, 02:49 AM

Originally posted by Superdave View Post

I was good friends with some guys that ran a go cart performance shop (and lawn mower repair on the side) i spent a summer working for them and built the engine in their shop. Pretty much modeled it after one of their setups but added in the port work. Got great deals on stuff since they pretty much had a briggs graveyard in the back.

i was into jr dragsters years ago. i did build a pretty wicked motor. we were limited to a briggs 5hp block and ignition, no boost/juice. sleeved the block, .120" overbore, stroker crank, billet rod and piston, larger valves, porting, epoxy work, different head, mikuni carb. was a wicked little motor. however this was nothing, some guys were spending $5000 on a crate motor, they did make 40+hp.

in later years when we were all to old for this stuff, one guy built a mini bike with an alcohol briggs motor from all his spare parts. figure about 20hp, the thing was scarry fast.

**El_Diablo** · 10-20-2007, 12:01 AM

only $500? you should see the prices now....

**sharkey** · 10-20-2007, 01:28 AM

dam key board, i meant to say $5000. my 0 key likes to not work now and then

**El_Diablo** · 10-20-2007, 02:05 AM

lol, i was bout to say...

for $5k i would much rather build a modified junior with a motorcycle engine and a turbo to actually get some speed out of it... but hell, if i was goin that far i would wanna go all out and make it street legal just to screw around, lol

**sharkey** · 10-20-2007, 05:25 PM

unfortunetly limmiting the jr dragsters to a 5hp brioggs block was the worst thing they could have done to keep costs down. if they had allowed twin cylender briggs motors, the cost wouldnt have gotten out of hand.

**geoffinbc** · 10-21-2007, 02:38 AM

Man that gearbox got thrashed. I wander what the torque rating is? Must be inch pounds. LOL

**Superdave** · 10-21-2007, 03:41 PM

Originally posted by sharkey View Post

unfortunetly limmiting the jr dragsters to a 5hp brioggs block was the worst thing they could have done to keep costs down. if they had allowed twin cylender briggs motors, the cost wouldnt have gotten out of hand.

At the time i had a 2cyl briggs i was working on, i forget the stock HP but it came off of some kind of industrial pump trailer and it was f'n heavy...

I put a bit of work into it, nothing drastic.. it ran like a raped ape in my buddies mini-bike though!

I always wanted to boost one, never got the chance.

**sharkey** · 10-21-2007, 05:34 PM

years ago we were playing around with a supercharger on a 5hp briggs. we found a ton of roots style meters used for metering natural gas at the hydro plants. and to top it off, they had full stripping and were a helix rotor design. the one guy was a machinist, so he built adaptyed these to the block (we had several sizes of blowers). we ran a top alcohol dragster at the time, so as far as the fuel system, we built a full mechanical alcohol injection system, with custom "throttle body", barrel valve and fuel pump. the motor itself was built with 9:1 compression .120" over piston, billet rod, custom blower cam, ported, custom machined dual spark plug head, mallory ignition system.

it ran a max of 30psi boost, 90psi fuel pressure, and maxed out the 50hp small engine dyno we had it mounted on. never had any failures with it, it only made it into a car once to screw around with for a bit. it was freaking fast. of coarse never made it down the track, we knew nhra officials had no sence of humor and would never allow it to run.

Announcement

My new project and other misc pics

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