Original Year
# of pieces
Cars and Trucks: Go Carts
Steering, 1 Cylinder Engine
Other Views

8842 Go Cart

iso revolve
Click the image to download the LDraw file of this model.
Model by Iņigo Lazcanotegui

Set 8842 was released in 1986 and was already the 3rd go cart released by LEGOŪ.  This go cart features  steering using a rack and pinion system, a single cylinder reciprocating engine driven from one rear wheel, and dual wheels on each corner.

Unless the engine is very heavy, this go cart would not be balanced very well since the engine is mounted next to the driver resulting in the driver sitting off center.  On the other hand, if this engine is to scale, the single cylinder could easily displace 9.4 liters, making this a very fast go cart indeed!  (assuming a bore and stroke of 9 inches)

This go cart did not really break any new ground for Technic except for the mounting of the engine at an unusual angle.  This arrangement makes it much easier to see the function of the piston as it reciprocates.  There are a large number (22) of toothed connectors which are used to form a cage around the body as well as a front bumper.


The front wheels can be steered using a wheel at the driver's position.  The wheel drives an axle connected to a 16 tooth pinion gear.  The pinion drives a rack.  The steering mechanism itself uses control arms and toothed links.

Note that the steering wheel is not centered in the vehicle, but neither is it centered on the driver's seat which is offset to the left to make room for the engine.

Click for an animation of the steering in motion.
The single cylinder engine uses the offset axle hole of a 24 tooth gear to make a crankshaft.  Connectors placed end to end and clocked 90 degrees form a rod which connects to a specialized 2x2 square piston.  The "cylinder" is actually square.

The engine is driven off of a set of 16 tooth gears attached to the left rear wheel, giving the engine a ratio 1:1 with respect to the wheels.

The engine also has an exhaust pipe and muffler simulated on the back, as well as cooling fins on the block.
engine    engine
Click for an animation of the engine in motion.
Wheels and Tires
This set has 8 of the 13x24 Model Team wheels and tires, and is the first Technic model to use them.

Other Views

Side View
side view
Top View
top view
Back View
back view
Front View
front view
Computer Render

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