[Dan] wanted to learn a bit about solid state ignition in engines; to get started he needed a test subject, so he decided he would upgrade his old 12 horsepower lawnmower.

Originally the lawnmower engine used a magneto coil ignition system, magnetos are simple and very common in lawnmowers. The magneto is designed to produce a high voltage spike when influenced by a magnetic field. A magnet is attached to the engine’s crankshaft to time the voltage spikes, these spikes are fed directly into the spark plugs to cause ignition, this is why you don’t need a battery. [Dan] explains how the solid state ignition works on his site as he goes through the build details. Essentially it uses a hall effect sensor to detect a spinning magnet on the crankshaft for timing, and a transistor and battery to fire the spark plugs for ignition.

Once he got his circuit up and running on a breadboard, he fitted the entire system into a neat plastic box and fixed it to the front of the lawnmower, as if it was meant to be there all along.

Although a V-12 engine is always nice, cramming one into a motorcycle definitely qualifies as an engine hack! [Allen Millyard], wasn’t satisfied with the standard number of cylinders (6!) on his already gigantic Kawasaki KZ1300. Like any reasonable person, he decided to graft two of their powerplants together!

In true engine hacker form, inspiration struck at a classic bikes show when someone said “Suppose you’re going to make a V-12 next, then?” [Allen] replied that it would be impossible, but after this conversation, he reportedly had to build one. By the time the show ended he’d figured out how to do it. Lots of work and two six-cylinder engines later, [Allen] had proven this task to be possible.

Although this may seem like a very extreme motorcycle engine hack, [Allen] has done quite a few motorcycle engine mods, making v-twins out of a pair of single-cylinder engines and a V-eight from two four-cylinder engines. Check out the video of his latest beast after the break!

This hack seems simple enough:

1. 1. Open hatchback
2. 2. Insert jet engine
3. 3. Profit

Actually, the guy who added a jet engine to a VW Beetle has a PhD in Mechanical Engineering from Stanford. He claims this is street legal, and even has a snapshot of the police trying to figure out what to charge him with after stopping him on the road. There’s plenty of details and we’re not questioning [Ron Patrick's] competence, but having the intake for the turbine inside the cab of the vehicle seems a bit insane. He remarks that “it’s a little windy but not unbearable”… yeah.

One the same page you’ll find his dual-jet modified scooter. The starting cost there is considerably less, especially if you build your own ram jets.

[Thanks Goldscott]

Satisfy your need to view some quality machining by looking through this Stirling engine worklog. We’ve seen these engines used a few other times in creating electricity from solar energy, powering a car, and even built from aluminum cans. [David Morrow] built this rendition to push the limits of his machining skills. We’d say he succeeded. The finished piece should run with the help of a heat source such as a candle. There’s no video of this engine, but we’ve embedded a clip of a similar device after the break in order to give you an idea of how this would work.

[Thanks The Ideanator]

The EVIC is a computer controlled internal combustion engine, utilizing a cam less solenoid actuated valve system. In addition to intake and exhaust valve control, the processor also handles ignition timing. With dynamic valve timing, it is possible to make an engine more efficient. Where a classic combustion engine would wastefully burn fuel, the EVIC can skip power cycles which are not needed. By increasing the valve duration, the CPU enables easy starting. The latest is the EVIC Mk3 which adds an exhaust valve sensor, and 3:1 solenoid leverage. There is a photo gallery with several EVIC engines. The Mk2 Twin is demonstrated in the video embedded below.

[Steven Laurie] is a native of Whitby, Ontario, where a local art gallery called the Station Gallery is exhibiting his motor-powered artwork. There [Laurie] demonstrated his Posi-Track Burnout Machine, which looks something like a souped-up lawnmower sitting on top of a car axle. Instead of being pushed along the grass, though, the burnout machine revs against the pavement creating skid marks on the asphalt as it pulls forward against the grip of the driver.

Another of Laurie’s machines, the Handheld Rubber Burner, does much the same thing as the Burnout Machine, except instead of making long skid marks, it is intended to create user-designed skid marks. This custom machine is small enough to be held and directed using two hands. He also designed a similar device called the Stationary Rubber Burner (also called the Donut Machine) with the same purpose in mind, but it can only create circular skid marks since it pivots around center post. All three machines create skid marks, but the true art is in the performance, with the tires squealing, the engine revving, and the smell and the smoke of burning rubber fill the air.

For the pure visceral sensation of revving engine sounds, Laurie created the Boom Tube. It is a lawnmower engine mounted on a stand with an exhaust tube jutting upward. It does nothing more than idle and create a distinctive sound.

A slightly more interactive take on the concept is his Stationary Revving Machine. It is little more than an engine with a gas pedal, but like his other creations, it is intended to evoke the sounds and smells associated with muscle cars.

Laurie is nothing if not thorough, as evidenced by a smaller revving machine he named Wild Thing. It’s just a chainsaw with a large exhaust tip and no cutting ability.

Two other machines, the Ape Hanger Rumbler and the Grass Ripping/Grave Diggin’ Machine are also part of the exhibit. Even though we know you like machines that do practical things, we recommend that you contemplate your gear lust at this exhibit if you’re in the Ontario area. If not, check out [Steven Laurie]‘s Flickr stream.