Tuesday, February 17, 2009

New Inline 3 and V8 motors, at LPE Power

Alex Zorko (nicjasno.com) and Ivan (idic.at) have released their new LPE motors at LPEpower.

Finally they are selling a V8 configuration, after adding 1 month ago, the 2nd version of their Inline 3 LPE.

Pneumatic SYS inline 3 cylinder engine
The new 3 cylinder engine (SYS I3) is more powerful, smaller and lighter than its 3 cylinder predecessor.
Even it outperformed a V8 version back from 2005, which powered Alex's Ford Mustang at the time.

The new SYS I3 main features are:
  • The new crankshaft concept in combination with the Scotch Yoke principle of operation. The first and last crank pieces are constructed from 36 toothed bevel gears and are interconnected with a very rigid longitudinal shaft that prevents the crankshaft from twisting, which in terms greatly improves the torque output.
  • The new camless valvetrain. Sliding yokes directly move the valve rockers - there are no shafts, cams or pushrods in the new camless valvetrain, therefore a huge amount of torsional friction has been eliminated - the new SYS I3 has ONLY eight moving parts! (For comparison: a standard conrod inline 3 with pushrod valvetrain would have arround 17 moving parts)

For a complete description, please refer to this LPE webpage, at LPEpower.
This motor motor performs 1500 rpms at 4 bars (60 psi) and is selling for 130,00€.
A much more reasonable price than their predecessors, despite still a significant amount of money. However we should look at it from a partcount perspective as each of these motors include some highly priced pneumatic cylinders in the actuality and should take a significant amount of working hours to assemble, test and fine tune.

Below some videos from LPEpower YouTube channel, where you may see SYS I3 in action, inclusive the respective Mustang driveby,

Pushrod V8 engine
Now the most witted and new LPEpower first version of a V8 engine (V8-1.0).

This motor main highlights are:
  • Compact size with only 15 studs of length, while eliminating the crank end-to-end twisting and engine vibration.
  • No V8 ever run so smooth on such low rpms, while at the same time offering 1500 rpms on only 4 bars of pressure.
  • Integrates a centrally positioned balance shaft that also acts as a timing distribution gear. It prevents the crank and camshaft from twisting and enables a very precise operation even under great stress.
  • It uses only 4 valves in the engine, you might wonder why. It enables a more balanced distribution of air to the paired cylinders and drastically reduces a lot of friction. Both are the key for such a smooth operation and for high rpms in a V8.
  • A proper valvetrain geometry must pass the central point of the valve in as few degrees of the camshaft revolution as possible in order to offer the maximum air flow. During one camshaft revolution each valve spends only ~60° in its central dead point, on the other ~300° it offers full potential air flow to the cylinder.
  • The total engine weight is only 410 grams. In LEGO terms that would equal to an aluminum block and heads of a real V8 engine.
  • This engine is actually capable of a much greater speed than 1500 rpms, but it was timing finetuned for the smoothest operation on low rpms and the biggest torque output throughout the entire rev band.

For a complete description, please also refer to this LPE webpage, at LPEpower.
On the videos below, you may see this V8 in action. In standalone and inside the Alex's Mustang,

The V8 sells for 390,00€.


Anonymous said...

Are they using regular Lego motors to power the air compressor in the red car? Or is there some other gadget? Cause I have failed several times to create enough air pressure with the regular Lego motors. Even the 8287 motor + two airtanks were useless with my designs, my cars were hardly faster than a turtle. Am I missing something ?

TechnicBRICKs said...

No! Doubt there is a way to achieve 4 bar pressure, or even close, with LEGO elements.

These LPE motors are feed by industrial like air compressors. Usually in the 50-60 liter range, but also possible with smaller ones around 10 liter.

On the Mustang driveby video, you can see someone (probably Alex or Ivan) running behind the car, with the air pistol and one helical yellow hose, which must be conneted to the compressor (not visible).
From the air pistol tip, there is a thiner hose, which connects to the LPE engine, inside the car.

Anonymous said...

I don't think 130$ is much... The hard work they have around this is simply amaizing... 390$ is quite a bit! :-)

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-Have an amazing day!

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