Ski-Doo MX-Z E-TEC 600
Technical Take-Away: Engine Efficiency
We've written much about E-TEC the last 20 months or so and Ski-Doo's latest 2-stroke engine technology continues to impress us with its incredible EPA cleanliness, astonishing fuel economy and impressive power.
When it comes to 2-strokes, no one is on the same game board as Ski-Doo and likely won't get there anytime soon.
The keynote technology with E-TEC is direct injection. DI uses similar engine mapping principles to EFI or SDI systems and even a series of sensors to report pertinent data on throttle position, engine load and temperature back to a common computer processor.
The difference is that E-TEC has its injectors positioned at the very top of the combustion chamber on the cylinder head. These unique voice coil activated injectors are programmed to inject fuel within a 15-degree window of the 2-stroke cycle, at the precise, optimum millisecond of scavenging.
The results are threefold: A very strong power stroke, a very clean and thorough burn and the lowest fuel-to-oxygen-ratio possible. The last benefit means you use less fuel to get the same pop you would with a higher ratio of fuel-to- air.
The 600 E-TEC also features a liquid cooled crankcase. This is important technology when you're dealing with extremely lean burning 2-strokes (Remember, all the fuel is being injected at the top of the engine - 2-strokes normally scavenge their fuel from the crankcase upward, via transfer ports).
On a DI engine, because there's no gasoline getting into the bottom end to cool it, crankcase temperatures skyrocket. By liquid cooling the engine's bottom half as well as the top, temperatures are kept at acceptable levels and the engine's lifespan is much more secure.
As mentioned, we've had about 20 months of real world testing with E-TEC and, despite it's impressive beginnings, it continues to get better and better. Fuel economy is absolutely amazing - our E-TEC 600s have all reset the dial on mileage figures we originally thought snowmobiles should be able to get to.
2009 E- TECs were remapped from the original prototypes we rode and, with a very slight compromise in gas mileage, delivered class leading performance. This engine already exceeds 2012 EPA standards and is raising the bar very high for the competition.
We're waiting impatiently for more E-TEC engines to arrive on Ski-Doo's roster - especially an 800 E-TEC.
Click here for specs
LATEST VIDEOS View All
BEST TEST RIDE OF 2017
April 18, 2017
We've evaluated a ton of sleds this season and now we want to know which test ride YOU liked ...
TEST RIDE: 2017 Yamaha Sidewinder R-TX SE
March 30, 2017
In the final edition of Test Ride for the season, Mark Lester zooms over the frozen lake on ...
2017 Revolutionary Advanced Design Award
March 29, 2017
AJ presents the winner of the 2017 Revolutionary Advanced Design Award to the technology that ...
2017 Real World Sled of the Year
March 28, 2017
Our pick for 2017's Real World Sled of the Year in a final showdown between Yamaha, Arctic ...
Top Gear View All
Ask Motorhead View All
March 30, 2017
SNOWMOBILE EXHAUST MODS
It is disturbing that you promote illegal exhaust modifications. The Ontario Motorized Snow Act makes it illegal to modify the exhaust ...
Press Releases View All
August 10, 2017
Timbersled Partners with AMA for EnduroCross
2017 partnership cross promotes snow bikes to EnduroCross racers and fans.
Tourism View All
February 3, 2017
CAMP CONEWANGO RE-OPENS
Conewango in Redbridge, Ontario Canada is back and under new ownership.