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
More Like This
LATEST VIDEOS View All
Polaris SKS Project Sled: PART 3
December 5, 2017
AJ's back in the TRAIL TECH shop with his 2016 Polaris SKS project sled build adding some ...
Polaris SKS Project Sled: PART 2
December 4, 2017
AJ’s in the TRAIL TECH shop doing more work on his 2016 Polaris SKS project sled!
Polaris SKS Project Sled: PART 1
December 3, 2017
AJ's in the TRAIL TECH shop installing an MBRP aftermarket exhaust on his 2016 Polaris SKS ...
Riding Summits with Carl Kuster
December 1, 2017
AJ heads back to Sicamous BC to ride with Carl Kuster this time in-tow with his brother and ...
2017 Rider Reactions - Timbersled
November 30, 2017
Hear what first-time riders as well as owners have to say about Timbersled.
Top Gear View All
November 7, 2017
Helium 30 Lightweight Gear from Ski-Doo
BRP’s Ski-Doo snowmobiles is expanding and renewing its Helium 30 mountain outerwear with new colors and more options in both men’s ...
Ask Motorhead View All
November 21, 2017
BEST SLED FOR MY WIFE
Motorhead Mark offers his honest opinion to a viewer on whether or not to buy his wife a 4-stroke sled. See what he has to say...
Press Releases View All
December 11, 2017
Snowmobiling Is Good For Your Health
Snowmobiling Is Good For Your Health And For Beating the Winter Blues
Tourism View All
December 6, 2017
Timmins to Chapleau Snowmobile Loop
Another Major Snowmobile Connection Reopened in Northern Ontario!