HYPERSLED ENGINES: ARCTIC CAT 800 DSI CTEC-2
We waited a long time for this new engine from Cat and the most tempting part was it had an excellent model preceding it, the 600 CTEC-2. Naturally, we were expecting greatness from it.
The key element to keep in mind with this engine is the difference in the way it lubricates its bottom end compared to the squeaky-clean Ski-Doo E-TEC.
Ski-Doo's Direct Injection technology on both the former 800 and 600 allowed no fuel or oil mix into the crankcase (although the new 850 actually does have a pinpoint oiling system) and lubricates the sealed bearings down there with a special permanent grease.
In the Arctic Cat DSI, which stands for Dual Stage Injection, the injectors are located on the cylinder (not in the transfer port) and inject oil and gas mix onto the top of the piston as it's moving to bottom dead center.
When the piston is at top dead center again the injectors spray oil and gas mixture into the crankcase through the slot machined into the side of the piston. Thus DSI allows gasoline to cool the bottom end and oil to lube it at the same time.
This makes for great reliability but it's harder to get super-clean EPA results with any 2-stroke allowing fuel into the bottom end.
Good results are accomplished on the DSI with very precise fuel and oil monitoring from an electronic oil pump and tight EFI calibration.
Since fuel and oil are being injected into the crankcase and not just randomly scavenged like on the old 800, amounts can be regulated to a very lean condition without damaging the crank or rod bearings.
The cylinder walls and piston rings are carefully lubed the same way by the mixture being transferred onto the top of the piston.
Cat has been able to maintain excellent durability with this design and because of its precise fuel metering, is both EPA clean and offers a much more responsive tip-in at the throttle.
The net result is more torque at low speeds and comparable top end at the end of the lake.
More Like This
LATEST VIDEOS View All
2019 4-Stroke Turbo Comparison: Yamaha VS Ski-Doo
January 17, 2019
Luke hosts a comparison of the growing 4-stroke turbo segment involving the 2019 Ski-Doo Renegade ...
Ski-Doo's Reach for the Summit Sweepstakes at CKMP
January 16, 2019
Luke and AJ bring along the very lucky winner of the Ski-Doo Reach for the Summit Sweepstakes ...
Full Review of the 2019 Arctic Cat ZR 9000 Thundercat 137
January 15, 2019
Motorhead Mark rekindles all his fond memories of Arctic Cat’s iconic lake racer with his ...
SnowTrax Television 2019 - Episode 3 Sneak Peek
January 14, 2019
Our review of the 2019 Sidewinder SRX!
Vote for North America's Top Snowmobiler - QUARTER FINALS ROUND TWO
January 11, 2019
In collaboration with Ski-Doo, we’re on the search again to find North America’s Top Snowmobiler ...
Top Gear View All
January 14, 2019
ROLLABLE EASY-LOAD RAMP BY DGRP
This unique and ingenious ramp is extremely easy to use and will have your sled loaded in the back of your pick-up in a matter of ...
Ask Motorhead View All
September 26, 2018
850 Switchback XCR vs. Renegade XRS
If you were choosing between the XCR 850 Switchback and the XRS Renegade which sled would you go with?
Press Releases View All
January 10, 2019
Extended Length Brake Line for Ski Doo Gen4 Chassis
If you are raising your bars 3" over stock or more, you will most likely need an extended length brake line.