Cylinder Deactivation Could Drop a Corvette Down to 2 Cylinders

General Motors may use an advanced cylinder deactivation technology, co-developed with Delphi and Silicon Valley startup Tula Technologies, in its SUVs and V-8 cars to shut down up to six cylinders to maximize fuel economy, Automotive News reported.

According to the automaker, GM in 2012 invested in Tula, which specializes in automotive engineering. The automaker announced in January that it would pursue the advanced cylinder deactivation technology for some of its SUVs, which could improve fuel economy by 15 percent in cars with engines with more than four cylinders.

The system, dubbed Dynamic Skip Fire, keeps the throttle open during operation and controls cylinder firing through a special valve that cuts off oil to the deactivated cylinders’ valve lifters. According to the company, the engine computer changes the deactivated cylinders to avoid vibration or noise.

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GM Banking On Dynamic Cylinder Deactivation For Improved Fuel Economy

General Motors has played with cylinder deactivation technology since the days of Carter, sometimes successful, sometimes with more disastrous results.

With Tula Technology’s Dynamic Skip Fire, GM is banking on the former.

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  • MaintenanceCosts This was one of the only good engines Subaru ever made wrapped in a body made of human repellent.
  • MaintenanceCosts Headed soon to occupy four parking spots at your local Costco.
  • MaintenanceCosts I have yet to drive either this one or its Pathfinder sibling. I had zero objection to the CVT in their predecessors, though. You need smoothness more than instant response in this class of vehicle, and it was possible to drive the CVT-equipped Pathfinder very smoothly indeed. Both it and my own "eCVT" Highlander Hybrid are much better in that respect than the last 8-speed Sienna I drove, and I'll be surprised if I actually think the 9-speed is an improvement.
  • Tonycd Bullnuke, I had my own run-ins with Farago, who described himself to me with some accuracy as a southerly bodily orifice. But on balance, that site was a damnsight more interesting than the cost-cut ad vehicle that VerticalScope has turned it into since.