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Heads Under Pressure

The Instrumented Head project, led by Nick Harker, Chris Tockey, and Peter Britanyak, aims to enhance snowmobile performance through a re-designed combustion chamber featuring integrated pressure sensors. Key specifications include a dome radius of 0.75 inches, squish velocity of 15-20 m/s, and a compression ratio of 6.5:1. The project includes comparing combustion chamber iterations from 2004 to 2006, focusing on optimal sparkplug positioning and adapting the design for Skidoo and Polaris models. Current progress includes acquiring materials and tools, and preparing for machining and testing.

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Heads Under Pressure

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  1. Heads Under Pressure Design Project: Instrumented Head for the Clean Snowmobile Challenge Nick Harker Chris Tockey Peter Britanyak

  2. Project Goals: • Head Re-designed with pressure sensors for in-cylinder pressure data. • Modify the combustion chamber to given specs.

  3. Combustion Chamber dimensions and Specs • Dome radius .75 inches • Cone to plug distance is -.08 inches • Squish velocity of 15-20 m/s • Squish diameter of 1.95 inches • Squish radius from cone to squish .25 inches (double turbo head) • No dome offset • Squish area same as turbo head 34% • Dome height approx. 1 inch as necessary for compression ratio • Dome angle needs to be determined for the correct compression ratio • Compression ratio of 6.5:1

  4. Design comparison 2004 to 2006

  5. Combustion Chamber Iterations Sparkplug boss protruding into combustion chamber Drawing showing the location of a regular and extended electrode Final iterations of unsymmetrical combustion chambers to bring the sparkplug electrode into the fuel cone

  6. Final Design for Polaris 600

  7. Injector and Sensor Boss Injector and sensor boss passes through the cap to reduce the over all height.

  8. Skidoo 600 Head Design Skidoo sled will be much easier to adapt to our system

  9. Skidoo Head Skidoo Combustion Chamber Polaris Combustion Chamber

  10. Water Jacket Comparison Skidoo Head Polaris Head

  11. Current Progress • Head designed • Aluminum stock arrived • Received Kistler pressure sensor tools • Received ARP head bolts and gasket material

  12. Current Tasks • Get solid model approved for manufacture Sept. 19 • Complete MasterCam Oct. 9 • Begin machining Oct. 11 • Testing End of Oct.

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