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Recent content by thephantom

  1. thephantom

    Extreme bore stroke ratio

    Well, DJ, now you've got me interested you've got to tell us more. Watercooled? What head? what power? Can you spill the beans?
  2. thephantom

    Very short stroke 250cc single! Advise appreciated.

    Great minds etc. GT, tell me more about the set up and what type of racing its for. I'll put some stuff through my Engine Analyser and see what comes out. Need valve sizes, head config. port sizes and lengths, air/water cooled etc. What is the basic engine your starting with and what are the...
  3. thephantom

    Extreme bore stroke ratio

    Gtrack, Your bore stroke ratio at 1.6:1 is pretty normal by todays motorcycle standards. Most oversquare I can find in common usage is Ducati 998 @ 1.77:1. Haven't progressed any further yet but will update IF it ever runs.
  4. thephantom

    Extreme bore stroke ratio

    I build and race small (150cc) 4 stroke roadrace motorcycles. The new engine I'm building has a bore of 75mm and a stroke of 35.5mm and is a water cooled 4 valve. Has anyone had any practical experience, as apposed to theoretical, on anything like this? My 2 valve air cooled twin 150cc is making...
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