In Reply to: Why do you think the Pike's Peak Viggen is a 2.0, AdamB [Profile/Gallery] , Tue, 31 Dec 2002 09:54:37

... Per's 2.0 engine could be made to breathe in the same charge that a larger engine would. By increasing the charge pressure and reducing the compression ratio, the turbocharged 2.0 can be made to emulate a turbocharged 2.3 engine as far as maximum torque goes.

What you lose is flexibility at part-load, where the low compression ratio makes for a less-efficient engine. I don't imagine this is much of a problem for the sort of driving that car is intended for. This is the limitation that would adversely affect a road-going car and that Saab is developing the variable-compression engine to overcome (I believe they were producing 225hp from a 1.6 litre engine).

As AdamB points out, if you can produce the same torque as a large engine in an engine with shorter stroke, then you can turn the engine faster and get more power from that torque. I would think that there would be less flexing of the block and crankshaft with a shorter stroke for the same torque output.

posted by 62.253....

• Superpowered Sedans, Bernard Tan, Mon, 30 Dec 2002 21:00:32
  • Reboring the 2.3 would be pretty pointless, AdamB , Tue, 31 Dec 2002 07:57:25
    • more displacement = more power, Chad B, Tue, 31 Dec 2002 09:06:07
      • Re: more displacement = more power, Bernard Tan, Thu, 2 Jan 2003 01:04:31
        • Bernard, check your mail, chad b, Fri, 3 Jan 2003 13:43:12
          • Re: Bernard, check your mail, Bernard Tan, Mon, 6 Jan 2003 01:36:15
      • Why do you think the Pike's Peak Viggen is a 2.0, AdamB , Tue, 31 Dec 2002 09:54:37
        • For the purpose for which it was intended..., BillJ, Tue, 31 Dec 2002 22:52:44 <-- Viewing This Message
        • Smaller engine can be revved higher...., Eric Burr, Tue, 31 Dec 2002 21:57:16
          • Yes that's exactly what I've been saying 0_o n/m, AdamB , Tue, 31 Dec 2002 22:01:01
        • Class limits that it's racing in for one, Trev, Tue, 31 Dec 2002 16:27:59
          • They could have used the 2.3, but they didn't, AdamB , Tue, 31 Dec 2002 21:01:49
        • The Pike's Peak Viggen has a short life, Chad B, Tue, 31 Dec 2002 10:20:05
          • Yes and if they'd used a 2.3 it would have had, AdamB , Tue, 31 Dec 2002 22:06:35
          • You're only allowed to remove so much material..., Street, Tue, 31 Dec 2002 13:32:46
          • Chad's right..., Chad, Tue, 31 Dec 2002 11:56:10
  • Re: Superpowered Sedans, Street, Tue, 31 Dec 2002 03:46:39
    • Re: Superpowered Sedans, Simon S, Tue, 31 Dec 2002 10:42:48
      • Re: Superpowered Sedans, Street, Tue, 31 Dec 2002 13:25:27
        • The facts from a MB Tech..., Jordan, Tue, 31 Dec 2002 18:57:10
          • Re: The facts from a MB Tech..., Bernard Tan, Fri, 3 Jan 2003 04:02:15

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