[Main Performance Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Re: spearco a/l Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by Kevin K [Email] (#374) [Profile/Gallery] (more from Kevin K) on Wed, 19 Dec 2001 17:18:40 In Reply to: Re: spearco a/l, Alex, Wed, 19 Dec 2001 16:21:11 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

long before spearco was bought out by turbonetics, I talked with spearco guys, with george spears? present and indirectly answering my questions.
using scfm ratings for ICs is not a standard method, just what george did.

I'm sure he used the approximate hp formula I provided, based on typical bsfc and a/f for turbos. garrett does same thing to relate air flow and hp.

it is a logical way to quickly rate a lot of sizes, ball park power, and compare differences. One can always sharpen the pencil, determine their own hot flow rate into IC and out, get an ave, and compare against the cold flow charts for pressure drop.

your formulas are correct, with assumed bsfc and a/f, and both can vary depending on engine specifics. as an extreme case, for 3rd gen rotary, typical is .6+ and 11:1, not very efficient.

If Jeff gets the unit I mentioned, no calculation needed for pressure drop...

posted by 52.128.30....

• What's the formula for..., Jeff Cunningham, Wed, 19 Dec 2001 07:43:03
  • spearco a/l, Kevin K , Wed, 19 Dec 2001 15:03:15
    • Re: spearco a/l, Alex, Wed, 19 Dec 2001 16:21:11
      • Re: spearco a/l, Kevin K , Wed, 19 Dec 2001 17:18:40 <-- Viewing This Message
  • Pressure Drop, Alex, Wed, 19 Dec 2001 13:42:37
  • Re: What's the formula for..., Kevin K , Wed, 19 Dec 2001 10:13:38
    • That Was Funny Kevin K....Really, Shaun , Thu, 20 Dec 2001 06:56:12
      • valve spring failure ..., Kevin K , Thu, 20 Dec 2001 10:04:10
        • Re: valve spring failure ..., Shaun , Thu, 20 Dec 2001 16:28:42
          • 3%, Kevin K , Thu, 20 Dec 2001 20:36:44
            • Re: 3%, Shaun , Fri, 21 Dec 2001 07:15:44
          • Re: valve spring failure ..., chrisx, Thu, 20 Dec 2001 16:47:21
            • Thanks. nm, Shaun , Fri, 21 Dec 2001 07:12:14
  • Re: What's the formula for..., John delRosario, Wed, 19 Dec 2001 08:55:21
    • Need BSFC, Alex, Wed, 19 Dec 2001 11:26:16
  • Re: What's the formula for..., Shaun , Wed, 19 Dec 2001 08:26:49

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