DIY_EFI Digest Thursday, July 1 1999 Volume 04 : Number 389 In this issue: [admin] Re: Is the non-digest version working yet? Re: DIY_EFI Digest V4 #388 See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Wed, 30 Jun 1999 15:29:06 -0400 From: jsg@xxx.com Subject: [admin] Re: Is the non-digest version working yet? No, not yet. I would like to find someone that can act as a "relay" for the real-time mail. If someone can volunteer the resource to do this, please email me. In the mean time, it's digest only... please trim the replies and check the subject line. thanks. john gwynne ------------------------------ Date: Wed, 30 Jun 1999 17:10:49 -0400 From: "Gary Derian" Subject: Re: DIY_EFI Digest V4 #388 I was reading my own post when I realized that exhaust is not air, DUH, so this quick analysis needs some more work. Also the fuel burned is now gaseous form. Lets see... 12.5 O2 + C8H18 = 8 CO2 + 9 H2O. Air is 20% O2 so I have to add 50 N2 to each side, so 62 moles of air makes 67 moles of exhaust so we have to add 8% to the exhaust flow. That means 600 cfm is 167 hp at 800 deg F. Gary Derian > > It takes 140 cfm of intake to make 100 hp. Since exhaust is hotter, there > is more. Lets assume 1100 deg F for exhaust and 70 deg F for intake. > (1100+460)/(70+460) = 2.93. Therefore every 100 hp has (140*2.93) = 412 cfm > of exhaust. 600 cfm would be only 145 hp. If the exhaust cools to 800 deg > F by the time it gets to the muffler, 600 cfm would be 180 hp. The engine > could easily stand 1 or 2 psi backpressure so that muffler is good for more > than the above hp levels. If you knew the backpressure at 1000 cfm, you > would better know the flow characteristics of the muffler. > > Gary Derian ------------------------------ End of DIY_EFI Digest V4 #389 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".