Are you really sure it's 75 dBA at 50 feet? My Ford Escort is 73 dB. . . I don't think any race motor will meet that, no matter what you do.
I'm betting on 95. Chuck Schultz --------------------- On 3/19/07, dan hester <[EMAIL PROTECTED]> wrote:
all you need to do is attach some sort of deflector aiming your exhaust output towards the passenger side of the car as the soundbooth is on the drivers side down the back stretch of the track , this sounds stupid but usually a pop can cut off on an angle works pretty good dan >From: [EMAIL PROTECTED] >Reply-To: [email protected] >To: [EMAIL PROTECTED] >Subject: [F500] Waterford Hills 75 Db >Date: Fri, 16 Mar 2007 15:17:31 -0400 > >My car club has rented Waterford Hills in Michigan for July 24. Does >anybody on the list run there? If so, what did you do to the car to meet >the 75 Db criteria. > >I have an '89 Red Devil with Kawi and have been reading the latest >articles about quieting down our cars. I would definitely wrap my pipes >and try to quiet the air filters. My pipes are Dynoport, and have >mufflers built in, but they are small and not very quiet. Even with >fresh packing in the mufflers I can't run Lime Rock for muffled events. > >Some of the cars at the runoffs last year used an exhaust from the center >of the expansion chamber. The explanation given was that the center >location for the exhaust was quieter. It seems to make sense that the >pulse is at it's greatest intensity at the end of the chamber and less >intense in the larger volume of the chamber. I would like to change my >pipes from exhausting the end of the chamber to the center, then add >mufflers under the expansion chamber. Does this make sense, or am I just >making complication for myself? I think mufflers would fit that way >without violating the 24 inch rule. Also, I think that mufflers from the >center of the chamber would not affect tuned length, is that correct? > >John Ryall
-- Chuck Schultz Anniston,AL [EMAIL PROTECTED] ________________________________ FormulaCar Magazine - A Proud Supporter of Formula 500 The Official Publication of Junior Formula Car Racing Subscribe Today! www.formulacarmag.com or 519-624-2003 _________________________________ _______________________________________________ F500 mailing list - [email protected] To unsubscribe or change options please visit: http://f500.org/mailman/listinfo/f500 *** Please, DO NOT send unsubscribe requests to the mailing list! ***
