<br><font size=2 face="sans-serif">Every change in backpressure, due to the expansion chamber or header change will cause a wave reflection, however, the effects of necking down from 7/8 to the approx 3/4" OS pipe will not be much. The bigger problem is that if the pipe is composite (CF) you will ablate the pipe input and ruin the pipe. I've seen 3 of these for repair. The hot exhaust gasses can not be allowed to contact the end of the fibers and resin for most resins. ES pipes fail in this fashion. Some people have been successful in using a squishy coupler (like the Macs grey) but this is not a reliable setup for most people. </font>
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<br><font size=2 face="sans-serif">The Mintor carbon fiber pipe (I have a N.I B. one for sale for $160 including shipping) uses an aluminum inlet to prevent this. I also have a Macs to OS adapter made from aluminum for $12.</font>
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<br><font size=2 face="sans-serif">-Lance</font>
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<td><font size=1 face="sans-serif"><b>"Ihncheol Park" <PatternFlyer@msn.com></b></font>
<br><font size=1 face="sans-serif">Sent by: discussion-request@nsrca.org</font>
<p><font size=1 face="sans-serif">03/24/2003 09:03 PM</font>
<br><font size=1 face="sans-serif">Please respond to discussion</font>
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<br><font size=1 face="sans-serif"> To: "NSRCA" <discussion@nsrca.org></font>
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<br><font size=1 face="sans-serif"> Subject: question regarding header & tuned pipe</font></table>
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<br><font size=2 face="Courier New">Hi, All,<br>
<br>
I have a question regarding the header & tuned pipe.<br>
<br>
I will be testing a really light Tuned pipe (Japanese F3A pilot is testing<br>
the pipe on OS 140). It is 550mm length, 48mm diameter, 18mm inlet<br>
diameter. 38g for weight. I will have to weigh it before believing the<br>
weight of this pipe.<br>
I believe the pipe is being tested with Hatori/OS header<br>
<br>
My headers have diameter of 20mm ~ 22mm (Macs headers) that is larger than<br>
the inlet of the pipe.<br>
<br>
Does the differences in the diameter of Outlet of header and Inlet of pipe<br>
make differences when tuning for the pipe?<br>
thanks,<br>
<br>
Ihncheol Park<br>
<br>
1973 White Ave., #402<br>
Moscow, ID 83843<br>
(208) 883-7882 (home)<br>
(208) 661-5018 (cellular)<br>
PatternFlyer@msn.com<br>
<br>
<br>
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