question regarding header & tuned pipe

[s.vannostrand at kodak.com]

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. 

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.

-Lance





"Ihncheol Park" <PatternFlyer at msn.com>
Sent by: discussion-request at nsrca.org
03/24/2003 09:03 PM
Please respond to discussion

 
        To:     "NSRCA" <discussion at nsrca.org>
        cc: 
        Subject:        question regarding header & tuned pipe


Hi, All,

I have a question regarding the header & tuned pipe.

I will be testing a really light Tuned pipe (Japanese F3A pilot is testing
the pipe on OS 140).  It is 550mm length, 48mm diameter, 18mm inlet
diameter.  38g for weight.  I will have to weigh it before believing the
weight of this pipe.
I believe the pipe is being tested with Hatori/OS header

My headers have diameter of 20mm ~ 22mm (Macs headers) that is larger than
the inlet of the pipe.

Does the differences in the diameter of Outlet of header and Inlet of pipe
make differences when tuning for the pipe?
thanks,

Ihncheol Park

1973 White Ave., #402
Moscow, ID 83843
(208) 883-7882 (home)
(208) 661-5018 (cellular)
PatternFlyer at msn.com


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