<br><font size=2 face="sans-serif">Without actually being privy to what these guys are using resin wise, but experienced in identifying cured resins, I would venture to say the the ES pipe is an aromatic amine cured epoxy that is made by Shell Chemical , 8500 series. It is a liquid that cures at a temperature about 200-250 F then can be post cured to give a glass transition temperature (Tg) of about 350F. This means at 350F the resin goes from the hard glassy state to a more "rubbery" state. The Tg is usually when there is little to no structural capability, but these temperatures do not necessarily damage the resin. When over exposed to temperature above the Tg like the 425-450F exhaust, the resin will break down. The Bolly appears to be a Bismaleimide resin which is a room temp semisolid resin that has a Tg of 425-450 hence better header exhaust resistance. The leaking of the pipe is most likely a result of the wet-layup manufacturing method us!
ed, leaving pinholes. Bolly's also have a kevlar outer layer which absorbs water which gases off during cure creating pinholes. </font>
<br><font size=2 face="sans-serif">And then there is the chance I am guessing wrong......</font>
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Gray Fowler<br>
Principal Chemical Engineer<br>
Composites Engineering</font>
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<td><font size=1 face="sans-serif"><b>s.vannostrand@kodak.com</b></font>
<br><font size=1 face="sans-serif">Sent by: discussion-request@nsrca.org</font>
<p><font size=1 face="sans-serif">03/25/2003 12:47 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"> Subject: Re: question regarding header & tuned pipe</font></table>
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Bolly mufflers use a very different kind of resin that is more temp resistent than the ES pipes. It will become brittle over time, but will not ablate. Bolly's also eventually leak like a seive over their length eventually.</font><font size=3 face="Times New Roman"> <br>
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--Lance</font><font size=3 face="Times New Roman"> <br>
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<td width=42%><font size=1 face="sans-serif"><b>Ron Lockhart <ronlock@comcast.net></b></font><font size=3 face="Times New Roman"> </font><font size=1 face="sans-serif"><br>
Sent by: discussion-request@nsrca.org</font><font size=3 face="Times New Roman"> </font>
<p><font size=1 face="sans-serif">03/25/2003 10:11 AM</font><font size=3 face="Times New Roman"> </font><font size=1 face="sans-serif"><br>
Please respond to discussion</font><font size=3 face="Times New Roman"> </font>
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To: discussion@nsrca.org</font><font size=3 face="Times New Roman"> </font><font size=1 face="sans-serif"><br>
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Subject: Re: question regarding header & tuned pipe</font></table>
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Lance,<br>
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Would you know, is the end of the pipe being exposed to exhaust <br>
gas a concern with the Bolly pipes & mufflers?<br>
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TIA Ron Lockhart<br>
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----- Original Message -----<br>
From: s.vannostrand@kodak.com<br>
Date: Tuesday, March 25, 2003 10:52 am<br>
Subject: Re: question regarding header & tuned pipe<br>
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> Every change in backpressure, due to the expansion chamber or <br>
> header change will cause a wave reflection, however, the effects of <br>
> necking down from 7/8 to the approx 3/4" OS pipe will not be much. <br>
The bigger problem is that if the pipe is composite (CF) you will <br>
ablate the pipe input and ruin the pipe. I've seen 3 of these for <br>
repair. The hot exhaust gasses can not be allowed to contact the end <br>
of the fibers and resin for most resins. ES pipes fail in this <br>
fashion. Some people have been successful in using a squishy coupler <br>
(like the Macs grey) but this is not a reliable setup for most people. <br>
> <br>
> The Mintor carbon fiber pipe (I have a N.I B. one for sale for <br>
> $160 including shipping) uses an aluminum inlet to prevent this. I <br>
> also have a Macs to OS adapter made from aluminum for $12.<br>
> <br>
> -Lance<br>
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