In message <960724000707_100421.2123_BHG60-4@CompuServe.COM>, Graham
Singleton <100421.2123@compuserve.com> writes
>>>anyone any experience with exhaust pipe insulation?<<
>
>Yep. We used Thermo Tec exhaust wrap,sold by Europa Specialist Spares, 01283
>815609. It is an appalling price and you will need about a kit and a half. IOW
>about 20ft of 1" lagging per pipe. If you buy the stainless strapping it is
>over
>L50 per kit. We found that thin stainless jubilee clips are better.
>BTW it's an American product. Must be an equivalent industrial material.
>Anyway, it will drop your under cowl temps by about 20degC. With a stock Europa
>installation you need all the help you can get under there.
>
Before rushing into lagging remember you might be effectively detuning
the engine as the velocity of sound in gas varies with temperature.
Lagging will certainly increase the gas temperature and thus the mean
gas speed. The system most probably takes account of mean temperatures
of circa 400degC to arrive at resonant lengths to improve pressure wave
port scavenging.
Europa had one of the country's leading exhaust specialists design the
system with emphasis on sound output and torque balancing.
Also some lagging materials which work well on ferrous materials will
eat through stainless in a matter of weeks.
I once met a man who had completely lagged his 582 installation and then
wondered why his flexwing hardly left the ground such was the effect,
though obviously more marked on a two stroke because of the total
dependance of the header length for peak power and torque.
--
Graham E Laucht
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