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Originally Posted by Jeffvette
The spacers also help control heat loosely. You have to remember the whole motor is a heat sink and when it starts to heat up it will radiate the heat. The plenum will still get hot.
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I hear ya, Jeff. The barriers are only effective to the degree they reduce the flow of engine heat into the plenum by way of direct conduction. Radiation from the engine will not be affected. After a hot soak in a parking lot on a summer day, the plenum will be very close to that of the engine, regardless of heat barriers. Only after the engine runs for a few minutes - the faster the better - will the plenum cool (somewhat) and air density increase (theoretically).
I'm intrigued by the plastic plenums used on the LSx engines... The entire plenum is a very low conductor of heat, and has a relatively low 'specific heat' value (read: it does not retain much heat & will cool rapidly). And, the inside of the runners are glass smooth...not a bad thing! So, it's fun to think about what value such a plenum might offer to the LT5 as well...
Just makin' conversation here...
P.