[ASH]

Final run with only the stock intake tube insulated. I removed the insulation from the filter box.

Time/Dist……Outside(F)…...Intake(F)……..Filter Box(F)………….…Notes
Start…………………32……………..….. 37…………..…….37....Right side of truck exposed to sun
2 min………………. 33………………....37...……………..37.. ..Idling, warmup
0.5 mile…………….32………………....37…. .……….....35
2.4 mile…………….33....……………..35…†¦â€¦â€¦.......34
4.7 mile…………….33...……………….35…⠀¦â€¦â€¦.......36
6.4 mile…………….33…………..…....35…†¦â€¦â€¦â€¦â€¦...39……..Top of mountain
…………………………......…………†¦â€¦â€¦â€¦â€¦â€¦â€¦.........43………Highest temp after mountain, coasting down other side
8.5 mile.............33................35.......... ....41
10 mile..............33................35......... .....41
.......................35................34.. ............42.........Highest temp @ 55mph
14 mi................35................37........ .....49..........In town, 20 mph
After this point, stopped in parking lot and let truck idle
30 sec..............36................37........ ......56
1 min................37................37........ ......60
1.5 min.............37................37.......... ....64
2 min................37................37........ ......68
2.5 min.............38.................37.......... ...71
Shut truck off and checked data later.
40 min...............40................60........... ...126

Results are very close to the run with the tube and intake insulated. Even when stopped the temperature was only a few degrees higher. I was surprised by this, I thought wrapping the air filter box would give better results.

Note though, the material I used to wrap the intake tube probably had a much higher insulating value than the material I used to wrap the filter box and the corrugated tubing. The temperatures for the test on 3/15/06 may have been a little lower if I had used the better insulating material. But don't forget to look at the temperature measured at the inlet of the pipe. The air being pulled in from the engine compartment starts out warmer.

So a quick summary, insulate your intake tubes, especially where the tube crosses the exhaust manifold. It is better to pull air from outside of the engine compartment, either from stock location or from the front. Again, I was only looking at temperatures. I did this test so I can get started on building my own CAI. It's been interesting and I hope informative. If I can figure out how to get a spreadsheet inserted into the post, I will give a summary of all the tests in a neat table format.