as some of you guys might have seen from another topic I started (http://forums.hybrid...ep-off-the-gas/), I've been giving some thoughts to the air intake temperature.
Afer poking around the engine while it was still warm, I realized that all the metal air pipes (duh, yeah i know, but it's important for heat conduction) were exposed to the warm engine bay air, and to the engine's radiating heat, and that the radiator's fan blew hot air pretty much directly on them. Touching all these nice pipes, I realized that the pipe from the turbo to the intercooler pretty much too hot to touch (duh again, I'd read about the heat coming from compressing the air but you don't realize how hot till you experience it).
I also realized that the pipe from the intercooler to the throttle body started off cool and ended up very warm (can touch for a few seconds) close to the TB. The transition was quite sharp where I've placed a heat shield (sheet metal cut to fit around the pipes to try to limit the filter breathing in air from the engine bay - it didn't make much of a difference for the air temp there). I don't know if the heat shield is helping or it's just because the hot air blown by the fan hits the pipe from there on...
I started looking around on the net, and some people had also thought of insulating this particular pipe. There is some debate as to the usefulness of doing this, and none of the sites were particularly methodical with the data taking, so i figured I'd try it, and gather before and after data too.
Here is a series of pictures as to what I did to insulate the pipe (after gathering data; more on this later)
1- intake piping original.jpg 231.17KB 4 downloads
this is the piping system, as I got the car (plus the heat shield I made)
2- insulating foam tube cut.jpg 511.04KB 2 downloads
This is the insulation I've used. It's a foam tube to insulate house piping bought at a hardware store for 5$ for 6 feet, 2inch diameter. as you can see, I cut triangles out so I'd be able to bend it to follow the pipe. I eyeballed the cuts, and had to make the triangles wider only once to be able to follow the curve of the pipe
3- insulating foam tube cut 2.jpg 513.08KB 1 downloads
this is the other side, since the pipe is s-shaped.
4- insulation half on.jpg 486.3KB 1 downloads
with the foam almost all on the pipe to illustrate the use of the cuts
5- insulation all on.jpg 415.84KB 1 downloads
With it all in place.
6- insulation tie wrapped.jpg 444.19KB 0 downloads
tie wrapped on, ghetto style with ugly, white, break-if-you-look-at-them-too-long tie-wraps I had around
7- insulated and shielded.jpg 475.88KB 3 downloads
The final product, with the heat shield seen from a different angle. I know there are gaps in the insulation, but i figure this can be a prototype and i can make it better if it turns out to be useful....
I'll try to post tomorrow on the data I've gathered about the intake temperature before the insulation mod; the file is on my work computer. I've gathered a bunch of info on how fast the temperature goes up once I'm parked iddling after the drive to work. I've got graphs and all, easy to read. post insulation data will be another week or so, I'm guessing, since I don't drive it to work every day (t-tops were leaky, and I've recently cut out part of the floor to fix rust, so no driving when it's wet)
I'm also planning on changing the air filter location and making a cold air scoop under the radiator mount, so that and other data will be useful on that too. Stay tuned for other topics I'll start when I gather the supplies I need, the main supply I lack being time)...
Comments and suggestions welcomed, follow this post if you're curious to see how it turned out.
******************************see posts 2 and 5 for info, and post 15 for a pre-emptive conclusion********************************
Edited by supernova_6969, 26 June 2015 - 06:35 AM.