| Additional graphs under the hood |
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| #1- red, is in the origional frame hole, fresh air into filter box #2 - dark green, is in the intake manifold plenum, to measure the temp of the air going into the engine #3 - brite green, is measuring the air between the intake and the radiator hoes that runs below it. #5 - dark blue, is measuring the temp of the computer box, to see how hot the electronics get #6 - fuschia, is measuring the temp of fuel pressure regulator, that comes with the Hahn kit, to see how hot it gets on the firewall The car was started and driven 15 miles then shut down at 1500 sec into the test. The rest is cool down time. Most of the drive was interstate, at 55 mph. At about 1300 sec, we sat at a light, then drove another 1/4 mi and shut down. The car cooled to the 2400 sec mark. Nothing was touched or opened. This test was to look at some of the other areas that different people have asked about, or wished they knew the temps of. |
| I will try to explaine what I see from these graphs, and tell you what I was looking for. Air temp was 84 f (#1 - red) ... This sensor was placed in the open hole that used to hold my air cleaner intake. For the most part this was breathing air very close to outside temp. At about 1300 seconds, I was stopped at a long light. I believe the fan came on while I was sitting and actually blew hot air out of the hole, from inside the engine bay. Once we started moving again, the air reversed directions and cool outside air came back in through the hole. We only drove 1/4 of a mile or so and then parked the car at 1500 sec into the test. With the car at rest and the engine off, you can see what the temps did for the next 900 seconds, (15 min.). (#2 - dark green) ... This sensor was inside the intake manifold, to measure the air temp going into the engine. I poked a very small hole in the big soft rubber line, on the back of the manifold, just behind the hose barb. I then pushed a thin 3" lond sensor through the hole, through the barb and into the manifold plenum about 3". I wanted to see how much of the heat from the engine bay, was really conducting into the air streem that is going into the engine. That temp is represented by sensor (#3 - light green). This sensor was measuring the air between the raditor hose and the intake runner right above it. It was suspended between the manif. and the hose.(about 1/2" between each side) The intake is made of the same nylon material that many of the car manufacturers are using, because it does not transfer heat well at all! It may feel hot on the outside, but it is not on the inside. You can see that the air on the outside is 160 f or better, but the air inside is barely over 100 f. The air comming through the radiator is 130 f or better so the rest of the heat on the light green sensor, is coming from the radiator hose. The water temp is 200 f +. ... I don't see a lot of heat picked up by the air inside the intake manifold. Now when the engine is shut off and the hot air in the engine, drifts up to the sensor, through the inside of the runner. Now you see the temp climb! #5 - dark blue is measuring the temp of the computer box on the fire wall. It faired better than I thought, considering all the hight temps at the back of the engine. Being off to the side, helped a lot! Plus it is heat-sinked to the cars firewall, to help cary away the heat, through metal to metal conduction. The funny pinkie colored one, (I don't think I spelled right), but that sensor was solid bolted to the regulator to see what kind of temp it absorbed being on the firewall as well. The regulator has fuel from the tank running through it all the time. This fuel has a cooling effect on the regulator, as long as the engine is running. We can see that even though the regulator got much hotter, once the engine was shut down, it cooled right off quickly, when we started back up. Those are my impressions at first blush! I have only looked at these graphs a short while, so they may need some more study. I am not a thermal dynamics engineer, so there may well be others that read this info differently.. I offer this as a glimps into the engine bay of MY car with turbo in place and rubber strips missing!! Thanks, Bob |