$40,000 Thermal Camera - Watching Engines Warm Up

Опубликовано 8 марта 2017, 15:00

Watching Cold Engines Warm Up With A Thermal Camera
Flir One Thermal Camera - amzn.to/2j2gnNh
Full Unedited 15 Minute Warm Up - youtu.be/W6_lv2UNQAg
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Products Used:
FLIR T1K Camera - amzn.to/2mgV8XS
Temperature Datalogger - amzn.to/2n3NPDe
Garmin 4K Camera Used - amzn.to/2fZSSQ0
Data Overlay OBD2 Link - amzn.to/2fZMYi3

Watching two different engines warm up using a $40,000 Flir T1K thermal camera. The cold starts we’ll be observing include a 2016 Subaru Crosstrek on the left, which has a 2 liter boxer four-cylinder engine, and a 2002 Honda S2000 on the right, which has a 2 liter inline-four cylinder engine.

All of the temperature data points, one through five, represent the exact same thing for each vehicle, measured in Celsius. Point one is the exterior temperature of the oil filter, point 2 is the heater core coolant line, point three is the top radiator hose, point four is the front of the engine block, and point five is the intake manifold, before the air is distributed to each of the cylinders. Both of the engines start at the exact same time, so you can compare these figures directly based on the time stamp shown on screen.

On the right of each of the thermal images is a sliding scale, which adapts to the image and shows the temperature range on screen. The bottom number, in Celsius, and wherever there are dark spots, represents the coldest area. The top number, and wherever there are white spots, represents the hottest area.

Beneath their respective videos, we also have the air intake temperature, coolant temperature, and engine RPM read directly from the vehicle. For the duration of the video, the temperature of the ambient air around the car remained at about 7 degrees Celsius.
Finally, I’ve added a plot in the bottom right corner showing oil temperature with respect to time. This temperature comes from a thermal probe inserted down each of the vehicles dipstick tubes.

By this point, you can start to see that the intake manifold temperatures, point number 5, differ for each. The Crosstrek has a plastic manifold, elevated away from the engine, which does a better job of keeping intake temperatures down versus the aluminum manifold of the Honda, which is tucked within the engine bay and close to heat sources. By the end of the video, the Subaru has over a 20 degree advantage in intake temperatures versus the Honda, and yes, both of them are still pulling in the exact same 7 degree ambient air.

EMISSIVITY NOTE: For anyone concerned about emissivity and the temperatures you're witnessing, I just did a quick test in my kitchen to verify the temps we're seeing. I took a sheet of paper (emissivity ~0.9+) and a sheet of aluminum foil (emissivity ~0.05), while the camera was set for an emissivity of 0.95. The camera accurately read the temperature of both items (about 20 deg C). Then I switched the camera's emissivity to 0.04. The aluminum foil's temp then varied widely, from 0 deg C to 50 deg C (it was still at 20 deg C, the temperature inside my home), while the sheet of paper now incorrectly read 30 deg C. To me, this shows that with the camera set at 0.95 for emissivity, readings will be accurate, and it has a way of calibrating for various emissivity coefficients of what's in view. This video was recorded with emissivity set at 0.95.

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