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Old 11-01-2013, 02:07 PM   #12 (permalink)
HypermilerAX
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Join Date: Apr 2011
Location: Southern France
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AX - '95 Citröen AX

307 - '04 Peugeot 307 SW
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Idle consumption of a 1.5 diesel vs engine temp

Measurement method:
Fuel pumped out of a bottle and weighed with 0.1 g precision. The scale was oscillating a lot though (vibrations?).

I ran the engine for a minute or so in order to expel all the air. I waited for the engine to cool down completely. I noted the value every 10 seconds the first 10 minutes and then 30 seconds until 15 minutes. I attached the raw graph (spaces are due to scale shut down, values in ml/h) and another minute by minute with engine temps but here are the most interesting values:

Avg over first minute : 976 ml/h
2nd minute : 585,5 ml/h
3rd : 571,1 ml/h
...
Avg from 13:00 to 15:30 : 393,3 ml/h

Wow, that is low. I'll think twice before EOCing.

After 15 minutes of idling, the engine wasn't completely warm (especially oil temp) so I will do another test right after a (long) trip.
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Citroën AX 1.5 D 430.000 km
Peugeot 307 SW 2.0 HDI 136 195.000 km

Last edited by HypermilerAX; 11-01-2013 at 02:21 PM..
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