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Originally Posted by Piwoslaw
So what's the secret?
Wouldn't just plain hypermiling keep the temp down? Less fuel used for the same distance = greater efficiency = less energy wasted as heat. Judging from the number of new "Why does my fan keep turning on?" posts at my local Peugeot forum every spring, I can tell that my turbodiesel stays cooler than others, even with a (partially opened for warm weather) grill block.
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No secret, as I said it's easily found on the net. I'm not technically minded so I didn't want to insult by posting my own version of it here, but essentially, apparently the water pump on the old 1.4 isn't very strong at all, to the point where it doesn't have enough power to keep older engines from overheating even at idle.
Some owners have changed the thermostat, which seems to be overly optimistic about how hot the engine is getting. Usually, the engine gets too hot, overheats and the head gasket goes. The mod seems to fix this problem, the guy who suggested it has 188k miles on his 1.4 diesel now which is amazing for such a small car.
I found the tip
here, for reference.
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PSA's 1.5 diesel is better than the 1.4 - it's newer, has cleaner emissions (that's why the 1.4 got phased out), and is EOBD. It's also got slightly more power/torque at about the same fe.
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That seems to be the general consensus. Performance is nothing special but not too bad considering it's intended use (let's face it, if you want a fast 106 you get a Rallye or GTI), but economy is very good. 50mpg (imperial gallons) should be pretty easy. And as we're seeing with someone more economically minded, even more is quite possible.
I've been seriously considering a 106 diesel recently as a daily driver, following what I've seen in this thread and researched into. I reckon with some choice modifications, you could have a car that comfortably averages over 50mpg (imperial again), and could quite easily achieve over 70mpg in gentle out of town driving.
Small, reliable diesel engine, small frontal area, narrow tires... it's basically built for economy. Lower it a bit, give it a few aero tweaks and you'd get some seriously impressive figures.