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It's still a chemical reaction though. Forgive me if I misinterpreted but I took your "filtering" as a method to stop and extract the NOx before it reached the atmosphere but not actually chemically modify it. This wouldn't work for the simple reason that there's only so much you can back up...

It does specify that the nitrous oxides are removed via catalysts. Wammers is right; gases cannot be filtered out, at least certainly not without almost stopping the flow; they're reacted out. Check out Top Gear 13x05 for an interesting albeit impractical chemical method to completely remove CO2...

How is that policed? Do you have to log and provide evidence of the amount you've used? Or is it just assumed that nobody will cross it unless it's obvious?

The time you most need aircon then :D

Doesn't it kick in at a temperature very close to the overheat though?

Based on the above yes, but only as a backup! I believe it uses the AC fans though rather than fitting new ones, does your P38 have AC?

The diesel

Reason 872 for it..... :D

OK it's a bit harder to maintain than that :P but I'm glad it's behaving itself at the moment :) Just get it checked at the very least as engines don't just randomly overheat every now and then, so something's on it's way out. As mentioned, sticky thermostat or fan's a likely cause. If it...

Suspected as much :(

What's the reasoning for it being illegal?

The cooling system on the 4.6 MUST be fully functional, especially with weather like this, or disaster will occur! It's only just suitable as it is. The good news is that it's fairly easy to maintain :)

Larger engine = more fuel is only true if the engine efficiencies are the same, hence why modern cars are much more economical than their predecessors not just by virtue of having smaller engines.

Haha well certainly not simple mechanically but, it ALWAYS works! My Johnson 150 was mechanically trivial but reliability was a tad iffy and it kept requiring bits of work. Not to mention the 0.5 mpg equivalent on the boat it was on :P The little Tohatsu 30 is a beautiful piece, never let me...

I'm always talking about 4 stroke outboards as that's what I have, I'd never go back to 2-strokes after the simplicity of my Tohatsu :) I agree with you completely; I was going off Autotrader's figures for the 4.0 vs 4.6 which do indicate a slight improvement on the 4.6 and which I...

I think you're oversimplifying things a bit there for the real world as an engine's power curve usually isn't linear (eg with boats (can you tell I love boats :P ) the fuel burn per hour - which I think is a better measure than mpg as it's independent of hills and mass etc - is usually more than...

Are the ratios the same for the different boxes?

To be fair, the official figures do actual indicate a slight improvement on the 4.6. I'm still bemused though as this doesn't seem to work given the engineering but there we go :P This is a question that's puzzled me for years; I used to wonder how supercars had such poor economy even when...

So for the OP, it comes down to; Diesel with head V8 with heart You'll have to make the final choice! Best of luck :)

It's the same reason that mopeds aren't amazingly efficient; they weigh about 1/10 of a car, so given the linear relationship between force and acceleration they should use 1/10 of the fuel... but they still only manage ~75mpg because they're constantly being revved to very high levels beyond...