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Fiddling with fuel delivery


Lars L
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Clockwise (in) delivers more fuel, smoke and excitement. If you're going to deliver more fuel I'd take the time to advance the pump slightly too. If you're in search of power, I used a set of Peugeot XUD9 injector nozzles in my 2.5NAD - there's no auxillary hole for injection. It was a bit harder to start in cold weather so I machined the heater plugs back 3mm or so, which partly offset the problem. It flew... for a NAD.

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Answers flowing in when it gets dark... ;) Thanks!

Yes, I kinda figured that it should go in, just wanted to be assured. :unsure: I have started with half a turn today, so far no black clouds. More screwing tomorrow! :blink::)

Oh yes, I'm in search for a bit more oomph. Treated myself to a brand new Turner gas flowed head, see. And as this is supposed to get more air in, I also expect that more fuel is needed. Your tip about the injectors is interesting, do you know of a reason why these increase power? Apart from the fact that they do? :)

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Your tip about the injectors is interesting, do you know of a reason why these increase power? Apart from the fact that they do? :)

As I mentioned above, there's no auxiliary hole so 'more' fuel is effectively delivered through the main nozzle. The aux fuel sprays directly onto the heater plug for better cold-start performance, but is effectively wasted in normal operation because at speed there's limited turbulent air motion in the region it covers - it probably contributes to the smoke-limited torque limit of the engine. By removing the hole you may find problems in cold starting, hence the heater plug mods.

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