Spyder restoration - long time coming

[WestonE]

With Guy on the C clip.

[peteracs]

Hi Guy/Eric

Good point and as I have enough to fit for the HPE will use them.

Peter

[Nigel]

Good point made by Guy. I hadn't considered
that aspect.

Nigel

[peteracs]

Hi

Back on the AFR system. I tidied up the wiring for the power to the box by adding some crimps and covers and stowed the excess wire so there was no rats nest. It is now semi permanent, but as the box is in the engine bay and not full weather proof, the box and sensor are going to be removed when I am not going to use them.I also really wanted to revisit the idle as it has never been good, even the MOT guy said it was running lean on idle, thankfully not anywhere else. Reading the thread from capriblu in the carb section I saw his 2l responded well to an increase in the primary idle jet, so I checked on the AFR and no matter what I did to adjust the idle mixture screw, it was still very lean. I then swapped the primary (50) and secondary (80) idle jets over as per capriblu as they are the only ones I have currently and retested. Result was I could adjust the idle mixture from lean to very rich and if I set it to around 13:1 the engine idled quite sweetly at 800 rpm which it had never been able to do before.

So next job was to order some jets (60, 65 and 70). Given this is a 1600 I surmised that 70 may be too much and going for as low a value as will give a decent ratio would be preferable especially as the idle jet also affects the main jet according to what I have read. Hopefully jets will be here next week.

Peter

[WestonE]

I wonder if this need for a re-jet is due to the very different petrol we have today. I do not mean just the ethanol. Fuel now looses its octane explosive rating fast for example.

[peteracs]

Hi Eric

I would guess there is every possibility, though I find it odd that apart from idle the AFR readings are as I think you would expect, though I have no experience of tuning, just what I have read.

Anyway new jets arrived (Eurocarb recommended) tried .60 and adjustment at idle you had to wind out the adjuster all the way to get a decent rich reading, so installed .65 and this seemed to give good adjustment both rich and weak. Went for a quick blast and AFR readings on running appear to be richer than with .5 which was expected, but engine response was excellent, subjectively felt more responsive, but may just be me hoping! On return took one plug out and it had nice brown colour, so definitely not running rich. Will be parking my playing for now and get back on the HPE…..