Easy answer - No ECU`s - No Immobilisers - No Complex electronics and an abundance of blocks for 50p
But even without them, reliability is stil lower (even when you add the electronics into the equation)
And rare these days to
If I'm tinkering with it (and surely you wouldn't leave a XFlow bog-standard?
) I'd rather have electronics than clockwork bits.
Carbs are a pain in the @rse to get running right after any tuning work (and require a drawer full of expensive chokes, jets, emulsion tubes, etc) whereas injection systems can be set up in an hour or two on the road with a laptop on the passenger seat.
You can make a car
so much more driveable with a mapped ignition system over a mechanical dizzy, especially if you're tuning it, and you'll end up with something more reliable than a dizzy and coil anyway.
Not much more you actually
need to make an engine run... Hardly complex IMHO.
You can bolt the above on to any engine from a scrappy that has a crank sensor easily enough, so why pick 1950's technology?
Now, if you're trying to retain the OEM ECU from a modern engine you will be giving yourself a headache, but for the cost of a megasquirt why would you?
I dumped my pair of 45DCOEs for a megasquirt injection setup 6 years ago and I literally haven't touched it since. Bear in mind this is a home made injection setup with home made ECU & loom, most parts salveaged from the scrappy (I did buy a pair of Jenvey TBs, although I was tempted to carve up some bike TBs).
Had I left the DCOEs on the car so many parts would have fallen off them by now that it wouldn't run let alone run well.
Kevin