Engine Speed Limiter
Posted: Mon Dec 26, 2022 20:23
I'm a bit confused here...
I had always understood that the electronic thingummy just to the rear of the AB14 ignition module was the rev limiter:
But there's another box, mounted to the same inner wing further forward, just behind/below the piping to the air box. This actually says "SPEED LIMITER" on it, as shown below:
So what gives? Are they both rev limiters? Or is the box next to the AB14 something else?
This is all cropping up because, a week before Christmas, the Lotus decided that sparking was no longer part of its repertoire, requiring an embarrassing 30 minutes tinkering in the Mercedes HPP carpark while my colleagues filed out, some offering help and others offering comments about the wisdom of using a 32-year-old Lotus as a daily driver in sub-zero temperatures in mid-December, followed by a call to my wife to come and collect me. By some miracle it suddenly decided to spring to life just as she was pulling into the car park, but since arriving back home has refused to even cough. Only today have I started to try and track down the cause of the lack-of-spark, with no success so far. I've tried unplugging one of these modules, then the other, then both, then plugging them back in again, no joy, so I doubt they are responsible, but it has made me curious as to what the actually are!
I had always understood that the electronic thingummy just to the rear of the AB14 ignition module was the rev limiter:
But there's another box, mounted to the same inner wing further forward, just behind/below the piping to the air box. This actually says "SPEED LIMITER" on it, as shown below:
So what gives? Are they both rev limiters? Or is the box next to the AB14 something else?
This is all cropping up because, a week before Christmas, the Lotus decided that sparking was no longer part of its repertoire, requiring an embarrassing 30 minutes tinkering in the Mercedes HPP carpark while my colleagues filed out, some offering help and others offering comments about the wisdom of using a 32-year-old Lotus as a daily driver in sub-zero temperatures in mid-December, followed by a call to my wife to come and collect me. By some miracle it suddenly decided to spring to life just as she was pulling into the car park, but since arriving back home has refused to even cough. Only today have I started to try and track down the cause of the lack-of-spark, with no success so far. I've tried unplugging one of these modules, then the other, then both, then plugging them back in again, no joy, so I doubt they are responsible, but it has made me curious as to what the actually are!