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!
Engine Speed Limiter
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- rbgosling
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Engine Speed Limiter
"Farmer" Richard
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
- Hawaiis0
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Re: Engine Speed Limiter
Something else. The lower one is the real item
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- Alan_M
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Re: Engine Speed Limiter
I think the one next to the AB14 has something to do with controlling idle speed - does your car have a throttle jack solenoid on end of carbs?
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Re: Engine Speed Limiter
First connect a decent bulb to the ignition coil to verfy you've got power while cranking. Uneven wear on the contacts on the switch can cause the contact to lift in the crank position. Sometimes the car will then fire when you give up and let go of the key
Re: Engine Speed Limiter
I think it is the speed sensing relay. not sure where it gets its signal from.
I REALISED YOU CANT LIVE WITHOUT A LOTUS!!! Until now
- rbgosling
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Re: Engine Speed Limiter
I think Alan's right - it controls the throttle jack solonoid. That seems consistent with the wiring diagram too.
"Farmer" Richard
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
- Alan_M
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Re: Engine Speed Limiter
Part number is A910E6757F described as Relay, rpm sensing (throttle Jack) in parts catalogue.
Alternative number is Bosch 0280230103. These are obsolete very hard to find. Or they were when trying to get one last year for mine. They were used for Bosch jetronic fuel injection systems.
Re: Engine Speed Limiter
Hello,
Long time lurker here
Not a reply to the post exactly. I have the Engine Speed Limiter, but no Throttle Jack fitted to my 912HC engine,
Is any one able to tell me anything about the solenoid - make. model number,specification etc so that I can source one or its equivalent.
Also details of how it is fitted to the engine block / carburetor idle spindle would also be welcomed
Thanks
Brian
Long time lurker here
Not a reply to the post exactly. I have the Engine Speed Limiter, but no Throttle Jack fitted to my 912HC engine,
Is any one able to tell me anything about the solenoid - make. model number,specification etc so that I can source one or its equivalent.
Also details of how it is fitted to the engine block / carburetor idle spindle would also be welcomed
Thanks
Brian
- rbgosling
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- Model: Lotus Excel SE
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Re: Engine Speed Limiter
It's mounted at the front end of the forward carburettor. No idea what make/model it is, if there ever was a sticker on mine it fell off a couple of decades ago, but the Lotus part number is B910E9030J. If you have access to the parts list, it's 040 on page 42.03a – Carburettor Assembly, which also shows the lever it pushes on to control the throttle. I'm sure Lotusbits will have a few old ones knocking about if you want to fit it. I might be able to get a photo for you later, if I remember...
"Farmer" Richard
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
1990 Lotus Excel SE (Lilith)
2022 MG MG5 EV (not due to be a classic for quite a few years...)
2011 Nissan Leaf (Ragly - EV pioneer, must be due to be a classic one day)
- Alan_M
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Re: Engine Speed Limiter
You don’t say if your car is auto or manual as I believe if an auto they didn’t have one fitted.Grizzly wrote: ↑Fri Jan 20, 2023 16:13Hello,
Long time lurker here
Not a reply to the post exactly. I have the Engine Speed Limiter, but no Throttle Jack fitted to my 912HC engine,
Is any one able to tell me anything about the solenoid - make. model number,specification etc so that I can source one or its equivalent.
Also details of how it is fitted to the engine block / carburetor idle spindle would also be welcomed
Thanks
Brian
- Hawaiis0
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Re: Engine Speed Limiter
Thank you Gentlemen for your replies.
My car is an SE, so therefore manual
I have the parts catalogue so know what I am looking for. HawaiisO has pointed me in the direction of SJSportscars so will try them tomorrow.
Thanks
Brian
My car is an SE, so therefore manual
I have the parts catalogue so know what I am looking for. HawaiisO has pointed me in the direction of SJSportscars so will try them tomorrow.
Thanks
Brian