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| mattinker:
--- Quote from: awemawson on December 17, 2014, 01:02:20 PM ---Surely a simple solenoid holding the end of the spring in series with a bi-metallic strip. Hold solenoid in manually when starting, the generator will then continue holding it, and drop out on over heat. --- End quote --- I don't see it, the idea is that it cuts when over heating, this requires contacts that open over a certain temperature, they won't need holding as long as it's below a certain temperature. My proposition of a small motor that pulls the stop using a a link when a contact closes over a certain temperature (bi metal strip, small "klixon" type switch or simple cheap temp cut out switch.) does this without having to re-arm at start up! Regards; Matthew |
| PekkaNF:
Diesel may have a valve that is kept open (fuel flowing) when energized. When it is not energized, spring closes the plunger and fuel supply to the injection pump is cut. Therefore diesels tend to be either no electric power at all (and no such valve or means of operating it) or all the works, when it is no problem at all. The problem starts if you start picking features that don't lead to them naturally. Petrol engine has always the sparky parts....and needs a contact. What I have against wallwart and such that they are normal consumer products made to survive warranty period at most in cosy living room and therefore I would not trust them outside of the house on anything more demanding than entertainment. I don't see point of downgrading an emergency generator reliability. But this is my personal take and should not be taken as an offense. Pekka |
| awemawson:
As Pekka says, the fuel rack is pulled out to run and returns by spring to stop. My big new generator has a large solenoid doing exactly this, but is 12v off the starting system. I'm advocating a solenoid rated at whatever Steve's Lister clone provides (110?) so no extras bits other than the solenoid. This has the advantage that the system is 'tested' each time you start, so if the bi-metallic strip contacts have oxidised you know. If you rely on something working only in a (hopefully rare) fault situation it may or may not work ! I suppose it's my background supporting critical systems that makes me think this way :ddb: |
| mattinker:
--- Quote from: PekkaNF on December 18, 2014, 03:10:57 AM ---Diesel may have a valve that is kept open (fuel flowing) when energized. When it is not energized, spring closes the plunger and fuel supply to the injection pump is cut. Therefore diesels tend to be either no electric power at all (and no such valve or means of operating it) or all the works, when it is no problem at all. The problem starts if you start picking features that don't lead to them naturally. What I have against wallwart and such that they are normal consumer products made to survive warranty period at most in cosy living room and therefore I would not trust them outside of the house on anything more demanding than entertainment. I don't see point of downgrading an emergency generator reliability. But this is my personal take and should not be taken as an offense. Pekka --- End quote --- Steve's diesel engine doesn't have an electric stop (unless I've missed something!), which mean that the stop is mechanical therefore, the stop lever needs to be pulled in the event of overheating. This is why I proposed a simple electric motor screw set-up, simple to implicate on a purely mechanical engine! No offense taken! I'd just like to point out that problems of built in obsolescence don't really apply to backup generators as they don't run for many hours! Regards, Matthew |
| awemawson:
Photo attached of the fuel solenoid arrangement on my Lister. Steve's won't have the solenoid, but the arrangement of spring loaded fuel rack will be similar I suspect |
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