Jonathan Kay
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Everything posted by Jonathan Kay
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Dodgy, or just run out of smoke? The refill kit isn't available any more. Jonathan
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If you want to start with testing the relay you could use a multimeter or bulb on a wire to see if the feed from the switch to the relay is going live when you switch the switch. Jonathan
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Assuming you've lost both dipped lights and you haven't played with anything nearby recently I'd suspect one of those switches, and would test it by bypassing the switches with some cable and seeing if the lights come on. Jonathan
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Thanks Jonathan
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That's interesting, Greg. I know very little about car radiators but I would have thought the heat transfer was mostly convective and would depend on airflow, surface area and conduction through the radiator. Copper conducts heat better than aluminium. Could the effect you have observed be due to aluminium allowing a better design? I found one article that suggests that: See discussion of tube sizes. If the radiators you compared were identical apart from material that couldn't be the reason. Thanks Jonathan Edited by - Jonathan Kay on 28 Sep 2011 14:15:47
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There's lots on this in the Forum, especially about removing air. I suggest you try searching, and then ask again if you need help. Good luck Jonathan
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Sorry about the finger, but at least they heal, unlike 7s. (Waiting to see if it goes away is often a good tactic in medicine, unlike engineering. Although there is a suggestion in another thread that it works for some gearbox seals.) Try a thinner/ different clip? Jonathan
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Sounds like the hose might not be fully on the pump? Agreed: you need to get enough hose beyond the clip: I don't think there is much technique other than that. Can we assume that everything is fully lubricated? Jonathan
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I use it in all my tyres at work. However, they are inflated to around 13.5 bar. Is the Wikipedia section on aircraft tyres accurate? Thanks Jonathan
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Can someone explain this idea that nitrogen expands less than air when it gets warm? Or is it really moisture in the air that nitrogen eliminates - or is it snake oil? There is a genuine effect of not having the water there. That's why they use nitrogen in aircraft tyres. As far as I can tell from then on the logic fails when the effect is attributed to the presence of nitrogen/ lack of oxygen rather than the absence of water. Mostly snake oil for most car uses. Jonathan
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pressurised to 1 barg it will be 56g I thought that was a typo, but now I know all about gauge pressure Thanks Jonathan
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I've been trying to work out why this is promoted... the additional profit from the inflation with nitrogen must be tiny. The interweb came up with one suggestion: you get the first inflation, then you feel you have to take it back to the first place fro the top-up, then when you need new tyres you naturally go back to the same place. Unless you can think of anything more plausible... Jonathan
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I got mine from Classic Silicone Hoses. Recommended Jonathan
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I think that filling car tyres with nitrogen is mostly a fashion issue, but 1 The reduced water content is a genuine reason for its use in aircraft. It seems to be cheaper to buy nitrogen, which is inherently dry, than to dry compressed air. 2 The reduced water content may be a genuine reason in some very critical applications that need controllable pressure-temperature-volume relations, such as Formula 1 tyres 3 The absence of oxygen and reduced risk of fire is a genuine reason for using it in the late Space Shuttle. 4 The diffusion argument is guff. 5 The inertness protecting your wheels argument is guff. Jonathan Edited by - Jonathan Kay on 24 Aug 2011 13:14:49 Edited by - Jonathan Kay on 24 Aug 2011 19:41:04
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"The alternator just transfer the mechanical energy from the built to electrical energy. And even with the assumption the alternator needs to do more work when the lights/heater are on, how come this extra work is taken from the engine/petrol despite no changes in the rpm....." You're right... the alternator has to work harder to deliver more electrical power... if it's at constant RPM then the mechanical load back through the belt is higher, and the engine burns more petrol to deliver that extra torque to turn the pulley. But I have no idea how much power it takes to spin an unloaded alternator and belt and pulley(s) compared to the electrical power it can generate when loaded... does anyone know? Jonathan
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I now have a quote for making these. 12 off in stainless steel for £30. Anyone interested? Jonathan
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How I easily improved the appearance of my garage doors
Jonathan Kay replied to millsn's topic in TechTalk
"Googlewhack" Jonathan -
Thanks. So did I. Unfortunately the thin section on the ones I got from Prima was slightly too short so the belts won't swivel. Jonathan
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I'm getting a quote for having some top hat/ spacer washers made. Does anyone else need some? Jonathan
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Yes, there's lots on this recently. Frank Pickles seem to come out the cheapest for many people. http://www.frankpickles.co.uk/ Jonathan
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It's normal. You activate/ deactivate the intermittent wipe by turning them on and off within a few seconds. This caused me a lot of confusion during the build. The good point is that saves a switch, but it's a very bad piece of design because you can't tell what mode you're in. Jonathan
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I don't understand "In the Office"... could you explain? Thanks Jonathan
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One has just appeared in my drive... Width 1645 mm across fattest part of front tyres. A bit less at the back. 3090 mm from front of the car to the center of the rear wheel. Jonathan
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I never found a source for the top hat/ spacer washers... any ideas? The anchor plates are 3.98mm thick. Does anyone know a source for the top hat washers so that I can try and find some with a longer thin bit? Thanks Jonathan
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You could look at Titon harnesses: http://www.primamotorsport.com/ They make them either handed and to tighten either way. Jonathan
