Jonathan Kay
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Everything posted by Jonathan Kay
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I've just tried to reply to that Private Mail but got an error message. I've told Shaun. Jonathan
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I've tried to send you a Private Mail but the system says there's a problem. I have the 2012 and 2014 Assembly Guides but the wiring diagrams in those cover "Sigma" and R400". And all the ones I've seen from that era are highly schematic. Have you checked the Caterham site? Does anyone have anything better? T6 pinouts. Jonathan
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Yes. Are the two defects the same? Jonathan
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Did you see that Abbot's is also in France? :-) Please tell us everything you can about your model and spec, date, engine and ECU, and we'll see what diagrams are available. Jonathan
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This is the thread I remembered. Jonathan
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Wasn't there something similar recently? Jonathan
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I suppose if once it fails it usualy takes 5 or 6 attempts you could carry a chunky battery in boot, fully charged, next time it happens jump from battery and see if it fires first time, kinda of down to desperation ideas now, How about one of those lithium cell starter things? Jonathan
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Yes, that confuses it, but I think it might still pin it down. The power of the method also depends on the failure (to start) rate. If that's low it's much harder to know what's causing what. But who am I telling about intermittent faults? ;-) The thing that would really help is an external power supply to the ECU that doesn't drop its voltage with cranking. An external battery and bit of temporary wiring could provide that. But if the ECU is immune anyway as simon_h says that line is irrelevant... if we were measuring at the ECU rather than the battery. I don't that think the drop on that circuit would be that high without an awful connection, and Expat's going to check those already. Jonathan
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That's a strange article. It's got some good practical points but a lot of the physics is simply wrong or garbled. The approach to units is a bit unusual but that's not too surprising as it uses a mix of systems and tries to stay with "horsepower" to make it accessible. (And although removing mass from the centre of a crankshaft will have less effect on the moment than removing it further out it may be sensible in terms of optimising strength or stiffness against mass.) Less reciprocating mass means less energy wasted accelerating engine components... Changing the mass or moment of a symmetrical flywheel doesn't reduce the reciprocating mass, but it does make it easier to accelerate the engine. Jonathan
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Only problem that I'm aware of is failure to start on some occasions. Does it crank at normal speed and not fire or does it not crank? 2/. Battery is new. Banner 12 V, 30 Ah, 300 A. What sort of voltages should be expected from this battery? Lots of sources say minimum of 9.6V while cranking. But there's a problem on some 7s of the ECU dropping out and cuttting the ignition even though there's enough oomph to spin the engine at what sounds like adequate speed. Using an additional external source means that the voltage won't drop so much at the same current. That's why I try to persuade everyone to get more data on this... Jonathan
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Well done. Jonathan
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Well done. Recommended cheap calipers, the identical model is available from lots of different sources. http://ecx.images-amazon.com/images/I/41hNZz-ejKL._SY355_.jpg And the little knurled knob rarely survives encounter with the enemy. Jonathan
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I'd inspect and clean all the relevant connections, both live and earths, as you say. But with those symptoms and that cranking voltage I'd also experiment with a series of starts with and without an external battery. Ideally that would be a jump start with the donor vehicle running at 3,000 rpm. A randomised sequence would be good but alternating will probably be easier. Does it make the starting reliable and what's the cranking voltage? Jonathan
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Cranking – 9.6 V Some ECUs will drop out at that sort of voltage... is the residual problem still unreliable starting and nothing else? Jonathan
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Thanks. That getting warm idea has never sounded likely to me but he's a professional and it does fit your story very well, and Tim thought of it in post #6... so I guess it now has to go in the bag of tricks. Jonathan
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Well done. How did you track it down... persistent inspection? Jonathan
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HPK: Oh, yes. Engine braking: Thanks, Roger, I think I've got my mind round it now. I couldn't work out why lower rotational intertia would cause greater retardation. But I had the wrong mental model: at a given rate of retardation from air pumping then lower rotational inertia in the drivetrain results in greater deceleration of the whole vehicle. I was thinking of "engine braking" as describing the torque rather than the deceleration caused by the torque. Jonathan
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Eastwood Dual Voltage Powder Coating Gun - A bit of a review
Jonathan Kay replied to Titanium7's topic in TechTalk
Thanks... are you thinking of offering a service? :-) Jonathan -
Eastwood Dual Voltage Powder Coating Gun - A bit of a review
Jonathan Kay replied to Titanium7's topic in TechTalk
How much, please? Jonathan -
Why would a lighter flywheel give you more engine braking? Thanks Jonathan
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Back to basics: Can you post a photo of the lever? Are you sure there isn't an extension piece? What's the outside diameter of the shank just below the thread? Can you post a photo of the thread as close as possible to that of a known bolt?Or the fancy way: Bolt and Nut for iOS. Jonathan PS: Did you take the lever or the knob?
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Sorry to hear that. Do you want to upgrade when you have the repairs done? I took mine to Rat Race and was very happy with the work. We had a long discussion about options before I committed. Jonathan
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Look forward to hearing what you discover working through those tests. The point about Easy Start is that it shoots an easily ignitable gas into the intake, and if it then fires it suggests the problem was fuel starvation. In your situation that could be caused by several different things, including the immobiliser. I think that's worth doing. (I'd only recommend using this for diagnosis, never for repeatedly starting "difficult" engines, unless you know what you're doing.) You're going to measure the cranking voltage, and I'd also have another go at the same thing by trying to jump start it off another car running at 3,000 rpm. Jonathan PS: The last leg of our bike trip is Moustiers to St Raphael, but I'll only have bike tools! :-)
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Which LSD? There's an enormous amount of discussion in the archives about suitable lubricants, and, if I understand it, no consensus. You could start here, which is quite recent. Jonathan
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Sorry, no personal experience*. The big boys who do my CBTs all wear them, but I don't even know if they are part of the gauntlets or inners. And bikers' hands don't move around as much as drivers'. Jonathan * Well, not since 1975. I spent a year in a laboratory where we used to cook people in heated suits to see how it affected breathing. It's surprisingly hard to raise an adult's core temperature.
