Lord Gruntfuttock

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Lord Gruntfuttock last won the day on January 14

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About Lord Gruntfuttock

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    official OS sex pest

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  • Gender
    Male
  • Interests
    Driving the wife mad by buying projects and tinkering in the shed at 5am...

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  • Local Area
    Southland

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  1. Lord Gruntfuttock
    Yeah apparently a bunch of Japanese rims were shithouse in the 80's. A few people have found similar horror stories when they went to change tyres...
  2. Lord Gruntfuttock
    Since I had the wheel apart I thought I'd paint a bunch of stuff... Stripped old bits... And sprayed with Durepox primer, a mix of grey/black depending on the final colour, when they chip the undercoat of epoxy should be similar in colour... And just top coated with VHT wheel paint. Will be interested to see how this goes... Brake plate was quite pitted but seems sound, smoothed out quite well with few coats of primer and paint... And spokes look as good as possible I guess, seeing it's only silver paint... And lower triple clamp looks pretty sharp. Had some drips on this from spraying too heavy but wiped them smooth and the wheel paint seemed to recover itself... Sort of waiting on Ali new rear rim to arrive now to give me some enthusiasm to start rebuilding shit, paint will harden in the meantime...
  3. Lord Gruntfuttock
    Nothing to lose so had a crack at it, remembered to measure offset beforehand., just with a ruler from a flat surface.. And a combination of heat, penetrant impact gun and force got them moving... Until I broke my favourite old spoke tool, was a bloody good one too... So out with the vice grips for the last few stuck nipples... And success. All spokes out without breakages. Should be able to clean them up and re-use with new nipples on a new 32 hole rim... Pretty pleased with that as I've already bought bearings etc for this hub...
  4. Lord Gruntfuttock
    Tidied the garage in the weekend and thought it'd be good to start putting this back together. The rear wheel looked ok, so I thought it'd be a simple cleanup and new tyre job, but oh no, nothing's simple. First mission was getting the ancient tyre off, was a real mission as was hard as fuck, so cut the sidewalls with a hook blade Stanley knife, removed the tread and tube, and levered off the remaining bands... And the obvious signs of corrosion worried me under what looked like orange insulation tape... And yep, disturbingly shitty... Wire brush on the drill appeared to clean it up ok, and at this stage was still hopeful it was recoverable... But serious cracks mean otherwise... So thought I'd just lace up a new rim, fairly standard size so should be no probs... Except it has some weird spokes that go right through the hub on one side. Never seen them before... Turns out they're Z-spokes, an innovation Yamaha brought out in '84... And discontinued cos they were a bit shit... So that's where I'm at. You can get new spokes, but they're stupidly expensive. Annoying as I thought this wheel was ok and just needed some paint. So can either clean it up and use with cracks, or look at other wheels/hubs that'll work... Will see what looks similar/is available...
  5. Lord Gruntfuttock
    Seat build info down near bottom of this if you want pics. Seat still going well several years later...
  6. Lord Gruntfuttock
    I just used sleeping mat foam from the warehouse. Closed cell so waterproof, can glue together and is sandable for shaping. Cos it's fairly hard I added a gel pad on seat section, and covered the lot in smoothing foam to even out before it went to upholsterer...
  7. Lord Gruntfuttock
    SCIENCE!!! I so want to graph that...
  8. Lord Gruntfuttock
    Shit that's cool. heaps of room for big batt pack, efficient frame mounted motor, big wheels, discs etc. and a stubby holder.... And yeah definitely a learning curve. I'm thinking of doing a classic electric scooter down the track, an old Tigress or BSA Sunbeam. Reckon putting batteries where the engine was and a grunty hub motor would be a hoot...
  9. Lord Gruntfuttock
    And just ordered this one, which should do the job...
  10. Lord Gruntfuttock
    Yeah I cheaped out and my $7 BMS doesn't have balance function, which would explain it...
  11. Lord Gruntfuttock
    So had charger on for days and it is VERY slowly raising the voltages, but I'm still not convinced the BMS is actually doing any balancing? Trend shows very gradual increase overall, but no obvious evening out across the 10 parallel banks... So I soldered a few 21W 12V lamps to connectors so I could drain some cells. Started with 2 lamps in parallel on each of the two cell blocks that were over 4V (parallel banks 5 and 7). This drew just over an amp and I ran it till the cells were around 3.8V... Then connected 3 lamps in series across the whole battery to drop all cells down, and mowed the lawns... Started with 37.8V and 90-odd minutes later had dropped to 35.4V. Chucked it back on charge overnight, and things looked much more even, and overall voltage had increased from 38.6V to 40.2V... Different scale shows the improvement overall... Think I'll repeat the exercise, but still confused as to operation of BMS. Is it just because the imbalance was so large? Or does each cycle even things up. Just want to know if it's worth ordering/connecting another BMS before wrapping the battery up. I did buy a cheap one, and it doesn't actually mention balancing in the description... [Edit] just ordered a flasher looking one anyway. Reviews, specs seem ok...
  12. Lord Gruntfuttock
    Harleys can lean...?
  13. Lord Gruntfuttock
    Beauty, cheers for that...
  14. Lord Gruntfuttock
    Was just going by the LED on the charger, went from red to green, indicating fully charged. It's just an Ali 36V 2A Li ion charger, suitable for 10S 10-15Ah Ebike batteries (output of 42V not connected). I did think it'd take a long time for cells to balance with those teeny wires, will leave it on overnight tonight to see how things go. Cheers...
  15. Lord Gruntfuttock
    More bits had arrived over xmas and I had a little time over the weekend so hooked up the BMS. Cut a bit of leftover foam from my tool trays as a mounting point, routed out a recess, and stuck it on with hot glue... And hooked up the power wires... Then ran the balance wiring, beauty of this kit is I can just remove the links to solder on the balance wires, so no heat issues... And tied it up. Paused at ths point as I wanted to check all was ok before taping up and heat sleeving the whole thing. And put it on charge... Aaaand I don't think it works...? Charger ran for 40 mins or so and switched off, overall voltage 38V, but checking shows a big variation between the parallel groups of cells (from 3.61 to 4.12V) I thought the BMS was supposed to balance these things out by levelling cell voltages via electronic switching/shunt resistors? Google tells me that "with a BMS, balancing is handled by the BMS, not the charger. So when the first cell group reaches full, the BMS cuts off the charger and drains the highest cell group(s) slowly using its onboard resistors. Once its lower, it allows the charger to turn back on. It repeats until all cell groups are full." Maybe I didn't leave it on charge long enough? I'll leave it on for some time when I'm home again, but if that doesn't work I'm unsure where to go from here. BMS definitely wired correctly, it was only a $7 job though so might invest in another one and try again. Any experience/suggestions?