Jonathan Kay

... with the transmission puns? Thanks Jonathan

Were the old ones worn thin? Which tool are you using? Jonathan

Did it refit OK? Jonathan

Maybe we should have a "Not Spotted" section? We have! :-) Jonathan

You're right, sorry. I blame the wind at Hullavington today... If only we could do multiauthor wikis... Jonathan

Looking at the Meredith effect (incidentally, can't see why antifreeze makes any difference to the effect - and what about Evans!) I don't know why they wrote it as they did, but I'd make a guess that they knew about the fascinating and important history of cooling the Merlin in the Spitfire, and were thinking about evaporative cooling not beng used eventually. Typical current for a small cooling fan is 5A, say 60W, so maybe 100 to 200W for the whole circuit from alternator to fan. I can't find the the power needed to run an alternator (not the current generated), but it must be trivial compared to that needed to support typical electrical loads, and the system is very inefficient. Not powering the cooling fan or spinning the alternator will release some power that can get to the wheels, but avoiding electrical loads on the alternator is probably much more important. 2. Switch on the cooling fan. I don't understand this: more please. If you run your 7 with the cooling fan running (regardless of temperature), given that some/much/most of the air exits through the bonnet louvres, would that create any thrust effect? Nope. The power is too low and the airflow too disorganised. Getting any significant ram effect from the cooling system is very complicated. But has it been used in eg F1? Jonathan

Do you need any more on identifying the bolt or thread... or is it sorted? Jonathan

John: You're probably ahead of me on this but could you ask explicitly about hose compatibility as well as chemical composition? Thanks Jonathan

Thanks for those details. Jonathan

For all the basic maintenance jobs I recommend the advice with pictures from Alcester Racing 7s. Jonathan

The best guide I know is Alcester Racing 7s. AFAIK standard fronts are pushed back not wound back, and standard rears are wound back clockwise. Are there any systems on 7s that have pistons that are wound back counterclockwise? Please could you post the solution for AP fronts when you find it? Jonathan

I am sure that Honda have tested it and conclude that it's good enough for their needs. But they don't make any technical statement of any kind, let alone anything about superiority over alternatives. It's those unsupported claims about superiority to a mixture of water and ethylene gycol that I'm challenging. I don't understand motorsport but I'd also want to know who's paying whom in that deal. Jonathan PS: We already know the boiling point of propylene glycol. It's the relevance that's under debate. PPS: I'd also be happy to use it my 7. But as it has an aluminium block I'd still change it frequently.

That press release contains statements from Evans and Honda. The Evans statement includes: "Evans’ Power Cool 180, which is the choice coolant of the team, contains no water and offers an increase in performance, low pressurisation, no corrosion to engine components and eliminates boilover with a boiling point of over 180°C. The team is looking forward to working with Evans throughout the season and putting the company’s products to the ultimate test with the factory CRF450R, while aiming for victory in the MX1 World Championship series." Is there any available evidence of increased performance in any setting, absence of corrosion or reduced pressure in the cooling liquid from either Evans or any other study? If I were selling this I'd get all of those studied by an independent lab and publish the findings. Please consider the flammability before you boil it (or ethylene glycol) in a home-made set-up. Jonathan

Roger has apologised. And his comment was uncharacteristic. Please let it go. Jonathan

Suggestion here that they're M10. I use this app for unknown nuts and bolts. You're right: sort it, don't force it. Jonathan

China, apparently. :-) (I don't think this is, BTW, but I do think that supporters are making claims way beyond the limited evidence available from the supplier or other sources.) Jonathan

The cooling system of the Hurricane provided additional thrust... I wonder if ACBC ever thought about that... Jonathan

Try this great guide from Ian B. (It took me three attempts the first time but it does work.) Jonathan

I would post a photograph----but can't discover how to. I will email photgraphs when requested!! Do you want to put them on a server and link to them, or upload directly them from your computer: the new site supports both. Jonathan

Good try, John. But I'm not holding my breath. Jonathan

Martin's rabbit will need a new home when the curtains arrive... Jonathan

Don't worrry about the first hole: you can get nice-looking washers that are bigger than the mount... just put one at each end and it will look as if it were designed that way. Jonathan

:-) Jonathan

But back to my header "water pump flow rates" I asked this as one of the blokes I work with is ex motor trade, he knew of various Holden (Aussie Vauxhaul) engines where the coolant was pumped around at such a rate it wasn't in the rad long enough to lose heat effectively, got me wondering if something similar is happening here. I think that heat transfer in a conventional set-up always improves with higher flow. (And that you can show it with a thought experiment... ) I wonder if what they had observed was something to do with controlling pressure with orifices and the presence or absence of a thermostat. Jonathan PS: What OliverSedlacek says.

Have you made any changes to anything recently? What's the battery voltage at rest and as you try to start? Jonathan