Re: What did you do to or for or with your Laverda today?

Think Mercedes ones fit.  Can just imagine the look on the parts guy's face though...
 
drikko said:
Indeed there is , thanks for that. Failing this it's time I visited Red anyway :)
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I have approx. 273 brass x 7mm exhaust nuts in stock, have them run off on the CNC
 
If you need one while out and about, you can get a blister pack of 7mm screws and nuts from Supercrapauto and there's one of them in any medium sized town. Failing that, BMW dealers as mentioned, and also they are apparently used commonly on bicycles so any of the recent proliferation of trendy treadly shops might get you going again.
When touring I generally at the very least carry a couple of M7's (and some cable ties) somewhere.
 
The supercrap auto suggestion is a get out of trouble measure, but convenient to know if you're on the road.  They are quite thin and plain steel with passivated zinc plate only.  Will get you home though!  The BMW nuts are flanged, copper coated and self locking - nice!  They are designed as exhaust manifold nuts, so possibly a better option again.  I a bunch of spares the last time I was buying beemer bits but have not tried them as yet.
 
drikko said:
So what's the theory on them being brass and some of mine have spring washers and some don't, should they?
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Brass for the anti-corrosion properties, the spring washer as a safety precaution.

Stainless in conjunction with Coppaslip will do nicely if the system is removed regularly (racers, etc).  Spring washers required as the gaskets will crush and loosen the nuts.  Could omit them if tightness is regularly checked.  Eventually, the gaskets won't give anymore and no further tightening will be required.

M7 is still widely used by european auto manufacturers, rarely find it on asian vehicles.

I use flanged, self-locking titanium nuts (Toyota F1 ex. manifold fixing), 9mm AF.  Nicer. :D

piet
 
I popped a much improved ignition system in from the Redax shed (very happy to hear the Monty barking away),


and popped some N2 into the Jota's tyres - i'm stunned at the improvement. Tyres for Bikes and there N2 ways  (bikebend)

Peter
 
So you can actually feel the difference with the Nitrogen, as I loss 3 or 4 psi between monthly rides its to hard for me to go there.
 
Laverdalothar said:
the average person doesn't.
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Lothar, you would not believe how 'down home' the operation is (https://www.google.com.au/maps/place/669+Cooroy-Noosa+Rd,+Tinbeerwah+QLD+4563/@-26.4014716,152.9637888,240m/data=!3m1!1e3!4m2!3m1!1s0x6b936686d23e7831:0x20171a3d49d9037b)h: you are nestled in a paddock with Cattle and Horses (i'll try and get some pictures for reference), one of our esteemed members looks after you and they just happened to score a stand alone n2 machine, it evacuates your tyre of O2 over three cycles and fills it to approx 98% N2 - its awesome, i'm still stunned that i could feel the difference in acceleration and ease of movement, the tyre profile holds a much better shape, i've not done any serious 'scratching' yet, but suspect that the it will hold a much better profile shape in the corners.

Peter
 
By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.
Seems a remarkable change in performance for 21% more nitrogen in the tyres.
I know race teams use nitrogen so there must be something in it.
 
I remain Sceptical

I don't understand why it would be any different. Are you sure you haven't just talked yourself into thinking it's better? A little bit of self-delusion does wonders for your confidence  :D

If you fill a tyre with nitrogen, and an identical tyre with dry air to the same pressure, I can't think of any practical physical test you could apply to the outside of the tyre to tell which is which.

The universal gas law is called universal for a reason. All gases behave the same way when compressed. Tyre flex is a function of tyre wall rigidity, not the inflation gas. Tyre will be the same shape. The road contact patch will be the same. The tyres will react pretty much the same way to temperature (difference in Cp netween O2 and N2 is marginal, and air is 78% N2 anyway).

I suspect that any marginal differences in performance might be more to do with the moisture content of normal air, which could either condense or evaporate (depending on temperature) and change the tyre pressure slightly, which is why I said "dry air" above.

I think the main reason it's used in aircraft and race cars is to prevent degradation of the tyre rubber from oxidation. Although I wouldn't have thought that would be an issue with race cars because the tyres don't last long enough to perish. I suspect the reason it's used in racing is because a nitrogen cylinder is a simple way to get a reliably dry gas at the trackside. Eliminating the moisture component ensures a repeatable setup.
 
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