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

http://auto.howstuffworks.com/question594.htm

http://www.popularmechanics.com/cars/how-to/a3894/4302788/

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=191

And from Epicenter Design LLC
"Since air contains 78% nitrogen, it has been argued that pure nitrogen has little, if any, advantage over air. However, this argument assumes that the compressed air in our tires is free of moisture, but it is not, as evidenced by the water and oil that must be drained from a compressor's tank. This is of particular importance because as we put heat into a tire, the moisture in the compressed air will cause the air in the tire to expand at a faster rate than a dry gas. Furthermore, water vapor causes the air to expand in a non-linear fashion based on the amount of vapor present, which is usually unknown.  Since processed nitrogen is a dry gas, there is no moisture.  So, while inflation pressure will still increase with tire temperature, the absence of moisture means there will be less increase in pressure and the increase will be consistent."
 
walkermarra said:
Is the the 3into1 going on or coming off, What make is it it looks very neat
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... the 3-1 is coming off, but I keep the 40mm header pipes. Former owner lost the Austrian registration papers. So I have to make a new "Oldtimer-Typenschein" and therefore the bike should be near to original condition. As far as I know the 3-1 was bought at Guiseppe Andrighettos shop/Maragnole-Breganze. Ciao, Gert
 
Rode the SF2 into work. Lovely day for it but too many idiots in cars.
Probably one of my last daily rides on the old girl.
My new Aprilia is in the shop just waiting for its number plate.

Paul
 
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.[/colour


I raced Single Seaters, Sports Prototypes and GT1 cars for 18 years and we used nitrogen in the tyres.
The reason was that if you set your four tyres at a pressure it would stay that way even when they wen through a heat cycle on track. Our Prototype's tyres, anti clockwise from the right front, would be set 15, 16, 16 and 17psi on a clockwise circuit.

Robin.  8)
 
Asked a guy that rebuilds off-road shocks why they used to use air and now use nitrogen for charging chambers.
Here's an answer to a question I regret asking.
http://www.getnitrogen.org/pdf/graham.pdf
 
This is to do with the bladder that separates the oil from the gas in expensive shocks and why they recommend servicing them at lest one a year.Less expensive shocks don't have this blader, Well thats what I have heard,
 
sonicboom500 said:
Asked a guy that rebuilds off-road shocks why they used to use air and now use nitrogen for charging chambers.
Here's an answer to a question I regret asking.
http://www.getnitrogen.org/pdf/graham.pdf
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Thanks sonic. That was an interesting read. Probably the best answer on this topic I've seen.
I'm now a wee bit better educated than I was 15 minutes ago  :D
 
Jotaman said:
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
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Peter, I don't say it can't be one or that it does not have an effect. I just commented on the post before my post that this is surely only something for - say - maybe 3-5% of all Laverda-riders, not for the average...
 
Vince said:
This is to do with the bladder that separates the oil from the gas in expensive shocks and why they recommend servicing them at lest one a year.Less expensive shocks don't have this blader, Well thats what I have heard,
Click to expand...

in the oilfield we have Pulsation Dampeners on the Mud Pumps and most are rated to 10,000 psi and above, consist of an oil filled cavity with a bladder filled with Nitrogen
been a number of cases where crews have filled them with Oxygen and the result is a massive explosion and lots of dead workers
not a good mix at all

 
in the oilfield we have Pulsation Dampeners on the Mud Pumps and most are rated to 10,000 psi and above, consist of an oil filled cavity with a bladder filled with Nitrogen
been a number of cases where crews have filled them with Oxygen and the result is a massive explosion and lots of dead workers
not a good mix at all
[/quote]
We use nitrogen charged bladders to help overcome system pressure drop when rams fit valve seats into heads in work (4 seats at a time).  They occasionally need charging up and I will be letting someone else do it in future ;-)
 
Hey Cam, sorry to come across as the giddy school girl, yes the difference is minor - but i was just stunned that there was any noticeable difference.
Part of my overt enthusiasm is that i've got the Montjuic running :)

Excuse the mic reverb and the lack of editing, fashion sense yadda yadda : https://youtu.be/C0Nv02fcmLc


 
Made and fitted a set of paddock stand bobbins to the RGS-based race bike. Had to make some threaded sockets and weld them to the underside of the swing arm. Job turned out neat enough.

Hey PC, that Monty is a noisy bugger. I like a loud bike  :D

I see you have the usual Laverda style rubber mounting for the exhaust can. Just be careful that you don't cook it.

I had the same setup on my RGS race bike (on the exhaust I bought from Bevelman). That rubber mount system seems adequate enough for road use, but during a dyno session on my race bike the rubber melted and the megaphone fell off. A dyno session is probably an extreme test for it because there's not much cooling air flowing over the back end of the bike.

I've gone to a solid mounting now. Well, solid-ish. It's bolted to a piece of springy flat bar about 75mm long so there's some scope for it to flex about. If the bar snaps from fatigue I'll try one of those laminated horn mounting strips if I can find a spare one. I've given up on the rubber. It's just not man enough for the exhaust temperature.

 

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sorted out Road Worthy Certificates for the Mk3 Motodd and the Twisted Monty today, both get registered next week
both looking good

 
Started up the RGS for the first time since the end of September (?) -just to check that the pistons were where I left them you understand.  Fired right up (why wouldn't it?), all seems good, everything works.  Would have been nice to be out today, but no tax and I'm diseased...  It'll need new shocks and a PC625 Odyssey sooner rather than later though.
 
An early ride up to the teahouse with SeFFie.  Low misty clouds heading up over the top. Magic!
Had a cuppa and a bit of brekky with lucky Levo before heading back down to be back home by 0900.  Noice.
IMG_2183_01.jpg

SeFFie attracted plenty of interest, as usual, but not by The Law fortunately.

& lucky Levo departs using Drikko's front brake lines.  yea, it's just another lucky story.  :o
IMG_2176_01.jpg


Was 3 Laverda's up at the teahouse early. Was a very low mileage '98 750S Zaney,  Paul? can't recall. Not had it that long. Said he thought he'd be the only Laverda up there,,  but hello.  No, this time i spared telling him about any Zaney stories.  Maybe he's already been talking with elPrez Cosi? anyhow, he gets the CLQ newsletter through the Guzzi club.
 
Took the RGS Mongrel race bike to Baskerville Raceway (southern Tassie) for a track day. It was the bike's first track outing, so a bit of an occasion. It was going great until the ignition rotor chucked a magnet off. Just like hitting the kill switch, only I couldn't switch it back on so it put an end to proceedings for the day.

Red builds a sweet engine. It has heaps of grunt and loves to rev. According to the dyno, maximum power is 7500 but I was hitting the 9000 rev limiter on occasions, and it feels like it wants to keep going beyond that. I don't wanna bust the engine so it's a good thing it's limited to 9K. The shift light was set at 5k for the initial run-in and I forgot to change it before the track day so it wasn't much use (was lit up most of the time). I'll re-set it to come on at 8k which will hopefully remind me to change up a bit earlier than 9k.

Apart from the minor hiccup with the ignition I'm really happy with the bike.

Looking forward to Broadford  :D
 
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