Author Topic: The Worlds Fastest NIMBUS  (Read 78820 times)

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Offline 55chevr

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Re: The Worlds Fastest NIMBUS
« Reply #90 on: November 22, 2014, 09:09:02 PM »
Ahhhh Harley Sportster forks. My favorites. Good choice --- Lots of years with interchangeability and parts readily available.  Now it can go fast.


Joe

Offline wobblywalrus

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Re: The Worlds Fastest NIMBUS
« Reply #91 on: November 23, 2014, 11:54:28 AM »
Lars, there is a relatively inexpensive modification to those Showa forks that in improves them for race use.  In a couple of weeks I will be doing it on the street bike and I will post it on the build diary.  It is simply installing some inertially actuated blow off valves.  It allows the forks to quickly compress and absorb energy if you hit a rough patch on the salt.  There is less of the big jolt to the chassis that can cause stability problems.

Offline nanno

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Re: The Worlds Fastest NIMBUS
« Reply #92 on: November 24, 2014, 04:31:12 PM »
The exhaust looks downright awesome!

(The rest ain't too bad either  :-D )

Cheers,
Greg

Offline octane

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Re: The Worlds Fastest NIMBUS
« Reply #93 on: May 10, 2015, 02:07:10 PM »
Howdy !
Hope you're all doing well and is getting ready for August.

Progress report from this side of the pond , the short version:

Essensially started ALL over again with the 'rebuild' engine.
Didn'tlike what I saw inside of it.
Got a BRAND NEW NOS crank/con-rod assembly.
That is harder to find than a full set of hens teeth in a very big haystack
( or something )






..and better quality main bearings



Puzzle for big boys



..worked over and flattened every single surface that 'mates' to other stuff



..got hold of all the parts for the rear-assembly, brakes , drive etc



..and fixed them up



..and painted



...now, that's better



..yet another puzzle for big boys



..got the camshaft back from the local machinist. 'Extended a couple of inches



...that will hold the blower-pully



.. he also made a 'lid' with an oil-seal from where the extension will pass through



...fixing up stuff, gear-change mechanism, modified ignition system etc.



..ripped the old ignition-coil out of the housing and inserted a ned HT lead connection.
Will now run a normal hi-performance ignition-coil mounted on the frame



...loads of paintwork to do



..tank with new filler-thingy almost ready



.. lots of repair, modifying and paintwork on the fairing



.. got an AKRONT rim for the rear-wheel off German Ebay



.. and laced it up with custom-made spokes



.. lend orginal Nimbus tools for setting up the drive crown/pinion gear



.. tricky and timeconsuming shim set-up



..had a bunch of things laser-cut: engine mounts, rear-wheel / drive mounts and a kick-starter



..time to tack the frame together properly with help from a guy smarter than me.
Welded the frame to the table



.. made spacers and stuff to keep everything in right position



...enden up looking hilarious, but it worked pretty well



..and it kind'a looks like a frame. Still only tacked together



..setting up blower



..made new intake-system



..made a photo session mostly to brag about probably being the only guy in the
world with 3 supercharged old motorcycles



..smoooooth ,ain't it ?!



..2300 cc of supercharged goodies



..had the crankshaft checked in this fine piece of equipment ( not my crank in the photo )



..to see how well it was balanced. Big surprice: maximum out-of-balance at 1200RPM
was 1.5 gram (0,0529 ounces) , dropping up the range to 0.8 gram (0,0282 ounces)
That is like nothing. A brand new car-crank is around 3-4 grams



..finished the zoomies with metal inserts to fit it up to the cylinder-head



..and it was time to get the engine together again / again / again


...setting up crank-shaft / clutch



..I love this part



..never done an engine this way, but that's how to do a Nimbus



Borrowed an electric-driven run-in table from a Nimbus workshop.
8 hours of running it, just like they did with every single engine at the factory back in the days

http://youtu.be/JGh6893rjrk

..I sat it up so it sucked the oil-mist out and into the intake to lube things up



..changed the oil a couple of times and it contained no nasty surprises



Time to get this thing running !!!
Yesterday was my birthday and an appropiate occation to bring ”Odin's Fury”
to life :

Click and turn UP sound :

https://youtu.be/taE7l68DcRo



Yeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeah !!!
« Last Edit: May 10, 2015, 02:21:50 PM by octane »
"A designer knows he has achieved perfection
not when there is nothing left to add
but when there is nothing left to take away"

Antoine de Saint-Exupery

Offline Glen

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Re: The Worlds Fastest NIMBUS
« Reply #94 on: May 10, 2015, 03:24:08 PM »
Lar's it looks great and the sound is awesome. Nice work.  :cheers:
Glen
Crew on Turbinator II

South West, Utah

Offline bak189

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Re: The Worlds Fastest NIMBUS
« Reply #95 on: May 10, 2015, 03:32:44 PM »
Hey, Lars seeing the bike uses a drive shaft.....what are you using for gear ratios??????
Question authority.....always

Offline Peter Jack

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Re: The Worlds Fastest NIMBUS
« Reply #96 on: May 10, 2015, 04:29:12 PM »
Lars, you've done it again sir, beautiful build!  :cheers: :cheers: :cheers:

Pete

Offline Old Scrambler

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Re: The Worlds Fastest NIMBUS
« Reply #97 on: May 10, 2015, 07:47:51 PM »
Odin should be pleased :-) :-) :-) :-) :-) :cheers:
2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2018 AMA Record - 750cc M-CG HONDA CB750 sohc - 136.6 mph
2018 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 143.005 mph
2018 AMA Record - 750cc M-CF HONDA CB750 sohc - 139.85 mph
2018 AMA Record - 750cc MPS-CF HONDA CB750 sohc - 144.2025 mph

Chassis Builder / Tuner: Dave Murre

Offline tauruck

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Re: The Worlds Fastest NIMBUS
« Reply #98 on: May 10, 2015, 10:42:46 PM »
Awesome build Lars. Much attention to detail. :cheers:

Offline sofadriver

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Re: The Worlds Fastest NIMBUS
« Reply #99 on: May 11, 2015, 12:43:32 AM »
DAYUUM !!!!!!!!
Mike in Tacoma

"aww, what the hell - let's just do it".............

Bike #833
100cc A/G, A/F and APS/G (in 2019)

Offline sabat

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Re: The Worlds Fastest NIMBUS
« Reply #100 on: May 11, 2015, 11:16:52 AM »
Amazing work, absolutely beautiful bike !!    :cheers:

Offline mtkawboy

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Re: The Worlds Fastest NIMBUS
« Reply #101 on: May 11, 2015, 04:21:50 PM »
A work of art, just beautiful

Offline saltwheels262

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Re: The Worlds Fastest NIMBUS
« Reply #102 on: May 11, 2015, 06:36:41 PM »
very nice, Lars.
the big end on the con rod sure is beefy .

Franey
bub '07 - 140.293 a/pg   120" crate street mill  
bub '10 - 158.100  sweetooth gear
lta  7/11 -163.389  7/17/11; 3 run avg.-162.450
ohio -    - 185.076 w/#684      
lta 8/14  - 169.xxx. w/sw2           
'16 -- 0 runs ; 0 events

" it's not as easy as it looks. "
                            - franey  8/2007

Offline Glen

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Re: The Worlds Fastest NIMBUS
« Reply #103 on: May 11, 2015, 09:16:28 PM »
Lar's you have sure put in many hours for this super build, I am very impressed with your work. You have to be very proud. We are all wanting to see it on the salt. :cheers:
Glen
Crew on Turbinator II

South West, Utah

Offline thefrenchowl

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Re: The Worlds Fastest NIMBUS
« Reply #104 on: May 13, 2015, 08:42:25 AM »
Hi Lars...

Looks more than bloody good!!!

Patrick
Flat Head Forever

...What exactly are we trying to do here?...