Landracing Forum Home
November 21, 2017, 05:00:47 AM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News:
BACK TO LANDRACING.COM HOMEPAGE
 
   Home   Help Search Calendar Login Register  


(Note: Donations are not tax deductible)







Live Audio Streaming and Archives of Past Events
Next Live Event: TBD
Pages: 1 2 3 4 5 6 [7] 8   Go Down
  Print  
Author Topic: The Worlds Fastest NIMBUS  (Read 32485 times)
0 Members and 1 Guest are viewing this topic.
55chevr
Hero Member
*****
Offline Offline

Location: Long Island, NY
Posts: 2221





Ignore
« 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
Logged
wobblywalrus
Hero Member
*****
Offline Offline

Age: 64
Location: backwoods Oregon
Posts: 4443





Ignore
« 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.
Logged
nanno
New folks

Offline Offline

Location: Galloping Goiters, Georgia
Posts: 22




Ignore
« Reply #92 on: November 24, 2014, 04:31:12 PM »

The exhaust looks downright awesome!

(The rest ain't too bad either  grin )

Cheers,
Greg
Logged
octane
Sr. Member
****
Offline Offline

Age: 60
Location: Copenhagen, Denmark
Posts: 522


Nimbus 750 APS-VBF




Ignore
« Reply #93 on: May 10, 2015, 01:07:10 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



..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 :





Yeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeah !!!
« Last Edit: May 10, 2015, 01:21:50 PM by octane » Logged

"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
Glen
Global Moderator
Hero Member
***
Offline Offline

Age: 82
Location: South West Utah
Posts: 6927

SCTA/BNI timer 1983 to 2004, Retired,. Crew on Tur



« Reply #94 on: May 10, 2015, 02:24:08 PM »

Lar's it looks great and the sound is awesome. Nice work.  cheers
Logged

Glen
Crew on Turbinator II

South West, Utah
bak189
Sr. Member
****
Offline Offline

Age: 80
Location: CA. AZ. Netherlands
Posts: 761




Ignore
« Reply #95 on: May 10, 2015, 02:32:44 PM »

Hey, Lars seeing the bike uses a drive shaft.....what are you using for gear ratios?Huh??
Logged

Question authority.....always
Peter Jack
Hero Member
*****
Offline Offline

Age: 74
Location: Calgary, Alberta
Posts: 3444





Ignore
« Reply #96 on: May 10, 2015, 03:29:12 PM »

Lars, you've done it again sir, beautiful build!  cheers cheers cheers

Pete
Logged
Old Scrambler
Sr. Member
****
Offline Offline

Age: 70
Location: Plymouth, WI
Posts: 629


Going Fast - Slowly




Ignore
« Reply #97 on: May 10, 2015, 06:47:51 PM »

Odin should be pleased smiley smiley smiley smiley smiley cheers
Logged

2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
tauruck
Hero Member
*****
Offline Offline

Age: N/A
Location: Johannesburg, South Africa
Posts: 4471





Ignore
« Reply #98 on: May 10, 2015, 09:42:46 PM »

Awesome build Lars. Much attention to detail. cheers
Logged

sofadriver
Sr. Member
****
Offline Offline

Age: 67
Location: tacoma, wa
Posts: 486





Ignore
« Reply #99 on: May 10, 2015, 11:43:32 PM »

DAYUUM !!!!!!!!
Logged

Mike in Tacoma

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

100cc APS/G #833
sabat
Hero Member
*****
Offline Offline

Location: Athens, GA
Posts: 1286





Ignore
« Reply #100 on: May 11, 2015, 10:16:52 AM »

Amazing work, absolutely beautiful bike !!    cheers
Logged
mtkawboy
Sr. Member
****
Offline Offline

Location: Billings Mt
Posts: 459




Ignore
« Reply #101 on: May 11, 2015, 03:21:50 PM »

A work of art, just beautiful
Logged
saltwheels262
Hero Member
*****
Offline Offline

Age: 63
Location: cumberland plateau
Posts: 1059


LTA 7/2013




Ignore
« Reply #102 on: May 11, 2015, 05:36:41 PM »

very nice, Lars.
the big end on the con rod sure is beefy .

Franey
Logged

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 -- made a 2 state change in ZIP codes

" it's not as easy as it looks. "
                            - franey  8/2007
Glen
Global Moderator
Hero Member
***
Offline Offline

Age: 82
Location: South West Utah
Posts: 6927

SCTA/BNI timer 1983 to 2004, Retired,. Crew on Tur



« Reply #103 on: May 11, 2015, 08:16:28 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
Logged

Glen
Crew on Turbinator II

South West, Utah
thefrenchowl
Full Member
***
Offline Offline

Age: 66
Location: Great Britain
Posts: 220



WWW

Ignore
« Reply #104 on: May 13, 2015, 07:42:25 AM »

Hi Lars...

Looks more than bloody good!!!

Patrick
Logged

Flat Head Forever
www.harleykrxlrtt.com
...What exactly are we trying to do here?...
Pages: 1 2 3 4 5 6 [7] 8   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!


Google visited last this page October 19, 2017, 07:26:25 PM