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TWIGGY - DB4 Trackbike
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Sun Nov 30, 2014 10:30 pm    Post subject: Reply with quote

DB4 swing vs 1000SS swing vs 900SSie swing



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Monster 1100 -96 for the road / 1100SS for the track / DB4 new track project
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Sun Nov 30, 2014 10:32 pm    Post subject: Reply with quote

SSie steering pin shortended 30mm


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Monster 1100 -96 for the road / 1100SS for the track / DB4 new track project


Last edited by hnracing on Sun Nov 30, 2014 10:51 pm; edited 1 time in total
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Sun Nov 30, 2014 10:42 pm    Post subject: Reply with quote

Some weight and dimension values
My weight 76,5 kg
1100SS trackbike without fuel 157 kg
Frame 1000SS 12,3 kg
Frame 1000SS with rear cut directly behind the exhaust bracket 10,3 kg
Frame DB4 5,3 kg
Swing 1000SS 4,1 kg
Swing 900SSie 3,6 kg
Swing DB4 3,6 kg
Alu tank with cap no pump no filter 2,5 kg
Tank dummy 1,8 kg
Rear damper Öhlins 1000SS 3,4 kg
Rear damper Nitron 2,9 kg
Rear damper Öhlins 1000SS lenght 340mm with 7mm thread visible
Rear damper Nitron lenght 330 with 5mm thread visible
Swing 1000SS distance swingaxel - rearaxel 474 - 488 - 501 mm min middle max
Swing 900SSie distance swingaxel - rearaxel 469 - 488 - 506 mm min middle max
Swing DB4 distance swingaxel - rearaxel 445 - 460 - 475 mm min middle max
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deebee4



Joined: 08 Jan 2011
Posts: 264
Location: Netherlands

PostPosted: Sun Nov 30, 2014 11:20 pm    Post subject: Reply with quote

Cool pictures and nice data for comparisment.

db4 frame really is light. And shorter with more steep steering head angle.

I think you will love the snappy handling compared to the Ducati frames.

Only difference might be offset value of the Ducati forks compared to the Bimota forks. If you want values I would have to measure them up.
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brian



Joined: 22 Aug 2011
Posts: 2685
Location: QLD, Australia

PostPosted: Mon Dec 01, 2014 12:26 am    Post subject: Reply with quote

I am really looking frward to this build! Nice pics comparing the frames and swingers. I'm suprized how much lighter the db4 frame is.
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Current motorcycles - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, ‘94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, ‘61 BSA A10 650
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polyesterpig



Joined: 30 Jan 2011
Posts: 49
Location: California USA

PostPosted: Mon Dec 01, 2014 2:34 am    Post subject: Reply with quote

There is someone in Japan racing the bimota DB4ie with a 1078cc dual spark engine. I know it is the biposta model because I have some pictures without the fairing. If I remember correctly, they had to slightly trim the fins on one of the cylinders so it would fit the DB4 frame. There were two of these bikes, one with ohlins and the other with Showa forks.

Here is a link to the blog. They also ditched the wire harness / ecu and used an aftermarket .

http://blogs.yahoo.co.jp/team372001/55975713.html

http://blogs.yahoo.co.jp/team372001/33728580.html

http://blogs.yahoo.co.jp/team372001/37089498.html

http://blogs.yahoo.co.jp/team372001/35905532.html

http://blogs.yahoo.co.jp/team372001/38939005.html

http://blogs.yahoo.co.jp/team372001/55105833.html
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2002 Cannondale E440
2003 Cannondale Super Mono 440
(2) 2003 Cannondale E440R
2010 Ducati Hypermotard evo SP
2000 Bimota DB4ie BiPosto
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SpikeC



Joined: 20 Aug 2013
Posts: 450
Location: Portland, Oregon

PostPosted: Mon Dec 01, 2014 7:02 pm    Post subject: Reply with quote

Bimota welds are so pretty!
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Spike C.
Portland, Oregon, USA
2008 Bimota DB5R
1965 Triumph T100SC
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 02, 2014 3:20 pm    Post subject: Reply with quote

deebee4 wrote:
Cool pictures and nice data for comparisment.

db4 frame really is light. And shorter with more steep steering head angle.

I think you will love the snappy handling compared to the Ducati frames.

Only difference might be offset value of the Ducati forks compared to the Bimota forks. If you want values I would have to measure them up.


Yes I really hope that the short wheelbase, more steep steering head angle and less weight will give a really snappy handling of the bike.

The offset is 30mm for the SSie triples / yokes.
Please measure yours Wink



/Henrik
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Monster 1100 -96 for the road / 1100SS for the track / DB4 new track project


Last edited by hnracing on Tue Dec 02, 2014 4:09 pm; edited 1 time in total
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 02, 2014 3:41 pm    Post subject: Reply with quote

DB with 1000/1100 engine.
DB1
with 1100 engine can be found here:
http://beta-evo-db1.blogspot.com/
DB2
We have a DB2 here in Sweden with Monster1100S engine.
And "crankcase" have a picture here of a DB2 with 1000 engine :
http://www.bimotaforum.co.uk/viewtopic.php?t=2774&start=0&postdays=0&postorder=asc&highlight=db2++engine
"Posted: Sat Sep 07, 2013 10:48 am"
DB4
My frame have already had a SportClassic 1000cc engine in it.
If google translate the above japanese pages correctly it seems that it is the same bike. Silver/red before crash, green/black after crash with a fully tuned 1100 engine.
Bernhard Klose in Germany have a DB4 with 1000/1100 engine.
Issue 1 http://www.klose-motorraeder.de/data/storage/attachments/13202357570174.JPG
Issue 2 http://www.klose-motorraeder.de/data/storage/attachments/13202356998274.JPG
Have also seen a picture of a yellow DB4 racing in Italy Supertwins with a DS engine.
And here it is:

Italian DB4 with 1100ds engine. Owned by Luca Pierazzi:
http://aadm.github.io/2009-08-27-speedweek-2009.html
https://farm4.staticflickr.com/3472/3852659895_dd4c3d5802_o.jpg
https://farm3.staticflickr.com/2617/3853625638_245948f7aa_o.jpg
http://aadm.github.io/2010-07-13-rientro-in-pista-mugello-2010.html
https://farm5.staticflickr.com/4100/4791093339_ffb36796b3_o.jpg
http://www.sportinfoto.it/forum/viewtopic.php?t=3518
http://www.phase-two.net/public/foto/sezioni/moto/DSW08/Pista/B_13_Pierazzi_1475.jpg
/Henrik
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Monster 1100 -96 for the road / 1100SS for the track / DB4 new track project


Last edited by hnracing on Wed Dec 03, 2014 11:51 am; edited 6 times in total
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polyesterpig



Joined: 30 Jan 2011
Posts: 49
Location: California USA

PostPosted: Tue Dec 02, 2014 6:43 pm    Post subject: Reply with quote

The stock DB4 yoke offset is 35mm. I am thinking of putting on 30mm offset triples too because I want to put on more modern UPSD forks. I was told there might be an issue of the front tire contacting the engine upon hard braking? I have an extra custom made billet 35mm offset top clamp with an alloy stem that fits the Ducati ohlins forks and lower yoke for the DB4. I bought it from Moto Corse Performance in Florida a couple years ago. I never installed it. If I can find the time to post a picture, I will.
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2002 Cannondale E440
2003 Cannondale Super Mono 440
(2) 2003 Cannondale E440R
2010 Ducati Hypermotard evo SP
2000 Bimota DB4ie BiPosto
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 02, 2014 9:23 pm    Post subject: Reply with quote

Interesting!
Share a photo of it.
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 02, 2014 9:26 pm    Post subject: Reply with quote

Found some useful parts at Yahoo in Japan.
Package sent 25 November, arrived in Sweden 1 December !
Frame plugs.
Should there be a O-ring around them ?
Or just the locking screw in the frame?

[/list]
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 02, 2014 9:29 pm    Post subject: Reply with quote

Rear brake setup
Have anyone tried to mount the rearbrake mastercylinder to the engine like Ducati do?
Will the distance from the pedal to the rearseat be ok?




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polyesterpig



Joined: 30 Jan 2011
Posts: 49
Location: California USA

PostPosted: Tue Dec 02, 2014 9:41 pm    Post subject: Reply with quote

[quote="hnracing"]Found some useful parts at Yahoo in Japan.
Package sent 25 November, arrived in Sweden 1 December !
Frame plugs.
Should there be a O-ring around them ?
Or just the locking screw in the frame?
quote]

No o-rings on the plugs, just the screw.
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2002 Cannondale E440
2003 Cannondale Super Mono 440
(2) 2003 Cannondale E440R
2010 Ducati Hypermotard evo SP
2000 Bimota DB4ie BiPosto
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hnracing



Joined: 15 Apr 2012
Posts: 42
Location: Gothenburg Sweden

PostPosted: Tue Dec 02, 2014 9:42 pm    Post subject: Reply with quote

Thanks!
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