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Crankshaft rigging

 
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Gilles



Joined: 11 Aug 2019
Posts: 3
Location: France

PostPosted: Sun Aug 11, 2019 6:23 pm    Post subject: Crankshaft rigging Reply with quote

Hello bimoty friends.
I am a retired mechanic and I just took charge of a V-due to restart (stopped for 12 years).
Following a broken piston, the engine was dismantled and never worked!
It is a Dell'orto 39 carburettor model.
First surprise and first question: the two pistons go up at the same time, which seems to me illogical for a 2 cylinder engine 2 times.
What do you think ?

Thanks
Gilles
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Gavin944888



Joined: 29 Jan 2014
Posts: 401
Location: Essex....way South of Scotland

PostPosted: Sun Aug 11, 2019 6:45 pm    Post subject: Reply with quote

Gilles

Absolutely correct...totally illogical unless it is the Big Bang set up....which it is.

Illogical is on the Bimota crest just below the box of frogs...in Latin.
The big bang twin firing system was introduced....I think by Cagiva ....but I could be wrong....
but,....certainly from the MotoGP 500 era

Hope this helps your rebuild project and stops you drilling another hole for the second crank pin

Good luck

Gavin
The Scottish Engineer
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2bims



Joined: 03 Apr 2010
Posts: 6346

PostPosted: Sun Aug 11, 2019 7:37 pm    Post subject: Reply with quote

Confirmed...as Gav says....twin crank...but big bang motor...wish you luck....piston searching...hope you keep us updated....I have the full strip down workshop manuals on pdf to email if you wish...or download them for free from vdue.it

Last edited by 2bims on Mon Aug 12, 2019 9:37 pm; edited 1 time in total
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Gilles



Joined: 11 Aug 2019
Posts: 3
Location: France

PostPosted: Mon Aug 12, 2019 8:26 am    Post subject: Reply with quote

Thanks for those quick answers.
Ok, that's correct but illogical ..
Yes I want the workshop manuals at the following address: gilbrn@orange.fr

Gilles
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Moreno



Joined: 15 Oct 2018
Posts: 57
Location: Chiavenna (italy)

PostPosted: Mon Aug 12, 2019 6:37 pm    Post subject: Reply with quote

what was the cause of the break? it would be useful to understand the problem to prevent it from happening again .... the original pistons you will not find them anymore .... but I drive fiedler that reproduces them
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2bims



Joined: 03 Apr 2010
Posts: 6346

PostPosted: Mon Aug 12, 2019 9:39 pm    Post subject: Reply with quote

Gilles wrote:
Thanks for those quick answers.
Ok, that's correct but illogical ..
Yes I want the workshop manuals at the following address: gilbrn@orange.fr

Gilles


Click and download them all for free here from the one and only trusted source....the man that bought the company and all 320 Bimota Vdues....theres lots of manuals so click and download one by one

http://www.vdue.it/manuali.php
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Weed



Joined: 29 Dec 2013
Posts: 173
Location: Perth Australia

PostPosted: Tue Aug 13, 2019 12:14 am    Post subject: Reply with quote

When I get around to it I want to experiment with different crankshaft timings to see what differences I get with engine vibration & power
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Gammaboy



Joined: 25 Feb 2016
Posts: 174
Location: Brisbane, Australia

PostPosted: Wed Aug 14, 2019 1:03 am    Post subject: Reply with quote

Weed wrote:
When I get around to it I want to experiment with different crankshaft timings to see what differences I get with engine vibration & power

If you move away from the "twingle" timing, you'll have to re balance the cranks completely, they're not balanced the same as a single cylinder crank and the balance is out of phase because of the twin crank 90 v-twin configuration. Personally, I wouldn't bother messing with it.
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Weed



Joined: 29 Dec 2013
Posts: 173
Location: Perth Australia

PostPosted: Wed Aug 14, 2019 11:51 pm    Post subject: Reply with quote

Gammaboy wrote:
Weed wrote:
When I get around to it I want to experiment with different crankshaft timings to see what differences I get with engine vibration & power

If you move away from the "twingle" timing, you'll have to re balance the cranks completely, they're not balanced the same as a single cylinder crank and the balance is out of phase because of the twin crank 90 v-twin configuration. Personally, I wouldn't bother messing with it.


It is a project in the future Gammaboy when I run out of projects. I have a spare motor I can rig up to an engine dyno if I want to play.
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