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 Post subject: upgrading desmodue to dual spark!
PostPosted: Thu Feb 19, 2009 6:30 am 
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paso grand pooh-bah
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Location: siena, italy
model: 750 Paso
year: 1988
Just linked from "forum desmodromico" : how to machine stock heads to place a second spark plug!
Just get drunk watching pics!!!

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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Thu Feb 19, 2009 9:18 am 
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paso grand pooh-bah
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Location: southern Germany
model: 750 Paso
year: 1987
no links

With dual spark conversions you really have to know what you`re doing. If the timing is not set exact you can ruin your engine pretty fast.


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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Thu Feb 19, 2009 10:17 am 
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paso grand pooh-bah
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Location: Finland
They have modified many 900cc Supersport(91-97) syl. heads for 2 spark plugs, but that is easier in that air/oil cooleed engine... Some of them used Harley coils. :smoke:

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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Thu Feb 19, 2009 11:11 am 
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paso grand pooh-bah
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Location: Manchester, England.
model: 907 I.E.
year: 1992
main site link is here for those interested written English also available

http://www.desmodromico.com/homepage.htm

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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Fri Feb 20, 2009 7:02 pm 
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paso grand pooh-bah
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Location: siena, italy
model: 750 Paso
year: 1988
here's the link! It didn't worked yesterday :huh:
The write about 350, 650 750 and 900 heads machined to place a second plug!
I have not enough time to read the entire topic :,(
So busy by now!

http://desmodromico.forumattivo.com/officina-tuning-f4/preparazione-twin-spark-per-motori-desmodue-tutti-i-modelli-escluso-1000ds-t1917.htm

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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Fri Feb 20, 2009 8:46 pm 
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paso grand pooh-bah
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Joined: Tue Dec 06, 2005 12:00 am
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Location: Roma, Italia
model: 907 I.E.
year: 1992
Unfortunately, it can't be read by not registered users.
I tried to register to that forum, but seems the administrator has to authorize me before I can read that forum.
Ciao

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Ducati 907IE 1993 Nero
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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Sun Feb 22, 2009 8:23 am 
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paso grand pooh-bah
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Joined: Sun Aug 01, 2004 12:00 am
Posts: 1096
Location: siena, italy
model: 750 Paso
year: 1988
Image
Image
Image

This is the work made by a guy from Torino


http://www.ducarosso.it/ducati_ducarosso_modifiche.html
This is the site of another one from Milano

:thumbup: :thumbup:

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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Sun Feb 22, 2009 8:25 am 
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paso grand pooh-bah
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Location: siena, italy
model: 750 Paso
year: 1988
Image
And this is from an american site...

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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Sun Feb 22, 2009 10:07 am 
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paso grand pooh-bah
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Location: Roma, Italia
model: 907 I.E.
year: 1992
Very interesting.
On a 900 engine, he has reached 92hp, from 78hp of the stock engine.
If someone needs the translation...
Ciao

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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Sun Feb 22, 2009 3:21 pm 
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paso grand pooh-bah
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Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
So he has raised the compression to 13:1 with a new set of pistons,ported the head with new valves,added Benzene to the fuel as well as the additional spark
not your average street mod :choo:

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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Sun Feb 22, 2009 5:15 pm 
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paso grand pooh-bah
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Location: Finland
More compression=more power, simple. But lifetime of engine will be much lower. Its wiser to make more CC*s, than only compression... :smoke:

But Ducapaso is very good in marketing, as he put some pipe there(upside down, like newer Ducati forks... :lol: ) with stamped "made in Italy"... :lol: :lol: :lol: :lol: Are you working with marketing ??? :mrgreen:

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KTM 990 Adventure -08 metal dark grey
Paso 750 -89 red/metal grey
Paso 907IE -91 red/metal grey
Paso 907IE -91 red
ST4S -02 red/metal grey
ST2 -01 red/metal grey
Volvo V70 Bi-Fuel Classic/titanium grey


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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Sun Feb 22, 2009 7:06 pm 
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paso grand pooh-bah
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Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
I wonder what power increase you could have by a mild compression boost, say 10:1 and the port and polish with the extra spark. Adding the second plug seems to be fairly easy and I do have a spare set of heads and cylinders,hmmmmm another project to put on the todo list, if I ever get through the honeydo list :mrgreen: :thumbup: :thumbup:
Antti! your a genius :thumbup: :thumbup:

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Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie


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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Sun Feb 22, 2009 7:37 pm 
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paso grand pooh-bah
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Location: Finland
Dual spark is not bad idea at all, as also factory have gone that way.... Its good for fuel burning surely. Its much easier to do to air/oil cooleed engines, than to water cooleed ones. If do such to water engine, then have to be VERY sure about water/oil lines in sylinder head. Surely that can be done also, but i wouldnt do it to my OWN "water heads". As i told earlier, many guys have done it to air /oil cooleed 900cc SS engines with quite good results, but its not only way to get more power.... There is also big bore kits, etc... ALL depends, HOW MUCH MONEY u are ready to invest such old bike, as Pasos are... I think that allways... With enough money u can also take flight to space... :thumbup: :thumbup: :thumbup:

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Antti http://www.youtube.com/watch?v=HeKOh3XoXPg&NR=1
KTM 990 Adventure -08 metal dark grey
Paso 750 -89 red/metal grey
Paso 907IE -91 red/metal grey
Paso 907IE -91 red
ST4S -02 red/metal grey
ST2 -01 red/metal grey
Volvo V70 Bi-Fuel Classic/titanium grey


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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Sun Feb 22, 2009 11:09 pm 
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paso grand pooh-bah

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Location: Gothenburg, SWEDEN
model: 907 I.E.
year: 1991
What is the power difference between 2V 1000 & 1000DS?
I think dual spark is mainly for emissions, not power,
but what do I know.... :roll:

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M900 -97
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 Post subject: Re: upgrading desmodue to dual spark!
PostPosted: Sun Feb 22, 2009 11:54 pm 
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paso grand pooh-bah
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Location: Hilltown,Pennsylvania
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dual spark is strictly a flame propagation thing, related to higher octane fuels required for higher compression ratios.don't think anyone wants to go there ...again
that is why he adds green benzene in the 13:1 version of his mod
I don't actually think dual spark would add anything to a normal compression engine but it would sure be cool :thumbup:

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There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie


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