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Two carbs in 2CV - how to?

 
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tfaerch
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Joined: 27 Sep 2011
Posts: 15
Location: Denmark

PostPosted: Sat Feb 21, 2015 7:50 pm    Post subject: Two carbs in 2CV - how to? Reply with quote

I'm shure I have seen a picture of an engine with two carbs.
Can't remember if it was here.

But …

Any experince with some specific carbs?
And is it worth the effort?

BR

Thomas
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Harley
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Joined: 26 Nov 2007
Posts: 394
Location: Braidwood - Australia

PostPosted: Fri Feb 27, 2015 12:39 am    Post subject: Reply with quote

Hi Thomas,

I think the twin carb pic was Lars' car before in went turbo? the pics seem to be lost.
Also i have seen adapters on Geoff Arches site, NES, small adapters that mount the carby under the heater box. I would assume that SU carbs would be the best option...

Harley
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Bart
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Joined: 17 Jun 2007
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Location: Södertälje

PostPosted: Fri Feb 27, 2015 5:08 pm    Post subject: Reply with quote

A friend in the UK had 2 Dellorto carbs on his 2cv. The pictures in his topic are gone though.
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tfaerch
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Joined: 27 Sep 2011
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Location: Denmark

PostPosted: Fri Feb 27, 2015 8:35 pm    Post subject: Reply with quote

Found one: http://snail.s4.bizhat.com/viewtopic.php?t=1243&postdays=0&postorder=asc&start=75

I was inspired when I got my drivers licence for MC.
One of the bikes was a BMW, and it looked simple:


(I know cabels isn't the solution)
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Lars E
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Joined: 03 Aug 2007
Posts: 172
Location: Aale city, denmark

PostPosted: Wed Mar 04, 2015 1:06 pm    Post subject: Reply with quote

My old engine


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Mvh. Lars E
2cv 0,6Tii special


Last edited by Lars E on Wed Mar 04, 2015 9:53 pm; edited 1 time in total
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Lars E
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Joined: 03 Aug 2007
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Location: Aale city, denmark

PostPosted: Wed Mar 04, 2015 9:52 pm    Post subject: Reply with quote

Not my engine. Pictures from the net.







[img]http://i907.photobucket.com/albums/ac277/motomotie/SDC10689.jpg[img]

[/img]http://www.pp-2cv.be/FR/Catalogue/Moteur/PICT/A2500B.jpg[img]

[/img]
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Mvh. Lars E
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tfaerch
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Joined: 27 Sep 2011
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Location: Denmark

PostPosted: Sun Mar 08, 2015 10:01 pm    Post subject: Two carbs in 2CV - how to? Reply with quote

Thanx Lars.

I found the pictures of the "airplane engine" too.

What carbs did you use?
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Shadowsintonightmare
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Joined: 26 Mar 2011
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PostPosted: Mon Mar 09, 2015 9:05 pm    Post subject: Reply with quote



there where dual carb setups for the 2cv loooong time ago! here is a awesome rebuild by olli erkkila
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Wout
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Joined: 16 Sep 2008
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Location: Arendonk, Belgium

PostPosted: Mon Mar 09, 2015 9:30 pm    Post subject: Reply with quote

Geatan did it as well.
Check it here:
http://www.snail.s4.bizhat.com/viewtopic.php?t=1243&start=0&postdays=0&postorder=asc&highlight=
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Lars E
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Location: Aale city, denmark

PostPosted: Tue Mar 10, 2015 5:22 pm    Post subject: Reply with quote

Mine is Mikuni from a 2 cylindert Japanese motor bike on 400-500cc and 40 hp .
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Mvh. Lars E
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Rusty
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Joined: 19 Jun 2007
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PostPosted: Fri Mar 13, 2015 10:26 am    Post subject: Reply with quote

(Dutch) lomax with double 30mm Dellortho on a visa engine

https://www.youtube.com/watch?v=LNRupet8SEs

he drove it for 1 summer, then took off the carbs, his complete front steeringsetup, kingpins, driveshafts etc were ruined. and gasmilage was only half what he had on the original Solex carb. on top speed/ higher RPM range there was not much difference compared to the Solex carb, only on low rpm's it was really fast.

and here on a rolling road test, got up to 47 HP (VISA ENGINE!!):

https://www.youtube.com/watch?v=1d4vs3EZv4I

if it is worth it? up to you.

I'm going to try with double SU HS2 carb (32 mm also on Visa engine).

greetzzzzzzzzzzzzz
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Lars E
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Location: Aale city, denmark

PostPosted: Fri Mar 13, 2015 3:01 pm    Post subject: Reply with quote

Then his front suspension not have been good from the start.
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Meeuw
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Joined: 24 Sep 2008
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Location: Zandvoort, The Netherlands

PostPosted: Mon May 11, 2015 8:11 pm    Post subject: Reply with quote

Posted a pic of a dual carb setup on the Barbot topic. Carbs are mounted on short studs/manifolds.

Keep as a golden rule that a short intake manifold gives you more HP on higher revs, a longer intake manifold gives more bottom power. Too long gives bad throttle response.

Second keep in mind that a narrow sized intake manifold allows for greater airspeed, thus enforcing a better mixture.

Lastly don't forget that your exhaust can (and will) help the intake of the air/fuel mixture. A clean combustion chamber without exhaust gasses gives way for more bang.... But do not build a flamethrowersizedchimney under your car.... 'Big pipes' do not help, you'll need a perfect balance....

For neat calculations go to this site: http://dairally.net/daihard/chas/MiscCalculators/DaiPipes.htm

I'll bet this makes everybody happy Cool
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Bart
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PostPosted: Mon May 11, 2015 9:57 pm    Post subject: Reply with quote

Thanks for that link that's quite interesting to play with!
Meeuw wrote:
Second keep in mind that a narrow sized intake manifold allows for greater airspeed, thus enforcing a better mixture.

Please bear in mind as well that narrow pipes and greater speed increase turbulance = flow resistance and thereby pressure drop in you intake path and so a lower effective intake pressure and less air mass in the combustion chamber.. I would try to keep the same diameter all the way as much as possible or gradually decreasing diameter. bla bla bla
It is all a matter of balance..
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Meeuw
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PostPosted: Mon May 11, 2015 10:54 pm    Post subject: Reply with quote

There is a lot to say about diameters, turbulence and so on. The link will provide decent info on tube sizes...........

Or ask Philip van Gool (VGS).... he knows a lot and is a brilliant engineer on 2cv engines.
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