SNAIL

petitbeberose · Snailer Joined: 27 Dec 2011 Posts: 8

Hi, I m fairly happy with my 1959 AZ motor in most driving conditions, it is what it is. However, here we have those shallow but loooooooong uphills for which my poor little 425 cc is no match, i end up at 20 mph in second gear. which is fine, I m never in a hurry but i was wondering if a small dose of nitrous right before performance degrades and when the car is doing fine at 50 mph in 4th could help me me maintain momentum and conquer the hill without blowing up anything.
I cant possibly be the only one to have wondered about it and i was wondering if any of you had experimented with it, successfully or not,
Thanks,
Francois
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1959 2cv

marcusj · Dropped Joined: 25 Jul 2010 Posts: 177

Please let someone have experienced with nitrous - I also want to know!
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Praise the lowered!

Shadowsintonightmare · Snailer Joined: 26 Mar 2011 Posts: 95 Location: eindhoven,

could be intresting, i dont have experince with it, would like to try it sometime, but the cost is the problem, first going to make a supercharger for it. that would help altot aswel!

marcusj · Dropped Joined: 25 Jul 2010 Posts: 177

Harley kit 499 $

http://www.dynotunenitrous.com/store/scripts/prodView.asp?idproduct=302
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Praise the lowered!

Peter · Posted: Sun Feb 05, 2012 1:01 pm Post subject:

Why not spend money on something that thakes you up the hill and perform every mile of the way?

650cc bigbore, about 80 Nm and 47 hp.

I've got one in my Ami. It is very nice to drive it.
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Etienne · Hoodrider Joined: 25 May 2007 Posts: 2829

Do you sell these ?
Seem very nice...
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petitbeberose · Snailer Joined: 27 Dec 2011 Posts: 8

Thanks for all the replies, guys.
I m just trying to give the car a tad more usability for the terrain I have to face here in georgia. I absolutely love the car and i drive it as much as i can. If I want speed, I have other vehicles and motorcycles but it sure would be nice to not have to lose so much performance so quickly when the hills start.

I wrote a Nitrous company here in the states, they put their heads together and decided it would not be a good idea on this engine. not strong enough. Whether they re right or wrong, I havent heard from anyone who had done it succesfully or not so I ll have to defer to their judgment. comments?

The big bore or even swapping engines with a 602 was my first option but I called a supplier of both and I was told neither was on option to upgrade my AZ 425. Right or wrong, i dont know, I m new at this and searching this forum and the internet hasnt brought many answers on this subject.

Peter, PM sent

Thanks again.
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1959 2cv

Rusty · Posted: Mon Feb 13, 2012 9:48 am Post subject:

Hi Peter,

As far as I know, nitrous is only suitable for short powerbursts, if you use it for a longer time (uphill) your engine will probably overheat, or seize completely because of the extra strain on the mechanical parts.

I'd think the best way to keep your car reliable and keep the caracteristics of the car is to upgrade the engine to an early 2cv 6 one (incluiding gearbox)

Here is a link to a website that is like the bible for newbies in 2cv tuning: http://www.cats-citroen.net/ see the 2cv part and then modernisation.

I can imagine that it is harder to source parts in the states, so it might be an option to tune your engine with double carbs (has been done in the 50's and 60's as well)

good luck with your project!

Greetzzzzzzzzzzzz
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Dyane1983 daily driver (will soon get bmw power)
2CV Pick-Up custom
AK400 in parts

Etienne · Hoodrider Joined: 25 May 2007 Posts: 2829

Or find a rare 500cm3 kit...
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www.super2cv.com

Olli · Posted: Wed Feb 15, 2012 9:11 am Post subject:

Or make your own cheap ass diy 500cc kit by machining 2cv6 barrels.

-Olli
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Wout · Posted: Mon Feb 20, 2012 7:54 pm Post subject:

We have used nitro one time.
With our buggy (visa engine)
Just mixed with the fuel and drove with it.
(only about 5liter total)
It boosted the car, but after we had starting problems.
You could hear it that is was a bit to much for the engine.
It was fun, but I would not recommand it for your durability.

The best way: visa engine

petitbeberose · Snailer Joined: 27 Dec 2011 Posts: 8

Thank you all for your replies. It seems like I d have to go through a whole lot of work and expenses to swap with a 602 engine and gearbox, even more with a Visa set. I m not saying never but for now I m just going to live with it. The present powertrain is suitable for most my uses. Yes it is very painful to go up hills in second gear at snail speed but if I put it in perspective, it s a difference of only 5 minutes for me to go to work compared to my 400hp Hemi powered dodge truck.
For now, I ll take care of a suspected bad reniflard, do a compression test to make sure my lack of performance isnt engine related and will keep on driving my baby with a smile on my face, waving people to pass me by.

Questions: 1)any fuel recommendations and could i use aviation 100 low lead to aid in performance. Fuel is at least 15% ethanol here and i m wondering if that also could be a factor.
2) i have the "short" kind of exhaust that ends under the feet. smelly and noisy. were I to extend it to the back like later models, would that help or hinder engine power and torque?

Merci
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1959 2cv

dyanut

Hi Francois,
even with the relatively low amounts of ethanol or other additives which have put in fuel in the UK, it's been found beneficial to increase the primary petrol jet diameter by 5% to correct the mixture.
(Original jet was a 102.5, replacement is 107.5, increase in flow capacity 10%)

Just found this information which should be helpful to you in deciding what changes to make to the main jet in your 32PICS (?) carburettor.

http://www.thecarburetorshop.com/Ethanoluse.htm

If it's got a 150 main jet and you're using fuel with 15% ethanol, the suggested increase in _fuel flow_ of 15% would require the main jet to be taken out to 160. ( That's 1.6 mm in real money.)

I don't know where you live, but you should also take the elevation above sea level into account, so if you're close to sea level, go for the full increase. If the car is mostly used up in the mountains, the increase in jet size does not need to be so much.

Also noticed the comment about engines with lower compression ratios being affected more by the addition of ethanol to petrol/gasoline.
An A79/0 was a fairly 'soft' engine with its CR of only 7.75:1, so it should stand being increased to just over 8.0:1 without too much risk, but that depends on the condition of the bottom end.
Any hint of rumbling or knocking in the bowels of the engine room would rule out shortening those barrels...

Ken

petitbeberose · Snailer Joined: 27 Dec 2011 Posts: 8

Hi Ken, thanks for your reply.
I have access to ethanol-free Race fuel, 98 octane and higher (all the way up to 116, if i recall), I think I might want to try that first. Am I endangering my engine?
Aviation 100 low-lead could have worked except for the plug fouling issues and for the fact that it's a high fined offense here in georgia Sad

If race fuel wont work then I guess I'll have to calibrate my carburator for ethanol and altitude as you suggested.
Thanks!!
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1959 2cv

dyanut · Posted: Sat Feb 25, 2012 1:36 am Post subject:

Francois,
I cannot think of any reason why high octane fuel would cause any problems for the engine, especially if it's ethanol-free.
On the other hand, a soupçon or two of leaded fuel smuggled into each tankful would be useful, as those older engines are reported to have less tolerance for unleaded than later models.
http://www.ecas2cvparts.co.uk/info_pages.php?pages_id=28?WSid=ce1ba10bcca64a0b232219a43d1b148b

Be interested to hear how you get on, as I'm about to rebuild an M4 engine after finally managing to track down a brand new crankshaft.

If you do want to try a larger jet size, I'm be happy to send you a jet out of the box of parts carbs, alternatively there are Mikuni jets which are a direct fit in the Solex body.

Ken.
( It's that 'carburatorshop' guy in Missouri who deserves any credit which is due, all I've done was some scouting around with Google... Wink

)