Hi I'm going to fit a Visa engine which I have and am going to retain the Visa flywheel with 2cv ring gear. I know I have to get the flywheel machinde to move the ring gear to mate with the 2cv starter. I'm fitting with an adapter a 123 evo ignition so dont need to fit sensors and thereforedon't need the sensor carrier so no spacer between the engine and box. How much do I need to machine off of the flywheel and are there any other problems I might encounter, using Dyane/Ami forced air system.

Bring the 2cv flywheel and ask them to machine the Visa wheel to exact same measurements

Flywheel - 6mm. If you leave the sensor spigot on the flywheel you will have to file the bell housing just under where the starter sits as the spigoy hits the belhousing. You can do this when they are together to check. 123 ignition is good as I used the same but the little piece that sits inside the cam shaft and has expanding grip is rubbish!!! Mine slipped so timing was way out. Visa engine will only run with huge airbox and all pipe work. Tried with different air boxes including Dyane but the engine run terrible. I gave up with Visa engine and went back to 602 now with turbo charger

I've looked after several A models fitted with Visa and LN(A) engines running with 18/26 standard carbi's + standard 602 air filters without any problems.

Hi All.
I am also intending to put my Visa engine in a 2CV, but I will be using the original complete Visa ignition system, etc.
I will be using a 2CV ring-gear but I’m a bit confused about the position thing:
I understand that moving the position of the ring-gear 6mm forwards will allow it to clear the bell-housing if you are bolting the bell-housing right up to the engine without any spacers. But I will be using spacers (one of which is a bracket for the timing sensors). This will move the bell-housing away from the flywheel. In which case, is it still necessary to machine the flywheel to mount the ring-gear 6mm further forward?
Also, as 2CViking says to get the ring-gear in the same position as on a 2CV flywheel, that must mean that the starter pinion and ring-gear will be lined up with each other, as long as you don't fit spacers between the engine and gearbox. But having spacers between the gearbox and engine will affect the starter & ring-gear positions in relation to each other.
So, is it necessary to put the ring gear 6mm further forward if I am already moving the engine (& flywheel) 15mm* further away from the bell-housing (& starter pinion)? If so, will this adversly affect the starter operation?
Thanks
(*NB: I haven't measured the thickness of the bracket and spacers, but from memory I think they are about 15mm: I'll check tomorrow).

I've not heard of putting spacers between the engine and box before, and 15mm is quite a lot. The timing sensor brackets I've seen are no more than a couple of mm thick and just need washers over the other studs to keep things square. From what you've said it sounds to me as if you'd need to move the ring gear 9mm backwards, but I'd be more concerned about how you're planning on getting the clutch release bearing to reach the clutch.

As far as I'm aware, in order to use the Visa timing sensors, there are only 2 ways of doing it:
1: Cut a 20mm thick section of the Visa bell-housing, incorporating the sensors, and sandwich it between the Visa engine and the 2CV gearbox, or
2: What I intend to do, as described in my previous post, with spacers and bracket similar to this:

Looking at this picture now, I think mine is probably a lot less than 20mm, (maybe it's 6mm???!): I'll check tomorrow. But the 'section of Visa housing' apparently has to be 20mm thick in order to retain enough strength, (ref Jeroen Cat's website:http://www.cats-citroen.net/citroen_atypes/tuning_652conversion.html & http://www.cats-citroen.net/citroen_atypes/tuning_652conversion_2.html).
As far as the clutch is concerned, apparently it is still within reach of the release bearing movement but you have to use the type of gearbox with the longer input shaft splines, (but if anyone knows otherwise, please let me know!).
So assuming the spacer bracket is 6mm thick, do I still need to get the flywheel machined?

I think you will find the bracket that clamps between the gear box is 5mm thick it works well and lets you keep the visa ring on the flywheel and then you can use the visa starter motor ,,,no machining needed, simples

Whilst on this topic,
I hope that neither of you Visa engine owners have bought a lightened Visa flywheel off Ebay recently, particularly if the vendor was in the Doncaster area.

ken

It makes sense for the bracket to be 5/6mm to avoid having to machine the flywheel, and if the clutch release still works fine then Bob's your uncle.

I think the technique Cats describes of substituting part of the visa bellhousing, also requires the corresponding part of the 2cv bellhousing to be removed, so the overall length remains the same.