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What is the compression ratio?

The compression ratio is the ratio between the volume of the cylinder and combustion chamber when the piston is at the bottom of its stroke, and the volume of the combustion chamber when the piston is at the top of its stroke.

In short: the largest possible volume above the piston / the smallest possible volume above the piston.

Read more: What is the compression ratio?

Why is an aluminium cylinder better than an aluminium cylinder with a steel sleeve?

To give you an accurate answer to this question, it's necessary to give a brief overview of the evolution of cylinders: there were different steps in the evolution concerning the materials used.

Read more: Why is an aluminium cylinder better than an aluminium cylinder with a steel sleeve?

Why is it possible to put in a steel sleeve in a bored out Visa-cylinder? (and how does this go with the story above?)

The Visa-cylinders are thicker than the 602cc 2CV-cylindrs. This is the reason that you can put in steel sleeve / liner into a Visa-cylinder. The working part of the cylinder is thick enough to avoid deformation. Above this the cylinder has 3 to 4 times the thickness of the sleeve so it can detract the heat from the sleeve without creating the warping or washboarding.

Cast or forged pistons?

 

                                                                            

In short: Forged pistons are often used in tuned engines.

Read more: Cast or forged pistons? 

Is the 2CV crankshaft strong enough for the 652cc or the 720cc engine?

Yes, the 2CV crankshaft is strong enough for the 652cc or 720cc engine. This is only thrue in following circumstances:

Read more: Is the 2CV crankshaft strong enough for the 652cc or the 720cc engine?

How many cc’s can you get into a 2CV without using a Visa-engine?

For the bigger engines, you do need a 2CV and a Visa-engine. Since the Visa-engines getting more difficult to find (and therefore more expensive), there are kits available so you don't need the Visa-engine and you can get more cc's out of your 2CV:

Read more: How many cc’s can you get into a 2CV without using a Visa-engine? 

How many cc’s can you get into a 2CV with the help of some Visa-cylinders?

The maximal bore size for the Visa-cylinders is 85mm, which results into 800cc. If you would bore out more than 85mm, the thickness of the cylinder wall will be too tight, with the risk on deformation, warping, washboarding, overheating, …

You can of course chose to combine the 800cc engine with a XL billet-steel crankshaft, this will result into 850cc.  If you do want a big engine, and you also want an optimal driving comfort (depending on the use of your car), we do recommand you the 760cc engine in combination with a XL billet-steel crankshaft; this will result into 810cc and you will have lots of torque, while it will still be comfortable to drive both road and offroad.

How to mount a 652cc kit on a 2CV-crankcase?

You can easily mount the 652cc kit on your 2CV-crankcase. You don’t even need to dismount the complete engine! Attached you can find the manual that will help you mounting the kit step by step. Please note that the camshaft and crankshaft need to be in a good condition! If you’re not an expert in automechanics, we recommand you to consult an experienced professional to mount the kit.
You can download the manual here.

How to mount a 720cc kit on a 2CV-crankcase?

To mount the 720cc kit on your 2CV-crankcase, you need to make some modifications. You will need to modify the crankcase and the cylinderheads. You will also need the 2CV cooling panels.
Please note that the camshaft and crankshaft need to be in a good condition!
If you're not an expert in automechanics, we recommand you to consult an experienced professional to mount the kit.
You can download the manual here

Is it allowed to tune a 2CV?

This depends on where you live (1 Europe they say…). Anyway you will need to inform your assurance company that you have increased the capacity. Further on you will need to ask at the technical control how the procedure is in your country. In almost every country there are possibilities to make this legal, but it might take some time. It is your responsability to make sure you’ve taken arrangements to be in order with the applicable legislation.
Often these engines are used for rallys and raids, and then there are different rules anyway.