making a 2 liter, Cylinder Question Options

[malcolm2]

I plan to buy new 94mm dished pistons for my bus project. AA has the set for $250.

They also have just the pistons for $140. Should I consider having the 1.8 cylinders done to accept the 2.0 pistons?

Not sure about the cost yet. The shop I planned to go to has been closed for the Holidays. So his charges might answer my question.

But what does the group think? Especially the Bus people. They have recommended going with the 2 liter vs the 2056. So here I am with more questions... (IMG:style_emoticons/default/piratenanner.gif)

Would the stock, honed 1.8 cylinders (unknown mileage) be better than new from AA?

[Miguel K R]

With 94mm diameter pistons and cylinders, if you use the 2L crank (and the corresponding rods) with the 71mm stroke you will have a displacement of 1971cc (the displacement of the standard 2L).

You mention that you are considering a set of pistons from AA and in that case you will get a reasonable compression ratio. When these were not available the choice was between the cylinders and pistons of the 2L VW Bus, which have a low compression ratio (and lead to a low power) or the considerably more expensive cylinders and pistons of the 2L 914. Another alternative was to buy a set of 94mm pistons and cylinders for a VW Type 1, re-bush the Type IV 2L rods from 24 to 22mm, and use these pistons with used honed 2L 94mm cylinders from a Type 4 engine. This way you were able to get a high compression 2L without the extra cost of a set of 914 cylinders and pistons.

If you stick to the 1.8L crank and rods, you have a stroke of 66mm and a piston diameter of 93mm (displacement of 1793cc). If you change to 94mm pistons you increase the displacement to 1832cc . This is reasonable using the 1.8L cylinders (when you enlarge from 93 to 94mm diameter, you are removing just 0.5mm per side).
On the other hand 96mm pistons lead to a displacement of 1910cc but I would not recommend at all enlarging the 1.8L cylinders from 93 to 96mm as the walls would be too thin.
In this case you would have to buy pistons plus cylinders from AA for 381.95USD : https://aapistons.com/collections/vw-piston...der-kit-914-bus

NOTE : 96mm pistons and cylinders, with a 71mm stroke 2L crank and rods, correspond to a displacement of 2056cc

Of course, it is tempting to obtain a larger displacement, but you have to invest in a 2L crank and Rods, and have the crankcase and heads enlarged to match the larger cylinders.

Miguel

[TargaToy]

NOTE : 96mm pistons and cylinders, with a 71mm stroke 2L crank and rods, correspond to a displacement of 2056cc

Of course, it is tempting to obtain a larger displacement, but you have to invest in a 2L crank and Rods, and have the crankcase and heads enlarged to match the larger cylinders.

Miguel

Are you positive about this last statement? Any Type IV case as well as the 1.8L heads should accept 96mm jugs with no machine work.