For hydraulic pump.

First I want to say that your text is quite confusing. I shall try only to give you some directions to work by your own:

If you have a piston with 2 areas and if you apply a pressure on one of them you transmit to the other a force equal to the product between the pressure you apply and the area on which it is applied. On the other side you will obtain a pressure equal to the above mentioned force minus the seal frictions and any other friction and divided by the second area.

If you want to get a pressure 2x bigger, the second area has to be 1/2 of the first. In fact due to the frictions it has to be slightly less than 1/2 of the first. I do not know if you have seals and if you have which kind so that it will be your problem to determine the friction and the correction in the areas ratio.

In order to get a good answer please try to explain your problem as clear as possible.

Erm, yep, I did read your post last time. Presumably the replies you had then did not answer your problem.

Look, I might be able to help here, but can you put your question another way?

For instance, you could state the facts as simple statements first, then state your question. That sounds easy, but, forgive me for saying so, it seems to be a bit difficult for you. Maybe you can reduce the problem to an incomplete formula and let readers fill in the missing functions. What do you think? Can you post a drawing?

Just out of interest, what is your native language? Your written style is very unusual - I think the problem would be clearer if you could separate the issues into small packets. In English, and in science in particular, the sentence is best understood if it is short and concise. Many clear sentences can build up to a complex but comprehensible idea. (But not with Creationism.)

Good luck.