I am building an engine for my '88 Coupé Quattro 20V, i bought an extra engine so i can take all the time i need.
Cillinder head i have allready done (20 valves is a lot off work ) and now i am beginning to work on the rest off the engine.
The plan is;
New pistons, i bought a set Mahle, bore will be 83.01
New bearings for pleuel and crank.
And off course, making everything as clean as possible.







Beqause its the first time for me doing this kind a work a have a few questions.

Piston to bore clearance should be 0.03 according to Mahle, i believe it is a bit tight or is it oké?
Oil, what kind of oil? i read here that 5W50 is oké, but is it oké for a "new" engine?

Greetings, Mario.

Correct, i believe the bore should be 83.01, it is written on the pistons.
82.98 sp 0.03

Is the Mobil 1 oil full synthetic?

New cilinder bore: 83.01mm, upperside is flat (how do you say that in english? ) and the cilinder block is cleaned.
I am waiting for the other parts like crankshaft and connecting rod bearings and some other parts.
I am planning to renew the connecting rod bolts but i do not know if it is necessary.

Oké, i noticed that the bolds are pretty tight in de rod, is there a special way to get them out?

Is there a way to take this out?
I want to give it a color and then make it back in.

Panic!
i don't know the position of the connecting rods each rod has two "bumps" i marked on the picture.
Are the bumps on the "oilfilter side' or the other side?

Is the position of the main bearing caps oké and can i put these bolts back in?

I made a lot of pictures while reassembling the engine but i did not check if they were oké.

Oké, and what do you think about the main bearing caps? In my opinion this is the only way to put them in.

Oké, thank you.
I have a question about the end gap position of the piston rings, i can't find anything about it in my documentation.
Do the rings turn around the piston while running?
In what position wil i set them if i put the pistons in the cilinder, end gaps to the inlet ,exhaust or pointing to the timing belt?