christi
Top Post Dawg
I was just doing some dreaming here...
Pistons from a 1Z motor are 79.5mm diameter.
Pistons from a five cylinder 2.5 TDI (AAT) are 81mm diameter.
Early 1Z and AAT both use the same part number for the circlip (that holds rod pin in piston).
So maybe an AAT piston could fit on a 1Z conn rod...
Now, going from 79.5mm to 81mm is a 3.80% increas in surface area.
That takes a 1Z motor from 1896cc up to 1968cc.
Unanswered questions:-
1. Will an AAT piston fit on a 1Z conn rod?
2. Is an AAT piston shorter or taller than a 1Z piston? If its a little shorter then we might be able to reduce compression ratio too
3. What other rods might fit? The bearing shell for the big end are different though...
What we need is a piston from a scrapped Audi 100 TDI to compared with a 1.9 TDI.
Pistons from a 1Z motor are 79.5mm diameter.
Pistons from a five cylinder 2.5 TDI (AAT) are 81mm diameter.
Early 1Z and AAT both use the same part number for the circlip (that holds rod pin in piston).
So maybe an AAT piston could fit on a 1Z conn rod...
Now, going from 79.5mm to 81mm is a 3.80% increas in surface area.
That takes a 1Z motor from 1896cc up to 1968cc.
Unanswered questions:-
1. Will an AAT piston fit on a 1Z conn rod?
2. Is an AAT piston shorter or taller than a 1Z piston? If its a little shorter then we might be able to reduce compression ratio too
3. What other rods might fit? The bearing shell for the big end are different though...
What we need is a piston from a scrapped Audi 100 TDI to compared with a 1.9 TDI.