2.5l upgrades for the NA I5

[Jörgen Karlsson]

Hi,

A set of custom made JE pistons is one way to do it.

On a MC1 piston the pin cannot be moved upwards high enough because of the
oil ring. But on a n/a engine all three rings could probably be moved up a
few milimeters, maybe they are placed higher already. I have seen pistons
where the top of the pin is higher then the center of the oil ring.

Jörgen Karlsson
Gothenburg, Sweden.



Mihnea Cotet wrote:

> Hi guys!
>
> I've just done some mathematics and geometry today to see if a 2.5 crank
> coud fit in a 2.3 block.
> This 2.5l engine uses a 82.5 mm bore size with a 92.5 mm stroke.
> As opposed
> to the 86.4 stroke for the 2.3.
> The problem that resulted was that either the stock block is 5mm
> too short
> to accomodate for the longer stroke or stock rods are 5mm too long.
> The distance between the holes in the stock rods is 159 mm for
> both engines.
> What could be the solution?
> Cutting/rewelding the rods? "Prolongate" the block? The latter
> seems pretty
> much like Sci-Fi :))!!!