2.2T rebuild - light hp/torque little improvement

[1974phil]

Hi Everyone,

Assessing the parts while tearing down my 2.2t Engine, I had to conclude that my original "O" pistons are out of tolerance 83.90mm-83.92mm vs 83.97mm

The original non counterweighted crank is within specs 56.975-56.98mm on the main journals and rod journal are all at min. 56.98mm, crankshaft to flywheel bearing is at 64.99mm.

Now, as I have to change the pistons and cylinders, I am considering to use AA pistons 84mm set. I have used AA pistons for my hi-po VW typ 1 engines with no issue (200hp), albeit forged ones, and I am not sure that the price difference for a basic Mahle set is worth the money.

I know that hypereutectic pistons are better than forged pistons for pure street driving in terms of longevity for low power engines.

With the "basic" low comp hypereutectic kit from AA with 84mm pistons and 66 mm Crank you match the original CR of 8:5 - 8.6 :1.

There is also a hi comp hypereutectic kit for 84mm pistons and with the 66mm you reach 9.1:1 CR.

I was wondering if anyone has used this last kit, with the 2.2 T cams/heads and what would be the outcome in HP and torque values.

Perhaps, switching to "E" cams could be worth it. Although my T cams look fine (haven't measured the runout yet).

I will keep my Zenith 40 TIN carbs and really I am by far not looking for "s" specs.


What is your view about these little changes vs. original specs (mostly meaning the High po pistons/cylinder set). Would I reach ca. 140hp from the 2.4T ?

Before considering the AA set, if anyone has used them lately I would be most interested in a feedback in terms of out of the box measurements.

Thanks for you help !

Phil