i'm wondering if someone tried and tested lightweight ergal pulleys.. the auxiliary pulleys are very heavy and the gain in weight switching from iron to aluminium is huge.
i'm referring also to the double pulley in front connected with aircon/alternator, it's heavy like the hell if i'm not wrong there was a kit on ebay but right now isn't available
Its not all about weight, also very important is to make it smaller (underdrive pulley) as there is waste of engine power in rotational speed which is not required, as ferrarist stated above... I made my pulley from renault engine F4R 8v, 22mm smaller in diameter, works like a charm, even ac is cooling fine...