Drive idler pulley and drive tensioner pulley idea. Doable?

[petrified.rabbit]

You have to realize a metal pulley failure is just as likely as a plastic pulley failure. I would take a plastic pulley with good bearings over any type of metal pulley with poor bearing quality.

to gothstone, the aluminum pulleys will be heavier than plastic = power loss.

The diameters of the pulleys do matter. The belt is a set size. It will not "jump time" but if you change the riding distance between the pulleys you need to change the belts length to reflect those changes. There is no gain in this for you.

The sheep as you put it like engines that run. I doubt you have the knowledge base to improve on factory timing belt design. You might be able to get it to run, but a lot of unnecessary work for what gain? 63k miles instead of 60k if your lucky? catastrophic failure more likely.

if your driving style impacts the engine so hard that you need to replace the timing pulleys to aluminum, maybe you should research reality first. Or spend your money on driving lessons.

I don't usually post anything but helpful advice. But all you are doing is creating a unreliable time bomb, if it will even run on start up.