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Originally Posted by Grim Fandango
I just have one questions about aluminum pistons. You say they don't work well with aftermarket gears, but what about stock gears? Would an aluminum piston and stock gears be safe? Thanks.
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I ran an aluminum piston and stock gears all year this year. The problem with aluminum pistons and steel gears is that they are not that same hardness - The gears are harder. There will inevitably be metal-on-metal wear, and with wear you'll get metallic particles as the hard steel gears chew up the soft aluminum piston....
The best combo is still a nylon/polycarbon piston and metal (steel or TM) gears - there is always going to be wear, but would you rather have plastic paticles or metal particles floating around in your gearbox? I haven't had a problem with TM gears and an aluminum piston....yet? But I'll be stripping down my mechbox for end-of-season service in the coming weeks, so I'll update if I find significant wear....