Originally posted by Team-RTR
they seem to be ultra fast, but the only thing im iffy about is the fact that the piston and liner material is AAC, which if im not mistaken lasts only a very very sort time before a rebuild is needed, can anyone verify this?
They are extremely fast!!
My M.Collari AAC engine is lasting me more than my ABC Sirio.
After six races it is still very tight and with perfect compression.
The catch with AAC is proper carburation. Since it takes more time to warm up, most people make mistake of tuning carb when engine not at right temp, so they tend to overlean engine.
AAC liner is hard chromed in inside the same as an ABC, so wear is the same, if properly carburated.
Yes you can replace AAC p/s. You can even replace it with a regular Sirio ABC. It's the same procedure, only difference is construction material.
The advantage of AAC p/s is that AAC sustains better high rpm, high temp operation, without loosing compression. Aluminum is a better heat conductor.