Re: Re: Motor Choice confusion Reigns....
 

http://www.shopatron.com/product/pro...LC12PRO3/167.0

Hope that helps ... seems like a really awesome engine and very good price ... L8r :cool:

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?

JP FX
 

[B]decision made ..... arrives tomorrow ....
1.) JP FX12 T-03 (Turbo EFRA) with ceramic bearing and hardblack crank coating .......

Good choice,run it in well and you want be disappointed.

I have heard that when the piston and liner material is AAC it does shorten the life of the motor. I even heard that you can't replace and AAC piston and liner??? Not sure about that .......

However AAC does give better heat dispersion than ABC.....

However AAC does give better heat dispersion than ABC..... [/B][/QUOTE]

The expansion and contraction of the piston and sleeve are the
same given the same material.
Therefore less compression loss once at operating temperatures.

The expansion and contraction of the piston and sleeve are the
same given the same material.
Therefore less compression loss once at operating temperatures. [/B][/QUOTE]
but how does that result in shorter piston and liner life?

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.

AFM

I have found AAC to be good once it is at running temp. When I got a Sirio for the first time I had no end of trouble because I was turning the needles too soon. Now I know what I am doing I have been won over. The power is great & they seem to hold a tune very well & no problems at idle. This is even with the evo 1 composite carb. Now all I need is RB to offer an AAC version:D