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bob27s -> RE: Jett ABC/AAC (7/30/2007 7:54:12 PM)
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In general, the two perform the same. They wear about the same too.
The AAC costs a bit more usually, but the trade off is that the sleeve is lighter (AL vs Brass )
AAC also 'can' have a performance advantage. More equal expansion due to heat. Dub has actually come up with a very unique way to take advantage of this, and for the lower rpm engines (CL engines , BSE76L, BSE100L, etc) can provide better midrange and throttle response ---- engine can be built differently and runs "looser". In effect, they run more like a ringged engine, but have all of the ABC type benifits.
Run properly, the AAC 'can' outlast the ABC. But that is very hard to quantify, so take that with a grain of salt.
On the high-speed engines..... pretty much a toss-up since folks do not tend to run a great deal in midrange.
Bob
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