Muscular Mustangs - View Single Post - 1993 Cobra; good or bad?
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post #5 of Old 03-04-2005, 04:32 PM
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Originally Posted by Jim
Originally Posted by Anonymous
why not 1993?

I think quick5pnt0 said "1989-1992" because 1993 Mustangs had cast hypereutectic pistons in it's engine while the years before had forged pistons. Hypereutectic pistons are great for few reasons such as tolerances can be set closer, they are lighter, and cheaper. Problems with them is that they are weaker than forged pistons and don't hold up well to the stress of nitrous or supercharging.
I once talked to a Pro 5.0 driver who is also the parts manager at a Ford dealer who said Hyper pistons can withstand supercharging and nitrous but if you experience any, no make that ANY detonation the hyper pistons will be destroyed very quickly. Basically you need to run those with a very mild tune, and very rich (lots of fuel in the air fuel ratio).

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