well as i suspected the motor was rebuilt, you can still see the cross hatch perfectly on each cylinder as with the pistons saying .30 on each one. question is, how do i tell if it was forged, cast or hyper? i can pretty much rule forged out i'm guessing, but what about hyper ? as a lot of rebuild kits come with hyper anyway - someone said i can take the pan off and look at the underside of the piston ?

 

Why don't you just call the company and ask them? I'm putting my money on cast.

 

what company?

i wouldn't put 'em on cast, they're much too shiny to be cast plus from all the other items this motor had/has on it i doubt they stuffed casties back in. :|

 

The company that rebuilt it? Sorry, but I don't know the history of your car/engine - you have to let me know more.

 

hyper? what the heck is a hyper piston?

 

Hypereutectic. It refers to the metallurgical properties of specificalloys. In the case of pistons, you get a material that's stronger than cast aluminum, but lighter and cheaper than forged. The downside is that they're fragile and can shatterwhen subjected to detonation. They're a great option for a performance street engine that won't see any power adders.

 

Thanks, i've been out of the "hi-po" world for a few years now. Gt it, they're metallurgicaly enhanced aluminumcastings.

 

I think he means a hypereutectoid piston...If I remember correctly, a hypereutectoid is when Fe-Fe3C contains around .75 to 2% Carbon, and it heated to the Austenite phase (anywhere from 700-1100 degrees Celcius) and then is cooled down to room temperature. I can't remember if there is a middle phase, but I know at least that they cool it to below 723 *C

Dangit Starfury, you beat me to it

 

Negative, hypereutectic. Aluminum and silicon are the alloying elements in this case.

http://en.wikipedia.org/wiki/Hypereutectic_piston

That just about covers it

 

good job men!