I'm rebuilding my 305, and am going to use a 100 shot of nitrous. I really do not trust the stock cast pistons... and forged are much more money. I don't really know much about the hypers... i've heard some people say they're great and others say they can melt

Does anyone have any real world experience with them? I know you wanna tell me "spend the extra money for the forged", but it's easier said than done, I don't HAVE the extra money! Will these hypers get the job done?

 

Notrous is like a game. If you follow all the rules, set things up proper, and dont cut corners you will have predictable results.

Are you going to be running it on a stock motor?

I personally would not run nitrous unless I was able to first inspect the pistons and rings, inspect the combustion chambers in the heads for burrs and hot spots along with a light port and polish job of the chambers for added insurance, know for a fact that I had enough fuel to support the system at the rail, and have a chip with some timing pulled out of it.

But that is just me, alot of other people just spray away, but the results arent always predictable.

About the Hypers:
http://www.kb-silvolite.com/page14.htm

 

Even though it's a hypereutectic silicon/aluminum alloy, it's still a casting. I'm a little old-school, but I'd tend to avoid any kind of power adder with cast components - except maybe on a turbo-diesel.

 

for a power adder you need forged pistons, along with forged rotating assembly, unless you don't mind breaking parts and stating over. if the cost of forged parts is out of your range skip the power adder and run cast/hyper parts and you shouldn't have any problems.

 

Ditto both of those guys. THose pistons are very hard, and consequently brittle; they shatter relatively easily as a result of detonation, which is a frequent problem that happens with nitrous. Also, the metal is an excellent insulator, which makes the top of the piston retain heat, which makes the top ring rn hotter than normal, which makes it expand more than usual, which makes it very easy to have too little ring gap; and when the ring ends butt together from expansion, it's instant piston death.

Use forged. Do it right and don't cut corners, otherwise you'll be yet another person on this board with a sad "It just blew up without warning at about 1000' " story.

 

Listen to these guys! Go ahead with the forged pistons and if you don't have the money, wait for the nitrous. I agree that you will be sorry if you don't use forged. I think there has been enough said about why!

 

Well... I guess I'll just put the buildup on hold till I can afford the forged. Thanks guys

 

I know it's difficult to hold off on something like that, but I think you'll be glad you did! It took me 3 years to get my engine into my car because I wanted it to be "just right". It doesn't run to it's full potential yet though, I need to do work on the exhaust, transmission, and other stuff before I can get close to where it WILL be!