Piston rings- file fit or no for a stock 440?

[joe smith]

I seeeee! Well, too much hocus pokus with Hypereutectic pistons! I'm old school
and will stick with the forged units. Thanks for "Splainin!

As my machinist said when we did my last engine, " they are still CAST pistons".

 

[dvw]

Hypereutectic can run at very close piston to wall. They are cast. But the similarity ends there. They are great for low noise, long wear, and toughness. Like anything else. Follow the instructions. We've used KB's with no issues. Even used them in my sons 11 second 340 Duster street car. Engine building is more than throwing the parts in the hole and tightening the bolts.
Doug

 

[RJRENTON]

Hypereutectic can run at very close piston to wall. They are cast. But the similarity ends there. They are great for low noise, long wear, and toughness. Like anything else. Follow the instructions. We've used KB's with no issues. Even used them in my sons 11 second 340 Duster street car. Engine building is more than throwing the parts in the hole and tightening the bolts.
Doug

Personally, I'm not a fan of Hyperutechtic pistons. For the dollar difference between hyperutechtic and forged pistons ill opt for the forged pistons. The silicon referred to in hyperutechtic pistons is silicon carbide, which makes them harder....just like the old GM 2.3L Vega engine blocks and the Briggs snd Stratton lawnmower engines....both tun without bore liners, aluminum pistons running in aluminum bores due to the high silicon carbide....in fact, B&S engines ran a specific alloy called Briggs 12 alloy (12% silicon carbide). I use to work for the company that made the alloy, in Milwaukee Wisconsin, and delivered the MOLTEN METAL alloy to B&S from Oak Creek Wisconsin about 50 miles away.
BOB RENTON

 

[dvw]

Personally, I'm not a fan of Hyperutechtic pistons. For the dollar difference between hyperutechtic and forged pistons ill opt for the forged pistons. The silicon referred to in hyperutechtic pistons is silicon carbide, which makes them harder....just like the old GM 2.3L Vega engine blocks and the Briggs snd Stratton lawnmower engines....both tun without bore liners, aluminum pistons running in aluminum bores due to the high silicon carbide....in fact, B&S engines ran a specific alloy called Briggs 12 alloy (12% silicon carbide). I use to work for the company that made the alloy, in Milwaukee Wisconsin, and delivered the MOLTEN METAL alloy to B&S from Oak Creek Wisconsin about 50 miles away.
BOB RENTON

What type of piston do you think a LS or Gen 3 Hemi have? And we all know that nobody runs boost on stock short blocks.
Doug

 

[RemCharger]

What type of piston do you think a LS or Gen 3 Hemi have? And we all know that nobody runs boost on stock short blocks.
Doug

Exactly ,they're good if they're set right. They're just different from other pistons and that's where people screw up.

 

[joe smith]

I had to file all of the piston rings in my last build, a 302 ford engine...
Its alot of work as you will spend time fitting each ring set to each hole multiple time.. Between each filing I had each ring in the solvent tank to remove any dirt or metal bits..... Lots of time and " putting on and removing" solvent tank gloves...

 

[joe smith]

What type of piston do you think a LS or Gen 3 Hemi have? And we all know that nobody runs boost on stock short blocks.
Doug

Not just those but trillions of stock engines built that last alot of miles on stock cast pistons........
I plan on only doing this once and for how expensive everything is, upgrading to forged pistons is minimal.....

 

[dvw]

Forged are a great race piston. But for street use they run looser. More noise and wear. That being said not all forgings are the same either. Good high quality strong alloy forgings are well over $1000. I run them as well. I also run .9mm stainless file fit rings. Does every application need these type of parts? No. Use the right part for the right application. For the original poster Hypers would be an excellent choice.
Doug

 

[mgoblue9798]

I seeeee! Well, too much hocus pokus with Hypereutectic pistons! I'm old school
and will stick with the forged units. Thanks for "Splainin!

Another factor is how high up on the piston the top ring land is on the KB's. Lots of hypereutectic pistons used by OEMs including in the 5.2/5.9 magnum engines. Haven't seen any problems from those.

 

[Go mango]

O.K., so humor me. The ring is installed in the cylinder and the ring gap is determined by
the diameter of the bore. In this case it would be around 0.016 gap with the temperature
at 72 degrees. As everything heats up, the bore expands, and so does the ring. The compression
ring gets the hottest because it's closest to combustion, but what does the material of the piston
have on the ring gap? The ring does not fit tightly on the piston, it has radial clearance. The
only way a ring can sieze up and rip the top land off is if the ring gap is too small. So, 'Splain
it to me Ricky!