Strongest shelf forged piston for turbo 402"?
05-24-2006, 12:48 PM
#1
Strongest shelf forged piston for turbo 402"? I think my mind is mostly made up with some really nice Wiseco shelf 4.000" 2618 alloy -32cc (8.5:1) pistons (About $518 plus rings cheapest ive found)....
but I am one to never pass up a better offering if there is one is available.
Is there a stronger/better built for 1000hp+ shelf (non-custom) 4.00"x4.00" piston available in reasonably same price range...
but I am one to never pass up a better offering if there is one is available.
Is there a stronger/better built for 1000hp+ shelf (non-custom) 4.00"x4.00" piston available in reasonably same price range...
05-24-2006, 02:05 PM
#3
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there will be a bunch of different opinions on piston strength.je has been around for a long time,the coated mahles are strong and i'm sure the wisecos are up there as well. keep it nice and fat and most of the players will hold up under pretty big power numbers.
05-25-2006, 11:27 AM
#6
Mahle's are good stuff (and youll see I am selling a set of new 4.000" bore Mahles actually in FS section)...
But mahles are made from 4032 alloy which works great in street motors and nice for lots of mileage and long life. The problem is once you reach approx 1000hp+ they become the weak link with 20+ psi boost on them. 4032 scatters and will not survive like a 2618 alloy piston. The wisecos and diamond turbo pistons are 2618 alloy.
Does any know if there are any other brand shelf pistons that have a better ring stack or crown thickness etc than the Wisecos? I think the wisecos will life up above 1000hp with no problem but I want to make sure I chose right the first time.
But mahles are made from 4032 alloy which works great in street motors and nice for lots of mileage and long life. The problem is once you reach approx 1000hp+ they become the weak link with 20+ psi boost on them. 4032 scatters and will not survive like a 2618 alloy piston. The wisecos and diamond turbo pistons are 2618 alloy.
Does any know if there are any other brand shelf pistons that have a better ring stack or crown thickness etc than the Wisecos? I think the wisecos will life up above 1000hp with no problem but I want to make sure I chose right the first time.
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05-25-2006, 01:41 PM
#11
There are two common alloys used in forged pistons, 4032 and 2618. Silicon-aluminum alloys, such as 4032, have great wear characteristics because the silicon particulate hardens the alloy and reduces the thermal coefficient of expansion. However, silicon-aluminum alloys can turn brittle and become prone to fracturing when subjected to extreme stress. With a piston made of a silicon alloy once a crack starts, it doesn't stop until the piston suffers a catastrophic failure. Low- or no-silicon alloys, such as 2618, may wear a bit faster but provide better strength and durability. In the rare case of a crack in a 2618 piston, the crack will migrate to an area of lower stress and stop. 2618-alloy pistons keep their shape under extreme pressures and high RPM's.
2618-alloy will live fine 50k+ miles but might not be a 100k mile piston like a 4032.
The 4032 alloy is most often used for pistons in street engines, drag engines, naturally aspirated engines and many sportsman class circle track engines. The 4032 alloy contains more silicon (11 to 13.5 percent) than 2618 (less than 0.25 percent), which reduces thermal expansion, improves lubricity and scuff resistance. The 2618 alloy, by comparison, is a low silicon alloy so it has a higher coefficient of thermal expansion and much more tendency to scuff. But it is about a 10-15 percent stronger material and is typically the alloy of choice for serious racing, marine engines, and boosted and bottle-fed engines that produce a lot of heat in the combustion chamber.
Mahle 4032's (which i have a set i am going to sell and get a 2618 alloy) will work GREAT probably up to about 1000 flywheel horsepower...
But the Wiseco will be great in a 20+ psi high horsepower motor...and im going to go that route unless someone knows of another options that is better for any reason.
2618-alloy will live fine 50k+ miles but might not be a 100k mile piston like a 4032.
The 4032 alloy is most often used for pistons in street engines, drag engines, naturally aspirated engines and many sportsman class circle track engines. The 4032 alloy contains more silicon (11 to 13.5 percent) than 2618 (less than 0.25 percent), which reduces thermal expansion, improves lubricity and scuff resistance. The 2618 alloy, by comparison, is a low silicon alloy so it has a higher coefficient of thermal expansion and much more tendency to scuff. But it is about a 10-15 percent stronger material and is typically the alloy of choice for serious racing, marine engines, and boosted and bottle-fed engines that produce a lot of heat in the combustion chamber.
Mahle 4032's (which i have a set i am going to sell and get a 2618 alloy) will work GREAT probably up to about 1000 flywheel horsepower...
But the Wiseco will be great in a 20+ psi high horsepower motor...and im going to go that route unless someone knows of another options that is better for any reason.
Last edited by stang90gt50; 05-25-2006 at 01:51 PM.
05-26-2006, 06:46 PM
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Originally Posted by stang90gt50
There are two common alloys used in forged pistons, 4032 and 2618. Silicon-aluminum alloys, such as 4032, have great wear characteristics because the silicon particulate hardens the alloy and reduces the thermal coefficient of expansion. However, silicon-aluminum alloys can turn brittle and become prone to fracturing when subjected to extreme stress. With a piston made of a silicon alloy once a crack starts, it doesn't stop until the piston suffers a catastrophic failure. Low- or no-silicon alloys, such as 2618, may wear a bit faster but provide better strength and durability. In the rare case of a crack in a 2618 piston, the crack will migrate to an area of lower stress and stop. 2618-alloy pistons keep their shape under extreme pressures and high RPM's.
2618-alloy will live fine 50k+ miles but might not be a 100k mile piston like a 4032.
The 4032 alloy is most often used for pistons in street engines, drag engines, naturally aspirated engines and many sportsman class circle track engines. The 4032 alloy contains more silicon (11 to 13.5 percent) than 2618 (less than 0.25 percent), which reduces thermal expansion, improves lubricity and scuff resistance. The 2618 alloy, by comparison, is a low silicon alloy so it has a higher coefficient of thermal expansion and much more tendency to scuff. But it is about a 10-15 percent stronger material and is typically the alloy of choice for serious racing, marine engines, and boosted and bottle-fed engines that produce a lot of heat in the combustion chamber.
Mahle 4032's (which i have a set i am going to sell and get a 2618 alloy) will work GREAT probably up to about 1000 flywheel horsepower...
But the Wiseco will be great in a 20+ psi high horsepower motor...and im going to go that route unless someone knows of another options that is better for any reason.
2618-alloy will live fine 50k+ miles but might not be a 100k mile piston like a 4032.
The 4032 alloy is most often used for pistons in street engines, drag engines, naturally aspirated engines and many sportsman class circle track engines. The 4032 alloy contains more silicon (11 to 13.5 percent) than 2618 (less than 0.25 percent), which reduces thermal expansion, improves lubricity and scuff resistance. The 2618 alloy, by comparison, is a low silicon alloy so it has a higher coefficient of thermal expansion and much more tendency to scuff. But it is about a 10-15 percent stronger material and is typically the alloy of choice for serious racing, marine engines, and boosted and bottle-fed engines that produce a lot of heat in the combustion chamber.
Mahle 4032's (which i have a set i am going to sell and get a 2618 alloy) will work GREAT probably up to about 1000 flywheel horsepower...
But the Wiseco will be great in a 20+ psi high horsepower motor...and im going to go that route unless someone knows of another options that is better for any reason.
