Imh0TeP
20+ Year Contributor
- 35
- 2
- Dec 26, 2002
-
Caguas,
Puerto_Rico
After a failure of 2 JE pistons in my ride I decide to learn about "what was going on in there" the trust on Tuners is a big issue. But that is another history.
I decide to search and ask to the experience ones about pistons, but in a deep perspective about which alloy will be "the one" we must consider depending on our goals on the street or track. Money is not considered at this time because the range of cost between this 2 alloys. Horse Power/boost in range of 400hp or +15lb boost. Goal "Street Dary Driven punched gas several times a day"
Which one? Is logical always to look 2618 because its strength, But! if are bad bored or wrong cylinder/wall gapped will have more risk to fail premature, because the alloy expands a more and will be near or touching the cylinder wall on simple terms... the 4032 that one many said the cheaper is "more rigid" because the 11% more silicon alloy that avoids to expand, and many brands have it coated.
If a car is on dairy drive will heat-expand / contract-cooled so what choice? Virtues and risks. -What don't do-? Or what to do with witch one?
The 2618 FORGED ALUMINIUM ALLOY (JE,ROSS,WISECO,CP,ARIAS)
The 4032 FORGED ALUMINIUM ALLOY (ARIAS,MAHLE,SRP)
Here is Another Information about Piston Coatings, Gaps, Bores, and diferences on 2618 and 4032 alloys:
http://www.aa1car.com/library/2005/eb60522.htm
http://www.jepistons.com/dept/tech/d...instrc4032.pdf
http://www.jepistons.com/dept/tech/d...instrc2618.pdf
Thanks Guys For your time.
__________________
I decide to search and ask to the experience ones about pistons, but in a deep perspective about which alloy will be "the one" we must consider depending on our goals on the street or track. Money is not considered at this time because the range of cost between this 2 alloys. Horse Power/boost in range of 400hp or +15lb boost. Goal "Street Dary Driven punched gas several times a day"
Which one? Is logical always to look 2618 because its strength, But! if are bad bored or wrong cylinder/wall gapped will have more risk to fail premature, because the alloy expands a more and will be near or touching the cylinder wall on simple terms... the 4032 that one many said the cheaper is "more rigid" because the 11% more silicon alloy that avoids to expand, and many brands have it coated.
If a car is on dairy drive will heat-expand / contract-cooled so what choice? Virtues and risks. -What don't do-? Or what to do with witch one?
http://www.carcraft.com/techarticles...ng_technology/Forged pistons are generally made from one of several different aluminum alloys, with each offering different benefits depending on the application. The two most popular alloys are 4032 and 2618. Speed-Pro typically uses VMS-75, which is fairly close to 4032—both contain about 11 percent silicon, which helps with ring groove and skirt durability. These are the best choice for applications expected to have decent longevity, such as street vehicles and entry-level bracket racing and oval track combos. Although 2618 has better high-temperature characteristics, it contains virtually no silicon. This material expands and contracts more, so greater bore clearances are needed to prevent scuffing. Pistons using 2618 are best suited to nitrous, blowers, or higher end race applications where frequent inspection and replacement are not a problem
The 2618 FORGED ALUMINIUM ALLOY (JE,ROSS,WISECO,CP,ARIAS)
(http://www.carcraft.com/techarticles...ng_technology/)Pistons using 2618 are best suited to nitrous, blowers, or higher end race applications where frequent inspection and replacement are not a problem.
(http://www.stealth316.com/2-pistonguide.htm)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.
(http://en.wikipedia.org/wiki/Hypereutectic_piston)The "2618" performance piston alloy has less than 2% Silicon and could be described as Hypo (under) eutectic. This alloy is capable of experiencing the most detonation and abuse while suffering the least amount of damage. Pistons made of this alloy are also typically made thicker and heavier because of their most common applications. Because of the higher than normal temperatures these pistons experience in their usual application, and also the low-Silicon content allowing the maximum possible Aluminum heat-expansion, these pistons have their cylinders bored to a very loose cold-fit. This leads to a condition known as "piston slap" which is when the piston rocks in the cylinder, and it causes an audible tapping noise that continues until the engine has warmed to operational temperatures. These engines should not be revved when cold, or excessive scuffing can occur
The 4032 FORGED ALUMINIUM ALLOY (ARIAS,MAHLE,SRP)
(http://www.carcraft.com/techarticles...ng_technology/)These are the best choice for applications expected to have decent longevity, such as street vehicles and entry-level bracket racing and oval track combos.
(http://www.stealth316.com/2-pistonguide.htm)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
(http://en.wikipedia.org/wiki/Hypereutectic_piston)The "4032" performance piston alloy has an approximate Silicon content of 11%. This means that it expands from heat less than a piston with no Silicon, but since its eutectic level of Silicon is fully alloyed on a molecular level, this alloy is less brittle and more flexible than a stock Hypereutectic "smog" piston. These pistons can survive mild detonation with less damage than stock pistons.
(http://www.svtperformance.com/forums...d.php?t=181225)Another option for a daily driven vehicle that isn't going to see over 10 psi, is MAHLE. They are a well known german manufacturer that makes piston for Ferrari and F1 teams. Very well designed and quality made piston, but unfortunately they are made from 4032 alloy, which isn't as strong as the 2618 that the other brands are made from.
Here is Another Information about Piston Coatings, Gaps, Bores, and diferences on 2618 and 4032 alloys:
http://www.aa1car.com/library/2005/eb60522.htm
http://www.jepistons.com/dept/tech/d...instrc4032.pdf
http://www.jepistons.com/dept/tech/d...instrc2618.pdf
Thanks Guys For your time.
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