Piston Material? 4032 or 2618?

PasSNuBye · 10-25-2005, 12:19 PM

I'm doing some research on piston design and material and came accross the option of having the piston made out of SAE 4032 or 2618.
From what I have read at http://www.pcis.net/thehook/may.htm
it seems like 4032 is the way to go. Anyone got any mor insight they could give me on which is best matrial to use between these two.

jsimon9633 · 10-25-2005, 12:23 PM

never heard of this, heard of rod material but not that

PasSNuBye · 10-25-2005, 03:50 PM

U read the info in the link? JE pistons offers pistons made in both materials. I asked CP what they used and they said 2618 so then I wanted to know what are the properties of that metal. Titanium is best I guess but between the other alloys i think 2618 is the weakest

bahamian-importz · 10-25-2005, 03:53 PM

cp is the way to go, i know a guy who used cp pistons in a 8sec civic for 3 race seasons. the exact same piston he only changed the rings.....

jsimon9633 · 10-25-2005, 03:58 PM

Cp is good so is JE so is many other companies.

forged pistons are good if tuned and done right

jsimon9633 · 10-25-2005, 04:01 PM

also from that link you can see that Custom pistons are the best way to go since off the shelf wont necessarily meet your reqs

so whether its custom JE or custom CP you shoudl go custom based off your deck height and with the features you want on there

bahamian-importz · 10-25-2005, 04:17 PM

mikestypes · 10-25-2005, 08:03 PM

2618 is what you want for maximum effort race engines, or maximum power production. 4032 is better for daily driver/weekend racer looking for low noise and great engine longevity.

2618 is stronger, but 4032 is better for anything to be used for decent life.

PasSNuBye · 10-25-2005, 08:25 PM

but from what im reading, the 2618 has less silicone which makes it a weaker metal then 4032...also as for more efficiency, if u have 2618 it expands more in heat which then requires u to have a bigger piston to bore clearance which is less efficient right?

what u want is the smallest piston to bore clearance for max effort

mikestypes · 10-25-2005, 08:32 PM

Quote:

Originally Posted by PasSNuBye

but from what im reading, the 2618 has less silicone which makes it a weaker metal then 4032...also as for more efficiency, if u have 2618 it expands more in heat which then requires u to have a bigger piston to bore clearance which is less efficient right?

what u want is the smallest piston to bore clearance for max effort

No, re-read the article. The 2618 is a denser, stronger material than 4032 becuase it has less silicone. Because of this, when heated, it expands more, thus the need for larger piston to wall clearances. Once at operating temperature, the clearances are the same. That does not matter for efficiency anyway. The piston rings do all the sealing of the combustion pressure anyway.

The piston to bore clearance all depends on combustion temperatures. The higher the temperatures, the greater the clearance required. If too tight a clearance in run, the piston will scuff, or worse, seize in the bore.

PasSNuBye · 10-25-2005, 08:45 PM

Re-Read...

Tru Tru...I guess 2618 would be better then.....That settles that for me...I'm thinking about going with CP custom or JE custom....

10-25-2005, 12:19 PM	#1
PasSNuBye ASSISTANT MASTER MECHANIC Join Date: May 2003 Location: AfghaniStizan Posts: 2,387 iTrader: (1)	Piston Material? 4032 or 2618? I'm doing some research on piston design and material and came accross the option of having the piston made out of SAE 4032 or 2618. From what I have read at http://www.pcis.net/thehook/may.htm it seems like 4032 is the way to go. Anyone got any mor insight they could give me on which is best matrial to use between these two.

10-25-2005, 12:23 PM	#2
jsimon9633 2008 Project? Join Date: Feb 2003 Location: St. Petersburg, Florida Posts: 4,258 iTrader: (5)	never heard of this, heard of rod material but not that __________________ Stock RSX Type S with K24A4 Motor, K20A2 Transmission and K20A3 Engine Harness?

10-25-2005, 03:58 PM	#5
jsimon9633 2008 Project? Join Date: Feb 2003 Location: St. Petersburg, Florida Posts: 4,258 iTrader: (5)	Cp is good so is JE so is many other companies. forged pistons are good if tuned and done right __________________ Stock RSX Type S with K24A4 Motor, K20A2 Transmission and K20A3 Engine Harness?

10-25-2005, 04:01 PM	#6
jsimon9633 2008 Project? Join Date: Feb 2003 Location: St. Petersburg, Florida Posts: 4,258 iTrader: (5)	also from that link you can see that Custom pistons are the best way to go since off the shelf wont necessarily meet your reqs so whether its custom JE or custom CP you shoudl go custom based off your deck height and with the features you want on there __________________ Stock RSX Type S with K24A4 Motor, K20A2 Transmission and K20A3 Engine Harness?

10-25-2005, 08:03 PM	#8
mikestypes Master Member Join Date: Aug 2002 Location: Calgary Posts: 1,559 iTrader: (0)	2618 is what you want for maximum effort race engines, or maximum power production. 4032 is better for daily driver/weekend racer looking for low noise and great engine longevity. 2618 is stronger, but 4032 is better for anything to be used for decent life. __________________ Mike 07 Mazdaspeed3 05 Type-S

10-25-2005, 03:50 PM	#3
PasSNuBye ASSISTANT MASTER MECHANIC Join Date: May 2003 Location: AfghaniStizan Posts: 2,387 iTrader: (1)	U read the info in the link? JE pistons offers pistons made in both materials. I asked CP what they used and they said 2618 so then I wanted to know what are the properties of that metal. Titanium is best I guess but between the other alloys i think 2618 is the weakest

10-25-2005, 03:53 PM	#4
bahamian-importz One of the 1st 500+hp k's Join Date: Oct 2003 Location: south florida Posts: 1,625 iTrader: (7)	cp is the way to go, i know a guy who used cp pistons in a 8sec civic for 3 race seasons. the exact same piston he only changed the rings.....

10-25-2005, 04:17 PM	#7
bahamian-importz One of the 1st 500+hp k's Join Date: Oct 2003 Location: south florida Posts: 1,625 iTrader: (7)

10-25-2005, 08:25 PM	#9
PasSNuBye ASSISTANT MASTER MECHANIC Join Date: May 2003 Location: AfghaniStizan Posts: 2,387 iTrader: (1)	but from what im reading, the 2618 has less silicone which makes it a weaker metal then 4032...also as for more efficiency, if u have 2618 it expands more in heat which then requires u to have a bigger piston to bore clearance which is less efficient right? what u want is the smallest piston to bore clearance for max effort

10-25-2005, 08:45 PM	#11
PasSNuBye ASSISTANT MASTER MECHANIC Join Date: May 2003 Location: AfghaniStizan Posts: 2,387 iTrader: (1)	Re-Read... Tru Tru...I guess 2618 would be better then.....That settles that for me...I'm thinking about going with CP custom or JE custom....