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2G SRP Pro Pistons

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Mham2k

15+ Year Contributor
306
57
Feb 8, 2008
Dallas, Texas
I purchased a new built block from a guy on the forum and have a slight problem, my goals are 700-800hp.

Called Eagle they said the rods are good for 900.

Called JE, they said the SRP Pros are good for 450hp because they are the 4032 not the 2618 material.

Question's
- Has anyone had any experience with these pistons?

- Is the 4032 really that bad, can it handle more than they say? 600?
--- Ivebeen running stock cast pistons at 400 with meth at 27psi a while now with no issues.

- Wiseco looks like they have some pistons that are the same bore and clearance, the bore is fresh and hasn't been run on this engine so I should be able to hone and drop in?

Thoughts?
 
Last edited:
Maybe, but you will only have that answer after you measure or have somebody competent measure everything, forged pistons require additional clearance and that differs brand to brand and part number to number, same with rings.
 
Maybe, but you will only have that answer after you measure or have somebody competent measure everything, forged pistons require additional clearance and that differs brand to brand and part number to number, same with rings.

Any thoughts on the 4032 material?
 
Not sure, but probably is talking about cylinder wall clearances and piston expansion, so keep it tight.
Here is JE's own quote
"A 2618 piston will expand 15 percent more than a 4032 version. This, as we’ve mentioned, is the reason a 2618 piston requires more clearance and as a result will be slightly noisier when cold as opposed to a comparable 4032 forging."

Coming from this article:
http://blog.jepistons.com/2618-vs.-4032-material-differences
 
Not sure, but probably is talking about cylinder wall clearances and piston expansion, so keep it tight.
Here is JE's own quote
"A 2618 piston will expand 15 percent more than a 4032 version. This, as we’ve mentioned, is the reason a 2618 piston requires more clearance and as a result will be slightly noisier when cold as opposed to a comparable 4032 forging."

Coming from this article:
http://blog.jepistons.com/2618-vs.-4032-material-differences

Thanks, can anyone tell me if the 4032 are really that weak?
 
Rattle = detonation.

Why don't you look up the 2 alloys and see what the differences are in yield strength, it's, and ductility.

I did look it up but can't find many people using the 4032 anymore but the few companies that do like Mahle, then on the other hand companies like JE moved completely away from it while Wiseco still makes both.

I can't find anyone online anywhere that has broken a 4032 but everyone talks down about them...

Trying to find someone that has actually used them so i really no what they can handle, I see a lot of hear say online.
 
4032 is high silicon, 2618 is low silicon. The silicon content affects its thermal expansion rate, so 2618s need larger piston-to-cylinder clearances. It is more ductile, so they may be better for putting up with heavy loads or knock. The 4032 is a better choice on a street car that rarely sees abuse, and will result in a longer service life. Personally I would probably get my hands on some 2618 pistons if this is a project car that you tune for racing.
 
4032 is high silicon, 2618 is low silicon. The silicon content affects its thermal expansion rate, so 2618s need larger piston-to-cylinder clearances. It is more ductile, so they may be better for putting up with heavy loads or knock. The 4032 is a better choice on a street car that rarely sees abuse, and will result in a longer service life. Personally I would probably get my hands on some 2618 pistons if this is a project car that you tune for racing.

Gotcha
 
the different alloys will have different ys, uts, and ductility. That's what is important when you are trying to make 200+hp/hole. Other users and what the manufactures discontinue shouldn't even be a consideration.
 
Thanks, can anyone tell me if the 4032 are really that weak?
No, it's not "weak" at all.
First of all, nothing is bad with 4032. Just different character/spec from 2618. Since 4032 is harder, when you damage 4032 pistons, the damages may go a little bit worse than 2618 but in case if you have a situation to damage 4032 pistons, you would probably damage even pistons are 2618, anyways you would need to rebuild your engine in that case. Before 4032 pistons were preferred by many N/A road racing/circuit people and also in street cars since you could go with less PTW clearance and lighter weight. This is one of reasons why people in the internet misunderstand that 4032 is "weaker" than 2618, or 4032 is only for street or something like that. It is not stronger or weaker, it is just their character is different. But according to the differences of both material that are mentioned above, most of case who build high horsepower engine prefer to use 2618 pistons.

This is my personal experience and opinion.
I would go with 2618 if I build a 700-800+hp engine. in general, 800+ hp engine is not considered much as "street" and nowadays technologies and piston's design have improved a lot, 2618 pistons got more popular and require less PTW clearance than before, also you can easily customize to make it lighter.
But this doesn't mean 4032 pistons don't work. I never had any issues when I was using 4032 pistons. was running with 25-30ish psi plus 175-200 shot of nitrous on it. Assuming your engine is built and is tuned properly, maybe your H-beam rods or rod bolts/caps would end before something happens to 4032 pistons.
 
No, it's not "weak" at all.
First of all, nothing is bad with 4032. Just different character/spec from 2618. Since 4032 is harder, when you damage 4032 pistons, the damages may go a little bit worse than 2618 but in case if you have a situation to damage 4032 pistons, you would probably damage even pistons are 2618, anyways you would need to rebuild your engine in that case. Before 4032 pistons were preferred by many N/A road racing/circuit people and also in street cars since you could go with less PTW clearance and lighter weight. This is one of reasons why people in the internet misunderstand that 4032 is "weaker" than 2618, or 4032 is only for street or something like that. It is not stronger or weaker, it is just their character is different. But according to the differences of both material that are mentioned above, most of case who build high horsepower engine prefer to use 2618 pistons.

This is my personal experience and opinion.
I would go with 2618 if I build a 700-800+hp engine. in general, 800+ hp engine is not considered much as "street" and nowadays technologies and piston's design have improved a lot, 2618 pistons got more popular and require less PTW clearance than before, also you can easily customize to make it lighter.
But this doesn't mean 4032 pistons don't work. I never had any issues when I was using 4032 pistons. was running with 25-30ish psi plus 175-200 shot of nitrous on it. Assuming your engine is built and is tuned properly, maybe your H-beam rods or rod bolts/caps would end before something happens to 4032 pistons.

Hmm is what I was looking for, when I looked at the charts on the materials strength, they were very different from one another.

Running 25 to 30psi is good to know as well, did you run SRP Pros?
 
Hmm is what I was looking for, when I looked at the charts on the materials strength, they were very different from one another.

Running 25 to 30psi is good to know as well, did you run SRP Pros?

Be careful with pistons like that and I don't mean the material.
I purchased some (I do not remember the brand of the piston) from ebay once as they were forged and seemed incredible but were less money than the typical JE pistons.
A few months later the engine broke (Eagle rods were used) and the reason was the thickness of the wrist pin, next to the JE (which I then purchased for the new rebuild) the wrist pins were half as thick as the JE. Had the wrist pin not broke I would still be running those pistons.
From my point of view be careful when selecting other than the tried and true products most DSM shops use because they could be junk. This was 8 years ago. I was only making 376hp to the wheels on the Road Race dyno when tuned.
 
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