View Poll Results: Pick one
Manley 2618 with 22 cc dish. 8.9:1 C/R
9
4.29%
New Mahle Boost pistons with 26cc dish. 8.7:1 C/R
44
20.95%
Wiesco Turbo pistons with 32cc dish. 8.4:1 C/R
59
28.10%
Dimond pistons wiith 20cc dish. 9.0:1 C/R
98
46.67%
Voters: 210. You may not vote on this poll
Which piston? Pick one
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
I would agree with Brian Nutter and Kurt from W2W on the 2618 and being about to take much more of a beating and yet keep on ticking. We have had so many people do crazy stuff with our engines it's insane and yet the 2618 Wisecos we've had were still there in the end. Maybe some were more "Salvador Dali" like after there run ins with some of the super tuners but they were still there. BTW my mustang has 150K on some Manley 2618 pistons and doesn't have any problems but it is a lame *** motor!
I have had the opposite experiences with some JE and SRP 4032 alloy power adder pistons that cracked and came apart on two different engines though. I've even had NA only engines with nice JE 4032 pistons crack at the ring lands near the reliefs from some pretty stout detonation and the same JE piston in 2618 was still there just had a little less leak down so you knew it was hurt when they were pounded but they wouldn't break like the 4032 pistons did. 2618 is certainly more durable under duress and it seems that the LS1s on this board are always getting beat on!
I have had the opposite experiences with some JE and SRP 4032 alloy power adder pistons that cracked and came apart on two different engines though. I've even had NA only engines with nice JE 4032 pistons crack at the ring lands near the reliefs from some pretty stout detonation and the same JE piston in 2618 was still there just had a little less leak down so you knew it was hurt when they were pounded but they wouldn't break like the 4032 pistons did. 2618 is certainly more durable under duress and it seems that the LS1s on this board are always getting beat on!
Originally Posted by TurboGoat
Where can I order these?
Wiesco Turbo pistons with 32cc dish. 8.4:1 C/R
Wiesco Turbo pistons with 32cc dish. 8.4:1 C/R
LME built mine with those pistons... Im sure they can order it for you.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Originally Posted by TurboGoat
whats the compression if I use the 25cc wiseco's and 72cc 317 heads? won't it be too low?
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On The Tree
Joined: Sep 2006
Posts: 141
Likes: 0
Originally Posted by racer7088
Your compression would be 7.7ish to one. Yeah with the 6.0 heads you could use the Diamond #11503 and be around 8.9 to 1.
Wiseco does not have a smaller size?
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Originally Posted by TurboGoat
So would it be more beneficial then to just use 241 or 243 heads or get the smaller dish pistons?
Wiseco does not have a smaller size?
Wiseco does not have a smaller size?
I have VERY similar goals and parts as you. D1SC mmaxing out, with a 50-100 shot on top of it. Iron 370 shortblock, stock crank, eagle rods with L19 bolts, and i went with the eagle pistons as per speed inc. They preffer that piston in their builds. I told em my goal was to run an AFR 225 with the 72cc chamber and wanted a 9.2-9.3 compression ratio. I got the -14.9cc piston which actually puts me at just under 9.0 as stated in the post above this. They wrote the wrong piston CC down on the sheet when i ordered so i assumed i was good to go on compression. When i found out the problem they explained its the right piston for my application. It was just on my invoice wrong. They then told me my comprsession would be 9.2 and linked me to a calculator to show me. But i did the math and it was not the same result. I PMed em to ask what an alternative head may be and that i still wanted to use their shortblock as i beleived its a strong motor, the only response i got was, you can return it for a refund 
So im actually kinda in the same boat as you. But im trying to decide on a head/chamber, whereas you can still pick a different piston still.
So im actually kinda in the same boat as you. But im trying to decide on a head/chamber, whereas you can still pick a different piston still. 
Dimaond pistons are very cheap and they quality is not nearly as good as some of the others you have listed Mahle, Weisco/JE,and CP, but you don't have them listed. Dimond pistons are fine if you want a cheap piston to hold up that they do. If you want a good race build then I would go with one of the others as they have better machining and while it may only be say one percent lower than say another it all adds up in the end IMO. Not saying there aren't a lot of people running them with great success, but you did ask for our opinions so I gave mine. I have used Weiso, JE,Mahle,Keith Black, Lunati and TRW pistons at some time in my life and while some of those CO use other people to make the pistons for them I have been happiest with my Wiesco's and Mahle's. Good luck you will be fine what ever you do.
Originally Posted by motorbuilt
What is your "basis" of diamonds being cheap? I think thats just a broad statement with no facts or info to back it up.
TECH Enthusiast
Joined: Dec 2001
Posts: 548
Likes: 0
From: Dublin, CA
I was very happy with my Diamond pistons as well. Beautiful, fully machined pistons, and they showed very little wear after 35,000 miles. I'm going with Wiseco next since they're the only 4.125" bore piston for a 3.622" stroke, and they'll work with my existing 6.125" rods.
As far as the poll goes, I think you should try to stay near 9:1CR because you'll feel sluggishness of lower CR around town (more rubberbandish feel).
Most forged piston manufacturers use 2618 alloy, which has low or no silicon content. OEM replacement pistons are a silicon/aluminum mix, which reduces expansion but also makes the piston more brittle, less mallable. Cracks in 4032 tend to propagate throughout the piston. With 2618 alloy you have a more durable, forgiving motor for those who like to tinker with their engines or who haven't finished upgrading boost, tune or fuel systems.
The Mahle dished pistons I had were also very thin around the valve reliefs. You couldn't pay me to use them again, or to use the vendor who recommended them to me for a high boost motor.
Take a look at how little material there is between the ring and valve relief. You can also see how porous the material looks in the crack surface.
As far as the poll goes, I think you should try to stay near 9:1CR because you'll feel sluggishness of lower CR around town (more rubberbandish feel).
Most forged piston manufacturers use 2618 alloy, which has low or no silicon content. OEM replacement pistons are a silicon/aluminum mix, which reduces expansion but also makes the piston more brittle, less mallable. Cracks in 4032 tend to propagate throughout the piston. With 2618 alloy you have a more durable, forgiving motor for those who like to tinker with their engines or who haven't finished upgrading boost, tune or fuel systems.
The Mahle dished pistons I had were also very thin around the valve reliefs. You couldn't pay me to use them again, or to use the vendor who recommended them to me for a high boost motor.
Take a look at how little material there is between the ring and valve relief. You can also see how porous the material looks in the crack surface.
Last edited by blu00rdstr; Jul 20, 2007 at 03:29 PM.
