question 2.7 Sleeved block
04-20-2011, 09:32 PM
#31
The one thing I've heard about JE pistons are they are based on a piston design made by JE for domestic engines. Don't know if that's a HUGE deal or anything to anyone. There is extra material on the underside of the piston for valve reliefs that they usually don't machine out for other applications. Also something about the size of the grooves for the rings. Not too familiar with them, and did not use them in my application.
04-20-2011, 09:52 PM
#32
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The original guy putting this car together was Sean Hall I am not sure if it was a lister, car was sold to Mr Wolf, I have all the receipts and maintenance for the car, after the sleeved work was done and a mls gasket installed the car leaked, Eric replaced the gasket with a standard 2.7L, I found the problem, the standard 2.7L head gasket is for the 3.L block which has the water jacket by the front, so some genius along the way cut the water jacket part of the 2.7L head gasket aligned with the 2.5L water jacket, what they needed to do was to order a custom head gasket and they would have solved the problems
04-20-2011, 10:01 PM
#33
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^^^^ back when there were no MLS gaskets for big bore motors the gaskets were pieced together, I still have the 2 piece head gasket I removed from my car
04-20-2011, 10:11 PM
#34
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04-20-2011, 10:21 PM
#36
Three Wheelin'
Custom built 2618 forged pistons. JE, www.uschrome.com, and my engine builder, Garrity Repta, worked together to make sure the piston sizing to bore size were exact.
Garrity used to teach the PCA engine building classes for PCA. Some of the listers that have done their own 3.0 builds went to his classes.
Garrity used to teach the PCA engine building classes for PCA. Some of the listers that have done their own 3.0 builds went to his classes.
Then you can use the stock or stock compatible pistons?
04-20-2011, 10:58 PM
#38
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I thought the 2.7 crank was the same as the 2.5 L. crank. The 3.0 stroked the 2.7 105mm bore to get to the 3.0 l displacement. I am running a 2.5 L 100mm bore with a 3.0 L crank that results in a little less than a 2.8 L engine. Please let me know where I am wrong in this.
04-20-2011, 11:00 PM
#40
Drifting
Yes they can, and offer a one year warranty. I'd still just pick up a piece of **** block and send it to US Chrome or get a quote for repair. They can also make your 2.5 into a 2.7 or 2.8 without using a 3.0 crank.
This from their site. "Worn out and even heavily damaged, cracked, or gouged cylinders can be completely reconditioned to factory specification, exchanged, or upgraded to big-bore displacement, at a fraction of the cost of a new cylinder and a one year warranty.
The process includes stripping away the old coating, welding and boring(if required), plating with NiCOM, and diamond honing to finish dimension. NiCOM is an electroplated nickel matrix with silicon carbide particles uniformly dispersed throughout. The inclusion of these dense ceramic particles raises the hardness of the coating and produces unique properties."
Most of the 928 big block boosted guys use this process. The racing applications out there using this process is in the 100's of thousands. Many OE racing applications use this process. They have been doing this since 1946 and it's all they do.
This from their site. "Worn out and even heavily damaged, cracked, or gouged cylinders can be completely reconditioned to factory specification, exchanged, or upgraded to big-bore displacement, at a fraction of the cost of a new cylinder and a one year warranty.
The process includes stripping away the old coating, welding and boring(if required), plating with NiCOM, and diamond honing to finish dimension. NiCOM is an electroplated nickel matrix with silicon carbide particles uniformly dispersed throughout. The inclusion of these dense ceramic particles raises the hardness of the coating and produces unique properties."
Most of the 928 big block boosted guys use this process. The racing applications out there using this process is in the 100's of thousands. Many OE racing applications use this process. They have been doing this since 1946 and it's all they do.
04-20-2011, 11:05 PM
#42
Drifting
The one thing I've heard about JE pistons are they are based on a piston design made by JE for domestic engines. Don't know if that's a HUGE deal or anything to anyone. There is extra material on the underside of the piston for valve reliefs that they usually don't machine out for other applications. Also something about the size of the grooves for the rings. Not too familiar with them, and did not use them in my application.
04-20-2011, 11:11 PM
#43
Drifting
It's fine. I just want to help. I've been modding these cars for over 20 years. I've modded EVO's, Saab's, M3's, Nissan Z's, and a host of other neat cars and offroad vehicles. This is my THIRD modded 951. I've been through the ringer with the 951, and simply want to share what worked and what didn't. I've been on both sides of this table. I've seen ****ty work and I've seen works of art.
These cars are fun as hell if you have the budget to keep them going. Once modded, things get as expensive as any other high end modded car. It's expensive as hell, and If my input saves someone thousands of dollars, I'm present.
George
These cars are fun as hell if you have the budget to keep them going. Once modded, things get as expensive as any other high end modded car. It's expensive as hell, and If my input saves someone thousands of dollars, I'm present.
George
04-20-2011, 11:35 PM
#44
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George
I think in essence you're right. My suggestion is based on 2 of us that had multiple failures using MIDs and JE pistons. After my 3rd failure I raised the white flag. We came to the conclusion that the JE's expanded at a different rate than the Iron sleeves. This was corroborated by other parties who had similar issues. Subsequently I feel that there could well have been an issue with the machinist who installed the sleeves but this can't be proved beyond doubt. So when I suggest using a different piston it is only based on someone having the choice to do so and having something made for their exact motor.
However, this is not an attempt to tar all JE's with the same brush. Sounds like the ones you've got have been designed expressly for your purpose and should provide you with many thousands of miles of happy boosting!
I think in essence you're right. My suggestion is based on 2 of us that had multiple failures using MIDs and JE pistons. After my 3rd failure I raised the white flag. We came to the conclusion that the JE's expanded at a different rate than the Iron sleeves. This was corroborated by other parties who had similar issues. Subsequently I feel that there could well have been an issue with the machinist who installed the sleeves but this can't be proved beyond doubt. So when I suggest using a different piston it is only based on someone having the choice to do so and having something made for their exact motor.
However, this is not an attempt to tar all JE's with the same brush. Sounds like the ones you've got have been designed expressly for your purpose and should provide you with many thousands of miles of happy boosting!
04-20-2011, 11:37 PM
#45
Three Wheelin'
Yes they can, and offer a one year warranty. I'd still just pick up a piece of **** block and send it to US Chrome or get a quote for repair. They can also make your 2.5 into a 2.7 or 2.8 without using a 3.0 crank.
This from their site. "Worn out and even heavily damaged, cracked, or gouged cylinders can be completely reconditioned to factory specification, exchanged, or upgraded to big-bore displacement, at a fraction of the cost of a new cylinder and a one year warranty.
The process includes stripping away the old coating, welding and boring(if required), plating with NiCOM, and diamond honing to finish dimension. NiCOM is an electroplated nickel matrix with silicon carbide particles uniformly dispersed throughout. The inclusion of these dense ceramic particles raises the hardness of the coating and produces unique properties."
Most of the 928 big block boosted guys use this process. The racing applications out there using this process is in the 100's of thousands. Many OE racing applications use this process. They have been doing this since 1946 and it's all they do.
This from their site. "Worn out and even heavily damaged, cracked, or gouged cylinders can be completely reconditioned to factory specification, exchanged, or upgraded to big-bore displacement, at a fraction of the cost of a new cylinder and a one year warranty.
The process includes stripping away the old coating, welding and boring(if required), plating with NiCOM, and diamond honing to finish dimension. NiCOM is an electroplated nickel matrix with silicon carbide particles uniformly dispersed throughout. The inclusion of these dense ceramic particles raises the hardness of the coating and produces unique properties."
Most of the 928 big block boosted guys use this process. The racing applications out there using this process is in the 100's of thousands. Many OE racing applications use this process. They have been doing this since 1946 and it's all they do.
Thanks for the clarification! Reading between the lines that is what I was getting, they could repair and or enlarge blocks but then they keep switching back to send your cylinder in! Ok so throwing out the stroker motor, well the 3Lcrank anyway, it comes down to this or the MID for a 2.7/2.8 motor. Wait isn't the 2.7 a bigger bore and the 2.5 crank?