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2-cycle ring installation
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2-cycle ring installation
wrote in message ... On Wed, 10 Sep 2008 20:32:22 GMT, (Richard Casady) wrote: On Tue, 9 Sep 2008 17:33:28 -0400, "Lost In Space/Woodchuck" wrote: All depends if it's a steel, chrome, nicksil, or nicom cylinder bore. "TJ" wrote in message .. . I know that when new rings are installed in 4-cycle engines that it is generally recommended that the cylinder walls be honed to remove the glaze, so the the new rings will seat properly. Is the same true of 2-cycle engines? I expect it is, but I just thought I'd check. Most cars are plain cast iron: most outboards are plain aluminum. Casady Most aluminum cylinders have a sleeve of another, harder material. A "plain aluminum" cylinder wouldn't live very long. I think the only "aluminum" cylinder was the Chevy Vega. |
2-cycle ring installation
"Calif Bill" wrote in message m... I think the only "aluminum" cylinder was the Chevy Vega. I think you are correct. Aluminum can be hard anodized however, resulting in a surface hardness on the Rockwell scale very close to steel. Eisboch |
2-cycle ring installation
wrote in message ... On Wed, 10 Sep 2008 18:14:46 -0700, "Calif Bill" wrote: wrote in message . .. On Wed, 10 Sep 2008 20:32:22 GMT, (Richard Casady) wrote: On Tue, 9 Sep 2008 17:33:28 -0400, "Lost In Space/Woodchuck" wrote: All depends if it's a steel, chrome, nicksil, or nicom cylinder bore. "TJ" wrote in message .. . I know that when new rings are installed in 4-cycle engines that it is generally recommended that the cylinder walls be honed to remove the glaze, so the the new rings will seat properly. Is the same true of 2-cycle engines? I expect it is, but I just thought I'd check. Most cars are plain cast iron: most outboards are plain aluminum. Casady Most aluminum cylinders have a sleeve of another, harder material. A "plain aluminum" cylinder wouldn't live very long. I think the only "aluminum" cylinder was the Chevy Vega. I think you are wrong about that, as well. The cylinder bore was silicon in early models and they later switched to iron sleeves. They had additional woes due to the iron head mated to the aluminum block. Was a high silicon content aluminum. Had to be injection molded and cooled quickly or the silicon would precipitate out of the aluminum and leave a soft aluminum surface. The problem was defective head gaskets. They were porous. |
2-cycle ring installation
"Eisboch" wrote in message ... "Calif Bill" wrote in message m... I think the only "aluminum" cylinder was the Chevy Vega. I think you are correct. Aluminum can be hard anodized however, resulting in a surface hardness on the Rockwell scale very close to steel. Eisboch See my other reply regards the silicon content. |
2-cycle ring installation
"Eisboch" wrote in message ... "Calif Bill" wrote in message m... I think the only "aluminum" cylinder was the Chevy Vega. I think you are correct. Aluminum can be hard anodized however, resulting in a surface hardness on the Rockwell scale very close to steel. Eisboch Further on this: (I looked it up because I was curious) ..... The original Vega block was a cast aluminum alloy, called 390, that was 16-18% Silicon, 4-4.5% Copper and the rest, pure aluminum. It had no cast iron cylinder liners. The Si content increased wear resistance by allowing primary crystals of Si to precipitate out of the aluminum. This was all part of a general industry driven evolution of the use of aluminum as new alloys were developed and applications were being tried. It's also one of the reasons I've never been a big GM fan. It seems like they, more so than the other manufacturers, have a history of experimenting with things, like metallurgy in this case, using their customer's cars as the guinea pig test beds. In the case of the Vega, it certainly was a flop. Eisboch |
2-cycle ring installation
On Sep 11, 12:50*am, "Eisboch" wrote:
"Eisboch" wrote in message ... "Calif Bill" wrote in message om... I think the only "aluminum" cylinder was the Chevy Vega. I think you are correct. Aluminum can be hard anodized however, resulting in a surface hardness on the Rockwell scale very close to steel. Eisboch Further on this: *(I looked it up because I was curious) ..... The original Vega block was a cast aluminum alloy, called 390, that was 16-18% Silicon, 4-4.5% Copper and the rest, pure aluminum. It had no cast iron cylinder liners. *The Si content increased wear resistance by allowing primary crystals of Si to precipitate out of the aluminum. This was all part of a general industry driven evolution of the use of aluminum as new alloys were developed and applications were being tried. It's also one of the reasons I've never been a big GM fan. * It seems like they, more so than the other manufacturers, have a history of experimenting with things, like metallurgy in this case, using their customer's cars as the guinea pig test beds. In the case of the Vega, it certainly was a flop. Eisboch- Hide quoted text - - Show quoted text - Yeah, they public becomes the lab rat, and yes, gm was/is guilty. when they put the steel liners in that vega engine, they made a good engine... finally. But it lasted about a year or so and got ditched because the pubic was sick of their crap. |
2-cycle ring installation
On Wed, 10 Sep 2008 22:40:50 -0700, "Calif Bill"
wrote: wrote in message .. . On Wed, 10 Sep 2008 18:14:46 -0700, "Calif Bill" wrote: wrote in message ... On Wed, 10 Sep 2008 20:32:22 GMT, (Richard Casady) wrote: On Tue, 9 Sep 2008 17:33:28 -0400, "Lost In Space/Woodchuck" wrote: All depends if it's a steel, chrome, nicksil, or nicom cylinder bore. "TJ" wrote in message . .. I know that when new rings are installed in 4-cycle engines that it is generally recommended that the cylinder walls be honed to remove the glaze, so the the new rings will seat properly. Is the same true of 2-cycle engines? I expect it is, but I just thought I'd check. Most cars are plain cast iron: most outboards are plain aluminum. Casady Most aluminum cylinders have a sleeve of another, harder material. A "plain aluminum" cylinder wouldn't live very long. I think the only "aluminum" cylinder was the Chevy Vega. I think you are wrong about that, as well. The cylinder bore was silicon in early models and they later switched to iron sleeves. They had additional woes due to the iron head mated to the aluminum block. Was a high silicon content aluminum. Had to be injection molded and cooled quickly or the silicon would precipitate out of the aluminum and leave a soft aluminum surface. The problem was defective head gaskets. They were porous. Nope. The cylinders got etched leaving a silicon bore. The problem with the head gaskets was the different expansion and contraction rates of the iron head on the alumninum block. No gasket in the world could make up for that, as they found out. |
2-cycle ring installation
On Sep 11, 1:50*am, "Eisboch" wrote:
"Eisboch" wrote in message ... "Calif Bill" wrote in message om... I think the only "aluminum" cylinder was the Chevy Vega. I think you are correct. Aluminum can be hard anodized however, resulting in a surface hardness on the Rockwell scale very close to steel. Eisboch Further on this: *(I looked it up because I was curious) ..... The original Vega block was a cast aluminum alloy, called 390, that was 16-18% Silicon, 4-4.5% Copper and the rest, pure aluminum. It had no cast iron cylinder liners. *The Si content increased wear resistance by allowing primary crystals of Si to precipitate out of the aluminum. This was all part of a general industry driven evolution of the use of aluminum as new alloys were developed and applications were being tried. It's also one of the reasons I've never been a big GM fan. * It seems like they, more so than the other manufacturers, have a history of experimenting with things, like metallurgy in this case, using their customer's cars as the guinea pig test beds. In the case of the Vega, it certainly was a flop. Eisboch- Hide quoted text - - Show quoted text - I'll tell ya something about the Vega and Pinto. Although they were both pieces of crap, it was the start of new technology that produced smaller power plants that had decent weight to power ratios. A lot of the technology from those days drove what's in today's vehicles. |
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