G-Man said it all. I tried different oils and found Castrol Syntec did get rid of most of my knock on my 3.4 engine in my wife's Aztec. Have not tried Start up or Blend.
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I am now a member of the never again club.
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"Around 1998, GM switched from a "Select Build" method of manufacturing and/or assembling engines to a "Net Build" method, in order to save money on manufacturing and/or assembly. In the Select Build process, pistons and cylinders are matched for size and fit. GM's new "Net Build" method of manufacturing and/or assembly, in contrast, assumes all pistons will fit equally well in all cylinders and does not allow for variations in the size of engine cylinders or pistons. The pistons of slightly varying size (all within spec) are not individually matched with the cylinders of slightly varying size (all within spec)."
Wow, talk about a big jump backwards. The service manual for my 1965 Cadillac lists about 10 slight variations in piston size which were measured and marked at the factory. Engine assemblers measured each bore and also made a letter mark. "A" pistons were put into "A" bores, "B" into "B" and so on. Good engine rebuilders achieve the same thing by custom honing each bore to give the correct clearance with the actual piston which is inserted into it.
These are things to think about when you see GM proudly telling the financial press how much money they have "saved" through "productivity" enhancements. An engine with enough clearance to create audible piston slap is clearly wearing it's bores and pistons more rapidly than one where the clearances are correct. Having purchased three new GM products during the past 15 years (none of which we still have) I am now a member of the never again club.
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Knock knock...who's there?
Grrrrrrrrrrrrrrrrrrr
Do a "Google." Piston slap HAS to be pervasive for so many sites to mention the problem.
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wgtoys,
I just want to say thanks man.
You're putting out some high quality posts that I find intriguing and educational.
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I have a 2004 chevy 1500 5.3L. No piston slap at all, ever. 43000 miles now. It is not as common as this forum leads people to believe. In fact, I have heard a lot of chevy's and know people who own them and not once have I ever heard it.
Exactly - that is what I'm reading from every source that isn't connected to that "piston slap" website.Quote:
It doesn't seem to be an issue in how long the engine lasts. Just annoying.
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. . . It's not just a GM issue, but seems to be more common in certain GM engines. It doesn't seem to be an issue in how long the engine lasts. Just annoying.