1 fast z Posted September 11, 2006 Share Posted September 11, 2006 Ok, I took some rods to my ex-jobs engineering department, and looked through a high powered microscope at NA and TURBO rods, NO difference. So I have prooved as far as I can, I would love to see evidence of this so called all turbo rods are shot peened. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted September 11, 2006 Share Posted September 11, 2006 How would you tell them apart visually, would there be marks left by the shot-peening process? Like little impact divots? I've never seen a shot peened rod, so I'm just curious. Quote Link to comment Share on other sites More sharing options...
johnc Posted September 11, 2006 Share Posted September 11, 2006 Shot peening is a surface treatment that compresses the surface of a part and cold works it to increase fatigue resistance, reduce stress risers, and increase durability. I personally haven't seen any surface finish differnces between rods from a turbo F54 block and rods from a NA N42 block but that doesn't mean much. Depending on the shot peening process, it might be difficult or impossible to tell the difference between a peened part and a part that had be abrasively clenaed or polished. Also, its very common to polish a part after its shot peened. Quote Link to comment Share on other sites More sharing options...
Twoeightnine Posted September 11, 2006 Share Posted September 11, 2006 Two cents. I have some experience with shot peening for what its worth. When I have had to have a fabricated part shot peened or a structural repair area shot peened, the process is fairly straight forward but very specific. In short the shot peen process useing flap strap or free ball is a carefully calculated process with respect to duration. And that duration is extensive. The part is whapped for so long that it is difficult to tell the difference. You dont see any "dents". Its very smooth. And yes polish is usually part of the process. Age the part and it is impossible to tell the difference. A surface hardness test will show the diff but, in the case of a rod, the hardness tester will defeat the benefits that shot peening provides...stress free surface....by creating a diviot in the part. Going to need more factory data on this one. It's gotta be there somewhere! Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted September 11, 2006 Share Posted September 11, 2006 http://carfiche.com/fiche009/s130/2/c08.gif Carfiche only appears to list one conrod for both L28E and L28ET. Dave Quote Link to comment Share on other sites More sharing options...
1 fast z Posted September 12, 2006 Share Posted September 12, 2006 http://carfiche.com/fiche009/s130/2/c08.gif Carfiche only appears to list one conrod for both L28E and L28ET. Dave Yep, sure enough. They wouldnt need to use a different rod for the low boost turbo cars, when 600 HP is done on stock rods, and they knew about that one before 1981. Same rods on ALL L28's Quote Link to comment Share on other sites More sharing options...
Twoeightnine Posted September 12, 2006 Share Posted September 12, 2006 After market, and OEM. 2753 2.8 6 81-83 PF .8260 5.139 Engine model L28E, L28ET 280ZX, 280ZX turbo A87 R83170 R83170 Quote Link to comment Share on other sites More sharing options...
Guest Andrew240 Posted September 13, 2006 Share Posted September 13, 2006 I have rods from both. I also have a Rockwell tester at work I can use. I'll be pulling the rods out of my turbo block sometime this week. I'll test a non-turbo L28 rod, and a turbo L28 rod, and report the hardness of each. Will that help? Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted September 13, 2006 Share Posted September 13, 2006 Just a tad. Dave Quote Link to comment Share on other sites More sharing options...
Guest Cronic Posted September 13, 2006 Share Posted September 13, 2006 Just a kind of FYI - it might be a good idea to stay away from a headgasket (other then stock) until you have a forged bottom end. Sure having a nice HG on there is great, and prevents from blowing a stock one... But in the case of detonation, where do you want that force from predetonation going... through the HG? Or through the pistons, rings, and rods? Quote Link to comment Share on other sites More sharing options...
Twoeightnine Posted September 13, 2006 Share Posted September 13, 2006 I have rods from both. I also have a Rockwell tester at work I can use. I'll be pulling the rods out of my turbo block sometime this week. I'll test a non-turbo L28 rod' date=' and a turbo L28 rod, and report the hardness of each. Will that help?[/quote'] Now your talking! Quote Link to comment Share on other sites More sharing options...
1 fast z Posted September 13, 2006 Share Posted September 13, 2006 Eh, I own a C scale rockwell tester also, I could verify results if need be. Quote Link to comment Share on other sites More sharing options...
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