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Jay’s Tech Tips #7: Rod Bolt Torque and Stretch

September 5, 2019


Hi, I’m Jay from Real Street Performance. Today we’re gonna talk about rod bolt torque and stretch. This is an ARP bolt stretch gauge. We sell here at Real Street. So you can call one of your sales guys and put an oder in if you want to add this to your arsenal of tools. And it helps remove any inaccuracy that your torque wrench may have. because you’re giving yourself a way to double check your math. You’re gonna want to check the bolt length at a relaxed state. So the bolt has a little divot in the end. And also a radiused. recessed area in the head. That when you put these 2 together it kinda snaps into place. And it will kinda hang out there. And you can then zero out the gauge. Once you got the gauge zeroed out, and the bolt is not torqued. You can kinda run it up and check stretch. While you’re torquing the bolt, it’s important that you have a known, good torque wrench. And that you’re strong enough to torque the fastener up in an even pull. You do not want to be bouncing on this wrench to tighten it up. So I’ll just nose it up to get the bolt tight in the rod, and then just run it to it’s stretch. And then… obviously in the engine it’s a little different dynamic, but we’re just doing this on the bench. The you can pop the torque stretch gauge back on. And check and see where you are at for stretch. This is 6-3, 6-7. We’re like 6-2 there. So we’re gonna call this particular bolt and this particular bolt reading pretty accurate. Also when you’re identifying your fasteners, look at the end of your fastener. Typically they are labeled in the length and material. This is an ARP 2000. You may buy some 625+s or you may get a base which won’t have this marking on it. All fasteners will carry their own specified torque and stretch. Hope you enjoy these little bits of informations. If you’d like to subscribe you can click the link below. We will be doing more of these moving forward and some other stuff here at Real Street.

5 Comments

  • Reply Chris Baines November 29, 2014 at 2:38 am

    Great tech tips from one of the best tech's and performance shops in Central Florida and in the game. If I may ask can you give an overview of boost controllers and wide band units.
    I currently have all AEM electronics being Tru-boost and AEM wideband plus AEM  320lph fuel pump. My question is are Innovative and Turbosmart that much better than AEM in terms of controlling boost and monitoring AFR's? Thank you and keep posting these awesome tech tips.

  • Reply h8ryj May 20, 2015 at 11:24 pm

    One of the most informative engine building guides i've ever come across! You got a huge fan from London, UK 🙂

  • Reply Conner Wheatley January 23, 2017 at 6:41 pm

    What brand torque wrench do you use? I am trying to decide on a good torque wrench but i want something that is good quality and accurate.

  • Reply Abba Elohi January 29, 2017 at 7:27 pm

    please change all that cheesy music i cant stand it lol. good stuff though. change music

  • Reply Erik Arevalo July 22, 2019 at 12:06 am

    💯

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