Rod Bolt Stretch Gauge
Rod Bolt Stretch Gauge - News
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ARP Rod Bolt Stretch Gauge - Engine Assembly Tools - Tool of the ...
Information is a wonderful thing because it enables us to find better ways of doing things. When building an engine, the traditional method of ensuring that fasteners are doing their job is to tighten them down using a torque wrench. This method works in most cases, but it's not the most accurate method for ensuring that the bolts in critical applications have enough preload and clamping force to overcome the dynamic load of the parts they are attempting to hold together. The best example of this situation is the connecting rod bolts inside of an internal combustion engine. The fasteners holding the big end of the rods together are the highest loaded bolts in the entire engine.
The job of the rod bolt is to keep the two parts of the connecting rod together, while the oscillating motion of the piston and crankshaft tries to rip the assembly apart. The force exerted on the rod bolts is at its greatest when the piston reaches top and bottom dead center of the stroke and has to instantly change direction. In short, it's a lot to ask of a bolt to keep the parts together at high rpm and rod bolt failures are pretty common when they aren't installed correctly.
The best way to ensure the right amount of preload is present in these bolts is to measure the length of the bolts before they are installed and then measure the amount the bolts stretch as they are torqued. ARP's rod bolt stretch gauge makes doing this job pretty easy. The company also offers a bitchin ring compressor that makes installing the piston and ring assemblies into your engine super easy as well. Check it out.
2.With the rod bolts lubricated with the right lube (in this case we used ARP moly lube) and installed into the rod hand-tight, the stretch gauge is adjusted so that there is about .400 inch travel in the gauge once it's positioned into the head of the bolt. It's important to center the points of the gauge into the dimpled portions of the end of the bolts and then zero the gauge. This requires a bit of feel to get the gauge reading accurately because there's enough slop in the dimples for the gauge to move around a bit. 3.Next, the rod bolts are torqued just shy of the recommended torque spec. In our case, ARP recommended the bolts be torqued to 70-75 lb-ft or stretched to .0050-.0055 inch. Most of the bolts did stretch to .Rod Bolt Stretch Gauge - Bookshelf
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Two excellent examples of this gauge include units from BHJ and Goodson. BHJ's RBG-1 rod bolt stretch gauge features a heat-treated aluminum frame with a ...High Performance Fasteners & Plumbing
The smoothly-chamfered surface allows precision fit of a stretch gauge. Note how the stretch gauge dial indicator plunger nestles into the rod bolt head ...Rebuilding Gen V/Gen VI big-block Chevy engines, how to rebuild Generation V (1991-1995) and Generation VI (1996-present) engines to stock specifications
Here's a rod bolt stretch gauge. If you really want to get picky, in order to accurately tighten connecting rod bolts, you need to measure bolt stretch, ...BUILDING THE CHEVY LS ENGINE
These dimples allow the use of a stretch gauge, if the builder prefers to tighten rod bolts by monitoring bolt stretch instead of tightening by torque value ...John Lingenfelter on modifying small-block Chevy engines, high performance engine building and tuning for street and racing
Torquing stretches any bolt to establish a clamping load. The best way to ensure proper bolt stretch is to use a rod bolt stretch gauge such as this Childs ...Casual Posts Directory
Search Results for rod bolt stretch - SummitRacing.com
Our Summit® rod bolt stretch gauges have spherical points for repeatable readings. They are adjustable for length and right/left side configurations.
Rod Bolt Stretch Gauge: BHJ Products, +1 (510)797-6780
Any rod bolt manufacturer will admit that this ideal torque value may vary 10 ft./ lbs. ... The RBG-1 Rod Bolt Stretch Gauge has been designed to bring the bolts ...
JEGS Performance Products 80591 JEGS Billet Rod Bolt Stretch ...
Billet Aluminum Rod Bolt Stretch Gauge ... pre-load, or torque, on a connecting rod bolt. JEGS Billet Rod Bolt Stretch Gauge allows you to accurately measure bolt stretch. ...
ARP Rod Bolt Stretch Gauge - Engine Assembly Tools - Tool of ...
Automotive Racing Products' rod bolt stretch gauge makes measuring the lengths of bolts ... 1.A set of calipers is used to accurately record the rod bolt lengths. ...
Proform 66788 Rod Bolt Stretch Gauge
This is a brand new in the box Proform Rod Bolt Stretch Gauge. ... Using the stretch factors supplied by rod bolt manufacturers, this stretch gauge offers a highly accurate way ...