ARC stock length billet rod with bearing inserts for the Harbor Freight Predator 212cc engine. Fits both the Hemi and non-Hemi versions. 3.308" center-to-center for a 1.188" rod journal and .709" wrist pin. Stock OEM length for use with the stock crankshaft and stock style (dished or flat top) piston in modified engines. Built from 7075-T651 aircraft grade aluminum. Uses ARC's custom manufactured bearing inserts and ARP rod bolts manufactured specifically for ARC. ARC has the only forced oiling scoop dipper rods available for these engines providing superior lubrication at the bearing journal.
Rod includes bolts & bearings.
Rod bolt torque: 170 in/lbs lubricated
To install your ARC rod you will need a 12 point 1/4" socket and a QUALITY inch pound torque wrench. You will need an outside micrometer, dial bore gauge or plasti gauge, and oil.
Measure the crank pin diameter with the outside mic, it should measure 1.188" +/-.0005". Measure in several spots to insure roundness. If out of round more than .0005" it probably should be replaced. The crank pin finish should be smooth to the touch.
When disassembling the rod notice on the side of the rod with the part number there are two dots next to the separation point of the beam and cap. These dots help to re-orientate the cap and beam when assembled. The side of the rod with the part number engraved will always face the side cover side.
Make sure the bearing and rod serrations are clean and install the bearings. Lubricate the rod bolt threads and hand tighten the bolts. Using the torque wrench tighten the bolts to 60" lbs. Alternate each side to increase the torque by 20" lbs at a time until you reach 150"lbs. Then loosen the bolts and repeat the torque process. this helps seat the rod bearing especially on a new rod. Measure the bore with your dial bore gauge opposite the parting lines. If using plasti gauge you will have to install the rod on the crank and use in accordance the plasti gauge instructions.
The rod bore should measure 1.191 +/.0005". With plasti gauge you are looking for about .003" clearance. From .0025-.0035" clearance is acceptable. Anything outside that dimension please call 800-521-3560 for recommendation.
Once clearance is set apply oil to rod, crank, and wrist pin and install this time torque to 170"lbs.
Improperly torquing rod bolts is one of the most common causes of rod failure.
Refer to instructions shipped with all rods and the video below for more detailed instructions.
12 Reviews Hide Reviews Show Reviews
Makes it so you can safely turn your engine high rpm
Excellent product. Very fast shipping. Wonderful Company.
The heart of our racing motors, we would not build any of our motors without using this rod!
Great product and fit!
Whoever decided that torx head bolts were a good idea is a fucking moron. So now I have to wait until I can get my tools from work to finish my 212 because ARC just couldn’t use a standard hex head bolt..
Some of the best machine work on a piece I have seen in 40 years of professional racing.
Used ARC billet flywheel and connecting rod for my Predator build for mini bike, 22 pound valve springs and ARC push rods, Mod 2 cam. All I can say rite now is that I'm very impressed with the power and performance of this small engine Thank you ARC Bruce
Great quality product. Love how they pay attention to detail.
The billet rod fir perfectly and oil clearances checked out exactly as they should. this provides confidence that the motor will stay together through abuse.