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Registered
Join Date: Jun 2009
Posts: 1,237
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what rod is this
Found this rod in my collection. 22mm bushing and a 53mm big end bore but wide at the big end, 23.75mm. Has rounded corners at the parting seams and the ribs on the beam have a polished finish. Thinking 3.0 RSR, but really don;t know. 911103105 OR on one side of the beam and 62/44 on the other side. Any one identify it. Thanks, Bob
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08-31-2020, 03:11 PM
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Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
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rod I.D.
That is a rod for 70.4 stroke with 6 bolt crank.People would round the corners off in the scheme of balancing end to end.Actually not a good idea as it weakens the strength at the parting line.RSR rod was the same with the exception of an additional bearing tang.There were 2 tangs per bearing half.The part number ended in 148-01.The side edges were beveled to shed oil because the RSR journal was a little different on the outer edges.They also were .001 larger.Just a little looser for the constant high RPM.Ciao Fred
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09-01-2020, 05:10 AM
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Registered
Join Date: Jun 2009
Posts: 1,237
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Fred, thanks for responding. This rod has 4 bearing cleats as apposed to the normal 2. The rounded corners appear to be factory, not done by some well meaning engine builder. Bob
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09-01-2020, 11:10 AM
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Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
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rod I.D.
With the polished beam and 4 tangs could be RSR.I converted a lot of rods to 4 tang in the 70,s for 2.5 SCCA engines and polished the beams and reduced the diameter on the small end.Fred
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09-02-2020, 02:38 AM
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