thanks
thanks for the thread, and nice pics. this one and lems crankshaft thread should be a sticky.
thanks for the thread, and nice pics. this one and lems crankshaft thread should be a sticky.
Stock rods vs. RPM 5140
2
There has been some talk lately about how stock rods compare to some of the 5140 rods on the market. I don't have any Eagle SIR rods on hand, but I do have some some RPM 5140 rods, so I took a few pictures to show the differences. The RPM rods in these pictures are 6.800 stroker versions with 2.2 journals, but the 6.605 versions are built very much the same.
Overall view of the two rods side by side. Notice the difference in the thickness of the material around the big end. Also notice that the RPM rods have 7/16" ARP bolts vs. the stocker's 3/8". While the RPM beam is narrower in width, it is about .060 thicker across the webbing.
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Close-up of the small end. Again notice the thickness of material around the pin as well as the width.
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Overall view of the two rods side by side. Notice the difference in the thickness of the material around the big end. Also notice that the RPM rods have 7/16" ARP bolts vs. the stocker's 3/8". While the RPM beam is narrower in width, it is about .060 thicker across the webbing.
Close-up of the small end. Again notice the thickness of material around the pin as well as the width.
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5
Here are a few pictures of the Eagle SIR rod that I had fail in a 460. I posted a description of this problem in a previous post but I didn't take any pictures. Here they are in all their gory detail:
Notice how the rod completely failed in the beam yet the big and small end were totally intact and undamaged. Bearings, rod journal, wrist pin etc all looked great. These rods were run in a 460 that was only ever turned a maximum of 6500rpm and when run in the application 6200rpm. Admittedly the KB 137 is not a light piston but the rpm level wasn't that high either. Engine horsepower was 585 and the engine ran a best et of 6.50 at 100 mph in the 1/8th mile in a 1962 Ford pickup. This was Wes Littrell's cousin Shannon's truck that was at the bash a few years ago.
These rods were used in the 460 I built for the Engine Masters' Challenge back in '03 so they probably had around 100 dyno pulls and probably 40-50 drag racing passes total.
While it's difficult to tell from the pictures it seems as though the RPM rod has possibly a bit more "beef" in the beam. This is the problem area on the SIR rods of the design that failed but I've also heard that Eagle has improved this design within the last couple of years, is this true?
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Notice how the rod completely failed in the beam yet the big and small end were totally intact and undamaged. Bearings, rod journal, wrist pin etc all looked great. These rods were run in a 460 that was only ever turned a maximum of 6500rpm and when run in the application 6200rpm. Admittedly the KB 137 is not a light piston but the rpm level wasn't that high either. Engine horsepower was 585 and the engine ran a best et of 6.50 at 100 mph in the 1/8th mile in a 1962 Ford pickup. This was Wes Littrell's cousin Shannon's truck that was at the bash a few years ago.
These rods were used in the 460 I built for the Engine Masters' Challenge back in '03 so they probably had around 100 dyno pulls and probably 40-50 drag racing passes total.
While it's difficult to tell from the pictures it seems as though the RPM rod has possibly a bit more "beef" in the beam. This is the problem area on the SIR rods of the design that failed but I've also heard that Eagle has improved this design within the last couple of years, is this true?
Found a picture of the 6.605 RPM rod:
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Fixed it for you.
Your a very funny guy.Fixed it for you.
Thats one of the problems with selling parts and giving advice on a form. Your compromised, Your always biased to what you want to sell and want people to believe it is so you can sell them.
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