Con rod ?
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Con rod ?

  1. #1
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    Default Con rod ?

    If a H beam rod is generally stronger than a I beam rod, why are most of the aluminum and titanium rods (that I have seen) a I beam rod?

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    I beam rods

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    steelcomp was here
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    I would double check on the information that says H beams are stronger than I beams. I'm not sure that's correct.
    I'm not sure of anything, though...
    If God is your co-pilot, change seats!
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    Quote Originally Posted by steelcomp View Post
    I would double check on the information that says H beams are stronger than I beams. I'm not sure that's correct.
    I'm not sure of anything, though...
    Don't H beams create more windage ? or something like that. From the H-beam design I don't think an alumi H-beam would have much integrity would it ? Or it would be massive to have any strength.

    I think, I could be 180* out.

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    Quote Originally Posted by Sleeper CP View Post
    I think, I could be 180* out.

    Sleeper CP
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    each design has it's positives and negatives. Each design is stronger in one direction, not as strong in the other. When you consider that a rod's major load is in tension, probably comes down to beam mass more the shape. Last time I looked, the bad boys of alumn fueler rods did not have any beam "design". Just a straight, solid beam.



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    Why does it seem like big HP engines run aluminum rods but they're not common on street/strip cars or most boats?

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    Quote Originally Posted by hotrod56cars View Post
    Why does it seem like big HP engines run aluminum rods but they're not common on street/strip cars or most boats?
    I am guessing it has to do with the fatigue life of the metal. Since top fuel engines are torn down much more often then a typical street/strip car and the parts are replaced much more often it isnt an issue. In a street car I bet you would see a lot more failures from the same parts at half of the HP over the course of 100K with aluminum rods.

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    Quote Originally Posted by hotrod56cars View Post
    Why does it seem like big HP engines run aluminum rods but they're not common on street/strip cars or most boats?
    Blown Alki and Nitro engines use Alumi rods to absorb the shock to the crankshaft. A billet crank in a Nitro engine would snap about 10 feet off the line if it had steel or Ti rods.

    There was a thread two weeks ago about alumi rods in boats and cars. I'll see if I can find it. It has to do mostly with heat cycles and not knowing how stressed the alumi rods get, but heat really weakens them.

    Check out this thread:
    http://www.performanceboats.com//showthread.php?t=25812

    It started one direction and ended up going another, but good info in it.

    Sleeper CP
    Last edited by Sleeper CP; 01-06-2009 at 10:05 AM.

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