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what is the value in using aluminum in a street application though? Just because it can be done, should it? I'm talking for the average 'car guy'...one of those things that are cool, but what is the true advantage to justify the cost difference; whereas that few hundred bucks (most people are on some budget) could be used somewhere else...
There are practical reasons for using Aluminum Rodsâ€â€the same reasons racers use them: less reciprocating and rotating mass due to their comparative lightness. That allows the engine to accelerate quicker and make more power as it does so. Lighter rods also improve throttle response and allow the engine to run reliably at a higher rpm than it could with steel rods. And a as stated before, a aluminum rod will transfer less shock load to the rod bearing than a steel rod. Less shock load on the rod bearing the longer it will live.
Also go look at the price of a good steel rod compared to a good aluminum rod.
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Now days its not uncommon to see a dsm that makes over 600awhp so eagles,scat and Manley "H" Beam rods are not going to cut it.
So now the price of a aluminum rod does not look so bad.
Big reason I went with a aluminum rod in my car was because I know I would be close to that 600awhp rating the cheaper rods have. I also new one day I will want more then 600awhp and really did not want to chance it with a rod that was only rated to 600awhp.
Hey if your only building a car that makes under 600awhp then stay with the cheaper rods. But if you are go with a aluminum rod. The price is around the same as a good steel rod if not cheaper and the benefits of running aluminum rods have been stated.