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Latest post Wed, May 23 2018 9:22 AM by sfranta. 1 replies.
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  • Wed, May 23 2018 3:09 AM

    Sportster exhaust...


    I've just bought a Sportster 883, 1992 Evo chain-drive, CV carb and 5-speed in a moment of weakness.So, on first inspection it feels very nice. However it is appallingly loud and from long experience of British bikes and later, 500cc track racing engines making specific power outputs no Sportster will ever approach, I don't believe for a moment that this is necessary. Generally speaking, my gut feeling is that it would go best all round, on a free-flowing 2 into 1 system around 40" pipe length from the back cylinder. I don't like leg-burners, I did my time on those long ago, so I'm looking at the SuperTrapp stainless 2 into 1 - any thiughts or advice on this?

    Please help.

    I didn't find the right solution from the Internet.



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  • Wed, May 23 2018 9:22 AM In reply to

    Re: Sportster exhaust...

     that would be a good choice. 40 inches has generally been considered the ideal length for pipes on the long stroke harley motors for decades. remember, the harley is a long stroke motor compared to your racing engines. it is designed for torque, especially in the low and mid ranges. since it's max rpm is about 6000 on a stocke motor, it doesn't register large horsepower numbers, since foot pounds of torque times rpm divided by 5280 = horsepower. the racing motor gets it's big horsepower number from the high rpm, where the sportster horsepower numbers are more influenced by the torque number rather than the rpm number since it doesn't rev as high


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