1972 truck exhaust up-grade

Discussion in 'Exhaust and Mufflers' started by Grumpy, Dec 11, 2017.

  1. Grumpy

    Grumpy The Grumpy Grease Monkey Staff Member




    a properly designed DUAL 2.5" exhaust (especially with a (X) pipe) should provide a noticeable improvement, as usual theres plenty of math to point you in the correct direction

    in the ideal exhaust system youll want to have less than .5
    (thats 1/2 a PSI of back pressure) at the engines peak rpm

    Id also point out that cam timing matched to the exhaust scavenging has a huge effect on potential intake flow rates
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    http://www.exhaustvideos.com/faq/how-to-calculate-muffler-size-pipe-diameter/

    http://www.mk5cortinaestate.co.uk/calculator5.php

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    3" o.d = 2.87" diam. inside--approximately 6.5 sq inches of area
    2.75 o.d = 2.62"diam. inside--approximately 5.4 sq inches of area
    2.5 o.d = 2.37" diam. inside--approximately 4.4 sq inches of area
    2.25 o.d = 2.12" diam. inside--approximately 3.5 sq inches of area

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    well worth reading

    http://www.popularhotrodding.com/engine ... ndex1.html


    http://garage.grumpysperformance.com/index.php?threads/exhaust-components.361/

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    http://garage.grumpysperformance.com/index.php?threads/calculating-required-exhaust-pipe-size.11552/

    http://garage.grumpysperformance.co...-exhaust-pipe-diam-for-your-application.1730/

    http://garage.grumpysperformance.com/index.php?threads/is-backpressure-hurting-your-combo.495/

    http://garage.grumpysperformance.com/index.php?threads/building-an-exhaust-system-for-your-car.1166/

    http://garage.grumpysperformance.co...-calculators-and-basic-math.10705/#post-72061

    http://www.wallaceracing.com/Calculators.htm
     
    Last edited: Dec 12, 2017

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