Quote:
Originally Posted by 95LT1Z
wow thanks for all the info man! i've been waiting to get a straight answer on this and can't seem to find one til now. one more question... on spintechs website for the crossflow type muffler such as the one i have on my car. they advertise that it flows 175cfm @5" H2O. why do they use such a low pressure drop. and is it true? the muffler in/out specs are 3" in/ dual 2.5" outlets.
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You want me to do even more calculations for you when I've been kind enough to give you the equations to use? Ho hum, ok one more.
Flow at 25" would be sq rt (25 / 5) = 2.23 times as much as at 5" so 175 CFM at 5" would be 391 CFM at 25".
Clearly that's abundantly possible from a 3" pipe and also drastically restrictive for your engine. Barely good enough for 175 bhp.
Why are they testing at 5"? I haven't the faintest idea. Are their figures even correct? Same answer.
Dave
Edit: They're probably testing at 5" because they don't have a big enough flow bench to pull a higher pressure drop across things as big as mufflers.