[elcaminodragster]

ok so they tested 2 1/4 inch louvered glass packs. how long where they???

also on that web page the test results for straight pipes...

2 1/2 inches 521 cfm
2 1/4 inches 365 cfm
2 inches 283 cfm

so from 2 inches to 2 1/2 inches it nearly doubled with just a 1/2 inch. so what might the flow be for 3 inch louvered glass packs??? it must be far better then the 2 1/4 inch ones.

[454C10]

Yes the 3 inch will flow better but the extra length (32 inch versus 18 inch) will cancel out a lot of the flow improvement gained from the extra diameter.

3" pipe has 180% more cross section than a 2-1/4 pipe but 32 inches just happens to be 180% longer than 18 inches. So there should be no flow difference between a 32 inch long, 3 inch diameter hornie and a 18 inch long, 2-1/4 diameter hornie.

[jimfulco]

15" of water refers to how they measure the vacuum. It's a vacuum that's strong enough to lift water 15" up a tube. Imagine putting a 6-foot clear rigid plastic tube on a vacuum cleaner and sticking the tube straight down into a bucket of water while the thing's running. If it sucks the water up 15" higher than the level of water in the bucket, that's the strength of vacuum they used. The "Hg refers to how far it'll suck mercury up a tube. The whole stinkin thing's kinda confusing, like measuring power in horsepower vs kilowatts.

Conversion: 1.5"Hg = 20.4"H2O = 0.74psi

But just in case anybody's curious, glasspacks actually are quite a bit quieter under water, with sort of a burbling sound. Can't say how they performed though, what with the wet tires and the resistance caused by water up to the stinkin doors, but the sound was kinda cool.

[Chevrolet4x4s]

Originally Posted by 1970Chevy

Hey does anybody know what would happen if one were to only run resonators and no muffler. I know that on luxery cars there is a muffler Plus a resonator, thus a very muffled and quiet sound. I would think that the resonator doesnt do as much murdering of sound that a muffler does. I also take into consideration the tone of the sound produced, and Im assuming that depends on the volume of the resonator chamber.

slp has the loudmouth resanator exhaust system for camaros etc .....some resonators look like a perforated core glasspack(tips) but arent the resonators found in the exhaust system upstream of the exit just hollow like an expansion chamber ? ........I have an old set of "glasspacks" that appear to have 2 tubes in them ........that I'm going to cutapart and make resonators out of
Shane

[454C10]

I have used dynomax bullets as a resonators with great results. They also have perforated tube design and they don't cost much. They flow also like a straight pipe.

Recently I install dual 12" dynomax mufflers in a very ugly sounding exhaust that would resonate so badly you would think the exhaust was dumping in the cab. After the two little dynomax's, it sounded almost like stock exhaust with no flow penalty.

[454C10]

check this out

http://www.boyleworks.com/ta400/psp/exhaust.html