Louie L. said:
Remember those Dps are huge when they are only flowing 140.5 ci.
By that measure, we can assume the same with our little 231 ci motors. That DP isnt flowing "only" 140.5 cubes. Its flowing 30-40psi through a motor where the heads flow 340cfm at 28" of vacuum. I have a set of these heads (I used to have a 99 cobra) that I ported for street use that flow 300cfm@ 28", and flow 283cfm at only .400 lift, and 242@.300 lift. These modular ford heads have extremely high low lift and "average" flow numbers. Plus its using pretty efficient turbos that are flowing ALOT of air at those boost levels. Imagine what those heads are flowing at say, 35psi through race heads at 10,000 rpm. Boost is just a measure of resistance. It doesnt really mean much. Flow is what matters. Each one of those small DP's are probably flowing as much air as an 8 or 9 second turbo regal does through 1 downpipe. We are talking close to 2000 hp here.
As far as the flowmaster muffler thing, thats really not much of an issue. Flowmasters suck on all cars. They dont flow for ****. Ironic name for a muffler that doesnt flow worth a damn. :biggrin: If anything, the distance from the compressor to the expansion area (muffler) may make a difference, but probably not much. Anytime a pulse hits an area of greater
or less volume, a reversion wave bounces back to the origin. Same goes for intake manifolds, headers or anything that flows a fluid or gas. If the length of the port resonates at a given rpm, and you have a pinch point or an expansion area that pings a reversion wave back at a different rpm, things will be all screwed up. The cross sectional area should be a size that causes the charge to reach supersonic speed at the same rpm the tuned runner is designed to resonate at. If its way mismatched, you'll have a runner, or a tube that inherently resonates at a given rpm, but because of the diameter and resulting low pressure, it cant. Its traveling too slow to resonate at any rpm below 10 million gajillion rpm. By the time you reach 10 million gajillion rpm and the flow has reached supersonic speed, the runner is way too long to resonate at that rpm.
Im getting off track here. The pulses are dampened quite a bit by that compressor wheel, but still there. Its more of an issue of the exhaust hitting a huge area and stalling out. When the hot gas stalls out, the new gases trying to get out hit a wall.
I could also imagine the inside of a huge DP rusting from condensation. Mist can form if the gas is de-compressed so fast that the gas cools to a temperature that is less than the equilibrium vapor pressure of water at that reduced temperature. (called the Joule-Thompson effect). Its what causes those condensation cloud bursts on fighter jets. Not that anyone cares about that...just my mind wandering.
![Big Grin :D :D](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png)
But most likely Im just talking out of my ass cause Im bored and the huge DP would probably make alot of power. :tongue: