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Exhaust 5.7 HEMI Exhaust Discussion


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  #11  
Old 11-14-2013, 12:02 AM
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Quote:
Originally Posted by snrusnak View Post
You don't understand. I know exactly what you are saying as I noticed it on mine when I got it. There is an approximately 1/8" to 1/4" lip sticking into the y pipe from the 3" exit. This is what I'm talking about. This is actually better than a smooth transition.

I know, like I said above it seems like it would be a restriction to the flow of the exhaust gases, but it's not. This concept is most often used with intake manifold design.
I highly doubt it's better. Show me proof of this please. And not just random unverified internet riff raff...
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  #12  
Old 11-14-2013, 12:05 AM
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Quote:
You don't build your header pipes to stick into the exhaust port.
Most likely because that'd be damn near impossible, and extremely expensive, and there's limited room.

Like I said I might be wrong, just trying to apply what I know. Whether it's intake or exhaust I don't think matters, i.e. whether it's being pushed or pulled, it's still FLOW. (not capitalizing to be a jerk, just trying to show my point).
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  #13  
Old 11-14-2013, 12:07 AM
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lol it's not internet riff raff and I don't have a dyno result showing that an 1/8" lip on a exhaust inlet shows .25 hp increase. Just applying knowledge.

FWIW I do have a little knowledge behind this. I'm not just thinking that it's better. I'm applying what I know of flow to the situation. Again I could be wrong, I'm no "flow expert", but I don't think it makes a difference if it's being pulled(pre piston i.e. intake) or pushed(post piston i.e. exhaust). The same principal/theory would apply as far as I can tell.

Why does everyone always need hard evidence? Why don't you go dyno your truck with both y pipes and show the smooth transition is better? Oh because that'd cost hundreds of dollars and it's not worth it? Same reason I won't lol. Again, really not trying to be a jerk but you know damn well I don't have a dyno of this.

Do as you wish, I'm just trying to explain the reason it's like that(from what I can tell). Go ahead and cut away if you want, I'll still sleep tonight
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Last edited by snrusnak; 11-14-2013 at 12:13 AM.
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  #14  
Old 11-14-2013, 12:21 AM
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Not chasing HP here. I know the power difference is NIL. I just prefer smooth transitions and edges in exhaust systems because it affects sound. Most modern cars utilize the velocity stack/runner in a box concept. It's a proven thing on dryflow FI setups. I know all this.
Are you formally educated on all this and work in the trade..?
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  #15  
Old 11-14-2013, 12:25 AM
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As far as exhaust flow no. I am formally educated and learned a lot about fluid flow, however. This is certainly different than flow of gases. I have learned some about gas flow on my own mainly out of curiousity/hobby. Again, no expert, just applying what knowledge I have, and I could be wrong. But it is a pretty well known and accepted fact that this theory holds true in intake manifold flow, so why wouldn't it in exhaust flow? Flow is flow, as far as I can tell.

This probably doesn't help my point, but I'm cutting the magnaflow y pipe off my truck thanksgiving weekend lol.
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Old 11-14-2013, 12:28 AM
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Built natural gas compressor pumping stations for more years then i care to remember,vacumn and pressure are differant.
Every transition in a pressurized piping system uses a smooth transition to step down.
You can get away with feeding a smaller pipe into a bigger pipe,with a lip at the step,as long as the smaller pipe is the feed pipe,if you turn that around,and the bigger pipe is the feed pipe,then you want a smooth transition under pressure.
In this case you have two small pipes feeding a bigger pipe under pressure,with the lip facing flow,under pressure that lip causes turbulance that effectively reduces the surface area you have to force exhaust flow through.
If your theory worked, header collectors are built back-asswards then

Last edited by Hornet; 11-14-2013 at 12:34 AM.
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  #17  
Old 11-14-2013, 12:31 AM
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^there's some experience speaking. What makes you say it matters? Just curious how that was concluded.

Doesn't make sense to me, but there may be something I'm not aware of. I just don't see the difference between pushing or pulling the gas.
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  #18  
Old 11-14-2013, 12:33 AM
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So we can agree that a sharp squared off edge will hurt performance/impede flow... Sure maybe .25Hp. Where as a gentle radius will out perform out flow anytime any day... I've tested sharp edges versus a radius/taper/mushroom and there is power on the table. I built an air cleaner setup with these radius properties incorporated for a 454 BBC and it made 13HP on the dyno. I'm a machinist by trade. I've built many engines and many exhaust systems. And now currently build high performance muscle cars full time.
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  #19  
Old 11-14-2013, 12:38 AM
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I dunno, I don't think either of us know for 100% certainty either way lol. I'm just giving my .02 from what I know. I'd say 50/50 chance I'm right or wrong. All I know for certain is it really won't matter too much either way. Also, I'm positive I"m very tired and have to get up early .
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Old 11-14-2013, 12:43 AM
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I'll still take it off your hands,lol.
No point in getting sparks in your eyes from the grinder

Hows the rain up there today,gotta make it entertaining driving,lol.

Sean it's always easier to push a gas then pull it,you can get more volume in a pipe that uses pressure to move a gas,then you can in a pipe that uses vacumn to move that same gas,consequently the need for smoother transitions under pressure,as you're physically moving more volume

Last edited by Hornet; 11-14-2013 at 12:47 AM. Reason: spelling sucks tonight
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