Well let me ask this then. The port is only open for a short amount of time right? So isint any time or air wasted in building up/creating this "air wedge" reducing overall efficiency? Also isint the sleeve insert reducing turbulence at the end of the port? I see your point, and it sounds plausable IF the port was flowing full time, (like the river). But since it opens and closes you lose that "air wedge" after every port closing (reversion) and consequently on port opening it needs to build back up. And that wastes precious time that we dont have to spare, especially at hi rpms. IMHO (just a gut feeling) I dont think you have the port open long enough for the air to build a wedge. Doesnt it take time for the air to compress in that corner and become a wedge?

 

This is an excellent point. Transient behavior can be quite different from steady state.

You're right, the wedge has to develop and this takes time, but keep in mind that the port doesn't fully open right away. There is time for the flow behavior to develop as the port opens. Also, the flow WANTS to flow from high pressure to low so if the mass is low and the pressure drop is high, there won't be much initial momentum to knock the pressure wave into the back of the sleeve. My guess is that it will mostly go right through the port initially.

 

Hence the port being designed as such in the first place .

~T.J.

 

sorry for the interuption to this debate.. due to the fact I fell asleep in physics 101.102 & 103... are the Pineapple sleeves worth it then?

 

from what i hear just for a on the street car they are not worth the effort or money. If you were building a super high performance race car and fighting for every single horse i assume they would be worth it.

 

I can't think of a strong reason why they should work.

 

man....................

Wasn't this a bout exhaust and what u think of the different primary setups? Anyone have pis of the true duals?


You guys are going too far, atleast for me. I think you are on another level with this debate.

thnx

 

come on i need a pic!!
please....lol

 

What do you mean by "true duals"? The RB system is two pipes all the way into the muffler. After that, I dont know what happens though. They might collect, or they might stay seperate and each come out a seperate tip. Either way, heres a picture. In the picture, you cant really tell, but there are actually two pipes that go into the muffler, not just one.

~T.J.

 

i guess what i mean is my friend had his race header piped to two seperate mufflers then mounted side by side. i never knew the rb exhaust in the piture is 2 pipes going into the muffler. But do they stay seperated in the muffler also or is their a gas mixture or a 'y' pipe in it?

 

Like I said, I dont know what happens after the two pipes go into the muffler.

Also, RB makes different setups. The one I showed you is the Street Port setup. This makes the most power on a street ported engine (go figure). The standard exhaust system is only a single pipe that collects at the header.

~T.J.

 

The exhuast set above does not have two pipes going into the muffler. The duals collect just in front of the axle "hump" right after the presilencer muffler flanges.What makes it a "Street port" exhaust is where the two exhaust pipes collect, this one very far back. Regular RB exhaust usually collect before the presilencers in the header section. True duals I assume would be each housings going through a single presilencer and having it own dynomax super turbo muffler (or insert your won muffler here) (those are the ones I see around here) on the right side.

 

RIGHT !!!
That the setup i'm thinking of too. Do you think you can find a picture of that on or off a car? And what do you think the pro/con of this setup are?

thnx

 

Dual all the way back-

Cons: weighs more, flows less, looks ugly, more expensive...

Pros: none.

An explanation will bring on a debate, so I will not... you have to trust me.

 

What the hell would you know, u dont even know that your "Hachi" is a '87 not '88 (pos)......lol


thanks anyways

 

Are you ok? Look again, get some glasses to go with your dentures.

 

good u fixed it, now fix the car lame ***!

hahaha

 

This vs. your cars? How they running?!? Getting a good 5yrs per gallon? Tires still at 99% after 4 yrs? No emissions...EVER?

 

Is anybody running a true dual primary set up with out any X or H pipe connections?
There's gotta be at least 1 piture out there!