US Headers & Exhausts NA

[tbro]

SHEEET!!!ahhhhhhhhhh,
me thinkem me showem to mr stewart@ gls. He mite make some goodly copy for racing cars to go more faster, good idea Plohl
mr gary be very gracious and makem for you and me too.

[project.r.racing]

Do you even understand what tuned means?

Gas flow rates to the collector from each outlet. Arrive same time.

Have you looked at the pictures? The primary on cyl 1 must be at least 10cm longer than all the rest.

I'll do a outer diameter measurement of the cyl 1 tube compared to the others. The inner diameter of a section/s on the cyl1 should be a touch thinner but how do you know?

length of runners! not diameter.

Diameter also affects how fast fluids flow through it. Say a garden hose with the same water pressure will push water through faster than say a drain pipe.

So you would expect the primary on cyl one to have a slightly smaller internal diameter to tune it to compensate for thevextra length.

Someone asked you a question whether or not you knew what tuned was. Clearly by your answers you dont understand.

You are telling us that the diameter for 1 pipe will be smaller to allow the gases to move faster than the other pipes. So the pressure from the pipe will be higher that be pressure from the other pipes when hitting the collector.

If this is how these pipes have been design. Then they are not tuned. Simple.

What you would actually expect from the cyl 1 piping is next to no loop on it.

[sailaholic]

If each cyclinder creates the same volume of gas why would you make one primary smaller?

[project.r.racing]

Do you even understand what tuned means?

Gas flow rates to the collector from each outlet. Arrive same time.

If each cyclinder creates the same volume of gas why would you make one primary smaller?

Because it was longer than the others.

Then gas flow rates will be different.

[project.r.racing]

If each cyclinder creates the same volume of gas why would you make one primary smaller?

Extractor manifolds
Most non-turbo performance cars and high-performance four-stroke motorcycles use extractor manifolds, as do most non-turbo racing cars. Extractor manifolds are also available as aftermarket accessories to suit many engines.

Extractor manifolds offer the following advantages over the simple manifolds often fitted to non-performance engines:

Separating the gas flows from the individual cylinders so that undesirable inter-cylinder interference is avoided.

Maintaining an optimum gas velocity by carefully chosen tube diameter.


Allowing the individual cylinders to assist one another by means of the negative pressure waves generated at the collector, where the individual exhausts merge.[3]
This type of exhaust system can be used with or without a muffler, and so can be used on both race and road vehicles.

nice wiki copy and paste.

but changing the diameter of a single pipe alone will screw up theories you just copied and pasted.

[emily_mx5]

This is so hilarious.
Please continue.

[sailaholic]

The problem is you can't understand. My question is not because I didn't understand extractors. It was asking you to think about your reason for making one tube smaller.

A given volume of air will have an optimum size primary. You then lengthen of shorten primary's to match each other and desired rev range.

Making one tube smaller means non optimum gas flow in that one. This means more restriction so more gas left in the cylinder when the intake charge starts trying to get in.

[greenltd]

Dupain is great. On at least two threads showing us his level of intelligence. ...... should learn to shut up.

[sailaholic]

*facepalm* you can lead a horse to water...

[project.r.racing]

All I can say from this point on is - get an education.

[hks_kansei]

Dupain, you should also ask if they can do a custom set for you in aluminium.

Because it's a lot lighter than steel you would get the performance gain from the tuned diameters, and a good weight reduction.


Even better would be magnesium, but that's getting expensive.

[project.r.racing]

All I can say from this point on is - get an education.

Can't help you if you can't understand.

Judging from the posts in this thread. Only you seem be be the one without understanding on this matter.

The more you type, the more understanding and you grow further apart. I think it is currently 2 kilometers and growing.

I've even highlighted the errors between you own thoughts and what you copied and pasted from wiki, and you are still saying we dont understand. You clearly dont understand it. you look straight past them only to challenge others understanding.

[ED_MX5]

This is so hilarious.
Please continue.

Maybe words from a shelia can sort out the queries. I've tried my best to explain.

I have to butt in here.
Have your discussion with others sure, you may differ in oppinions/knowledge.
Some people here know lots, some know a little. Just be aware that being a SHEILA has nothing to do with knowledge! If your going to criticise, just get them to prove why they are right. Being sexist is not going to solve your problem mate.

Good luck with your car btw, looking good. Hopefully will sound good too.

[project.r.racing]

This is so hilarious.
Please continue.

Maybe words from a shelia can sort out the queries. I've tried my best to explain.

I have to butt in here.
Have your discussion with others sure, you may differ in oppinions/knowledge.
Some people here know lots, some know a little. Just be aware that being a SHEILA has nothing to do with knowledge! If your going to criticise, just get them to prove why they are right. Being sexist is not going to solve your problem mate.

Good luck with your car btw, looking good. Hopefully will sound good too.

Why would emily_mx5 find it so hilarious? Where is the documented evidence of their definition ED_MX5? I've provided a definition from wiki and there are others easily found.

The wiki definition is fine.

But what you describe as unequal length runners and different ID size pipes is not what tuned length headers are.

The problem is that your definition and wikis definition are different.

Deal with it and grow up. Get educated.

[project.r.racing]

This is so hilarious.
Please continue.

Maybe words from a shelia can sort out the queries. I've tried my best to explain.

I have to butt in here.
Have your discussion with others sure, you may differ in oppinions/knowledge.
Some people here know lots, some know a little. Just be aware that being a SHEILA has nothing to do with knowledge! If your going to criticise, just get them to prove why they are right. Being sexist is not going to solve your problem mate.

Good luck with your car btw, looking good. Hopefully will sound good too.

Why would emily_mx5 find it so hilarious? Where is the documented evidence of their definition ED_MX5? I've provided a definition from wiki and there are others easily found.

The wiki definition is fine.

But what you describe as unequal length runners and different ID size pipes is not what tuned length headers are.

The problem is that your definition and wikis definition are different.

Deal with it and grow up. Get educated.

Where's you evidence project-r-racing? I have told you I'll review the product when I get it. My definition is the same as wiki. Whats this about abusing me about getting an education. Have two degrees from Sydney University and one was Chemical Engineering and it included fluid dynamics 1&2.

If you understand fluid dynamics, the you should understand that changing pipe lengths and diameters change fluid velocity and vaccuum between 2 merging fluids.

So if you want 4 pipes to flow evenly into 1 singlepipe, wouldn't you want all of those 4 pipe to have the same resistence and velocity???

Otherwise the vaccumm created by 1 going at a faster velocity will also mess up the other 3???

By changing 1 pipe to a smaller diameter, that will create resistance at the start of the pipe, and increased velocity at the end of that same pipe.

So you change 1 pipe to be slight smaller diamter than the other 3. You create more resistance. You have less exhaust scavenging. So you have already decrease power from cylinder 1. Finally the gasses hit the collect at a high velocity upsetting the equal vaccuum created from the other 3 pipes.

All pipes need to be the same size to give equal resistence and gas velocity.
All pipe need to be equal length so the gases hit the collector and the vaccuum is equally controlled.

If you dont have this, you might as well just by a quick welded $250 header job from mr muffler down the road. Cos you'll only get the same results. Although mr mufflers will be made from cast iron and last 10x longer.

Lets go mr 2 degrees. Explain fluid dynamics to us?