4 cylinder and 2 exhausts

ananthkamath · 5th November 2005, 09:34

Chethan,

You are confusing backpressure with velocity. Velocity is dependent solely on the diameter of the pipe...smaller the pipe, higher the velocity cause the gas remains hotter....In other words, velocity is dynamic pressure;

If you read my original post, I never said there is no such term as backpressure; only that velocity is much more important in system design than is backpressure. I was refering to a system built from the ground-up, and not cut-and-hack type of mods.

In your cat case, you went to a large dia pipe and lost velocity. However, you also removed your cat and removed some backpressure. So that drastically reduced your low end.

When I have done my systems in the past I have never concentrated on the muffler. The muffler always comes at the end after tuned length has been determined by trial and error. Why trial & error? Because in the real world there are many factors which you cannot anticipate & design the system accordingly, especially if you have designed using something off the net. In my systems the muffler is only a length of tubing with perforations in it; nothing else. This doesnt mean, though, that the muffler has no effect at all on the system.

Max you're on the right track. I too recommend that you take the advice of a person who has experience and who actually sells well-known systems in the market, and not of some backyard experimenter who 's done "research" & some lame seat-of-the-pants testing.

v1p3r · 5th November 2005, 10:30

Quote:

Originally Posted by ananthkamath

When I have done my systems...
...muffler always comes at the end after tuned length has been determined by trial and error

Isn't that similar to this...

Quote:

Originally Posted by ananthkamath

and not of some backyard experimenter who 's done "research" & some lame seat-of-the-pants testing.

????

Please realise that not all of us are as qualified as you are. While we are happy to learn from your experiences and advice, and our own mistakes, there is no need to denigrate anyone's seat-of-the-pants testing.

For that matter, your method of quarter-mile times is tough to achieve, seeing the shortage of dragstrips, timing lights, and other facilities. Let's not even get started on dynos

I'm sure you will agree that we are all out to learn. I have learnt a lot from your posts, and I'm sure you look to learn from other people as well. Let's keep it that way...

ananthkamath · 5th November 2005, 16:00

Quote:

Originally Posted by v1p3r

Please realise that not all of us are as qualified as you are. While we are happy to learn from your experiences and advice, and our own mistakes, there is no need to denigrate anyone's seat-of-the-pants testing.

For that matter, your method of quarter-mile times is tough to achieve, seeing the shortage of dragstrips, timing lights, and other facilities. Let's not even get started on dynos

I'm sure you will agree that we are all out to learn. I have learnt a lot from your posts, and I'm sure you look to learn from other people as well. Let's keep it that way...

I understand your concern viper.

Maybe i have been too haughty but do understand that I have only returned a potshot taken at me by chethan.

Everyone here including you knows that I do not make any post unless I am damn sure of what I am talking about. I speak only from what I have seen and experienced. So I will not take kindly to criticisms like "some person who has read books/articles on gas flow and engines". I know very well that was aimed at me.

I spend many long hours in a day trying to share what I know here.
There is of course no tangible need for me to do that.

In the process of sharing information if I have sounded patronizing, I apologize. Do understand my point of view, which is that if I feel strongly about something, I will not hesitate to speak out against it. Enough misinformation has been circulated to the Indian enthusiast and I do not want a new comer to the field to develop an aversion due to this.

Once again I am sorry if I have offended anyone.

Ananth

chetanhanda · 6th November 2005, 19:43

Quote:

Originally Posted by ananthkamath

I understand your concern viper.
Maybe I have been too haughty but do understand that I have only returned a potshot taken at me by chethan.

what do you mean ? .. you were the on who started all this ...

Quote:

Originally Posted by ananthkamath

Could it be something known as MHP- Mental Horsepower?

and this ..

Quote:

Originally Posted by ananthkamath

Unless your aim is to experiment, not unlike me.

Quote:

Originally Posted by ananthkamath

The Backpressure theory is like an old wives'

so I think you were the one who took a potshot at me first.. I was just trying to tell the other guys what I had been doing ..
I was expecting suggestions ...anyways lets forget abt this ...
dont want to go off topic in this forum

max8791 · 7th November 2005, 23:55

so, everybody agrees that if 4 cylinders with 2 exhaust job is done by experience hand can increase performace.

Any idea where can i find somone in delhi or noida?

5th November 2005, 09:34	#16
ananthkamath Senior - BHPian Join Date: Jul 2005 Location: Mangalore Posts: 1,209 Thanked: 82 Times View My Garage	Chethan, You are confusing backpressure with velocity. Velocity is dependent solely on the diameter of the pipe...smaller the pipe, higher the velocity cause the gas remains hotter....In other words, velocity is dynamic pressure; If you read my original post, I never said there is no such term as backpressure; only that velocity is much more important in system design than is backpressure. I was refering to a system built from the ground-up, and not cut-and-hack type of mods. In your cat case, you went to a large dia pipe and lost velocity. However, you also removed your cat and removed some backpressure. So that drastically reduced your low end. When I have done my systems in the past I have never concentrated on the muffler. The muffler always comes at the end after tuned length has been determined by trial and error. Why trial & error? Because in the real world there are many factors which you cannot anticipate & design the system accordingly, especially if you have designed using something off the net. In my systems the muffler is only a length of tubing with perforations in it; nothing else. This doesnt mean, though, that the muffler has no effect at all on the system. Max you're on the right track. I too recommend that you take the advice of a person who has experience and who actually sells well-known systems in the market, and not of some backyard experimenter who 's done "research" & some lame seat-of-the-pants testing.
	() Thanks

7th November 2005, 23:55	#20
max8791 BHPian Join Date: Nov 2005 Location: delhi Posts: 44 Thanked: 3 Times	conclusion so, everybody agrees that if 4 cylinders with 2 exhaust job is done by experience hand can increase performace. Any idea where can i find somone in delhi or noida?
	() Thanks