No collector = No power, Huh? Options

[bd1308]

I know nothing about exhausts. Ive never had to mess with them.

I wanna HEAR my engine, so I'm building a exhaust.

I have a design that has backpressure, but no collector.

Is a system with matched length the best type of system, as shown in the figure?

And Is the use of a collector correctly used?

Hope its not too crude.

[Twystd1]

I know nothing about exhausts. Ive never had to mess with them.

I wanna HEAR my engine, so I'm building a exhaust.

I have a design that has backpressure, but no collector.

Is a system with matched length the best type of system, as shown in the figure?

And Is the use of a collector correctly used?

Hope its not too crude.

Well....

To be honest with you.
Your basic design will work.
And you will be able to HEAR your engine as you show no muffler.

And unlees you get the primary's and secondary lenghts correct and use the appropriate collectors and muffler system.

You may well loose HP over a stock system.

I realize your drawing was rudimentary and doesn't show the real details of your thoughts.

So I suggest you make a better drawing to show us some detail. And that I will make comment on directly.

Note: My thinking is that the your 4 into 2 into 1 system is a good thought. Much like the newer Tangerine system.
http://www.tangerineracing.com/Super_Header.htm

Now my OPINION about teener headers (And I am far from an expert)

The following is based on a 1.7 to a 2.5 engine under a 150HP

Using at least 1.5 ID Tubing.on the primary's and 2.00 or 2.25 on the secondary's
and finishing with 2.5 to 3.0 on the final collector to muffler.

You primarys and secondary's cumulatively should be about 30-32 inches long or a bit longer. And NOT shorter than that. This excludes final collector length. and does include your first 2 into 1 collector length.
A longer final collector 8 inches+ is better than a short collector. It may be easier to buy stub pipes than make them. (If you use them at all)
You can buy them already made from george narbell at europeon header.
Or have Thomas EDM you a set of flanges and make your own stubb pipes.

Or have Tiger at A1 set you up. (Google A1 Muffler in Santa Ana, Ca.)

remember that stub pipes need a tweak in them as they go pst the pushrod tube.

Unless you machine up custom pushrod tubes that are machined in a rectangle at the point where the stub goes past them. (It works by the way)

If ya need any reading materials on header design. take a look at the following.

1) http://www.stahlheaders.com/documents.htm
2) http://www.burnsstainless.com
3) http://www.stans-headers.com/faq.htm (ask Stan any question. he rocks)

And you may want to search up "Headers" over at the STF forums and see what ya learn. (Theres a lot to learn there if ya search)

http://www.shoptalkforums.com/viewforum.php?f=1 (Tunas Forum)
AND
http://www.shoptalkforums.com/viewforum.php?f=47 (Jakes Forum)

There have been several good header building discussions on this forum also.

Bottom line... Hell go for it. You will learn a ton doing this and the worst that can happen is you will learn a bunch of new stuff.

I do have a question for you... If ya just want your engine exhaust louder. All ya need to do is put a loud muffler on whatever exhaust you already have.
Thats CHEAP..!!!

If you are looking to advance your performance. You have got a bit "O" homework to do. IMHO...

Take a look at Jakes site and read about the header tests he perfomed.
You will find it enlightning. (I did)

Regards, And have a great time learning..!!!!! (IMG:style_emoticons/default/thumb3d.gif)

Clayton