Custom Exhaust, just want to see what people have done |
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Custom Exhaust, just want to see what people have done |
turnaround89 |
Nov 21 2008, 12:55 AM
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#1
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Senior Member Group: Members Posts: 671 Joined: 17-May 08 From: Rockford, Illinois Member No.: 9,067 Region Association: Upper MidWest |
I am wondering if it would be possible to fab up my own exhaust system for my 1.8L engine. I figure i might be able to save some money this way, instead of buying a brand new one from AA or whomever and i'll learn how to make an exhaust as well. Just wanted to see what other people have done and how they went about it. Pictures would be great. I plan on getting rid of the heat exchangers if that helps out at all!
Thanks in advance everybody!! |
r_towle |
Nov 22 2008, 01:29 PM
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#2
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
If you are planning on a custom exhaust system while retaining the stock HE's you need to measure the length of the HE's primaries and try to add length to the short ones and match all four before the muffler.
The Bursch muffler with its collector attempts to do just this. Any bolt on solution that does not match the primaries does work, but not optimal. If you look at what Foley has done, this is a tuned setup specifically designed to scavange in the best possible way with the 4-2-1 setup. Notice the 4-2-1 setup uses opposing cylinders and scavanges based upon the timing of each combustion event. This is critical...you want to use the combustion event timing to increase scanvanging. The HE's dont do this anywhere. They run 4 unequal pipes to the muffler...again Bursch tries to do this with the collector. The Stock 2.0 liter muffler does this within the muffler itself, but it also not optimal. Old school drag racers (VW motors) used just 4 pipes hanging in the wind, about 1 foot long each. That worked but many people learned about scavanging and rapidly changed to a different design. The type one systems, and any drag racing header (4-1) is designed for WOT only..the rest of the range of operation does suffer. the 4-2-1 system is really the best design for smooth power throughout the range of performance and driving. Rich |
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