Sunday, October 16, 2011

extractor 2.0

extractor or exhaust header is one most important component in a car exhaust system... as its name says, it extracts exhaust gas out from the engine into the exhaust down pipe... a tuned-length header does allows the engine exhale much more easily compare to stock exhaust manifold... mainly for a 4-cylinder exhaust header consist of 2 common configuration; 4-1 setup or 4-2-1 setup...

so how does a tuned-length extractor works??... given for example a 4-cylinder engine with a 4-2-1 exhaust manifold... when the first exhaust pulse exits the engine and travels down into the exhaust header, it creates low pressure behind which will then siphons out the second exhaust pulse... this allows the engine to exhale easily without having the piston to push out the exhaust pulse... siphoning effect will continue as long as the exhaust has travels out without clashing into each other at the primary joints... hence, it is important to have a tuned length extractor so that exhaust pulse will not clash with each other at joints...

besides having an ideal length extractor, primary and secondary piping size as well as smooth bends is equally important... mandrel bend is always the ideal choice as there is no reduction in piping diameter at bends... piping size go according to engine displacement... and smooth Y-joints are good to allow exhaust pulse flow smoothly from primary piping to the secondary piping....



my old extractor does not have nice bend in its piping as they are badly crushed bent... the material used already show sign of rusting...



so, i got it replaced with another cheap extractor... this one is made of aluminized steel which can resist rust far better than the old one... it also has better bend in the primary and secondary piping...



however, i made a mistake in purchasing a unit which is meant for Proton Wira... after fitting it to my car, i noticed it is slightly angled towards the center which came very close to the cross member...



the header was torched at the elbow section till it is smoking red to allow it to be forcefully bent away from the cross member... i also had it flexible pipe replaced with a 2 inch in diameter unit...



at the end of the extractor i made an adapter for easy fitting and removal of the exhaust piping... hence, now my exhaust system consist of 3 removable section; extractor, mid piping and muffler...

first impression, revs climb slightly smoother at mid-higher revs... overall gain was noticeable...

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