Speaking of 4-2-1 extractors, this is the WRONG WAY to do it on a four cylinder engine! A 4-2-1 system must have cylinders #1 & #4 joined up, and #2 & #3 joined up, then further down those two pipes join into one. This is because four cylinder engines have a 180° crank, whereas virutally all V-8's have a 90° crank (the angle between the crankpins) and so the order in which the exhaust pulses come down the pipes is different. You can tell that the engine has these incorrent type of extractor on it, as they sound a lot like they have a dead cylinder and/or like a Subaru WRX.
Courtesy of Bill Sherwood, www.billzilla.org in his "engines: Exhaust" section.
Tue, 06 July 2004 07:30
