NZ Performance Car - - Tech Guide -

The most af­ford­able man­i­fold by far is the log man­i­fold. Log man­i­folds are used in fac­tory ap­pli­ca­tions, as they’re a very sim­ple de­sign and can be cast, to keep costs down, but if fab­ri­cated they’re sim­ply cheaper be­cause less ma­te­ri­als are used. As well as be­ing easy and af­ford­able to man­u­fac­ture, they are ex­tremely com­pact com­pared to a tubu­lar man­i­fold, which is de­sir­able in some ap­pli­ca­tions. How­ever, log man­i­folds are the worst-per­form­ing de­sign in the mar­ket, so if you’re af­ter big power this isn’t the way to go. They don’t fac­tor in dif­fer­ent run­ner lengths, and all the ex­haust gases run into a com­mon cham­ber, so ex­haust pulses col­lide and cause a huge drop in per­for­mance.

Short run­ner length also makes for more heat thanks to the smaller sur­face area, so heat doesn’t have as much chance to dis­si­pate, and that can cause crack­ing and dam­age. Such a re­stric­tive de­sign means th­ese man­i­folds are only suit­able for low pres­sure and near stock ap­pli­ca­tions.

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