Quote:
Originally Posted by Ollies930
I do not believe that the collector design has all that much bearing on the performance of the engine. There was a dyno test years ago, where merge collectors were compared to simple weld collectors. The merge collectors made a bit more peak power, where the standard collectors had a wider power band. I think that the length of primary has more effect than the collector design itself. Supposedly the angle of the collector has some effect on the width of the powercurve, but as always it is a tradeoff. If there were any measurable benefit to cone shaped collectors vs flat collectors, then I am sure Porsche would have used them on the 934/935/962, etc.
But the Burns stuff sure looks great and is prefabricated, so if you were to start from scratch, then Burns collectors would be a time saver.
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The ones you mention are all turbos. I would think the collector matters less in those cases?
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