Quote:
Originally Posted by PTAddict
I have no experience with any of the above, although I've researched a lot and plan to add a Harrop system in my car in the next couple of years.
That's because the close proximity of the throttle blades to the intake valves creates a much smaller total intake volume that is under vacuum, and therefore a smaller volume of exhaust reversion during overlap.
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But that scenario goes away when you introduce a common plenum of any significance, whether it's an IR or not. I'll stick with my own opinion and personal experiences. Thank you for yours though.