New 20b intake plenum and runners

gmonsen · 02-05-2011, 11:35 AM

My5ABaby... Yep. All the pretty stuff doesn't mean much, if it doesn't do the job. I think it will. The runners are bigger at the plenum and stock at the flange, so a lot more taper and thus velocity. The effect of the greater taper is especially notable on the primaries, since they go from 2.1 inches at the plenum to 1.25 inches at the flange. The plenum is 4 times the volume of the stock 20b plenum, so it will have the volume it needs at high rpm. Does that mean it will work the way I hope? Absolutely not, of course. But, a lot of the intake and exhaust work is as much art as science and a lot comes from experimenting. One way or the other, I'll learn a lot from this.

Gordon

02-05-2011, 11:35 AM	#34
gmonsen The Ancient One Join Date: Mar 2008 Location: Eastern Pennsylvania Posts: 144 Rep Power: 18	My5ABaby... Yep. All the pretty stuff doesn't mean much, if it doesn't do the job. I think it will. The runners are bigger at the plenum and stock at the flange, so a lot more taper and thus velocity. The effect of the greater taper is especially notable on the primaries, since they go from 2.1 inches at the plenum to 1.25 inches at the flange. The plenum is 4 times the volume of the stock 20b plenum, so it will have the volume it needs at high rpm. Does that mean it will work the way I hope? Absolutely not, of course. But, a lot of the intake and exhaust work is as much art as science and a lot comes from experimenting. One way or the other, I'll learn a lot from this. Gordon __________________ 1993 Rx7 R1 20b NA 1994 Rx7 20b supercharged project 1991 BMW 850 6 speed 1991 BMW E30 M3 Evo II