| What are the holes in plenum floor (behind TB opening) for? |
Subject: What are the holes in plenum floor (behind TB opening) for? by 89Vette on 2011/2/5 4:56:02 I had thought they were intake ports for IAC-fed air. And, that the air made it's way down to the small holes in the floor of the base (small holes located in each runner). In a recent CF thread, it was stated that EGR gases are forced up/out thru those holes. And, that the "blocks" commonly removed for porting were put there to aid in mixing. I had gotten the impression the blocks were there to slow -- and help divert -- air into (down thru) those tubes for IAC idle air. What's the scoop on EGR, IAC, and CSI passage-ways in a TPI base? IOW, what's their routing? (I already sold my oem base, so I can't go recheck myself. And, FWIW, the question goes to heating/cooling the intake.... Does EGR air raise intake temps at all? Does the coolant [under the TB] do anything more than prevent TB-blade icing in severe cold?) |
