1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Grinding a manifold

Discussion in 'Engine Building' started by d17type-R, Mar 30, 2007.

  1. d17type-R

    d17type-R Doc Brown says

    Likes Received:
    Sep 21, 2006
    Langley BC
    Here's something I wanted to try for fun...

    My stock manifold onmy 1.7 SOHC has really tiny holes and what look like sleeves.... I thought of taking a Die Grinder and smoothing out the flow that goes into it. It's just something to try in my spare time... sort of a "Hey, I wonder what would happen if" sort of deal.

    I have researched it a little and from what I found... an aftermarket Cat will only yield a possible gain of a whopping 1HP
    (this information comes from my buddy's 93 Accord Sedan with an H22A swap done: he has the laptop set up in the car and we measured it using both the Chrome and Uberdata programs before and after. so I think it's fair to say that spending money on a supposed "High-Flow" Cat is a big waste especially in my application.

    So with that said, before I go and grind this thing can anyone forsee any error codes popping up? I'll re-iterate that I only want to try grinding the inlet ports of the stock manifold. The manifold had the 2 O2 sensors (one before and one after)

    That's why it's such a pain in my ass to find an aftermarket CAT at a non-rape price point

    I appreciate any and all input.
  2. TurboMirage

    TurboMirage YEEAAAHHH VIP

    Likes Received:
    May 20, 2003
    Central, MA
    i dont see what harm it could do.
  3. klyph

    klyph Dismember VIP

    Likes Received:
    Aug 14, 2006
    North Pole, AK
    Yeah, custom means grab that grinder and tear it up y0.
Draft saved Draft deleted

Share This Page