Mark Steitle wrote:

I've Attached two pictures of one exhaust port (inside and out) from my
20B.  While looking it over yesterday, I noticed a small (approx. 1/8")
slot along the top of the port.  It has a diverter running lengthwise that
forms the lower lip of the slot.  The slot feeds the EGR system.  My
question is what, if anything, should/could be done with this to improve
power?  It looks nothing like the exhaust port insert in my old (junker)
'89 N/A 13B.

The second picture shows the outside view of the exhaust port, which is a
rather odd shape.  The insert has a passage inside so as to prevent taking
a die grinder and rounding the port.  Is there an improvement waiting to
spring forth here, or should I just leave well enough alone?  Does someone
sell a replacement insert that will give me lots of free hp?  ;-)

Mark S.

We usually block off the EGR else where so the whole EGR system will pressurize and
there will be little or no net flow. Now in theory it could act as a helmholzt(s?) resonator
and affect the pressure pulse in the exhaust port but I do not know if anything
bad is going on becasue of this.

Paul Lamar

 
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