Cam selection

[Jim Green]

--- John Larson <j.d.larson at verizon.net> wrote:
> Tess asked, "p.s. - I'm still looking to find
> opinions from folks on the
> Schrick 272
> and 276 cams... do they pass WA smog?"
> 
> The big problem is HCs.  Because "performance"
> camshafts feature higher lift
> and longer duration, we see a combined problem of
> improper vacuum/air flow
> levels and poor combustion of what fuel gets in
> there at idle.  With a 272,
> numbers may range from 400-2000 ppm at idle, far too
> high to pass ANY
> tailpipe standards anywhere they have emissions
> testing.  A 276 will be
> worse.  Furthermore, you're gonna lose low end
> driveability with anything
> other than the stock cam.  Remember, after mandated
> emissions levels, auto
> manufacturers are concerned with mileage (well some,
> anyway) and performance
> numbers and "feel.

Alright, here's my BTDT with the Blau 272 cam and my
car which is not exactly normal, but.. 

The car passed dyno testes emmisions with no cat, and
for the mostpart, an eyeballed butt dyno tune with
room to spare on pretty much all readings.  So how
John can say it will never pass emissions is beyond
me.

You will loose a little power down low, but I doubt
you'll even notice.  The power up high is well worth
it and I'm guessing you'll like that since you do race
cars from time to time right Tess?

=====
Jim Green
'89 90tq
'89 80q
http://www.mswanson.com/~jgreen/car_home.html


		
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