That's cool, Leigh-
did Carb Connection do the work?
The raw numbers seem low- which, often, is a good sign. They're not trying to
shine you on with artificial corrections. A chassis dyno's really good for
comparing 'before/after' mods, but the absolute numbers often don't mean too
much.
If they recommended a bigger air corrector ('air jet') then they think you're
running rich in the mid- upper range. And that may be true- up to a certain
point, leaner DOES make more power. It's very engine- dependent, though. Look
at the tailpipes of most race cars- they're grey- to- white in color, meaning
that they are running significantly leaner than any street car should.
If they didn't over- smooth the numbers, that's a nice, even curve- you may be
hard- pressed to make much of a change and keep it looking so good!
As to the '17.5' number, it's just a hole that the computer picked up- possibly
from an off- idle transition, or even from before the engine was started!
Toby
also in Seattle
-------------- Original message --------------
From: Leigh Brooks <shifty@shiftco.com>
> I took Zippy to get some dyno tuning, here's the results:
>
> 1969 2000
> "A" cam
> 44 PHH Mikuni Solex
> Fuel Jet: 135
> Air Jet: 140
> Pilot Jet: 55
> Accel. Jet: 35
>
>
> Max Horsepower: 89.4
> Max Torque: 101.4
> Max Air/Fuel: 17.5
>
> http://www.shiftco.com/features/zippy/dyno/power_torque.jpg
>
> http://www.shiftco.com/features/zippy/dyno/air_fuel.jpg
>
> Tuner recommended a 150 idle jet (air jet?). Said it was pretty close
> and he synched the carbs a bit.
>
> Leigh Brooks
> NWDE
> Seattle
|
