| [GMCnet] Re: - secondary's not opening - more info [message #365647 is a reply to message #365646] |
Fri, 23 July 2021 18:01   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Also, if you "Stomp" the accelerator clean to the floor at too low of an
RPM, it will bog. Feed the throttle in gradually. If that works, then the
problem is not in the Carb, but in your foot. If it still bogs, then you
have a problem with too weak of a spring on the secondaries. There are
various springs for different applications on GM vehicles. Lastly, If you
are still running the 3:07 to 1 differential ratio, a solution might be to
go to a 3:55 or 3:70 to 1 final drive ratio.
Jim Hupy
Salem, Oregon
On Fri, Jul 23, 2021 at 3:26 PM John R. Lebetski
wrote:
> When you rev it in park the secondary air valve should only slightly open
> visually. If it is flopping wide open the front dash pot is bad, vac hose
> to it is bad or spring on air valve set too lose. The front dashpot has a
> less than pin hole orifice to hold back the opening time after the vacuum
> to the pot drops. It should open gradually in gear under load as you floor
> it. Fuel is heavy compared to air an takes time to match the more rapidly
> accelerating air. If air valve opens too soon you get bog. If the front
> dashpot and hose to it are good, you can increase spring wind up tension on
> the air valve. You hold the flat blade scrre with a small driver, loosen
> the locking allen and slightly turn the screw for more tension, then tighten
> allen lock screw.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
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