Bill,
I checked Summit Racing’s web site and they have a product called Adjust-A-Jet that might work. Its not exactly what I was thinking of, but close. Here is the description…
Metering Block, Adjust-A-Jet, Billet Aluminum, Purple Anodized, Holley, 2300/4150/4160/4150HP, Each
Never mess with jets again.
The Adjust-A-Jet from Percy's High Performance means you'll never have to tear apart your carb to swap jets again. No rushing during qualifiers, no messing around between heats, no worrying about gas spilling onto a hot engine, no more hurried gasket replacements. The plate is infinitely adjustable, and can be tuned while the engine is running for instant adjustments. The main metering is infinitely adjustable too. Plus, everything you've ever learned about Holley still applies.
I actually have one of the Holly manual mixture adjusters. It replaces the metering block in the Holly carburetor and allows a/f adjustment while driving. But I have no idea where it was purchased from, or if it is even still available. I got it from my dad who has long passed away. I’ll check with the one local speed shop here in Austin and see if they can shed some light on it. There are a bunch of old-timers running the place. So, if anybody will know, it would likely be one of them.
Mark
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of wrjjrs@aol.com
Sent: Tuesday, October 31, 2006 9:47 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: fuel pumps
Sorry to say Mark most speed shop personel will give you the "deer in the headlights" look if you talk about leaning. In fact some corporate shops won't sell you parts if you mention and airplane FWIW. Check the back of Aerotrader for some of the small sales establishments.
-----Original Message-----
From: mark.steitle@austin.utexas.edu
To: flyrotary@lancaironline.net
Sent: Tue, 31 Oct 2006 5:28 AM
Subject: [FlyRotary] Re: fuel pumps
Someone makes an adapter for Holly carbs that allow on-the-fly mixture control. Not sure of who, but I bet a good speed shop would know.
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of david mccandless
Sent: Monday, October 30, 2006 10:58 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: fuel pumps
You just need 3.5 Psi for the Weber. Although I use 6 Psi in the race car. And some carb tricks on top of that.
do you have any ideas on methods to lean a weber, or any carb for that matter, for altitude mixture adjustment. I have heard of a vacuum line to the inlet manifold thru a needle valve to the fuel bowl, then vary the pressure head in the fuel bowl. And, jetting the carb at sea level with the choke on, and then backing off the choke as the airplane climbs.
Any comments or suggestions?
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