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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