Updated: December 4, 2009
Black Hawk Engineering produces
CNC machined Metering Rods for Carter® YH and WFB Carburetors.
A very limitedrange of production metering rods and jets were available for these carburetors making precision tuning difficult. The carburetors were only used on a small number of relatively low production volume vehicles like turbocharged Corvairs and 6 cylinder Corvettes, so there is little aftermarket support. I wanted to change the mixture on our own cars and found that it is very difficult to fabricate metering rods without expensive manufacturing tooling. Since I have now successfully developed techniques for fabricating individual metering rods, I decided to offer the metering rods for sale to help others improve carburetion on their cars.
The formulation of gasoline has changed significantly since these carburetors were new. Federal and local smog laws have required extensive changes, particularly in the volatile components of gasoline. The current unleaded fuels are quite different than the leaded fuels for which the cars were designed 30 to 40 years ago. Even if your carburetor and engine are like new, the current gasoline may require mixture changes. If parts of your carburetor are worn, air leakage will also change your mixture.
In addition, modern oxygen sensor based air to fuel ratio gauges provide a much more accurate means of measuring the actual mixture supplied to the engine than was available at the time the cars were manufactured. This means that the mixture can be set more precisely for better fuel economy and performance.
Start by reading the Frequently Asked Questions page, Metering Rod FAQ.
If you are experienced tuning carburetors and know what specific characteristics you want to change, you can go to the Choosing a Custom Metering Rod page.
Hawk Engineering produces
Electronic Fuel Injection Throttle Bodies for Corvair® Engines
EFI for Turbocharged Engines
The Black Hawk Engineering YH EFI Throttle Body replaces the Carter YH carburetor used on turbocharged Corvair engines. The throttle body bolts on to the turbocharger compressor housing and uses the original air filter housing. No head modifications are required. The system uses a MegaSquirt control computer to control 2 pairs of injectors. The first pair is used for cruise and both pairs are used for boost. See www.msefi.com/ for details about the control computer. Other controllers such as Simple Digital Systems, www.sdsefi.com/, could also be used. Answers to Frequently Asked Questions here.
A complete system with a wide band oxygen sensor can be assembled for less than $3,000 plus shipping.
Here is a list of Suggested Vendors and Prices
Here is the detailed Installation Procedure.
The throttle body has a 1.83"
bore to fit the F flow (180 HP) turbocharger inlet bore. The Performance Trends
"Engine Analyzer" simulation software predicts that the throttle
body will flow 256 CFM versus 128 CFM for the original "180 HP"
YH carburetor. With the boost limited to 12 PSI for longevity, Engine Analyzer
predicts 193 HP net versus the 148 net HP of the stock "180 HP"
system. The EFI system is able to produce better fuel economy despite generating
more power. I will also manufacture smaller throttle bodies for the B-flow
(150 HP) turbochargers.
EFI for Carbureted Engines
RH EFI installed on a 102 HP engine for testing
The RH throttle bodies are now
available and ready
for testing. The RH
throttle bodies have 1.31" bores to match the carburetor mounting
pads on the Corvair cylinder heads. The throttle bodies will be available
in sets of 2 for 2 carburetor engines or sets of 4 for 4 carburetor engines.
The throttle bodies are designed to use the original throttle linkage crossbar
and air filter assemblies.
Answers to Frequently Asked Questions
The parts list with vendors and
prices for a full system is here.
The installation procedure is here.
say it can't be done should get out of the way of those who are doing it.
Jets & Metering Rods |
Metering Rods | Metering
Rod FAQ | Metering
Corvair Turbo Fuel Injection | Corvair non-turbo Fuel Injection | Corvair Fuel Injection FAQ | Port Injection
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e-mail Address: sales at blackhawkengr dot com Last Update: December 4, 2009 9:42 AM ©2000-2009 Black Hawk Engineering Designed By Liisa