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1985 Mercury Capri - The Big Gulp



1985 Mercury Capri 1 Inch Carburetor Spacer
The factory carb sat on this 1-inch, four-hole spacer.		 1985 Mercury Capri Installing Speed Demon Carburetor
We bolted the Speed Demon in place of the factory carb.		 1985 Mercury Capri 575 Cfm Speed Demon Carburetor
Speed Demon carburetors measure between 575 and 850 cfm. They come with no choke installed, though one can be added. This version of the 575 has 1.280-inch venturis, twin squirters, and annular boosters.
1985 Mercury Capri Billet Metering Blocks On Speed Demon Carburetor
The BG carb also has billet metering blocks and baseplate, and two 30cc pumps.		 1985 Mercury Capri New Fuel Line
It was necessary to fabricate a new fuel line to accommodate the BG carb.		 1985 Mercury Capri Barry Grant Speed Demon Carburetor Installed
We connected our fuel line to the dual-feed line, which was supplied by BG (but does not come with the carb). After starting the engine and checking for leaks, we set the idle speed and ran a few tests. On the best run, we saw a gain of 4 hp, bringing the total to 220 at the wheels.
1985 Mercury Capri Professional Products Airflo
We then tried the Airflo from Professional Products. This unit is designed to smooth the airflow and help it turn down into the carb. Unfortunately, we saw no gain in power.		 1985 Mercury Capri Installing Professional Products Airflo
This is one item that may work in some applications and not in others, but for around $25 it was worth a shot. Note: We also tried the Airflo once more after swapping the manifold, and the results were the same. We're gonna try it again in our strip testing because, frankly, we're intrigued by the concept.		 1985 Mercury Capri Removing Stock Manifold
The stock manifold went bye-bye.
1985 Mercury Capri Intake Manifold Comparison
The aluminum stocker (right) will be replaced with the Weiand Stealth.		 1985 Mercury Capri Weiand Stealth High Rise Intake Vs Stock Manifold
While both manifolds are of the dual-plane design, the Stealth is a high-rise, meaning the carb sits up higher, thus the plenum area is increased. The Stealth also has larger ports that allow the mixture to flow into the heads at a more advantageous angle.		 1985 Mercury Capri Installing Weiand Dual Plane Intake
Glenn Knell of Crazy Horse Racing bolted on the Weiand Stealth. When tightening a manifold, start from the center and work your way outward while going from side to side.
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Related Photos

1985 Mercury Capri Installation Workshop 1985 Mercury Capri Stock 302ci H O Engine 1985 Mercury Capri Weiand Stealth Pual Plane Intake
1985 Mercury Capri Weiand Intake And Barry Grant Demon Carburetor 1985 Mercury Capri Barry Grant 575 Speed Demon Carburetor 1985 Mercury Capri Removing Stock Air Filter

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