The Engine That Made the Car: How a Yamaha V6 Turned the Taurus Into the SHO

In the late 1980s, the Ford Taurus was the most mainstream car in America: a jellybean-shaped family sedan built to haul groceries and carpool kids. Then, in 1989, Ford slipped a different engine under the hood and gave the badge three extra letters. The Taurus SHO, short for Super High Output, was still a four-door family car, but its heart came from Yamaha, and it changed what people thought a Taurus could be.

It is one of the clearest cases in American car history where the engine is the whole story. Take the Yamaha V6 out of the SHO and you are left with a well-handled Taurus. Leave it in, and you have a sleeper that, in the words of Hagerty, Ford positioned as its answer to the BMW M5.

A Japanese Motorcycle Company Gets a Call From Dearborn

The story starts in 1984, when Yamaha Motor Corporation signed a contract with Ford to develop, produce, and supply a compact 60-degree DOHC V6 based on the existing Vulcan engine, designed to sit sideways in a front-drive car. According to Hagerty, the first Taurus SHO prototype was built in 1986 by engineers Mike Klein and Will Johnston at Carron & Company in Inkster, Michigan, with Ford's Special Vehicle Operations group backing the idea. After testing in Michigan, the prototype was shipped to Japan for Yamaha to evaluate.

Yamaha was an inspired choice. The company's engine résumé already stretched well beyond motorcycles, from its work on the Toyota 2000GT to a Formula 1-derived supercar project we have covered in the past, the Yamaha F1-engined prototype. Building a high-revving V6 for a family sedan was well within its wheelhouse.

What Made the SHO V6 So Unusual

On paper, the SHO V6 looked related to the humble Vulcan V6 found in ordinary Tauruses. It shared the Vulcan's 60-degree cylinder angle, bore, stroke, bore spacing, and a few minor components. Past that point, it was an entirely different animal: Yamaha designed and built it with new DOHC cylinder heads and a redesigned, strengthened block.

The details are the interesting part. The 3.0-liter (2,986 cc) engine used an iron, closed-deck block topped with aluminum 24-valve DOHC heads, with an oversquare 89 mm bore and 80 mm stroke. A variable-length intake manifold, which Hagerty described as basically a work of art, helped it breathe across the rev range. The manifold was even symmetrical, so it could be rotated 180 degrees to make the engine easier to adapt from transverse to longitudinal mounting.

The output was the headline: 220 horsepower at 6,200 rpm and 200 lb-ft of torque at 4,800 rpm. The tachometer was marked to 7,000 rpm, with fuel cutoff at 7,300. Hagerty put the gain over the standard Vulcan V6 at 80 horsepower, which works out to roughly 74 horsepower per liter for the SHO against about 47 for the regular Taurus engine.

The rest of the package was just as unexpected. The only transmission for the first cars was a five-speed manual designed and manufactured by Mazda. A Japanese engine and a Japanese gearbox in the most American family sedan on the road was not something shoppers saw every day.

How It Stacked Up Against Its Contemporaries

In 1989, performance sedans from Europe were expensive and exotic, and American family cars were mostly soft. The SHO sat in a gap that barely existed. Car and Driver recorded a 143 mph top speed in its December 1989 issue, and period figures put 0-60 mph at roughly 6.6 seconds with the quarter mile in about 15 seconds, with some outlets reporting slightly slower numbers. Hagerty notes that a comparable BMW 535 cost about double the SHO's roughly $20,000 base price. The 1989 SHO listed at $19,739, and Ford sold 15,519 of them that first year.

The experience was the opposite of a typical American V6 of the era. Where most engines of the time delivered their best work low in the rev range and ran out of breath early, the SHO was happiest when you spun it toward redline.

The Sequel Ford Fans Argue About

The original formula was not perfect. The lack of an automatic transmission held back sales, so for 1993 Ford enlarged the V6 to 3.2 liters (92 mm bore, 3,191 cc) and offered it with an automatic. Power stayed at 220 horsepower, now at 6,000 rpm, with torque rising to 215 lb-ft at 4,000 rpm. The 3.2 used a milder cam than the 3.0, which is why many owners later swapped the 3.0's cams into it.

For 1996, Ford went further and swapped the V6 for a 3.4-liter, 32-valve Yamaha V8 rated at 235 horsepower and 230 lb-ft. That bizarre 60-degree V8, which we explored in our look at the 1996 Ford Taurus SHO, came with a counter-rotating balance shaft and a reputation for cam sprocket failures that could wreck the engine. For many fans, it is the V6 that remains the car they remember.

Why Enthusiasts Still Remember It

The SHO V6 left a cult following well out of proportion to the 1989 sticker. Owners still swap the 3.2 into earlier cars, and Wikipedia notes that modified manual-transmission SHOs have run into the low 14s in the quarter mile. The engine has even turned up in odd places, including seven mid-engine Ford Festiva conversions, one of which was owned by Jay Leno.

The bigger legacy is the idea itself. At a time when Detroit mostly offered performance in the form of a bigger V8, Ford hired a Japanese motorcycle company to build a high-revving six, and then hid it in the one car nobody would suspect. That is why people still care about the engine that made the car, and why a clean first-generation SHO still turns heads at a car meet full of louder machinery. And if you want proof the nameplate still sparks creativity, there is always that 1991 Taurus "Tamaro" mashup that surfaced on Facebook Marketplace.

Sources: Wikipedia entries for the Ford Taurus SHO, Ford SHO V6 engine, and Ford SHO V8 engine; Hagerty Media's history of the first Taurus SHO and Taurus SHO profile.