Ford Sierra RS Cosworth Buying Guide
Fast Fords were nothing new when the Cosworth arrived in 1985, but this mighty model was the start of something really big...
How much to pay
• Project £3500-10,000 • Good £15,000-33,500 • Concours £35,000-80,000 •
Running costs ★★★★
DIY friendly ★★★
When the 204bhp Sierra RS Cosworth was unleashed in 1985, fast Ford fans went into a frenzy. It was easy to see why, because here was a car that was fast, practical and affordable; you could take it on a track day at the weekend, then take the kids to school in it on Monday morning.
What we didn’t know back then was that these cars would be a better investment than gold bullion. If one of the key selling points of the Cossie in period was its affordability, that’s gone out of the window now, as prices go skywards.
The Cosworth-tuned Sierra came about because Ford had to build 5000 road-going examples if it wanted to homologate its Touring Car in Group A racing. Having produced those, the Blue Oval then turned up the wick even further, with the 224bhp RS500 of 1987. Hand-made by Tickford, these are now the holy grail for Cossie fans. Later would come a more discreet (but no less capable) saloon that came in rear- or four-wheel-drive forms.
All are desirable, but some are more affordable than others – and there’s plenty to be aware of before you go shopping...
Your AutoClasssics Ford Sierra RS Cosworth inspection checklist
In standard form the Cosworth’s engine is remarkably unstressed; as long as it hasn’t been taken to beyond 330bhp it should continue to be reliable if the work has been done properly. Thanks to a strengthened block, the RS500 is safe up to 430bhp.
Head gaskets corrode, so they can fail; see if the engine runs hot. White emulsion doesn’t form on the underside of the oil-filler cap; instead, the cooling system gets pressurised. If there’s lots of bubbling in the coolant with the engine running once you’ve removed the header-tank cap, there’s trouble ahead. The gasket is most likely to blow at the back of the block; it’s best to replace it with a Group A item instead.
If there is a white emulsion on the underside of the oil-filler cap, there’s a crack in the block or head. Repairs aren’t possible, which means finding a serviceable second-hand unit – and that’ll cost plenty, especially if it’s an RS500 item.
Check for blue exhaust smoke, which denotes that either a bottom-end rebuild is due or the turbo needs a rebuild. Piston slap when cold isn’t a big deal, as long as it disappears once the engine has warmed up; it’s because the gudgeon pins are poorly designed. The phase sensor in the distributor also breaks down, leading to misfiring, but it’s a cheap and easy fix.
1965 Ford Cobra Kit
Stk 2336 1965 Shelby Cobra Kit We do not have much documentation on this 1965 Shelby Cobra Replicar. The fiberglass body has been professionally painted Burgundy and is in good condition. The interior is black vinyl with a complete set of Stewart Warner gauges. A manual convertible top is included. Under the hood is a small-block Ford that appears to be a 289ci. It is equipped with a Cobra dress-uFor Sale | 16 Jun 2018 | 325 Mcgill Ave Nw Ste. 500 Concord Nc 28027$ 34,995
1931 Ford Roadster Replica
STK 2430 1931 Ford Roadster Replica This is an well engineered 1931 Ford Roadster Replica that has been detailed to perfection. The heart of the machine is a refined chassis and sophisticated suspension that safely handles the powerful drivetrain. Horsepower is furnished by a 400ci GM small block that was totally rebuilt in 2012. It is equipped with a mild cam, an aluminum intake and six 2-barrelFor Sale | 16 Jun 2018 | 325 Mcgill Ave Nw Ste. 500 Concord Nc 28027$ 35,995
Ford Ranger 2.2 TDCi XL Double Cab Pickup 4x4 4dr
White, Rear Truckman Top, Tow Bar, Rear Bumper Bar, 1 Owner From New, Full Service History, 1 owner, £11,989 This car comes with Bluetooth, DAB Radio, Electrically-Operated Front Windows with One-Shot Drivers Window, Radio with MP3 Capability and AUX Audio Input, Thatcham Cat 1 AlarmFor Sale | 16 Jun 2018 | Damside, Keighley, West Yorkshire, BD21 1QD£ 11,989
Ford Ranger 3.2 TDCi Limited 1 Double Cab Pickup 4x4...
Grey, Air Bags, Power Steering, Electric Windows, Electric Mirrors, Remote Central Locking, Dual Zone Digital Climate Control, Air Conditioning, Wide Colour Screen SAT/NAV, REVERSE CAMERA, Full Black Leather Interior, Electric Seats, Heated Seats, Cruise Control, Multi Function Steering Wheel, Roof Rails, Side Steps, Rear Privacy Glass, Sports Automatic Tiptronic Gearbox, Blue Tooth, Rear Snug TopFor Sale | 16 Jun 2018 | Damside, Keighley, West Yorkshire, BD21 1QD£ 15,989
Ford Victoria 1951
1951 Ford Victoria condition: excellent cylinders: 8 cylinders drive: rwd fuel: gas odometer: 51002 paint color: yellow size: full-size title status: clean transmission: manual type: coupe 1951 Ford Victoria Flathead V8 (239), 3 speed manual with overdrive, original AM radio (works), new whitewall tires, and nice interior/body. Runs and drives excellent. All stock with NO mFor Sale | 15 Jun 2018 | Fort Wayne, IN, USA$ 25,900
2007 FORD MUSTANG SHELBY GT500
Here we have the 4616th of 6513 Shelbys made in 2007. This is a beautiful example of a Shelby GT500 with low miles and powered by the supercharged 5.4L this car is over 500 HP. It`s had a Ford Racing cold air intake added & X-pipe exhaust system. This Mustang has the stealth look to it with the dark leather interior and black paint. If you watch and listen to the video we think you`ll agree that tFor Sale | 15 Jun 2018 | 1000 S Victory Dr Mankato, MN 56001$ 34,900
Ford Mustang 1970
Very nice car! Inspected and runs good! Really nice example of a 48 year old car, not a show winner but nice! Wimbledon White with Weld wheels. I believe the engine is a 86-89 302 H.O. Roller engine. This means it's a High Output, with a roller cam, & Roller lifters. It also has some kind of special drag type transmission. Tried to get a picture of it, it's black. New exhaust sounds great! NFor Sale | 14 Jun 2018 | Orange, CA, USA$ 8,900
Ford LTD 1972
1972 Ford Ltd condition: good cylinders: 8 cylinders drive: rwd fuel: gas paint color: red size: full-size title status: clean transmission: automatic type: coupe Good condition Good engine Good transmission Comvertible 2 doors If interested contact us ASAPFor Sale | 14 Jun 2018 | Lake Oswego, OR, USA$ 9,000
All of these cars came with a five-speed manual gearbox that’s very strong, but eventually the synchromesh on second ratio fails, leading to crunchy changes. Even when new the shift was notchy, but if it’s really baulky from third to fourth, the synchro rings are on their way out.
By the time the gearbox required an overhaul, the differential will probably need one, too. Again, they’re also very strong, but if the car has been caned the axle will be the worse for wear, although everything is available to effect a rebuild.
Unless the clutch has been asked to transmit more than 330bhp it’ll rack up tens of thousands of miles quite happily. Replacements aren’t costly. More of a problem is a tired propshaft centre bearing, as these aren’t available new. That means trying to find a decent used propshaft, and they’re scarce.
Suspension and brakes
A universal joint connects the steering column to the rack. It contains a rubber bush that gets cooked, leading to play in the steering. Replacements aren’t available, and it’s an MoT failure point.
Vague steering could also be down to tired bushes in the track-control arms in the front suspension; you can also expect vibration when braking. Polyurethane replacements are your best bet to get it all back under control.
The suspension is vice free, but what’s fitted may well be tired or, if it’s already been replaced (which is highly likely), mismatched parts may have been fitted. This is common; a fresh set of springs and dampers will probably transform any car that’s less than mint.
If aftermarket wheels are fitted, make sure there’s enough clearance and check for uneven tyre wear. The brakes are reliable but will suffer from juddering if they’ve been cooked, yet everything is available to make the car as good as new. More of a problem is a leaking brake-pressure apportioning valve; it’s located just ahead of the nearside rear wheel on a RHD car. Replacements aren’t available, and leaks mean an MoT failure.
Localised rust might be evident, but anything serious suggests poor crash repairs. Home in on the boot floor and double-skinned chassis rails, as well as the sills, front inner wings and suspension turrets. Also analyse the area where the front wings and slam panel intersect, the tailgate edges underneath the rubber trim, and the panel behind the washer bottle in the engine bay.
While corrosion can be a problem, crash damage is more of an issue – which is why you must scrutinise the car’s structure and panel fit very closely. Any sign of rippling in the boot floor or front inner wings is bad news – the same goes if there’s a lot of missing seam sealer.
There’s a VIN plate riveted to the slam panel, while the chassis number is also stamped into the floorpan, underneath a flap in the carpet between the driver’s seat and sill. The chassis and engine numbers should match on a Cosworth, but not on RS500s. These got a replacement engine in the Tickford factory, yet the registration document wasn’t updated to reflect this. If buying one of these later Cosworths, ensure the car has its original engine; a replacement will reduce an RS500’s value significantly.
If any interior trim is missing or damaged, haggle very hard. New trim has been obsolete for years, and used parts are either unavailable or seriously costly. The seats, trim panels and parcel shelf could all be damaged through wear or speakers having been fitted, but it’s the dash that causes the biggest headaches. These split from exposure to sunlight, so check for cracks around the central speaker.
The electrical system tends to be reliable, but if the loom has been messed with there might be some erratic behaviour, especially if an aftermarket security system has been spliced in. Faulty sensors can lead to warnings flashing up on the dash, but problems are usually fixable – the ABS warning light is the one most likely to be illuminated. The cooling fans can cause problems, too, as they can draw up to 30 amps but only a 20-amp fuse was fitted.
- 1983: Ford gives the green light to a Sierra Group A race programme, and Ford’s Special Vehicle Engineering division is commissioned to produce a Sierra homologation special.
- 1984: The first Cosworth Sierra prototypes are running.
- 1985: The Sierra RS Cosworth debuts at the Geneva show, and the first press drives take place soon after.
- 1986: The Sierra RS Cosworth goes on sale in the UK.
- 1987: The RS500 goes on sale and the Sierra Sapphire RS Cosworth goes into production; 11,000 are made.
- 1990: The Sierra Sapphire RS Cosworth 4x4 goes on sale; 9250 are produced.
A new generation of classics is becoming very fashionable. Sporting cars from the 1980s are now incredibly collectible, but because so many of them were modified in period, securing something that’s original means parting with big bucks.
While average examples of the Sierra RS Cosworth are still relatively attainable, anything that’s in superb condition will be expensive – and if it’s an RS500 you’re looking at serious cash changing hands as these are by far the most collectible and rarest edition.
Before buying, make sure that it’s the real deal. Fakes have been known to be passed off as the genuine item; all authentic cars have a factory-fitted tilt/slide sunroof. If the engine isn’t standard, establish who has done the work and make sure the car has been serviced frequently, with top-quality materials used including fully synthetic oil.
If your pockets aren’t that deep, don’t dismiss the idea of a four-door Cossie. While these will never have the investment value, you get most of the usability and all of the performance in a more affordable package. Cheapest of the lot are the four-wheel-drive models.
Whatever you buy, try to use it rather than just park it up. These are incredible driver’s cars, and too many of them are now treated purely as commodities. That’s completely understandable, but it’s still a tragedy.
|Sierra RS Cosworth|
|Sierra RS Cosworth RS500|
|Sierra Sapphire RS Cosworth|
|Sierra Sapphire RS Cosworth 4x4|
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Classic Cars for Sale
Stk 2336 1965 Shelby Cobra Kit We do not have much documentation on this 1965 Shelby Cobra Replicar. The fiberglass body has been professionally painted Burgundy and is in good condition. The interior is black vinyl with a complete set of Stewart Warner gauges. A manual convertible top is included. Under the hood is a small-block Ford that appears to be a 289ci. It is equipped with a Cobra dress-u
STK 2430 1931 Ford Roadster Replica This is an well engineered 1931 Ford Roadster Replica that has been detailed to perfection. The heart of the machine is a refined chassis and sophisticated suspension that safely handles the powerful drivetrain. Horsepower is furnished by a 400ci GM small block that was totally rebuilt in 2012. It is equipped with a mild cam, an aluminum intake and six 2-barrel
White, Rear Truckman Top, Tow Bar, Rear Bumper Bar, 1 Owner From New, Full Service History, 1 owner, £11,989 This car comes with Bluetooth, DAB Radio, Electrically-Operated Front Windows with One-Shot Drivers Window, Radio with MP3 Capability and AUX Audio Input, Thatcham Cat 1 Alarm