Before liquid-cooled engines arrived to maintain precise, consistent operating temperatures, there were unique air-cooled engines. The rarest European cars that collectors go wild for were popular before water-cooled engines in the 1970s took off due to increasing global emissions regulations. Enthusiasts love to flaunt their obscure knowledge about rare air-cooled cars that command six-figure prices on the market. They serve as historical examples of pure engineering and European automotive heritage. Seriously, these cars, have tons of value; you may be surprised by how much they’re selling for.The premiums go far beyond what some collectors expect, even when the name Porsche is involved. However, these engines are historically reliable and simple, with low maintenance requirements. They're too cool not to throw stupid money at. Some models, like air-cooled Porsches, saw a value spike in 2020, and prices have remained steady and resilient due to their authentic analog driving experience. Citroën 2CV Sahara 4x4 Flickr - Martin BaertgesDespite being in production from 1960 until 1997, the Citroën 2CV Sahara 4x4 is limited to only 694 units, making it extremely rare. The car was developed as an off-roader for desert exploration in North Africa. It has two 425cc engines, one in the front and one in the rear. Each has an independent fuel tank, clutch, and transmission. The driver operates both transmissions at once with a gearstick mounted between the front seats. To dominate tough terrain, it features a reinforced suspension, wider tires, and two 15-liter fuel tanks mounted under the front seats. The rear motor can be shut off to improve fuel efficiency or serve as a backup in case one of the engines fails in remote areas.It looks like a French bug and served as a rival to Jeep and Land Rover vehicles. Pricing for this car ranged between $50,000 to over $170,000, depending on originality and restoration status. Recent sales of this car have fetched up to $167,319. But, of course, they were in pristine condition. VW Type 2 Samba Flickr - NeilFeel the love in the Deluxe Microbus or Volkswagen Type 2 Samba. It shares a 1.6-liter air-cooled flat-four Boxer engine with the Bug, with 54 hp and 80 lb-ft of torque. It was in production from 1951 until 1968, and roughly 100,000 models were built. This vintage camper is known for its massive canvas folding sunroof. Models from 1951 to 1963 have 23 windows. There are wrap-around corner glass windows in the rear and eight sky windows. It’s more valuable than the 21-window variant, which was produced from 1964 to 1967. It kept the skylights and sunroof and is still quite valuable thanks to its reliable air-cooled engine.But it takes between 20 and 30 seconds to accelerate from 0 to 60 mph with a top speed of 65 mph, so don’t expect it to get anywhere quickly. Authentic models that haven't been modified regularly sell for between $100,000 to over $200,000. Pristine 23-window models are worth over $250,000. 1965 Porsche 356 SC MecumThe 1965 Porsche 356 SC is known as the top performance variant. The 1.6-liter air-cooled flat-four engine delivers 91 hp and 107 LB-FT of torque. It was the most powerful push-rod engine Porsche had ever built at the time. Enthusiasts celebrate its racing heritage with its ability to accelerate from 0 to 60 mph in 11 seconds and a top speed of 120 mph. Only about 483 models were built, making this unique performance car incredibly rare. It’s also unique as the air-cooled engine features revised camshafts, dual Solex carburetors, and higher compression. The Porsche 356 SC features standard four-wheel disc brakes, which were optional on the 356 C.This racer is celebrated for its outstanding balance, direct steering, and nimble handling. Average models can be found at auctions for about $95,000. But incredibly clean and original examples will fetch prices over $150,000. The coupe body style is a bit more common, and the Cabriolet is often worth a lot more. 1955 Porsche 550 Spyder MecumThe 1955 Porsche 550 Spyder is a tremendous historic icon as the first car Porsche ever built for the purpose of racing. The 1.5-liter flat-four air-cooled engine delivers 120 hp and 89 LB-ft of torque. Only 90 models were built, so the Type 547 'Fuhrmann Engine’ is highly sought after. This car only weighs 1,300 lbs, can accelerate from 0 to 60 mph in 7.0 seconds, and features a top speed of 139 mph. It has a tubular ladder frame that consists of welded steel tubes covered in a lightweight aluminum body. This Porsche was designed to punch above its weight class, and it earned the title of “Giant Killer”.In the mid-1950s, it achieved incredible victories against rivals with larger engines in Nurburgring, the 24 Hours of Le Mans, and the Carrera Panamericana. It was the car that James Dean was driving during his fatal accident, immortalizing it in pop culture. Replicas are available for around $40,000 to over $70,000. But original models go for over a million dollars. 1973 Porsche 911 Carrera RS 2.7 Classic & Sports CarThe 1973 Porsche 911 Carrera RS 2.7 is a legendary icon that collectors drool over. It has a 2.7-liter flat-six air-cooled engine with 210 hp and 188 LB-FT of torque. This car can accelerate from 0 to 60 mph in 5.5 seconds with a top speed of 150 mph. It was astonishingly fast at the time, and production was limited to 1,590 units. This racer was originally designed to meet racing quotas that required 500 road-legal models for Group 4. Then it turned out to be a massive hit. Its iconic ducktail rear spoiler and lightweight design evolved into legendary racing innovations used by future generations of high-performance 911 models for decades.The Lightweight Sport M471 variant is stripped down strictly for racing, and the Touring M471 maintains its comfort amenities, such as soundproofing materials, the rear seat, and the glove box. Touring models can be found for between $600,000 to over $1,000,000, and the Sport frequently goes for over $2.4 million.Source: Hagarty, Classic, Hemmings