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‘Now that it’s out and working, be certain you run it,’ the 1951 Ariel’s proprietor mentioned with a wink earlier than sending me on my means, however I used to be feeling out of my ingredient driving the Ariel Sq. 4. The shifter’s on the appropriate and shifts backward, suggestions from the brakes is obscure at greatest, and the engine was puffing smoke since waking from hibernation.
‘I’ll simply device it round for a bit,’ I believed. However the character of this peculiar four-cylinder revealed itself on the open nation roads—and what a beautiful alloy lump it’s.
It could appear to be an oddity at this time, however a 2×2 four-cylinder engine was undoubtedly a novel idea when Edward Turner first sketched the concept in 1928. Working as a motorbike vendor and constructing bikes of his personal on the aspect, Turner wished to design a next-generation powerplant with larger output and long-haul touring capability. There was a stigma in opposition to four-cylinder engines, although, in that transverse fours had been thought-about too large, and longitudinal engines had been too lengthy.
Taking inspiration out of your common twin, Turner designed a four-cylinder consisting of two parallel twins in a single case, with one proper behind the opposite. And whereas it sounds a bit complicated, the concept had deserves far past the packaging, because the counterrotating cranks and 4 pistons would offset one another and run fairly easily.
And that’s engineering idea at work, because the Sq. 4 is a very easy engine, even in comparison with extra trendy bikes. Whereas it ticks incessantly and sounds rather a lot like a Farmall tractor at idle, the Sq. 4 actually comes into its personal with a bit of rpm. There’s no tach to report rev increments, however the engine provides brisk and regular acceleration via corners and as much as freeway speeds, and should have felt otherworldly to journey when it was new.
Turner discovered a house for his sq. mill at Ariel, and after transforming his prototype considerably to scale back prices, the 498 cc, OHC 4F Sq. 4 was unveiled in 1930. The engine was so compact that it slot in the usual 499 cc Ariel Sloper chassis with a Burman four-speed transmission, and supplied splendid efficiency.
The 4F mannequin would go on to win the Maudes Trophy in 1931, and a supercharged Sq. 4 achieved a blistering 110 mph at Brooklands. Capability was elevated in 1932 to 601 cc to deal with side-car responsibility, however faults with the preliminary cost-cutting design had been turning into evident.
The up to date 4G mannequin emerged in 1936 as an OHV 995 cc machine with an improved cooling fin design to alleviate extreme overheating points on the rear cylinders. In 1949, the brand new Mark I used to be debuted with alloy cylinders and cylinder head, allegedly reducing 15 kilos within the course of.
The ultimate Sq. 4 mannequin, the 997 cc Mark II, would function a very redesigned cylinder meeting and 4 separate exhaust headers, and was able to 100 mph off the showroom flooring.
Nearly any Ariel is a sizzling commodity at this time, and given the bizarre engine geometry, check driving an Ariel Sq. 4 isn’t a possibility I’d go on.
Inbuilt 1951 as an alloy Mark I, this explicit Sq. 4 was no present queen, however nonetheless a fascinating piece of outdated iron, and I couldn’t ask for a greater autumn day to journey again in time 70-some years. The Squariel fired to life with relative ease after topping off the battery, and the sound is not like any four-cylinder you’re used to.
Past simply adjusting to the controls, the Sq. 4 has attention-grabbing ergonomics that locations the large gas tank proper up in what you are promoting, and your ft again a bit to achieve the pegs. It’s additionally not a big machine, and after heaving its 440-pound heft off the middle stand, I used to be shocked at how small the bike felt on the street.
Getting on top of things, the Sq. 4 driveline is definitely one which’s designed to be ridden in a spirited vogue, and should you try to only lug it alongside, issues get a bit clumsy. The engine will lug or rev as you see match, however to get easily via the gears, it desires a bit of rpm. Shifting requires a deliberate motion of your entire proper leg, quite than simply your foot, and and not using a fast and thorough push of the shifter, you’re positive to be met with a cringe-worthy grind from the gearbox.
As I grew extra snug with the Ariel, my hesitation over the electrical-taped throttle meeting pale, and I used to be rewarded with the candy sounds of acceleration from the dual chromed exhausts. I couldn’t cease pondering how the Sq. 4 feels just like the bike equal of an outdated 911; primitive in methods, however pure and thrilling.
The beautiful Smiths speedometer climbs in steps just like the second hand on a watch, and clunking into fourth gear, the engine hums pleasantly at freeway pace. I can’t say the identical for the chassis although.
There’s nothing like a nook to maintain you in verify, and a bend on the Ariel comes with the requisite psychological verification of which course to push the slushy shifter. Regardless of some looseness within the lever, the entrance drum works roughly as meant, however the rear brake is an actual zero-to-100 form of affair. Additionally, ought to I’ve verified the date codes on these Avon tires?
The bumps are one other stable reminder of how a lot engine design exceeded chassis and suspension know-how of the day. This Mark I Ariel is match with a typical telescoping fork, a plunger rear and a sprung saddle.
Level is, no a part of the Ariel chassis strikes in concord after you hit a bump, and each ends do their very own factor on their very own time. Additionally, all however the smallest crack within the pavement bottoms out the saddle springs—not in a spine-compressing vogue—however you’re effectively conscious coil bind has occurred.
Returning to base with the Sq. 4 was more-or-less a drama-free affair, and regardless of how uncommon the bike is, I felt as if most of the people took little discover of my backroad shenanigans. Even with the idiosyncrasies and little quirks in dealing with that come from the passage of time and know-how, the 72-year-old Ariel continues to be a motorcycle that works in our trendy world.
You may meet or exceed site visitors on any street, and also you’re reminded of devoted souls who constructed, resurrected and preserved this basic Brit bike whenever you hear a squeak from the brakes, grind from the gearbox or cough from the carburetor.
And that’s a sense you received’t get from something with a catalytic converter or ABS.
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