About The F Series Engines
Serial production of the F20 family engines began in 1989, initially for the Accord and Ascot models. In these powertrains, engineers at Honda Motor Co., Ltd. decided to use an open aluminum BC with a height of 219.5 mm. All 16 valves on the F20A / B / B6 / C range are driven by either one (SOHC) or two (DOHC) camshafts.
The primary advantages of the F20 series power units are, perhaps, a good torque indicator and excellent acceleration dynamics for a two-shaft motor. As for single-shaft engines, we can say that they had the only plus and were great for large and "heavy" cars at one time.
Power plants F20A / B / B6 / C are part of a large family of "F-motors" and have analogs among F18, F22, and F23, only with different nominal volumes. Another related series of engines from the "H" family (H22 and H23), produced in parallel with the representatives of the F20 line, is also very close to them from a technical point of view.
Almost all F20 engines were discontinued in 2001 when the K20A replaced them. Modification F20 - F20C, delayed on the assembly line of the Honda company until 2009.
Since the power plants of the entire series are structurally similar but differ in the degree of force, maximum power, and some other characteristics, we will consider them separately.
Honda F22 engine reliability, problems, and repair
At the beginning of 1991, Honda launched a 2.2 liter representative of the F series called the F22. This Engine was developed from the F20 and used its 219.5mm high aluminum cylinder block. The diameter of the cylinders remained unchanged, and the crankshaft was replaced with a longer stroke, with a piston stroke of 95 mm; engineers replaced the connecting rods with short ones - 141.5 mm. The diameter of the pistons is 85 mm; their compression height is 30.5 mm. This set allowed the working volume to be increased to 2.2 liters.
The block F22 is covered with a SO HC single-shaft head but with four valves per cylinder. These cylinder heads do not have a VTEC system, with rare exceptions. The diameter of the intake valves is 34 mm, the diameter of the exhaust valves is 29 mm. The F22 uses a belt; a timing belt needs to be replaced every 90,000 km. When it breaks, the F22B motor bends the valve.
Do not forget about valve adjustment; it is required after every 40-50 thousand km. Valve clearances (engine cold) F22B / F22A: intake 0.23-0.28 mm, exhaust 0.28-0.33 mm. Clearances for F22B DOHC: inlet 0.07-0.11mm, outlet 0.15-0.19mm.
Along with the usual F22A and F22B, a sports engine was produced, with little in common with the F-series - the F22C1. Engineers developed this Engine based on the even more evilly aspirated F20C.
The F22C1 was installed in the Honda S2000 for the North American market. Unlike the 2-liter Engine, it uses a longer-stroke 90.7 mm crankshaft, 149.65 mm connecting rods, and 29 mm pistons, but slightly different from the F20C, the compression ratio is reduced to 11.1. The height of the cylinder block is 224 mm.
This allowed the working volume to be increased to 2.2 liters.
The F22C head is similar to the F20C, but new camshafts with a phase of 296/296 and a lift of 12.37 / 12.06 mm were used. The F22C also has a heavier flywheel weighing 9.5 kg. Otherwise, these motors are the same.
The F22 Engine belongs to the F family and has related models with different displacements: F18, F20, and F23. Together with the F engines, Honda produced a very close technically sports H series, including the H22 and H23.
Engineers produced the Honda F22 engine until 2000 when the K20A replaced it. The S2000 F22C1 motor was built in 2009.
Honda F22 engine modifications
1. F22A1 - engine for Accord and Prelude, compression ratio 8.8. Power 125 HP at 5200 rpm for the Accord and ten hp. More for the American Prelude, which is achieved by adjusting the control unit.
2. F22A3 / F22A7 - version for the European market, compression ratio 9.8, camshafts from F22A6, exhaust from F22A4, power 150 hp. At 5900 rpm.
3. F22A4 - analog of F22A1 with different exhaust, power 130 hp. At 5200 rpm.
4. F22A6 - similar to F22A1, but with a different intake, exhaust, camshaft, and the corresponding setting of the control unit. Power increased to 140 hp, at 5600 rpm.
5. F22A9 - analog of F22A6 for Australia.
6. F22B - analog of F22A and H23A, but with a two-shaft cylinder head and a compression ratio of 9.3. These DOHC motors develop 160 hp. At 6000 rpm.
7. F22B1 - similar to F22A, but the heads of these engines are equipped with a VTEC system tuned for fuel economy.
8. F22C1 - the full version of the F22 motor, described at the beginning of the article.
Honda F22B / F22C engine problems and malfunctions
F series motors are similar to H motors, so their issues recur. You can find out about them here.
The problems of the F22C Engine from the S2000 are also written there, it is slightly different from the F20C and has no issues with the cymbals, but otherwise, they are very close.
Honda F22B / F22C engine tuning
You can increase the power of the F22A by installing a cold intake, an intake manifold from the H23A, a 68 mm throttle body, a 4-2-1 manifold, and a 63 mm exhaust pipe. This will provide ~ 15 hp.
To get 200+ hp. on the flywheel, you need a cylinder head porting with bronze guides, stiff springs, tuning valves, and plates. It would be best if you also had a Bisimoto level 2 camshaft, a split gear, pistons for a compression ratio of 11, light connecting rods, a light flywheel, H22A injectors.
You may be interested in the F22C Engine