Honda H-Series Engines
H-Series engines were the most powerfull line of inline 4 engines from Honda until F20C was released. H-series were produced between 1991-2002, and primary applications were the fourth and fifth-generation Honda Prelude. Besides Prelude models, H-Series were also used in some performance oriented Accord models like Accord Si-R. Honda engineers have also developed race versions of H-Series to be used in Touring Car series.
H-Series are generally compared with Honda's small displacement performance engines of the same era, the B-Series. Both were gifted with Honda's ingenious VTEC system but with its higher displacement H-Series were offering higher low end torque. Unlike B-Series, H-Series were not a high-reving engine because of its low rod/stroke ratio. Redline was usually limited around 7500rpm.
Different versions of H-Series were produced with a power range of 160-220hp. Though the power range is very wide there were only two displacements H22 (2.2L) and H23 (2.3L). Both used the same short block; displacement variation was achieved by different piston-cranckshaft combinations. All The H22's were equipped with VTEC, however H23's were all non-VTEC except one version of H23A which was used in JDM Honda Accord SiR and JDM Honda Accord Wagon AWD. Block and head of H-Series' were 100% aluminum, compression ratio was between 10.0:1 - 11.0:1 depending on the model. H-Series engines were controled by Honda Systems PGF-FI with port fuel injection and the valve gear is belt-driven with dual overhead cams. H-Series' primary design never changed but small changes were made to the engine during its life span in order to increase performance. Intake and exhaust systems were revised for improved performance,aluminum oil pan replaced the existing cast metal one. But the most important achievement was the "Fiber Reinforced Metal Cylinder Wall" (FRM). Enhanced heat dispersion and reduced weight were the benefits of FRM. FRM was later used on S2000's F20C and F22C engines.
Just like any other Honda engine H-Series is very reliable. H series has been replaced by K- Series neraly a decade ago, but still it's very popular among Honda tuners. Lots of Honda Civic's are tuned up by swapping thier engines with an H-Series engine. Their reliability and low end torque make them suitable especially for bolt-on or custom forced induction applications.
For more information on spesific engines please check out related pages.