Honda Car Forum

Ok so i know that the hx engine is vtec-e (D16Y5) or vtec econmy and the ex(D16Y8) is just vtec. But aren't they the same engine, isn't it just that the hx has extra modifications to get better gas millage. Can i make my hx engien into an EX with replacing some parts? or am i just dumb.

nothing theyre both slow and gay

The VTEC-E design represents a variation of Honda's proven variable valve timing and lift electronic control system. Most VT EC engines are configured to provide sedate driving w. good fuel economy at lower speeds, with markedly higher output & from a flatter power curve at higher rpm. Conventional VTEC designs do this by not only varying the valve timing, but by also engaging a secondary 'high lift' cam at a specific switchover point. So...the design is tuned for producing more hp from any given cylinder displacement. Honda is able to produce among the highest specific output per c.i. compared to the competition. VTEC-E however is a 'tweak' of their design. Instead of tuning the motor to optomize hp at high RPM, it increases efficiency at the lower RPMs. This is accomplished by staging one of the two intake valves (per cylinder) to only open partially, creating a swirl effect that improves mixture/combustion efficiency. This enables a leaner mixture which is how the design uses less fuel...better mpg ratings!Then during hard acceleration, the VTEC-E design uses a hydraulic actuator to engage a sliding pin that locks both the low RPM & higher lift high RPM cams together. This provides for a higher 'lift cam profile' w. longer valve duration from both of the intake valves...the engine breaths better, producing a higher output level.BTW, Honda applies a similar concept to their 'J' Series V6 SOHC motors. During lower (pre VTEC engagement) RPMs, one of the two intake valves also opens only partially. This feature helps these motors achieve a ULV-2 emissions rating. Honda's done some amazing things with their design in cars like their '07 V6 Accord...244 HP from 87 octane gas...29 mpg on highway...silky smooth & quiet...ULV-2 emmission rating.I'm almost certain you will not be able to alter a VTEC-E design to perform like a convential VTEC system...it would take exhorbitantly costly re-engineering of the design.Happy motoring!

You should stick with the EX engine. The HX comes stock 115 horse power same like the hatchback vx engine. The EX engine comes stock with 127 horsepower and the VTEC kicks harder then the HX, meaning more power at higher RPM.