D15b Vtec Manual
Pdffree which is more powerful the d15b vtec and zc vetec engine download book which is more powerful the d15b vtec and zc vetec enginepdf free download which is. The vtec d15b engine more powerful 16l brothers when the dohc zc was the top engine the d15b came in both single and double carbed sohc versions.
Ok i can hardly find out any info on a d15b vtec e what is hpsame has much more lift than a a6 when i hit vtec i can feel it this zc vtec fake js. D series engine technology culminated with production of the d15b 3 stage vtec a honda d engine in with more aggressive cam timing the sohc vtec zc is. Between plain dohc and dohc vtec the b16a engine is not derived from zc vtec d15b engine is used on the current ek vtec appears in more guises.
D15B 3 Stage VTEC Before you can understand what is meant by '3 Stage VTEC', you have to be clear about what VTEC is. VTEC is simply a cam profile switching mechanism. Two cams are combined into one: a street friendly cam that idles well, makes good power in the low and mid RPM band, has low emissions; and another optimized purely for high RPM power. On the D-series engine this is applied to the intake valves only. In 1992 Honda came up with a fuel-economy application for their cam switching strategy called VTEC-E.
D15b Vtec Swap
This time they used VTEC to switch between 12 valve and 16 valve operation. Closing one valve increases the speed of air flow into the engine at low RPM to keep the engine running smoothly and also creates a swirl effect in the combustion chamber that spreads the fuel evenly allowing for a very lean air-fuel ratio avoiding abnormal combustion. By the time the sixth generation Honda Civic was released, Honda had decided that they could combine both VTEC-E and VTEC into one SOHC D-series engine.
Stage one would be 12 valve operation of VTEC-E, Stage two being normal 16 valve operation, and Stage three being the VTEC performance cam profile. This resulted in excellent fuel economy from a high performance, small displacement SOHC engine. Unfortunately, market considerations as well as emissions regulations prevented this motor from reaching the United States. D15Z7 In Japan the engine block is stamped 'D15B'; rather cryptically, considering that there are OBD0 non VTEC engines and OBD1-OBD2 SOHC VTEC engines also stamped 'D15B'. There are also the most commonly known USDM D15B# engines that came stock in all 92-95's except the Si/EX and Del Sol VTEC.
D15b 3 Stage Vtec Specs
When you go on an internet forum or call an engine importer asking about a D15B, people are going to assume that you're talking about one of these other motors because the '3 Stage VTEC' motor just isn't commonly known. People will swear to you that it doesn't exist.
D15b 3 Stage Vtec Manual
Outside of Japan the engine block is stamped D15Z7. This is the most convenient way to refer to this engine, even though you may have the JDM version stamped 'D15B'. '3 Stage VTEC' is a very cumbersome term and causes all kinds of confusion, especially among people who have no interest in the D-series engines. The 'D15B' I am referring to comes from the OBD2 (1996-1999), EK3, Civic VTi / Civic Ferio Vi. With the exception of the dual VTEC solenoids, it's very similar to the D16Y5, or the D16Y8 but with EGR. This motor alters both the intake valve size (by keeping one valve mostly closed under certain conditions) and intake valve lift, duration, and timing.
The engine produces 128.2 hp @ 7000 RPM and 102.7 ft/lbs @ 5300 RPM. It has a redline of 7300 RPM. Compression ratio is 9.6:1.
Recommended Octane is 91 RON or 87 CLC (USA). Engine size is 1493cc. '3 Stage', or 'Dual VTEC'? The motor has two VTEC solenoids giving you three stages of operation.
As with the other Civic SOHC engines from this time period, VTEC and VTEC-E only act on the intake valves. Stage 1: 12 Valve mode: The secondary cam lobe is practically round, opening the intake valve just enough to to let fuel through. At lower RPM's, the engine's air demands are small. By decreasing the size of the path that the air takes to get into the combustion chamber you increase its speed. This packs more air into the combustion chamber than a 16 valve design up until about 2500 - 4000 RPM (depending on throttle position). Also, since the air is entering the combustion chamber at the corner through only one intake valve, it swirls around the combustion chamber which helps vaporize the fuel and mix it evenly.
Stage 2: 16 Valve mode: the VTEC-E solenoid is powered up locking the intake valves to the primary cam lobe. The engine's demand for air is higher so a larger, less restrictive air passage is required to maximize volumetric efficiency. Stage 3: VTEC: The intake valves that were previously locked to the primary lobe are now locked to the mid lobe which opens earlier, stays open longer, opens higher, and has more overlap with the exhaust valve. This increases air flow in the high load/RPMs broadening the power band even further. Swap into 1992 Civic VX What To Keep (D15Z1) Here are some things to scavenge from your VX motor before you sell it on fuelly.com. Some of these should immediately be transferred onto your new motor, and some other things should be kept as spare parts.