November 25, 2015

d16z6 and d16y8

Posted on September 28, 2009 by in In the Garage


The d16z6 and d16y8 amount to the same gains.  Both are economical single-cam true-vtec engines.  Both are common in salvage yards, available in 1992–2000 Civic EX and Si’s, and some models of Del Sol.  Power output is roughly 130hp for each model, but a frankenstein of the two is reputed to work best.  The d16z6 has a better-flowing head and the d16y8 has a better-flowing intake manifold, so putting the two together on top of any d16 block will yield some power gains.

The most notable difference between the two is the onboard diagnostics.  The d16z6 is an obd1 engine, while the d16y8 is an obd2 engine.  Both can be converted to obd0 easily enough, or your wiring harness can be converted to obd1 (obd2 is not recommended for engine tuning other than specific applications). During the wiring harness conversion, the vtec solenoid should be wired into the ECU (automatic ECUs are particularly useful for this modification).

Availability of parts and relative ease of engine installation make both these engines excellent candidates for any CRX.

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3 Responses to “d16z6 and d16y8”

  1. Bam 5 October 2009 at 9:12 pm #

    well written and easy to understand…something everyone should learn just for simplicity

  2. Jeff 3 April 2012 at 7:53 pm #

    i was looking more into it and i think i came across that the D15b is an engine they used a little later on in the mid to late 90’s and is basically a carbon copy besides a few minute differences. i was wondering if you had come across this? I can find some D15B’s with lower mileage for super decent prices. I have found a few threads, nothing on red pepper, thought id ask what you think. im thinking thats the route i wanna take.

  3. kim 21 December 2013 at 7:09 pm #

    93 del sol d16z6 spun a bearing. A friend is selling me a 96 d16y8 for a good price. I know that the wiring harness are different. Can I use my harness from the d6 on the y8 motor and keep it odb1. The easier the better.

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