1992 Mazda MX-3 1.8 to 2.5 V6 Swap

MAZDA 626
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ARAGORN_150
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  • 7 POSTS
1992 Mazda MX-3 GS V6 1.8-Milage=141,000...Hi, I have a question about an engine swap. I want to have changed my 1.8 V6 engine, for the JDM 2.5 V6 engine for my Mazda. I reserched that the JDM 2.5 V6 fits my car, and also is the one that fits the Ford Probe V6 and the Mazda 626. I wanted to know if I need anything else to put the engine to run, for example different motor mounts, or ECU's or something like that kind. Thanks guys
Apr 16, 2006 at 2:55 AM
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LOSONE
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You need everything that goes with the V-6. I wonder why the swap, the 4cyl is a much better engine.
Apr 16, 2006 at 3:03 AM
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COSMO
  • ✓Experienced Mechanic
  • 347 POSTS
YEs you will need to make some changes when going from the 1.8L [b:43973f386b]V6[/b:43973f386b] to the 2.5L V6. The first and obvious is the intake. You will need to change the intake from the 1.8L onto the 2.5L. Don't worry there will still be a very good power gain in the motor. Changing the intake is the first of your worries. I think you may have some exhaust manifold issues too and make sure you have the correct egr valve on before installing the engine.

cosmo...Mazda Tech
Apr 17, 2006 at 11:26 PM
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Suggested Repair

For a 1.8 V6 to 2.5 V6 swap, use the supporting V6 components. Transfer the 1.8 intake onto the 2.5, check exhaust manifold fitment, and install the correct EGR valve before the engine goes in.

Conversation Summary

The owner of a 1992 Mazda MX-3 with a 1.8 V6 asked whether a JDM 2.5 V6 swap needs different mounts, an ECU, or other parts. Experts said the related V6 components are required. One specifically advised moving the 1.8 intake to the 2.5, checking for exhaust manifold issues, and fitting the correct EGR valve.

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