impr323

Just picked up an 06 sedan with cracked block. It's out of the timeframe for recall so I'll be replacing the engine myself. It seems the Z1 swaps are a lot cheaper and more abundant, so I was considering this engine as an option. Would it bolt right in and run off the stock ecu? Any input would be greatly appreciated. Thanks

TomCat39

As far as motor specs, they appear to be almost identical:

R18A1
Found in:
2006–2016 Honda Civic (Thailand/Indonesia/Japanese/Pakistani-market FD1, American/Canadian-market FA1 and FG1)
2007–9 Honda FR-V (European-market BE1)

• Displacement: 1,799 cc (109.8 cu in)
• Compression: 10.5:1
• Bore & stroke: 81.0 mm × 87.3 mm (3.19 in × 3.44 in)
• Power: 141 PS (104 kW; 139 bhp) @ 6300 rpm (Japanese Spec)
• Torque: 17.7 kgf·m (174 N·m (128 ft·lbf)) @ 4,300 rpm
• Fuel Cut Off: 6900 rpm
• Redline: 6800rpm

R18Z1
R18Z1 Engine on a Honda Civic FB2
Found in:
2012–2016 Honda Civic (Southeast Asian FB2)
2016– Honda Civic (FC1)

• Displacement: 1,799 cc (109.8 cu in)
• Compression: 10.6:1
• Bore & stroke: 81.0 mm × 87.3 mm (3.19 in × 3.44 in)
• Power: 141 PS (104 kW; 139 bhp) @ 6,500 rpm
• Torque: 17.7 kgf·m (174 N·m (128 ft·lbf)) @ 4,300 rpm

What I think will be questionable is mounts and harness plugs and pinouts etc.

If you can get all that dialed, the ECU should probably run it without too much problem.

The other questions needing to be answered are, are the vtec's the same, and do the motors use the same sensors and systems?

I'm unfortunately very ignorant on these newer motors and cars. I do however remember reading about the K24 and not all of them have the same vtec mechanism with each other it seems. Very well could be the same issue with the R18 motors and I am pretty sure that would cause a bit of trouble for the stock ECU.

a_fisher_c

Why wouldn't you just put the stock motor back in? I think that regardless of price difference, the less hassle of swapping the stock engine back in will be worth it. Unless it truly it plug and play.

impr323

The stock A1 engine was prone to engine block cracks. Plus they're about 4-500 more than the Z1. If I can get away with putting in a more reliable engine for cheaper I'm all about it

TomCat39

You can reduce some of the challenges if you only use the block and head of the Z1. Keeping your intake/fuel and exhaust.

There might be a sensor challenge but less likely over the complete engine. That will likely only leave mounts being the issue.

Suprategrazx1

I am considering going down this same road myself.can anyone tell me if this swap was successful

97emsedan

All well and good, just get the ECM for that engine when you buy the engine. No worries then.

Suprategrazx1

what kind of mounts would be best for this swap?2006-2011,2012-2015 aftermarket or would I have to fabricate my own from scratch?

97emsedan

wait one please. I will look between the two and let you know what I find.

97emsedan

All imagery and OEM part numbers ( to the best that I can find online ) show me that there is virtually no difference in the mounts between the A1 and the Z1 blocks. Note that the Z1 is usually found in the RHD Civic from the Asian and Australian markets so there might be a clearance issue with the dog bone stay at the top of the engine RH side. This is where the brake booster/ master cylinder and clutch master cylinder ( for manual transmission cars ) would be located on RHD cars. I have been wrong before, but I found the USDM part numbers at Majestic Honda online and the R18Z1 parts images online using the block code as a search reference.

Denis Semenov

The engines R18A and R18Z have a different operating principle of i-vtec. You will have to replace the ECU (but not the fact that the ECU 9th is compatible with the 8th) or replace the camshaft or cylinder head completely.

97emsedan

As I had stated above, get the ECM from that specific engine ( as in the one that was in the car when the car was manufactured ). The serial numbers of both engine and ECM would be available through a dealer information access check.

Esau Kariuki

Hello!? Did you finally get the R18Z1 to work and what did you do about the crankshaft position sensor!? I accidentally bought one R18Z1 for my 06 Civic, I tried to route an extra harness to get to the back since the original had the sensor at the front of the block. Changed knock sensor, Vtec sensor, but when I tried starting it brought a P0339 code . Saying crankshaft sensor circuit A intermittent. Got tired and started looking for answer and found this forum. So did it work for anyone, please let me know thanks

Machine mike

Did anyone ever solve the cranksensor issue? I’m interested in doing this swap also😝