Price for the basic motor mount kit continues at $999.
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J-Swap Motor Mount Adapter Kit
- Thread starter Velocitized
- Start date
This is a J-series motor!
Yes, I still have kits available. $999 for the basic motor mount kit.
I am working on two 2001 NSX's right now that are both planning on using the AEM Infinity EMS with DBW and a J32A2 and FI.
I would recommend the Infinity, Haltech or similar. As far as I know, Hondata does not make an ECU for the J32A2 or J35A3.
Another J-series going in.
Bump
Stupid question but we can still use nsx clutch for this mount kit right? Buying new clutch when I do this swap and don't want to spend $2k for the nsx tranny when I don't have to.
Good question. Yes, you will still use your NSX clutch and flywheel with a J-swap and this kit.
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Will do. Thank you for pointing that out. I have posted so many pictures elsewhere, I have overlooked my own thread. Most of the parts are not easily visible once the J-series motor is installed, however I will post what I have.
Thanks again.
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For the used J-series engine I recommend a minimum refresh of the engine to include the following:
Water pump
Timing belt and idlers
Intake plenum and valve cover gaskets
A/C, alternator belt and tensioner
Install 1991 - 2001 NSX water temp gauge sending unit
Spark plugs
Oil filter
Thermostat
Clean fuel injectors
Adjust valves
Rear main seal
For the used J-series engine you need a fairly complete engine, including intake manifold with throttle body, A/C compressor, alternator, engine wiring harness and J32A2 ECU if you are planning on running the factory ECU and a J32A2 or J35A3 engine.
For the actual J-swap the major parts you will need:
J-series engine
Motor mount adapter kit
Modified J-series engine harness
Oil pressure gauge relocation kit
Custom A/C lines
Custom exhaust adapters or headers
Custom cooling hoses from the J-series engine to the NSX chassis
Misc hoses and fittings for the fuel lines
Water pump
Timing belt and idlers
Intake plenum and valve cover gaskets
A/C, alternator belt and tensioner
Install 1991 - 2001 NSX water temp gauge sending unit
Spark plugs
Oil filter
Thermostat
Clean fuel injectors
Adjust valves
Rear main seal
For the used J-series engine you need a fairly complete engine, including intake manifold with throttle body, A/C compressor, alternator, engine wiring harness and J32A2 ECU if you are planning on running the factory ECU and a J32A2 or J35A3 engine.
For the actual J-swap the major parts you will need:
J-series engine
Motor mount adapter kit
Modified J-series engine harness
Oil pressure gauge relocation kit
Custom A/C lines
Custom exhaust adapters or headers
Custom cooling hoses from the J-series engine to the NSX chassis
Misc hoses and fittings for the fuel lines
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Now for some pictures of the parts installed.
Remove the pilot bearing from the NSX flywheel.
Install the new pilot bushing in the end of the J-series crank. Apply a small amount of grease inside pilot bushing.
Clean any rust off the mating surface of the J-series crank and apply a light coat of oil.
Install the right side motor mount adapter. (Note: The engine wire harness should be reinstalled before the right side motor mount adapter is installed.)
Leave the bolts loose until the right side motor mount is installed.
Install the axle bracket. Leave bolts loose until the axle is installed and aligned.
Install the front motor mount adapter.
A relief hole will need to be drilled into the J-series block here.
Loosely install the front motor mount adapter to mark the location of the relief cut.
Drill the relief cut in the J-series block. Don't worry about drilling all the way through, this hole goes into the bell housing.
Loosely re-install the front motor mount adapter with the top and left bolts.
Install the front motor mount with all three bolts and snug, then torque down the top and left motor mount adapter bolts to hold it in place.
Now remove the front motor mount, install and torque the third motor mount adapter bolt then re-install and torque the front motor mount.
You re-use your NSX transmission bolts to bolt the NSX transmission to the J-series block however one of the NSX transmission bolts is too short.
The lower bolt on the axle side of the block is too short, so a new longer bolt is supplied with the kit.
The oil pressure gauge sending unit relocation kit is installed in-line to the J-series oil pressure light sending unit.
A clamp is included with the oil pressure gauge sending unit relocation kit to mount the sending unit on the chassis instead of the block.
Remove the pilot bearing from the NSX flywheel.
Install the new pilot bushing in the end of the J-series crank. Apply a small amount of grease inside pilot bushing.
Clean any rust off the mating surface of the J-series crank and apply a light coat of oil.
Install the right side motor mount adapter. (Note: The engine wire harness should be reinstalled before the right side motor mount adapter is installed.)
Leave the bolts loose until the right side motor mount is installed.
Install the axle bracket. Leave bolts loose until the axle is installed and aligned.
Install the front motor mount adapter.
A relief hole will need to be drilled into the J-series block here.
Loosely install the front motor mount adapter to mark the location of the relief cut.
Drill the relief cut in the J-series block. Don't worry about drilling all the way through, this hole goes into the bell housing.
Loosely re-install the front motor mount adapter with the top and left bolts.
Install the front motor mount with all three bolts and snug, then torque down the top and left motor mount adapter bolts to hold it in place.
Now remove the front motor mount, install and torque the third motor mount adapter bolt then re-install and torque the front motor mount.
You re-use your NSX transmission bolts to bolt the NSX transmission to the J-series block however one of the NSX transmission bolts is too short.
The lower bolt on the axle side of the block is too short, so a new longer bolt is supplied with the kit.
The oil pressure gauge sending unit relocation kit is installed in-line to the J-series oil pressure light sending unit.
A clamp is included with the oil pressure gauge sending unit relocation kit to mount the sending unit on the chassis instead of the block.
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For those of you looking to build your own wire harness for the J32A2 or J35A3 to 1991-94 NSX, here are the main wiring plugs that you will need.
C101, C102 plugs in engine bay under main fuse box
C158 plug by ECU
C159 plug by ECU
C160 plug by ECU
C161 plug by ECU
VSS and Neutral switch
Post CAT O2 sensor
Back up light switch, Oil Pressure sending unit
A/C clutch
C101, C102 plugs in engine bay under main fuse box
C158 plug by ECU
C159 plug by ECU
C160 plug by ECU
C161 plug by ECU
VSS and Neutral switch
Post CAT O2 sensor
Back up light switch, Oil Pressure sending unit
A/C clutch
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This is my first post ever on NSX Prime after lurking for YEARS. The NSX was the first vehicle I really fell in love with (aside from a DeLorean when I was like 6 six years old) but I've only seriously considered owning an NSX recently and the change-of-heart is largely prompted by the availability of this swap; I was always afraid of what would happen if the engine gave up the ghost years later. But it's good to know there are options now.
Now that you've been through this build a few times, have you found a good combination of engine components (heads, short blocks, ems, etc) that produces the most all-motor power with the least amount of headache? Been wondering about various EMS solutions, too. I see that you've done some builds with the AEM Infinity. Any gotchas with that solution? Highly recommended over the stock ECU? How is it on a daily driving basis?
Also, I see that I am close to you! I'm in Seattle. If I'm ever in your neck of the woods, which is semi-often, I would love to meet up and check out the build!
Now that you've been through this build a few times, have you found a good combination of engine components (heads, short blocks, ems, etc) that produces the most all-motor power with the least amount of headache? Been wondering about various EMS solutions, too. I see that you've done some builds with the AEM Infinity. Any gotchas with that solution? Highly recommended over the stock ECU? How is it on a daily driving basis?
Also, I see that I am close to you! I'm in Seattle. If I'm ever in your neck of the woods, which is semi-often, I would love to meet up and check out the build!
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Butters, thank you for your post.
I have only used the J32A2 from the 2000-03 TL-CL Type-S and the J35A3 from the 2001-02 MDX. I have not mixed and matched parts yet, although there are many options. I am preparing a J35A3 for a FI setup as the next swap into my car. With this engine I am going with J32A2 cams, high rev valve springs, mild port and polish of the heads and intake, and I will bore out the intake manifold for a 70 mm throttle body.
I have also not used any aftermarket EMS yet. For my FI build I will be using an aftermarket EMS, however I have yet to decide on which one, AEM Infinity, VEMS, Haltech or ECU Master.
If you are in the Portland area, please let me know, I would be happy to show you the swap.
David
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Another J-swap completed. This time it is a J35A3 from a 2001-02 Acura MDX.
Any pics of the build?!
Butters, yes please watch for a full build thread in the "Builds" section.
Man, you weren't kidding about the J engines being a dime a dozen. Found a handful near me that are about $400 a piece!
Yes, indeed. The ones I usually look for are the J35A3 from the 2001-2002 Acura MDX and the J32A2 from the 2001-2003 Acura TL/CL Type-S. These motors are DBC with iron cylinder liners and have individual exhaust ports in the heads.
Adapter brackets are sold out! Thank you.
New batch is on its way.
New batch is on its way.
Sorry, still waiting on the new batch of adapter brackets.
I should have complete sets of motor mount adapter brackets back in stock by the end of the week.
Motor mount kits are back in stock!
J-Swap Motor Mounts, $999
This is the basic motor mount adapter kit that will allow you to bolt a Honda/Acura J-series motor into the NSX chassis. No modifications are made to the NSX and you re-use all of the original NSX motor mounts.
What’s included in the kit:
1. Front motor mount adapter
2. Right motor mount adapter
3. Axle half-shaft adapter
4. Pilot bushing
5. Throttle bracket adapter
6. Transmission bolt
J-Swap Motor Mounts, $999
This is the basic motor mount adapter kit that will allow you to bolt a Honda/Acura J-series motor into the NSX chassis. No modifications are made to the NSX and you re-use all of the original NSX motor mounts.
What’s included in the kit:
1. Front motor mount adapter
2. Right motor mount adapter
3. Axle half-shaft adapter
4. Pilot bushing
5. Throttle bracket adapter
6. Transmission bolt
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