Hey guys,

Does anyone know what size the fitting is on the rear outlet of a VVT is?



It's the circled hole in the bottom left of the outlet that you can see in the image.

I'd be very thankful, as solving that solves a major problem in my build.

 

That's the coolant temp gauge sensor bung, there should be a block off on there. I think it's an M12x1.25.

 

If it's a coolant temp sensor, isn't it M12x1.5?

 

Correction, it's 1/8 BSP, not M12 as per http://forum.miata.net/vb/showthread.php?t=228741

 

The only problem with the above is that it looks physically too large for 1/8 BSP in the head.

Can anyone confirm?

 

Verified with a tap, it is a 1/8 BSP hole.

On an interesting note, the position is perfect for the coolant sensor if you simply drill and tap that same exact location. Bit of a tight fit, but hey, we here at MT.net are all about tight fits in holes, amirite?

 

Yes, its almost like it's a perfect spot for a coolant temp gauge sensor. Almost.

 

I have a 1/8NPT coolant temp sender in there.

 

Should be 1/8 NPT. That's where the factory gauge sender in NAs goes. I run coolant temp senders there in most of the VVT swaps I've done.

 

Ditto. Just run an NPT tap through the hole first.

C