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Old 05-11-2014, 10:39 AM   #1
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Default Coolant Fitting on VVT Block

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.
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Coolant Fitting on VVT Block-m2_head_rear_plug1.jpg  
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Old 05-11-2014, 11:58 AM   #2
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That's the coolant temp gauge sensor bung, there should be a block off on there. I think it's an M12x1.25.
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Old 05-11-2014, 12:00 PM   #3
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If it's a coolant temp sensor, isn't it M12x1.5?
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Old 05-11-2014, 12:01 PM   #4
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Correction, it's 1/8 BSP, not M12 as per http://forum.miata.net/vb/showthread.php?t=228741
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Old 05-11-2014, 12:14 PM   #5
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The only problem with the above is that it looks physically too large for 1/8 BSP in the head.

Can anyone confirm?
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Old 05-11-2014, 03:44 PM   #6
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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?
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Old 05-11-2014, 04:28 PM   #7
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Yes, its almost like it's a perfect spot for a coolant temp gauge sensor. Almost.
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Old 05-12-2014, 10:43 AM   #8
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I have a 1/8NPT coolant temp sender in there.
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Old 05-12-2014, 11:47 AM   #9
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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.
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Old 05-12-2014, 02:25 PM   #10
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Quote:
Originally Posted by Leafy View Post
I have a 1/8NPT coolant temp sender in there.
Ditto. Just run an NPT tap through the hole first.

C
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