Bolt size and thread pitch of coolant plug?
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What is the bolt size and thread pitch of this coolant plug in the 1.6L block (see pic)?
I'm planning on using it as my coolant source for the turbo.
![Name: blockbungs.jpg
Views: 757
Size: 60.6 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/208458d1501257307-bolt-size-thread-pitch-coolant-plug-blockbungs.jpg)
Note: I have a coldside coolant reroute, and the front of the engine has no t-stat housing, just a freezeplug. The t-stat housing is now at the rear.
I was thinking about using the T-stat bypass hose/heater core hose to just route directly from the rear t-stat housing to the water inlet of the turbo (as seen in the faq pic below), but I think the turbo's coolant lines would be too restrictive and wouldn't flow enough. I do like the idea though. Somehow I think this routing wouldn't allow for enough flow to keep the water pump happy when the t-stat is closed. I suspect this pic is on an engine that doesn't have a reroute/freeze plug on the front of the block, right?
I'm planning on using it as my coolant source for the turbo.
![Name: blockbungs.jpg
Views: 757
Size: 60.6 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/208458d1501257307-bolt-size-thread-pitch-coolant-plug-blockbungs.jpg)
Note: I have a coldside coolant reroute, and the front of the engine has no t-stat housing, just a freezeplug. The t-stat housing is now at the rear.
I was thinking about using the T-stat bypass hose/heater core hose to just route directly from the rear t-stat housing to the water inlet of the turbo (as seen in the faq pic below), but I think the turbo's coolant lines would be too restrictive and wouldn't flow enough. I do like the idea though. Somehow I think this routing wouldn't allow for enough flow to keep the water pump happy when the t-stat is closed. I suspect this pic is on an engine that doesn't have a reroute/freeze plug on the front of the block, right?
![](http://www.rev2red.com/images/cars/faq/oilports.jpg)
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