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This is a general interest thread for builders using a Miata 1.8 L.

I am planning on using braided steel hose coolant and heater lines and am going to have a custom coolant reroute spacer, thermostat cover and water pump inlet housing CNC machined that will include SAE ORB ports to accept AN hose fittings. To distribute the set-up costs a bit, I am curious to know if there is any interest for these parts so that I can have them made at small quantity prices instead of at one-off prices.

The first part is the coolant reroute spacer. It includes ports for an OEM temperature sensor, an aftermarket temperature senor with 1/8"-27 NPT threads (specifically VDO part number 323-095) and a -10 ORB heater line fitting.

The second part is the thermostat cover. It includes a 3/4"-14 NPT port designed to accept a 3-1/2" long -16 AN adapter (CSR Performance Products part number 909AN16) for the coolant return line. The thermostat cover is designed to orient the port to the cold side of the engine.

The third part is the water pump inlet housing. It includes ports for a -16 ORB coolant feed line fitting, a -10 ORB heater line fitting and two -4 ORB coolant return line fittings (one for the line coming from the throttle body and one for a turbo which can easily be plugged). The -16 ORB port faces the driver side, the -10 ORB port faces rearward and the -4 ORB port faces forward.

My pass-though costs based on an initial order for 5 sets is:

- Thermostat Spacer: $75
- Thermostat Cover: $80
- Water Pump Inlet Housing: $80

Renderings of the parts are provided below. Lead time is 5-6 weeks. Anyone interested please feel free to PM me.

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Steve

I know this posting is from dec but are these parts avaliable Thanks Rick