N3v

I'm swapping a 91 N/A 13b into my miata, and obviously it'd be a good idea to upgrade the cooling at the same time. I'm going to get an aluminum radiator that fits a miata, then hook it up to the 13b. the only issue is that because of the engine bay layout, the radiator will be really far from the engine. I think the best solution is just to weld on some 16 -AN fittings on the radiator and water pump housing and run stainless lines.

However, the top coolant neck on a 13b that goes over the thermostat (the thermostat fits between the coolant neck and water pump housing, right? the engine I rebuilt didn't come with one so i'm not 100%) is made of plastic. am I going to have to fab something up, or did a different generation of rx7 come with an aluminum one that would fit?

thanks.

stevensimon

iTrader: (11)

yes thermostat is between neck and pump. s4 pump housings are all aluminum but you need to use an s4 water pump.

N3v

well I guess I need one of those then. just to clarify though, an s4 coolant neck won't fit on an s5 pump housing?

clokker

iTrader: (2)

No, it won't.
The plastic S5 thermostat housing has a three bolt mounting flange, the S4 unit has two bolts.
You could make an adaptor, not sure it's worth the effort.