thermostat housing/water pump thread size?

[c.h.i.e.f]

hey guys just a wondering about the isuzu thermostat housing/water pump:

1.does anyone know what thread the heater hole in the thermo housing is?

2.also assuming the thread size of the water pump hole will be the same?

3.which one is the pressure side? (ill say water pump hole)

why i ask is because i am going to use them as turbo cooling lines and i bought 2 fittings worth $50 and they ended up being the incorrect size

regards
mathew

[c.h.i.e.f]

All I keep coming up with for thread size is 3/8 BSP surely this is not correct ? Wish I knew where the barb fittings went that came out of it

[Dougal]

No idea, but you can skip turbo water cooling if you want. It's there for petrol engines, it's optional for diesels.

I have the water jacket plugged on my turbo, one side sealed, the other side intentionally not fully sealed so it can't build up pressure inside.

[c.h.i.e.f]

No idea, but you can skip turbo water cooling if you want. It's there for petrol engines, it's optional for diesels.

I have the water jacket plugged on my turbo, one side sealed, the other side intentionally not fully sealed so it can't build up pressure inside.

Yeah I was considering to plug them up but I thought I may as well utilize it to its potential but then encountered this problem so I'm assuming the temps on a petrol engine are higher and the temperature creeps across the centre to the compressor so the water cooling removes the high temps before reaching the cold side ?

[Dougal]

Water cooling is about protecting the bearings on hot shut-down.
Petrol engines both run hotter exhaust and less exhaust. An idling petrol takes a long time to cool down the exhaust because the exhaust volume drops right down, there's no decent flow to cool it.

On a diesel our exhaust doesn't get as hot to start with, but at idle you've got the engine pushing a large amount of quite cold exhaust gas through the turbo for fast cooling.

[c.h.i.e.f]

Oh