Moved Into The Garage
Posted 21 December 2017 - 11:31 PM
With the bypass blanked off, as I've done in so many cars now, and no other means of flow to the T'stat when closed (other than the heater), warm coolant does still reach the T'stat to open it, most by convection, but even with the T'stat closed, the pump does a bit of stiring things up too.
Each to their own, but as I've mentioned previously, I've had no issues from blanking it completely, only good.
Great on Injection faults
Posted 27 December 2017 - 10:04 PM
Each to their own, yes.
That said, I know the cylinder head runs hotter without a bypass when the thermostat is closed. Maybe not so much of a problem in deepest Australia when the thermostat is usually open somewhat, but here in the UK in winter, it means the thermostat is closed most of the time, and the cylinder head runs hotter. The engine doesn't warm up any quicker either.
Over 50 years of manufacture of the A Series engines with a bypass of some description. I'll always put one in my builds. Others are free to do what they wish.
Great on Injection faults
Posted 27 December 2017 - 10:12 PM
you dont need to use silicone hoses although they are really good. you just need a good corrosion inhibitor in your rad [aka antifreeze]
>imho< flow around the stat with out a bypass hose wont be too much of an issue, its right by the pump.
If you mean the thermostat is close to the water pump by its physical location then yes, but you have to consider that the thermostat is between the radiator and the cylinder head, but the water pump is between the radiator and the engine block. Coolant has to first flow through the engine block and cylinder head before it ever reaches the thermostat. If you have no bypass, there is no flow. Drill some holes in the thermostat and you have a bypass, but the engine will not maintain temperature if you use it in winter. Not so much an issue in the summer or down under, or equally anywhere that's warmer than the UK 
One Carb Or Two?
Posted 28 December 2017 - 07:45 PM
I would just like to add, when using a bypass hose use silicone or a HIGH quality hose but steer clear of the Kevlar reinforced made in England stuff as I have come across many failures with this product. In one instance it was 13 months old.
If I see one fitted I usually try to put my thumb through it and I have succeeded a few times, other times I just hear a crunching noise.
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