2003 GUIII - TD27T
what's the questions about pressure about?Interested in how you tested this.
We've found the opposite through testing (with a modified pump) that the vacuum created from an undersized bypass is relieved when the thermostat opens.
In regards to thermostat operation, the one thing I don't want is the thermostat to be a FULL open. As you state the thermostat has lost control and only reducing load will reduce temps
when the bypass is fully open /thermostat fully closed,
this is not a normal operating area.
as soon as the temp gauge starts to move that's is indicative
that the thermostat has done it's 1st task,
remained closed so the engine can heat up faster,
it's now onto the 2nd part of it's job.
i don't think a cold engine gives a hoot about high vacuum on the suction side or high pressure on the output side.
and these conditions are null and void once the thermostat starts to operate.
You are doing thorough testing, but to what benefit?
I mean, when the thermostat is just opening
is never going to be a situation under normal operating conditions
where the potential/likeihood of the cooling system not being able to cope is going to happen.
I'd be more interested in what's going on when the thermostat is fully open and bypass fully closed.
because that's when temps run away uncontrollably.
and how is that the opposite? or even relevant,
TD's aren't in any danger of overheating when the thermostat is just opening.
I find it interesting when you keep saying "undersized" bypass.
when earlier in this thread "GQShayne" and I were discussing coolant flow
and the role the bypass plays
and that the bypass could possibly flow a lot more than it's gets credit for,
you suggested he has a rethink, what's changed between now and then?