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Message
Is it possible to plumb the system without a pressure tank?
Hi
Steve,
When you say
pressure tank, I'm assuming you mean what Mazda called the AST or air separator
tank. This is a pressurized tank with a hose at the bottom, one in the
middle, and a cap with overflow at the top.
You certainly
can run without it, and I believe the 1st and 2nd gen RX-7's did just
that. Mazda added it on the 3rd gen, and from what I understand, it's a
good feature, because getting all the air out of the system is good for
cooling.
I have an inline
radiator cap with AN connectors on both ends and was wondering if I can just use
that without the pressure tank.
You could,
but it won't be ideal.
Or can a pressure tank
be located below the highest point?
Yep, it sure
can. The only problem would be filling the system, so you'd need a higher
point on the engine to do that.
How about
putting an AST as high as you can, then put your inline radiator cap in
the high point of the system at the pump outlet. That would make a
dandy fill port. The radiator cap on the AST would need to be lower
pressure than the one on the fill port. BTW, the above situation
is exactly what the 3rd gen RX-7 has :-)
Cheers,
Rusty
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