Paul,
As a follow up to my last email, these are the sensors I am looking

for. You

have added a couple that I had not contemplated. What type/who makes an
appropriate water flow sensor?

That is a very good question. I would love to have something we could
place in a stock radiator hose with a couple of hose clamps.

Drawing from the industrial stuff I've worked with you have the choice of:
1) Mechanical (pressure drop and leak potential as well as parts falling
off going through your water pump).

2) Thermal dispersion/mass flow (too complicated for our budgets)

3) Differential pressure switch and a crude venturi:  This might fit the
bill depending on the cost and robust-ness of the switch.  Would give you
an adjustable or selectable flow velocity (differential pressure).  Piece
of SS tubing to form a venturi and couple of taps for the switch.  Two hose
clamps and a hot wire & switched wire for the signal.  Would have to be a
very small DP rated switch, on the order of 5 IN H2O.  Much more and you
will be back to too much pressure drop at high rpm.

Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR
13B in gestation mode

If we calibrated the block pressure drop we would know the water flow.
Anbody got a fire hose?

Paul Lamar
 
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