Hello All:
The positive results of using a high volume water pump are interesting for it
is very different from the results that were obtained in the cooling system
tests done by TEAE/Tiger Tom. To quote "Water Pumps: Stock, High Vol
Milodon, Stewart. We did not measure a significant cooling difference with
any of the three pumps tested. However, we believe there may be an
advantage at idle with the use of a high volume pump when combined with
interactions of other cooling system enhancements." I guess it shows
that cooling problems are complicated and probably depend on the
particular car involved. I have a 260 with a 4-bbl and hipo cam and have
had great success with my car by adding the Derale fan and horn block offs
and leaving the rest stock. It seems to me that the secret to adequate
cooling with our cars is sufficient air flow as evidenced by the fact that,
for
most cars, overheating occurs at idle and not when going down the road.
If such is the case anything that will increase ambient air flow through the
radiator will have a positive effect. At idle, of course, you already have
the
slow coolant flow that some claim will improve things, so I can't imagine
that
slowing it down further will make it better, but I could be wrong. In
fact, I have
observed that increasing the idle speed while at rest seems to lower the temp.
If the car is overheating while at speed, it would seem that other factors
are
involved and other solutions would have to be employed. It may be that we
are operating our cars near some sort of "break point" and that any change
that tips the balance in the favor of better cooling produces a "cascade"
effect (i.e. the system is non-linear) so that small changes have a large
effect.
Tod
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