This is just more food for thought, with no scientific basis.
The F4B and many other small block Ford manifolds do not allow coolant to
flow through the back of the manifold between the heads as is done at the
front of the manifold. The earlier Edelbrock Performer, Weiand Stealth and
maybe others provided a passage at the rear of the manifold so that water
could flow between the backs of the heads.
I have been told that this improved overall water flow through the engine
and also helped to eliminate a possible air pocket in that area. On the
other hand, the extra hot water flowing through the manifold could serve to
bring more heat to the carb. Cooler engine vs. hotter carb?
Edelbrock and Weiand manifolds with the water passage are still common on
Ebay, but, since the manufacturers dropped the passage without changing the
model designations, you have to check the pictures to see if it is there.
I have no data to prove whether the extra water passage helps or hurts or
does some of both, so I would be glad to hear opinions/information from you
all.
A. C. Tynes
New Orleans
> -----Original Message-----
> From: tigers-bounces@autox.team.net
> [mailto:tigers-bounces@autox.team.net] On Behalf Of Thomas Witt
> Sent: Thursday, July 02, 2009 12:09 PM
> To: tigers@autox.team.net
> Subject: Re: [Tigers] SUNI (overheating)
>
> >>> Stewart makes a replacement high-flow water pump that
> should fit the
> >>> Tiger - I might end up installing one of these to make
> sure there is
> >>> enough water movement.<<<
>
> I remember a similar discussion on the list years ago. The
> basic premise was, "while you are moving the heat away from
> the engine faster you were also moving it faster through the
> radiator. Thus, with the high flow rate the possibility
> existed that the radiator would not dissipate the heat fast
> enough and the returning fluid would not have been
> sufficiently cooled."
>
> Is it possible to purchase a more efficient radiator (and
> high flow water
> pump) and then negate the radiator by moving the fluid
> through it too fast???
>
> While I'm sure there is a threshold to a minimum and maximum
> flow rate it seems an efficient radiator (which often equates
> to larger) becomes the deciding factor. I would assume just
> about any water pump falls somewhere between the min/max
> points. Likely though there are pumps that might be better at
> low RPM cooling than at high RPM and visa/versa.
> Additionally, if one factors in the restriction of the
> thermostat does it become the equivalent of the "NASCAR
> restrictor plate" and negate a high flow pump???
> There are so many things to factor in.
>
> It would make a great science fair experiment to test
> radiator in and out temperatures relating to flow rate. It
> seems that a minimal temperature change, - yet one that keeps
> the overall temperature near ideal (180?) would be the
> desired "sweet spot."
>
> Anyway, I'm not trying to make a statement. Rather I'm
> throwing some things out there as food for thought. With all
> the other contributing aspects of the Tiger cooling issues -
> who knows?
> Tom
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