[TR] 4 vs 6 vane water pump impellor

[Anthony Rhodes]

Bob, I agree with the reply saying more flow should result on BETTER cooling,
all else being equal.  But not everything else is necessarily equal. I think
the biggest issue is laminar vs turbulent flow in the head and radiator. Once
flow gets turbulent them maybe this worsens or improves heat conduction.  I
can see arguments both ways. For sure, as soon as flow gets turbulent, then
resistance to flow increases.  There can be a point where added pressure does
not improve flow much even without pipes collapsing

-Tony

Sent from my iPhone

On May 28, 2014, at 7:00 PM, triumphs-request at autox.team.net wrote:

> Message: 4
> Date: Sun, 25 May 2014 21:04:25 -0400
> From: "Bob Danielson" <75TR6 at TR6.Danielsonfamily.org>
> To: <triumphs at autox.team.net>
> Subject: [TR] 4 vs 6 vane water pump impellor
> Message-ID: <A7C307D0E3BE40B18FA51EFD527EBFBE at DELLPC>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>    reply-type=original
>
> I recently had a TR6 spare water pump rebuilt by The Flying Dutchman and one
> of his options is a 6 vane impellor. I installed the pump last week and had
> the upper coolant hose (thermostat to manifold) burst yesterday. Between
> then and now, it covered over 250 highway miles with no problems. In
> examining the hose I can see where it was full of cracks and check marks so
> the failure is probably coincidence. As a result of my problem there's a
> discussion in 6-Pack on the advantage/disadvantage of a 6 vane water pump.
>
> One group feels there's less cavitation and more volume pumped through the
> system.
>
> Another group feels it pumps the water through the system too fast and the
> radiator can't cool it properly so the car runs hotter. Another view was
> that with the thermostat closed it could increase the pressure and expose
> the hose as a fail point.
>
> All speculation and theory so........ does anyone know the
> advantages/disadvantages of 4 vs 6 vane? Rimmer and Racetorations both sell
> it as an upgrade to the cooling system
>
> Thanks
>
> Bob