Myles:
Thanks. But, I have a Longman head that doesn't allow for the larger
pulley. Even with the standard pulley, I had to do a lot of grinding on the
bottom of the thermostat housing.
My question has to do more with the impeller, than the pump body. The cast
iron impellers (either shallow or deep) in the aluminum bodies, appear to
have far better flow characteristics than does this new pump with the
stamped metal impeller. But, do they?
Norm
-----Original Message-----
From: Myles Winbigler [mailto:mwinbigler@worldnet.att.net]
Sent: Tuesday, September 16, 2008 9:54 PM
To: twobees@sprynet.com
Subject: Re: [Vintage-race] 948 Water Pump Questions
I've used the aluminum water pumps in 948s for some time and have had no
problems using either the standard 948 pump pulley or an oversize pulley
which comes from some other A series motor. This usage has been on a Lotus 7
America and on a Sadler Formula Junior, both with A series motors and both
with radiator cores larger than the standard Bugeye radiator. I don't know
the source of the that larger pulley, but it does slow the water pump down.
The only problem when fitting it can come if the head has been milled quite
a bit. The large pulley may rub or stall on the casting below the
thermostat galley; I've been able to relieve the casting with a little
grinding and it's worked out just fine (However, I'm only running about
11:0 - 1, not modern grenade compressions).
Myles Winbigler
59 Bugeye
60 Lotus Seven America
59 Sadler F Jr (all with 948s)
----- Original Message -----
From: "Norm 2Bs" <twobees@sprynet.com>
To: "Vintage Racing Digest" <vintage-race@autox.team.net>; "SpridgetsDigest"
<spridgets@autox.team.net>
Sent: Tuesday, September 16, 2008 4:32 PM
Subject: [Vintage-race] 948 Water Pump Questions
>I just bought a new water pump for the modified 948 Spridget engine in
>my Turner racecar. It's an alloy body with stamped metal impeller by
>GMB, Japan.
>
> The angle of the blades on the impeller are very nearly at right
> angles to the shaft, whereas the blades on the cast iron impellers of
> the old pumps I have are at nearly a 45-degree angle. I find it hard
> to believe that this new pump will do anything but cavitate at
> race-speeds (3,000 to 6,000 rpms).
>
> Have any of you with race or street Spridgets had any experience with
> this brand pump? Is it good or bad? I ask because I need to grind
> away clearance at the top for the thermostat housing section of the
> head. Can't return it after modified. Has anyone modified the
> impeller in any way (blade angle, spot-weld, etc.)?
>
> Thanks in advance for your help.
>
> Norm Sippel
> '59 Turner Mk.1
> Florida, USA
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