Re:[alfa] bypass restrictor installation, 4C2000

["Dean W. Cains" <dwc@xxxxxx>]

Hi Chris:

Here's your answer:

http://www.geocities.com/motorcity/downs/3837/bypassco.html

The spring-loaded side of the bypass restrictor faces the thermostat, so 
the fixed-orifice end faces the water pump (the force of the spring opposes 
water flow).  Note also the necessity of the proper, dual-plane (or 
reverse-poppet) thermostat.  Centerline sold me a correct one a few years 
ago, but you can substitute a Stant #13378 or NAPA #THM138 (neither of 
those will come with the proper gasket, though).  When the thermostat is 
open, the bypass is blocked from any coolant flow, so the bypass 
restrictor, or lack thereof, becomes moot.  I'm not sure why all the 
discussion about it, as it really only affects water flow during engine 
warm-up.  The proper thermostat, and in some cases, coolant mixture are 
what matter.

Regards,

Dean
Lutz, FL
'74 & '87 Spider Veloce's

At 09:37 PM 11/22/2003, you wrote:


> Date: Sat, 22 Nov 2003 15:11:16 -0500
> From: "Christopher Keen" <ckeen74@domain.elided>
> Subject: [alfa] bypass restrictor installation, 4C2000
>
> Hi all,
>
> I just installed a bypass restrictor I got from my mechanic, and wanted to
> make sure I have it installed right. I put it in as it was installed on the
> '78 spider parts car I got it from: on the end of the bypass hose nearest
> the water pump, and with the small opening facing the water pump. Can
> someone confirm that this is correct?
> Thanks
> Chris Keen
> '77 spider
> Los Altos, CA
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