As Sandy mentioned, plugging the bypass is pretty standard in the racing
world. We do it. We also remove the thermostat and replace it with a Moroso
plate with the 5/8" hole opened to 11/16".
It's never had a cooling problem.
Buck Trippel
----- Original Message -----
From: "Sandy Ganz" <sganz@pacbell.net>
To: "Smit, Theo" <Theo.Smit@dynastream.com>; <tigers@autox.team.net>
Sent: Monday, September 28, 2009 5:11 PM
Subject: Re: [Tigers] oil temperature - slightly off topic.
>I run no bypass on the Mustang and have some holes drilled in the T-Stat
>like
> Jim's Tiger. Never, the car runs hot like a Tiger but never had a
> comparison
> of running with a bypass hose. Just always seems like an extra hose to
> leak :)
> And to the holes in the t-stat I'll bet it won't make much of a difference
> IMO, the t-stat is likely open somewhat at 175F anyway so the holes would
> not
> make much difference (They are still pretty small).
>
> Sandy
>
>
>
> ----- Original
> Message ----
> From: "Smit, Theo" <Theo.Smit@dynastream.com>
> To:
> tigers@autox.team.net
> Sent: Monday, September 28, 2009 3:05:22 PM
> Subject: Re:
> [Tigers] oil temperature - slightly off topic.
>
> Somewhat related, I choked
> down the water pump bypass a week ago and
> found it made a huge difference in
> the operating water temperature - so
> much that I might have to go back and
> undo some of my work.
>
> I ran into Jim Foster (if you're lurking, give me a
> shout sometime!) at
> the local European car show&shine at the end of July, and
> he suggested
> to plug off the bypass, and just drill some bypass holes in the
> thermostat to keep the pump from deadheading when the thermostat was
> closed. I
> didn't quite go all the way on that, but instead I threaded
> the inside of the
> bypass hole in the thermostat housing 1/8" pipe, put
> in a pipe plug, and then
> drilled the center of the plug 3/16". This
> effectively cut the area of the
> bypass port to 1/4 of what it was. Then
> I drilled 3 5/32" holes in the
> perimeter of the thermostat body, to add
> to the 1/8" hole I'd already put
> there.
>
> Previously the engine would warm up to about 190 or 200 (185
> thermostat)
> even in 60 degree weather. Now, when I'm driving the car at light
> loads
> even in 70+ temperatures, it will go back to 175 or so. So I might have
> overdone the holes in the thermostat - time to get a new one and drill
> one
> less hole in it I guess.
>
> Cheers,
> Theo
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