All most all cars have some sort of bypass. Many american cars have water
circulating through the heater core all the time. Most import cars deal
with it with a bypass hose, but there are some exceptions. Some dont have
anything to circulate the water when warming up, but mostly this is poor
enginering. Some companies anticipate where the hot spots would be and put
aditional material/larger water jackets there. They figure the heads won't
crack until the warantee runs out. ;-)
I think the 1/4 hole in the bypass tube is the right solution. If someone
will send me a defunct Tr 3 bypass cutoff type t-stat, I'll tell the list
if any Volvo / VW ones will work.
Don Boyd
3 Triumphs
BMW/Volvo?VW shop owner (now retired to Whidbey Is. Wa.)(not really,
there's a woman at the bottom of this....)
----------
> From: Jack I. Brooks <brooks@belcotech.com>
> To: George Richardson <gprtech@frontiernet.net>
> Cc: sweisman@GIS.NET; thefryes@iconn.net; Triumphs@autox.team.net
> Subject: Re: TR2/3/4 - Blocking the Bypass: hole or not?
> Date: Friday, August 14, 1998 12:46 AM
>
>
> George,
>
> I'm not sure. I'll check my non-LBC manuals, but don't hold your breath.
> I'm signing off the list today (short term) as I will be leaving the
> country for a week.
>
> Please let me know if anyone comes up with the answer.
>
> Jack
>
>
> At 09:21 PM 8/12/98 -0700, George Richardson wrote:
> >If this deal with the hot spots is true, why don't other vehicles have a
> >problem?
> >
> >Jack I. Brooks wrote:
> >>
> >> >Now you've got me worried. Some authorities (such as Bob Schaller in
> "More
> >> >BS About TR's") say to close off the bypass hose completely, and
that's
> >> >what I recently did. Is there a problem with that? Can it cause
> damage to
> >> >the engine? What's the collective wisdom of the listers?
> >>
> >> Sumner,
> >>
> >> I'd recommend a 1/4 inch hole in the restrictor, as you want some
water
> >> circulating through the engine when the thermostat is closed to
prevent, or
> >> minimize, localized overheating and boiling at the hot spots within
the
> >> engine, especially within the head.
> >>
> >> I've considered putting a few small holes in the thermostat itself and
> >> blocking the bypass, but whether this will work is purely conjecture
on my
> >> part. I haven't really thought it out well yet, but I think it may be
the
> >> best solution. It has the best of both worlds:
> >>
> >> Thermostat open - no bypass flow at all, everything goes to the
radiator,
> >> Thermostat closed - minimal water flowing through the thermostat
holes.
> >>
> >> True, in really cold weather, the engine may have trouble heating up,
but
> >> how often do we take these cars out in really cold weather. I run
mine
> >> into the 40F's pretty regularly in the fall, but not much lower than
that.
> >> Although... New Years Day was my last ride last year and it was the
low
> >> 20F's. ;-)
> >>
> >> Later,
> >>
> >> Jack Brooks
> >
> >--
> >George Richardson
> >'57 TR3, TS15559L - finally painting!
> >http://www.merlingroupinc.com/tr3.htm
> >
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