Glen,
Without a thermostat the coolant continues to circulate... getting hotter and
hotter... never having time for the air flowing over the fins to reduce coolant
temperature.
A thermostat doesn't only allow the engine to operate at a predetermined
temperature, but also delays the coolant in the radiator, allowing it
sufficient (?) time to cool down a bit.
Do you have a 'heat shield' on the exhaust housing of the turbo? These are
multipurpose; retain heat (more effective use of heat) and help reduce under
hood temps. Also, they aid in keeping some heat away from the compressor side.
I have a few different types that basically do the same job; stainless steel to
quilted/insulated aluminum. Even the flexible 'wrap' type work better than none
at all.
WFO Herb
Keep the sticky side down!
Glen Byrns wrote:
> I've decided to put in a blanking sleeve to improve cooling, but will
> probably put the thermostat back this fall. Is it really necessary to block
> off the bypass port/hose when installing a blanking sleeve?
>
> On days at or near 100F, the set-up I'm running now threatens to overheat
> after about 15 minutes of driving. Crossflow rad, no fan on WP, pusher elec
> thermo fan on front of radiator, thermostatically controlled oil cooler.
> Heater on, air flap closed. Water + water-wetter +~10% coolant to lube the
> WP. 30 deg. max timing advance, carb carefully tuned, not too lean. On
> days of 85 degrees or less, I can drive forever with no problem.
>
> I am getting the feeling that the heat that builds up under the bonnet is
> not finding a way out. Maybe the 5-speed fills up the tunnel a bit more,
> closing off some of the only escape for the hot air? Any other heat
> reduction tricks out there? I'll happily try most anything that involves
> the destructive use of cats.
>
> Regards,
> Glen Byrns
> '59 bugeye
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