I also run only a 180. Higher temps also require higher pressures to keep it
from boiling. Hot spots in the block cause the water to boil; the steam
pushes the water out and it overheats even worse. That's why an engine can
run cool for awhile, then suddenly peg the temp gauge. Too cool a thermostat
doesn't burn the water out of the oil, and also causes the engine to run
less efficently. It also hurts heater performance (In Texas, nobody cares
about that). A high temp thermostat would probably be ok in a rig that never
runs hot and is run in a cooler climate. Down here I don't trust them.
----- Original Message -----
From: <CLLLSLS@aol.com>
To: <oletrucks@autox.team.net>
Sent: Friday, August 18, 2000 2:02 PM
Subject: [oletrucks] 180 vs higher temp thermostats
> Hey everyone,
>
> Just tore down and built the 350 in my newer rig, a 79 silverado, and I
was
> wondering about the thermostat. I've always put 180 thermostats in
> everything, but a friend tells me, and I've read in the instructions that
> came with my pistons, that the higher temp thermostat you run, the less
> cylinder wall wear you will have. Well, not necessary less wear, but less
of
> a ridge at the top and more even wear. I understand the factor that
> contributes most to the cylinder ridges is the expansion of the cylinder
wall
> inwards at the top due to the heat building up in the top deck of the
block.
> It makes sense that running a lower temp thermostat will cause more
> temperature differential between the middle and upper areas of the
cylinder
> wall therefore more wear at the top. My question is What will I sacrifice
> running a higher temp thermostat and what temperature would you guys
suggest?
>
> The engine is:
> balanced '70 350
> +.030"
> comp 270 (224 deg. single pattern)
> keith black hypereutectic 10:1 cr
> performer rpm air gap
> carter 625
> 1.94/1.50 76 cc heads
>
> Dustin
> 50 & 53 GMC 1/2 tons
> 48 GMC 3/4 ton
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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