Quote:
Originally Posted by RET_COP
Does anyone block the bypass coolant hose and modify the thermostat thus forcing all the coolant in the block at startup through the radiator? Just curious as I have heard of this practice, supposedly it will result in longer warmup times but uniformed cooling?
Lou
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You need to have water circulating through the block as it's warming up. Otherwise it heatsup unevenly, and you'll get hot spots around the chambers and cold spots around the cylinders.
Race engines can without it, but that's because they don't have a thermostat. That's how the original weber manifolds were built, Y hose and no thermostat.
That's also the reason many cars have trouble keeping warm on the freeway - no thermostat.