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Old 08-02-2017, 01:09 PM   #13
Cliff Pountney
Join Date: Jan 2015
Posts: 41

If for the same flow rates a decrease in specific heat capacity of about 5% would give a 4degC rise assuming you had been running at about 100degC to being with on a 20degC day. That sounds reasonable.
The small areas of localized boiling, much smaller than pin heads (nucleate boiling) should not damage the head as the manufacturer should have proved that out during their engine durability testing (mind you we are talking about Rover....). What you need to avoid is large scale boiling as this can lead to big temperature differences across components. When the vapour bubbles get around to the pump it can stop circulating coolant.
I'm not sure what temperature Rover designed the cylinder head to. I would guess a maximum of 110degC water out. What cylinder head out temperatures are you seeing?
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