I have even tried the ir heat gun like the V8's use to see the temp on the track and both martec I ran them on the same speed and let them run on low...
Yeah, they do that to ensure there's no air cavities ; was your chamber heated as well to boil off trapped moisture for the vacuum pump to extract?
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Yeah!!!!! Finally the new replacement Martec 316 fan arrived. Its taken about 6 to 7 weeks to get it. Trouble is I'm busy doing other work so I will...