quote:Originally posted by David B:
Thanks FAST. I always was surprised how fat the temp rises to warm up - just a couple of minutes.
So is there any point or problem with using the Robert Shaw t-stat with a hat?
Any idea what might be causing the temp to suddenly rise and fall when I'm cruising, if it isn't a sticky hat?
Here's the old and new.
...Geez!! I post Pictures and You Guys STILL Don't get IT!! Yes! David B., I have TWO ideas as to why your temps are fluctuating. 1. Go back to page 4 of this thread and look at photo #5 and see the relationship between the Correct Themostat and the Brass Restrictor Plate. In the picture, ofcourse the Thermostat is, in-fact, Closed, but what I want You to see, is the 'Hat' sticking UP through the Plate; AS IT WOULD when OPENED!! The fact that You are running a BLOCKED Plate tells Me, if You ARE running the Proper Thermostat with the Hat; that the Opening of the Thermostat is being 'Jammed-Up', by the Blocked Plate, and is being Prevented from Opening Fully. This may very well have damaged Your Thermostat! 2. The first thing I see in YOUR Photo is RUST! There should be NO rust in the system what-so-ever!! This tells Me that You are probably NOT using a 50/50 mix of H2O to Antifreeze/AntiBoil (I use Prestone with great success). This could be THE defining factor of Your problem. The proper Mixture Makes a HUGE difference in Heat Transferance!! And the side benefit of using Preston is it incorperates a 'Rust Inhibitor'. Last, Yes! Your Coolant does heat-up fast! Only because it is NOT circulating, it is just 'sitting' there stagnet. Read GP's advice about thermo shock to the heads. Good-Luck with it! Marlin.