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Yair G'day Rusty and all,
SHORT ANSWER
We need some way to determine the temp of the housing just below the Leading plugs to avoid boiling out the coolant. My good mate Paul "Let's run the numbers" Lamar, (bless his TES O rings), was correct in that there really needs to be a temp probe in that area. Any sensor anywhere else (Especially in the rad) will actually read lower.
The point is that you need to sense the temp close to the plugs as that is where the engine is hottest, and where damage will occur if you convert it to a Stanley Steamer. The mod is easy to do. Just drill and tap a hole to fit a temp sensing SWITCH just below (AND to the side - there is a web directly above and below the plugs) of the Leading #2 plug area. All it needs to do is communicate with the water jacket in that area. WARNING !! Before you all start drilling, have a CAREFUL look at an old rotor housing to see EXACTLY where it needs to go, ... be careful ... there are through bolts above and below the plug holes!!
As for sensors, it is possible to buy a variety of pretty reliable temp switches from VDO etc. You want someting that comes on at around 110 Deg C. They are small, and reasonably cheap to buy. My preferred solution is to have one in each housing, and connected in parallel to the pump relay as well as a BIG BRIGHT warning light and / or a piezo-electric 'screamer" to get your attention in case you ar blind (like most race drivers!!).
Yeah I know, ... more complication, but it will save you a rebuild, and also save you from aborting your flight (or race).
LONG ANSWER ( 25,000 words or more coming!) }:>) Cheers,
Leon
On 18 Oct 2003, at 10:45, Russell Duffy wrote:
SNIP>>
What are your thoughts (in 5000 words or less <g>) about using temp to
notice the failure of a pump? In other words, you're flying along
with only one pump running, and it fails. How long do you think it
will take before the aux pump will kick in due to the higher temp? More importantly, what do you figure the chances of boiling out
coolant, or damaging the engine will be before the aux pump comes
online? I'm betting that you and Lynn (who's also been mighty quiet
on this subject) have had seen failures than all the rest of us
combined. Thanks,
Rusty
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