I need to pick up a CHT gauge and sender and was wondering where the sender mounts on a 2.7L six?
Doug C
under a spark plug on whatever engine you've got...
with only one, i think i'd use #6. it's the farthest from the fan and it's next to the oil cooler. it's also (in a 914) the most-aft cylinder and above the most exhaust pipe.
if i were doing one per side, i think it'd be #6 and #3 (the most rearward on the other side).
I have no idea what the senders look like..do they fit in the sparkplug hole (like a washer for the plug) or what? I have noticed some small allen head bolts in the area below the plugs, maybe those are utilized for the CHT senders? Also, can I run two senders for one gauge? Does your gauge reading then become an average of the two?
Here's another (related) question - When folks use the double sender for the pressure gauge (includes idiot light) and mount it next to the fan housing what then happens which the sender placed back above the flywheel area? Is it used for anything? Any real reason to use a double?
Doug C
The sender is a big ring terminal, and fits under the plug's washer. You can run N senders with one gauge, but you need to rig up a switch to connect both sender wires to the gauge input wires (so a double-pole, double-throw (DPDT) switch can do two senders with one gauge). Under the plug is the only accurate place to put them. The head does not get to a uniform temp, and under the plug gets you as close as possible to the combustion chamber, which is what you're really trying to measure.
QUOTE (DougC @ Aug 18 2005, 02:41 PM) |
I have noticed some small allen head bolts in the area below the plugs, maybe those are utilized for the CHT senders? Here's another (related) question - When folks use the double sender for the pressure gauge (includes idiot light) and mount it next to the fan housing what then happens which the sender placed back above the flywheel area? Is it used for anything? Any real reason to use a double? |
I dunno why your car came w/o a light and switch, every 911 of that vintage I've ever seen has a light in addition to the gauge. The Cap'n
QUOTE (Cap'n Krusty @ Aug 18 2005, 03:07 PM) |
I dunno why your car came w/o a light and switch, every 911 of that vintage I've ever seen has a light in addition to the gauge. The Cap'n |
I have the same issue
The spark plug installation is a BIG pain. I haven't done any measuring yet but how different do you think the temp at the exhaust header point of connection to the heads would be off? I think this installation would be close enough.
Since the temp is not exact in either location I think the header installation is just as good. Once you adjust for the new location and get your engine’s "Standard" operating temp (base temp) you will be able to tell if your running hotter then your base temp. This is all I use my gauge for. It just tells me if I am running hotter then normal. What the temp is doesn't matter too much it’s the delta T you need to look for. If your delta T is 10 or 50 degrees off normal you need to respond to each in the correct way
Just my thoughts..
QUOTE (Kerrys914 @ Aug 18 2005, 03:21 PM) |
...how different do you think the temp at the exhaust header point of connection to the heads would be off? |
There's nothing magic about the rings. They're just Al that's crimped to junction of the thermocouple wires to transfer the heat. It's those wires inside the braid that are "special". Just uncrimp the stock ring, make a new ring, and crimp it on.
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