 Cylinder Head temp sensor, question on spark plug sensor |
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| Joe Owensby |
 May 8 2008, 09:43 PM
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#1
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JoeO  Group: Members Posts: 527 Joined: 7-January 06 From: Spartanburg, SC Member No.: 5,385 Region Association: South East States  |
I have one of the Dakota Digital CHT sensors. Works great by the way. However, I have a question on the sensor that goes beneath the spark plug. Do these normally get distorted? See photo below. Using this on a set of heads from a Raby kit, with the smaller spark plugs. The sensor fit reasonably well on the plug, but it is now distorted from clamping down on the head. Thanks, JoeO
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Replies(1 - 7)
| SGB |
May 8 2008, 10:02 PM
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#2
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just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
Seems like it would not seal right. Is the opening sized for the smaller plug?
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| Joe Bob |
May 8 2008, 10:29 PM
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#3
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
I put mine under the plug and then slip the washer back on....
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| type47 |
May 9 2008, 08:34 AM
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#4
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
mine got distorted/bent up when i installed it under the plug. i seem to recall there are 2 ring sizes available for the thermocouple so maybe the smaller ring would fit your smaller plugs better.
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| HAM Inc |
May 9 2008, 08:42 AM
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#5
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
Yes, you'll need the 12mm thermocouple. That is the same set-up we use on our race car, with no issues.
BTW, how does it run? |
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| toon1 |
May 9 2008, 08:57 AM
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#6
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
Same thing happened to me. I made one out of a piece of copper , worked good
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| purple |
May 9 2008, 11:24 AM
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#7
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Pigeon feeders attract me Group: Members Posts: 938 Joined: 24-July 07 From: Houston, TX Member No.: 7,942 Region Association: None |
i would take the sealing washer off the plug if you put a ring thermocouple underneath the plug. that's what I did...
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| Joe Owensby |
May 9 2008, 11:21 PM
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#8
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JoeO Group: Members Posts: 527 Joined: 7-January 06 From: Spartanburg, SC Member No.: 5,385 Region Association: South East States |
Thanks everyone for the suggestions. I will get a smaller thermocouple.
Len, the engine runs good, lots of pep, etc., but it still wants to run hot. CHT temps will go over 390 if I drive up a long slight incline on the interstate at 70 or so in 5th. Dropping down to 4th brings them down to 375 or so. This is at only about 75 outside temperature, so it should be lower than that. CHT temps are about 360 when driving hard in lower gears. The engine has some old DRLA 40 carbs that came with a parts car, and were rebuilt by Art in Utah, per Jake's recommendation. They have 60, 140, and 180 jets. I am not sure about the venturis. I had an old std distributor, and also tried an old 009 distributor. I just received a new Mallory Unilite and coil today that I briefly tried, with not much improvement, although the engine ran a little smoother. Timing set at 27degrees at 3500RPM. All cooling tin is installed, and flapper is free. Checked the jets, and they seem clean. The only thing that seems out of what I think should be there is the idle mixture screw on cyl 2 has to be turned almost all the way in to cause a noticible drop in rpm. The others cause an effect a little sooner (starting with about 3 turns out as suggested by the Dellorato manual). I set the idle screws out 2 turns from where the engine started to stumble as they were turned in. Only have about 180 miles on car, all in short trips to check out operation and cooling. Any suggestions, or recommendations of a good mechanic in north east SC? thanks, Joe |
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