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Porsche Junky
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Where is your CHT....
plumbed in....
New to me 1986 Turbo...CHT thermocouple is attached to #6 exhaust stud.... Getting reading of 450 degrees and I've got it rich, on the verge of oscillation.... Is this within range??? Wouldn't the exhaust temps read higher than the cylinder head temps??? TIA
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1986 930 RUF equipped |
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05-28-2007, 12:15 PM
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Porsche Junky
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BTW...a meat thermometer touching #6 cyl head reads 180 while the CHT reads 250....
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1986 930 RUF equipped |
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05-28-2007, 12:47 PM
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Join Date: Mar 2002
Posts: 3,563
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My factory CHT sensor screws into cylinder head # 3.
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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05-28-2007, 03:43 PM
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Porsche Junky
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Thank you sir...an exhaust bolt didn't seem to be the right place to check CHT.....
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1986 930 RUF equipped |
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05-28-2007, 05:17 PM
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No, it really should be embedded into the head itself for a more accurate reading.
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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05-28-2007, 08:43 PM
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Join Date: Aug 2004
Location: Mulholland Dr. SoCal
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My readings (3.3) run between 300 to 350 deg. f
On another turbo engine (3.2 twin) where I run a horizontal fan , the temps run 250 to 300 deg. f If you can get the thermocouple sender fastened into the head itself, you could get the truest reading. When attaching it to an exhaust stud you may pick up irrelevant ambient heat off of the header tube. Marty
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Porsche builds the 21st century 9146 so easy...even a Cayman can do it ! |
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05-28-2007, 10:09 PM
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Location: "The Natural State"
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VDO makes a CHT gauge. The temp sensor is a copper washer which surrounds a spark plug and seats onto the cylinder. I have one and it matches exactly what my temp gun reads at the cylinder. I've used these on other engines and they have always read accurately.
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05-29-2007, 07:38 AM
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Porsche Junky
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Yes...mine is a VDO with a copper lead...I'm guessing it broke in the past and was rerouted to the exhaust bolt...
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1986 930 RUF equipped |
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05-29-2007, 01:29 PM
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I think it should be more centrally located between the intake and exhaust. Otherwise it will be skewed one way or the other.
Maybe you could get another lead, washer? Good Luck,
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the911den.com Instagram / UberPorsche930 https://www.youtube.com/channel/UCg4ZbACRJsODXgnlMVZsjEg?view_as=subscriber Last edited by ELZ's930; 05-30-2007 at 07:37 AM.. |
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05-29-2007, 01:47 PM
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Porsche Junky
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I've been meaning to pick up a temp gun anyways....now seems like a good time...Thanks Again!
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1986 930 RUF equipped |
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05-30-2007, 04:09 AM
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Porsche Junky
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For future searchers info:
Picked up a heat gun.....cyl head temps were reading 225-265 while VDO guage was reading 450.....
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1986 930 RUF equipped |
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05-31-2007, 01:09 PM
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mede8er,
Did you check the exhaust side and the intake side? Just for fun I would be interested in knowing your exhaust temp, and turbo temp at idle with a warm car. Just for comparisons sake. It is fun to check the temps of the intercooler in and out as well! Ok sorry, I get too carried away with this temp gun 
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the911den.com Instagram / UberPorsche930 https://www.youtube.com/channel/UCg4ZbACRJsODXgnlMVZsjEg?view_as=subscriber |
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05-31-2007, 01:30 PM
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Porsche Junky
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Hehhehheh...yeah, I was shootin that thing all over...but I'm leaving for DC in the morning and won't be back till next weekend...
I'll put a log book together then...
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1986 930 RUF equipped |
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05-31-2007, 03:20 PM
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1982 Porsche 911 SC 3.6 L
914 2.0
944 Turbo
1986 Porsche 930
