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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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Internal thermostat opens partially - ~2/3 - toss?
Wonder what y'all think about this. I've asked locally and gotten opinions on both sides.
Have been chasing an overheating problem. I know my mixture or ignition is part of it, my CO is like 1.8%. That should be easy enough to solve. However, while covering my bases, I pulled the internal thermostat to check it out. It seems to function properly, it begins to crack around 140 deg F and stops opening at around 185 or 190 deg F. However, it only ever opens about 2/3 of its 'window'. Took it up over 200 and it did not open any more. Is this restricting flow to the cooler and costing me potential cooling capacity?
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Several BMWs |
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10-08-2007, 06:22 PM
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Registered
Join Date: Nov 2001
Location: Jamestown,NC USA
Posts: 1,291
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Dave,
I would start with the mixture and go from there, 1.8 is very lean. I try to eliminate every possibility before throwing money at it. Are you going to RR3? Paul
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My ignition is retarded. |
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10-09-2007, 07:02 AM
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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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Hi Paul,
Yep, I'm going to RR3. At this time it looks like I will need to work Friday so I'm planning to fly in Friday night. Dustin and Tim should already be down there so I'll ride home with them. I can't wait! I've got the engine out right now doing some work to it. While out I'm trying to do a few things to maximize cooling, like doing the cooling tin mod and changing pulleys. The Targa does not have a front cooler so I'm trying to maximize cooling at the back of the car. If I am leaving additional cooling on the table by installing a worn-out or malfunctioning thermostat, I want to replace it now while it is easy to get to. This is on the '76 CIS that is a PITA to access in situ, not the '72 MFI car.
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Several BMWs |
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10-09-2007, 07:07 AM
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Dave,
I am cheap when it comes to buying parts; BUT, if you are cutting off 1/3 of the flow through the system, you are also risking not oiling the rod bearings enough right? Replace it, you are already over budget anyway 
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Donnie Currently Porsche-less..... 
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10-09-2007, 07:25 AM
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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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I don't think there would be any oiling issues, as any oil blocked from entering the cooler would just be bypassed. At $129, I don't want to replace this thing if I don't need to do so.
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Several BMWs |
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10-09-2007, 08:41 AM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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Thermostats for a modern car like that (not SWB) are cheap, replace it.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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10-09-2007, 09:46 AM
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Beg the money from someone and get that POS out of there! 100% or nothing!!
Best!
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Recording Engineer, Administrator and Entrepeneur Designer of Fine Studios, Tube Amplifier Guru 1989 Porsche 911 Carrera Coupe 25th Anniversary Special Edition Middle Georgia |
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10-09-2007, 11:06 AM
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Registered
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Quote:
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Donnie Currently Porsche-less.....
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10-09-2007, 03:29 PM
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'74 Porsche 911 2.7
