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oil cooling system for 2.7 transplant
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The best cooling will be with a GT-style cooler up in the front trunk. This requires cutting holes for the oil lines, and holes for the air ducting. You do need a duct for the air, or it won't bother going through the cooler. And that loses much of the front trunk space.
I know that a number of people have put an external cooler on the engine lid. With or without a dedicated electric fan to pull air through it. I'm not wild about it, but it has worked. I have put a cooler hanging down under the rear trunk floor on my four-cylinder car. Note that this is a lousy location for cooling, as there isn't great air flow and what you have has already been warmed up by the exhaust. But it is better than nothing, and only requires a few small mounting bracket holes in the car--if you are a bit creative with running the lines, at least. --DD
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Pelican Parts 914 Tech Support A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling |
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My 914-6 3.0 has oil cooler lines running up under the driver side rocker to a GT cooler in the nose. Holes were drilled in the nose of the car as many have done. The lower valence was slightly cut and bent down at the top to allow airflow to the holes. Also the fog light grills provide air flow to the holes with block off plates. As you can tell the car (silver) looks completely stock, on purpose but gets excellent air flow. (The orange is a GT clone)
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Rick S, '71 914 3.0, '82 911SC EFI, R Gruppe #309 |
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Thanks Dave and RSBob. Those ideas are very helpful.
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1970 914-6 1988 Carrera Coupe 1999 BMW M3 1974 Triumph TR6 1974 Datsun 260Z |
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I have an oil cooler in the right rear fender well. Seems to work well with the 2.7 I have. No issues in 12 years.....
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Greg DeBord PCA Member 73 914/6 conversion 83 944 (newest addition) 99 996 aero coupe |
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I would like to see that setup...any pics?
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1970 914-6 1988 Carrera Coupe 1999 BMW M3 1974 Triumph TR6 1974 Datsun 260Z |
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I can get some tonight.....
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Greg DeBord PCA Member 73 914/6 conversion 83 944 (newest addition) 99 996 aero coupe |
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Narrow-body or flared? There is some room under stock narrow fenders, but flares would make fitting stuff significantly easier...
--DD
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Pelican Parts 914 Tech Support A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling |
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Mine is a narrow body.... I forget which cooler I got. I'm sure it doesn't cool as well as one up front, but there is a air movement in the fender well..
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Greg DeBord PCA Member 73 914/6 conversion 83 944 (newest addition) 99 996 aero coupe |
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GregD. That would be great if you can post pics at your convenience. Thanks.
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I am in the same boat - building a 2.7 RS spec engine in a narrow body. I saw a setup from a local PNW 914world member, Ricky, who mounted his cooler in the frunk, ducted, but didn't do a cutout of the front bumper - they just rolled the top lower front valence a bit to create a gap between the lower bumper and the valence, about an inch or two, enough to let the air come through the holes in the front into the cooler and out the duct.
The lines were run through the top of the driver side wheel well and back to the 914-6 style oil tank. Unless you popped the hood, you wouldn't see any evidence of a cooler (and the shroud was much smaller than the usual larger shroud used in typical GT spec. It looked clean and that's what I am going to pursue for my build. |
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Thanks for making me aware of that and I'll check that out as another possible way to go.
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Greg DeBord PCA Member 73 914/6 conversion 83 944 (newest addition) 99 996 aero coupe |
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This appears to be an even worse area for air flow than under the trunk. However, there should be some air going around it, and the fin area will help radiate some heat. You also get the benefit of a higher oil capacity which means it will take longer for the oil to get too hot.
I don't think it's a particularly good solution, but neither is the one that I used--and it meets similar constraints for not changing the body very much. It would probably benefit from some shrouding and a fan, and possibly ducting air from a cooler location. --DD
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Pelican Parts 914 Tech Support A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling |
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1970 914-6 #2615 (Metallic Green) 1974 911 US Carrera Coupe #63 (Lime Green) 1973 911 T Coupe #1891 (Gemini Blue) |
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Is this placement effective? That is right in the low pressure area that causes insufficient airflow through the engine compartment.
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1970 914-6 1988 Carrera Coupe 1999 BMW M3 1974 Triumph TR6 1974 Datsun 260Z |
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I've had this set up on my car since the 3.2 motor transplant was done 15 years ago and have never had overheating problems since. It typically never gets above 210, but I do not track the car so not sure how it would do under more extreme driving conditions.
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