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Join Date: Apr 2004
Location: Caledonia On. Canada
Posts: 44
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1973.5?
I have a 1973 911T which has the factory trombone oil lines and factory thermastat. Would this make my car a 1973.5? I have seen over people use this way for dating their car.
Thanks for the help in advance.
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Lorne Ross 1973 911T |
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08-24-2004, 06:40 AM
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Location: Boston, MA
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The term 73.5 is used for those cars that came with the CIS fuel system.
Welcome to this board! Randy Detroit/Windsor |
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08-24-2004, 06:43 AM
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Location: Los Alamos, NM, USA
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The factory didn't use a "trombone" (540 degrees of turn or a loop and a half) oil cooler as OEM equipment in 1973 (including the 1973.5) but instead a simple u-loop was used. If you have a "trombone" oil cooler it was added later. The 1973 external oil cooler thermostat system and lines were unique to that year (external thermostat housing mounts directly to oil tank) so if a cooler was added it was likely from a later model 911. Jim
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08-24-2004, 06:50 AM
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Thanks Jim. That clears up a lot for me. And thanks to all the people from this form as it gave me the information and confidence to completely rebuild my car which should be ready for next summer.
THANKS SO MUCH. Lorne Ross
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Lorne Ross 1973 911T |
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08-24-2004, 07:01 AM
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as far as I know, my 73.5 did not come w/ ANY oil coolers... low compression and low power made the Germans think those motors don't need oil cooling. I think they were right b/c only on one particularly hot track day did the needle make a noticeable move upwards, yet it was still nowhere near critical or what others see in regular street driving (knock on the cool collar)
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08-24-2004, 07:04 AM
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Senior Member
Join Date: Apr 2002
Location: NY
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I had a 73 1/2 CIS targa and it did not come with an oil cooler from the factory.
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08-24-2004, 08:18 AM
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Location: Denver, CO
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John,
My 1st "New" Porsche was a 73.5 911T CIS. I ordered it from Bozzani in Monrovia and an external oil cooler was an option. The U shaped cooler. 
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08-24-2004, 08:29 AM
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Location: South of the Mason-Dixon Line
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Lorne.
I have the 73.5 and have been told over and over again by several mechanics that the 2.4 was never known for overheating. In my 5+ years of ownership I have never had a problem. I added for my piece of mind, the "heet sheets" and the world famous "cooler collar". With these two relatively inexpensive additions, on the hottest of Atlanta summer days even with my AC cranking I never go over 220 degrees. Any factory installed oil cooler or aftermarket unit could only make it better! Regards Bob 73.5T/CIS |
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08-24-2004, 09:00 AM
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Location: Caledonia On. Canada
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Hi. Bob. When I purchased this car three years ago it had a completely rebuilt 3.0L engine in her. The trombone oil lines really looked like they were installed at the factory. But I now know that was not possible. Being that I do DE days with PCA, I will be installing a front vallance oil cooler next spring. Right now she is going through an extreme makeover. This winter I will be putting her back together, I hope.
Thanks to all of you guys for answering my question. Have a great day. Lorne Ross
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Lorne Ross 1973 911T |
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08-24-2004, 09:56 AM
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