 Any harm to vintage engines running unleaded fuels. |
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| 914043 |
 Sep 9 2022, 02:46 PM
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Member  Group: Members Posts: 93 Joined: 2-April 19 From: California Member No.: 23,007 Region Association: Central California 
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Back in the day when they took lead out of gas there was a lot of concern that without the cushioning effect the lead had on the valve face there would be bent and broken valves. Since my car fits those criteria and will be driving soon what if any concerns should I be aware of?? Fairly technical but Thanks for any help that might save me a damaged engine. Best to Ya
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| bbrock |
Sep 10 2022, 12:17 PM
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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Here's a rule of thumb Octane/compression chart. FWIW, I'm theoretically running 8.2:1 compression as calculated by deck height (haven't measured directly) and it run fine on regular gas. I do run at high altitude though which requires less octane. I might have to bump to mid-grade if I ever drive down out of the mountains.
And just to complicate more, ethanol blend has more oxygen than pure gasoline so runs a little leaner.  |
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Posts in this topic
914043 Any harm to vintage engines running unleaded fuels. Sep 9 2022, 02:46 PM
bbrock All 914 engines use hardened valve seats so no pro... Sep 9 2022, 03:06 PM
914043
All 914 engines use hardened valve seats so no pr... Sep 9 2022, 05:39 PM wonkipop
All 914 engines use hardened valve seats so no p... Sep 9 2022, 09:29 PM StarBear I don’t know why but my 1.8 seems to run a bit s... Sep 9 2022, 04:04 PM 930cabman As I recall lead formerly in pump gas was also a l... Sep 9 2022, 04:29 PM bbrock From what I have read, all Porsche engines since a... Sep 10 2022, 09:17 AM bbrock BTW, I've also read that all aluminum heads us... Sep 10 2022, 09:22 AM Superhawk996
BTW, I've also read that all aluminum heads u... Sep 10 2022, 10:14 AM wonkipop
BTW, I've also read that all aluminum heads ... Sep 10 2022, 04:33 PM 914043 Two more thoughts, one I faintly remember sodium f... Sep 10 2022, 10:42 AM Superhawk996
Two more thoughts, one I faintly remember sodium ... Sep 10 2022, 10:49 AM Mikey914 The greatest harm to the engine is from fire. The ... Sep 10 2022, 10:44 AM Mikey914 Our engines don't really benefit from the high... Sep 10 2022, 11:03 AM Dave_Darling
Here's a rule of thumb Octane/compression cha... Sep 11 2022, 07:13 PM second wind So this is a very interesting topic....would putti... Sep 10 2022, 05:14 PM wonkipop
So this is a very interesting topic....would putt... Sep 10 2022, 05:31 PM bbrock
So this is a very interesting topic....would put... Sep 10 2022, 06:14 PM wonkipop
[quote name='second wind' post='3028558' date='S... Sep 10 2022, 07:14 PM bbrock
AN engine (euro 1.8) more highly strung (if you c... Sep 10 2022, 10:16 PM Van B As @Superhawk996 described, you can rest assured... Sep 10 2022, 08:33 PM wonkipop @[url=http://www.914world.com/bbs2/index.php?showu... Sep 10 2022, 08:37 PM |
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