 Any harm to vintage engines running unleaded fuels. |
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| wonkipop |
 Sep 10 2022, 08:37 PM
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#21
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Advanced Member  Group: Members Posts: 4,670 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille 
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@wonkipop I think the heads may have been different due to runner configuration for the carbs.
[/quote] i thought that too ------- to start with. but i fully investigated it. there was a small inlet casting that bolted up to the same studs and casting area that the fuel injector/air inlet manifolds bolted up to. the inlet casting transitioned the single barrel carb on each side into two inlet tracts into the head. so i don't think it was that. |
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| bbrock |
Sep 10 2022, 10:16 PM
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#22
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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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QUOTE(wonkipop @ Sep 10 2022, 07:14 PM)  AN engine (euro 1.8) more highly strung (if you can call a VW engine that) - 8.6:1 - 98RON top shelf drinking habit. the dean martin of VW engines. (IMG:style_emoticons/default/av-943.gif) |
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| Dave_Darling |
Sep 11 2022, 07:13 PM
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#23
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914 Idiot Group: Members Posts: 15,067 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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QUOTE(bbrock @ Sep 10 2022, 11:17 AM) Here's a rule of thumb Octane/compression chart... Note that our engines do not follow this chart very well. The combustion chamber shape, mixture and timing control, and cooling that we have generally means we suffer detonation earlier than more modern engines do. In stock form, the 2.0 and 1.8 engines take regular-grade fuel. The 1.7 engines (except for the low-compression California-only 73 1.7) take super-grade. The European-spec 2.0 (8.0:1 compression) takes mid-grade, and the European-spec 1.8 (8.5:1) takes super-grade. --DD |
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