 Gasoline - 90 Octane, Ethanol Free (89), or additives, How to reduce valve knock |
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| dcecc1968 |
 Feb 6 2019, 07:46 AM
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Member  Group: Members Posts: 251 Joined: 31-December 12 From: Concord, NC Member No.: 15,313 Region Association: South East States  |
We are having some Spring weather this week in Charlotte, NC (and no rain!) so I've been driving the 914 and noticed that after about 20 minutes of driving, the valves intermittently knock from "normal" to very loud for no apparent rhyme or reason.
Outside of the obvious that it may be time for a valve adjustment, I wondered what Gasoline grade folks are using. What Petro are you using in your 914? |
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| bbrock |
Feb 7 2019, 10:21 AM
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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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At what compression should you start thinking about higher octane? More specifically, 8.0:1 compression?
Side question: Anyone know why they raised the octane of regular gas in high elevation states? Until a couple years ago, regular gas in Montana and surrounding states was 85, then a couple years ago, they suddenly raised it to 87. Emissions standards? I always thought it was better to run a little lower octane at altitude to compensate for lower atmospheric oxygen content. (IMG:style_emoticons/default/confused24.gif) |
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Posts in this topic
dcecc1968 Gasoline - 90 Octane, Ethanol Free (89), or additives Feb 6 2019, 07:46 AM
TheCabinetmaker Check your timing Feb 6 2019, 07:54 AM BeatNavy A well-tuned stock engine (with stock compression ... Feb 6 2019, 07:58 AM porschetub Loose valves are a clatter/rattle not a knocking,i... Feb 6 2019, 12:34 PM
914_teener
Loose valves are a clatter/rattle not a knocking,... Feb 6 2019, 12:55 PM Dave_Darling If it really is valve noise, the probable causes r... Feb 6 2019, 01:13 PM dcecc1968 Thanks for your suggestions. I will definitely ch... Feb 6 2019, 02:17 PM wndsrfr
Thanks for your suggestions. I will definitely c... Feb 6 2019, 03:34 PM Dave_Darling
Side question: Anyone know why they raised the oc... Feb 7 2019, 03:52 PM Mark Henry
Side question: Anyone know why they raised the o... Feb 8 2019, 12:21 PM 914Sixer Check around at Pure Gas.com and see if there is a... Feb 7 2019, 01:12 PM Mikey914 I only run ethanol free and additive for lubricati... Feb 7 2019, 02:22 PM jfort this thread is close to my question so I'll co... Jul 11 2019, 02:17 PM FlacaProductions @mikey914 - what additive do you use?
this car is... Jul 11 2019, 06:58 PM |
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