 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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| jfort |
Jul 11 2019, 02:17 PM
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Senior Member Group: Members Posts: 1,134 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest 
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this thread is close to my question so I'll continue it
just got off the phone with Richard Parr of PMO. Very knowledgeable. He emphasized the desirability of using ethanol free gas. (And I am hearing this more and more from small engine repair guys.) There is a place here that sells it (ironically, the agricultural coop place) but the octane isn't that great. I forget, but maybe 90. I am running 10.8:1 and want higher octane, say 93. Has anyone done the research on off-the-shelf octane enhancers. Do any of the many fuel additives help with what we need for our engines in terms of octane and lubrication? |
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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 bbrock At what compression should you start thinking abou... Feb 7 2019, 10:21 AM 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 FlacaProductions @mikey914 - what additive do you use?
this car is... Jul 11 2019, 06:58 PM |
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