LT1's and premium gas
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Joined: Sep 2004
Posts: 2,595
From: Lenexa, KS
Re: LT1's and premium gas
Originally Posted by 69z-28
does any engine NEED higher octane. no not at all, but running lower grade fuel will result in less performance and detonation and pinging noises. it is not smart to be cheap with gas on LT1s because the high compression like you said and basically the engine was built to run on a minimum amount of octane. can u get away with less, yes, is it smart, not really.
your going to probably pick up a .5-1.5mpg too so it really wont cost you any more.
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Joined: Nov 1998
Posts: 71,122
From: Hell was full so they sent me to NJ
Re: LT1's and premium gas
It also says “SEE OWNER'S MANUAL”.
Read your Owner's Manual (if you have one).
It clearly indicates:
Not sure why everyone thinks they are smarter than the engineers who designed and tested the engine. I also suggest you carefully read my post #10 above, pointing out some of the variables (altitude above sea level, carbon buildup, high coolant temperatures, high inlet air temperatures) that can change the engine's octane requirements.
Read your Owner's Manual (if you have one).
It clearly indicates:
5.7L LT1 (Code P)
Use premium unleaded gasoline rated at 91 octane or higher. You may use middle grade or regular unleaded gasolines, but your vehicle may not accelerate as well.
…………..
Be sure the posted octane for premium is at least 91 (or at least 89 for middle grade and 87 for regular). If the octane is less than 87, you may get a heavy knocking noise when you drive. If it's bad enough, it can damage the engine.
If you're using fuel rated at 91 octane or higher and you still hear knocking, your engine needs service. But don’t worry if you hear a little pinging noise when you are accelerating or driving up a hill. That's normal and you don't have to buy a higher octane fuel to get rid of the pinging. It's the heavy, constant knock that means you have a problem
Use premium unleaded gasoline rated at 91 octane or higher. You may use middle grade or regular unleaded gasolines, but your vehicle may not accelerate as well.
…………..
Be sure the posted octane for premium is at least 91 (or at least 89 for middle grade and 87 for regular). If the octane is less than 87, you may get a heavy knocking noise when you drive. If it's bad enough, it can damage the engine.
If you're using fuel rated at 91 octane or higher and you still hear knocking, your engine needs service. But don’t worry if you hear a little pinging noise when you are accelerating or driving up a hill. That's normal and you don't have to buy a higher octane fuel to get rid of the pinging. It's the heavy, constant knock that means you have a problem
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MarcR94v6
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May 11, 2006 05:17 PM