Gas test-regular was better
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 0
From: High Plains Drifter Fayetteville, AR
Re: Gas test-regular was better (ir0nmaiden420)
If you put diesel in a gasoline engine, it would probably not run at all, or run very poorly. If you put gasoline in a diesel engine, you would be buying a new engine.
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
Re: Gas test-regular was better (nodoubt)
All I have to say is :banghead: :banghead: :banghead:
I had just always heard run premium.
God I love this forum, just wish I knew this several hundred $$$ ago!
:seeya
I had just always heard run premium.
God I love this forum, just wish I knew this several hundred $$$ ago!
:seeya
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
Re: Gas test-regular was better (CFI-EFI)
I'm thinking that a lot of folks get the idea they need Hi-octane from what was needed in the old days. Back then cars ran higher compression; 10-11 to 1, with inefficient combustion chambers, and poor fuel and ignition management. Our cars are better engineered, and more efficient. LS motors are even more so, and can probably run even higher compression than ours. MY $.02.
:chevy
:chevy
Pro
Joined: Sep 2002
Posts: 515
Likes: 0
From: HAMILTON OH
Re: Gas test-regular was better (Curveit)
In the Owners Manual for my 87, it says to use 91+....but you may use lesser octane fuel at reduced acceleration. I think I'll stick to 91 at the higher acceleration! :steering: :D
Pro
Joined: Aug 2001
Posts: 617
Likes: 14
From: Loudon, TN
Re: Gas test-regular was better (toondaddy)
I've only had my 90 since July last year and up until the last couple months only used 91 octane. I tried the 89 one day to see if I could notice any performance/operation problems and after 4 or 5 tanks I switched back to 91. There was no difference in mileage or performance and I detected no ping or knock with the lower octance gas. My engine has nearly 100K on it and not knowing how the previous owners maintained it, there could be enough compression loss due to wear that the 89 works with no problem. Once I rebuild it there is the possibility that I may have to use 91.
A friend of mine uses 91 exlusively in all his vehicles even though the owners manual states that 87 is recommended. His theory is that if 87 is good then 91 is even better. He refuses to listen to my arguments that he is wasting money and hurting performance by using the higher octane gas. He believes that if it's more expensive it's better.
A friend of mine uses 91 exlusively in all his vehicles even though the owners manual states that 87 is recommended. His theory is that if 87 is good then 91 is even better. He refuses to listen to my arguments that he is wasting money and hurting performance by using the higher octane gas. He believes that if it's more expensive it's better.
Pro
Joined: Jul 2001
Posts: 557
Likes: 0
From: Taxahoma
Re: Gas test-regular was better (USAsOnlyWay)
All I have to say is :banghead: :banghead: :banghead:
I had just always heard run premium.
God I love this forum, just wish I knew this several hundred $$$ ago!
:seeya
I had just always heard run premium.
God I love this forum, just wish I knew this several hundred $$$ ago!
:seeya
Like some have already said unless you have the compression and timing to take advantage of 91+ it does you no good and actually hurts performance. The L98 is just a small block chevy even tho the valve covers have a corvette emblem on em. I would beg to say that the LT1 probably should have higher octane because of the higer compression but they also have reverse cooling which is supposed to help with detonation so you may be able to get by with lower? My LS1 based truck uses 87 just fine
diesel doesn't use octane ratings, uses cetane, cetane is how easy it is to ignite unlike octane. diesel burns much slower than gas and has a higher btu.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Drifting
Joined: Feb 2003
Posts: 1,292
Likes: 0
From: Beavercreek OR
Re: Gas test-regular was better (VictorRussell'92)
Just consulted my manual, it says 87 octane :eek: It additionally states running higher octane grades is an uneccesary waste of money :chevy So, this has been an interesting discussion and caused me to dig my manual out. I could have sworn when I originally scanned it that it said 91. A'course my VCR blinks 12:00 too :lolg:
The posts regarding compression don't really seem to state hard #'s I'm running 9.8:1 is 87 still the best choice? Save money--increase milage, I'm there if it's not detrimental to the health of my motor :smash: :cheers:
Guess I won't be buying that $6 108 octane at the track this weekend either :party:
[Modified by 86Moon, 11:45 AM 3/10/2004]
The posts regarding compression don't really seem to state hard #'s I'm running 9.8:1 is 87 still the best choice? Save money--increase milage, I'm there if it's not detrimental to the health of my motor :smash: :cheers:
Guess I won't be buying that $6 108 octane at the track this weekend either :party:
[Modified by 86Moon, 11:45 AM 3/10/2004]
Drifting
Joined: Dec 2003
Posts: 1,493
Likes: 94
From: Westfield MA
Re: Gas test-regular was better (ir0nmaiden420)
somewhat off the main topic--what would happen if you put diesel in a regular engine by accident, and vice versa?
There are two reasons that diesels get better milage, one is that there are more BTU's of energy in diesel and the other is the higher compression ratios. I like to think of them as expansion ratios actually and the more that the hot gas is expanded, the more energy is extracted from it before it is dumped out the exhauast