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Hi guys! Proud 2001 Prelude owner over here. Forgive my newbie question, but does using high octane gas really make a difference? Because I've been spending a hell of a lot of money on 94 octane. Thanks!
I remember seeing 91 octane also! its in there atleast in my 99 manual.<font face="Verdana, Arial" size="2">Originally posted by Carisear:
my manula says NOTHING about 91 octane.
all it says is:
"recommended fuel: Premium Unleaded"
so that could mean alot of things..
and hey, prelude-one -- you go to mohawk? that's the only place i know that sells 94.
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hum, any of you canadian guys with 2001 'ludes have yer manual handy? cuz i read my manual back and forth, and it never had a number on it.<font face="Verdana, Arial" size="2">
I remember seeing 91 octane also! its in there atleast in my 99 manual.
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Smoothy, read my post and veetec's and you will get a better understanding.<font face="Verdana, Arial" size="2">Originally posted by VeeTec:
You can get bad gas even when you use high octane. this is a result of the tanks at the station you use, sometimes they contain to much moisture or even worse, debris.
As for performance 87-89 actually gives you more power but increases the risk of detonation or knock from the volitility of the gas. So basically your car runs worse because its backing off on the timing.
Higher octane gas is harder to burn the lower octane, but because the possibility of detonation is lower you car runs better because its not backing off on the timing to avoid it.
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Disregard this post, i just realized it's total bunk...hehe<font face="Verdana, Arial" size="2">Originally posted by smoothludey:
Premium Unleaded is usually at least 91 octane...go and check at any gas station. Anyways, the cleaner the fuel is, meaning it's less contaminated with particles that can cause early detonation, the higher the octane number. When low octane fuel like 87 is put in a 10:1 compression, it's more likely to detonate before it's supposed to due to contaminants. So just stop being a cheap ass and get the 91+ octane fuel, unless you don't give a rat's ass about performance.</font>
Thats cool dude, no worries<font face="Verdana, Arial" size="2">Originally posted by smoothludey:
Disregard this post, i just realized it's total bunk...heheOriginally posted by smoothludey:
Premium Unleaded is usually at least 91 octane...go and check at any gas station. Anyways, the cleaner the fuel is, meaning it's less contaminated with particles that can cause early detonation, the higher the octane number. When low octane fuel like 87 is put in a 10:1 compression, it's more likely to detonate before it's supposed to due to contaminants. So just stop being a cheap ass and get the 91+ octane fuel, unless you don't give a rat's ass about performance.</font>![]()
Basically if you are running higher compression you want more octane. Say 91 octane fuel contains 91% octane and 9% heptane. Heptane is the volatile fuel that cannot take high compression before igniting...it's what causes knock. I apologize for the misinfo.
[This message has been edited by smoothludey (edited March 28, 2001).]