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so how does it go... the higher the Octane.. the faster you go?
I did some search and found some articles and all it said was High Octane Gasoline just prevent that knocking sound in an engine blah blah blah... then everything goes Scientific....
So what do you guys think...
Horsepower is how fast you hit the Minivan... Torque is how far you take the Minivan with you... :wavey:
Originally posted by Firehawk N Wv
Mine were rusted also and the I had to cut my nuts off .
i know it has something to do with the no. of carbon molecules in a chain. higher octane reduces risk of detonation under higher psi. most gm vehicles are actually tuned to run better on 87 octane. had to take a class on this remember very little.
96 camaro auto base model<br />slp cai<br />pacesetter headers<br />flowmaster catback<br />35th anniversary ss wheels<br />richmond 3.73<br />98+ ss spoiler<br />hypertech 160 degree thermostat<br />transgo shift kit
i'll try my best to leave the science out of this...
gas is a mixture of short-chain hydrocarbons. some can burn very easily while others can take a bit more of a beating before combusting.
the "octane" rating on gasoline is an indicator of how easily the gasoline mixture will spontaneously combust. If you compress the air/fuel mixture enough, any gasoline will ignite itself. In a gasoline engine, thats not what you want. you dont want the gas to ignite itself before the spark plug lights it. If it does, you get engine knock, which is very damaging.
So basically a lower number means that the petrol will spontaneously combust at a lower compression and a higher number means that it will take a higher compression.
Performance engines tend to use higher compression (via mechanical means like stroke and head design or through boosted means by simply forcing more air into the same area) Higher compression means you can extract a bit more power out of every ignition of the gasoline. Because they want the compression, they NEED the higher octane gas.
Standard engines use a lower compression ratio (its easier to engineer and a bit more reliable on the whole, as well as cheaper for the OEM's as far as materials go). These engines can run on lower octane gasoline. Putting the higher octane stuff in them does absolutely nothing. The only exception is that if the engine (for whatever reason) is knocking with the lower stuff, and the computer is compensating for it (which reduces horsepower). If thats the case then you might feel a bit of a difference in smoothness and hp, but thats a big exception. Not the rule. 99 times out of 100, putting 93 in a car that needs 87 will do nothing but cost you more money.
funny fact tho: the "Octane" rating of the gasoline has NOTHING to do with the amount of actual octane in the gasoline. Octane by itself has an octane number of somewhere around 30 iirc... i dont know how the number got called an "octane number" but i just thought it was funny..
2000 3.8L Camaro A4 Pewter Y87<br />K&N Filter, SLP Ram Air kit, Eibach Pro Kit, Flowmaster 80 series, Silverstars, NGK plugs and MSD Super Conductor Wires, Electric Water Pump
like i said, gasoline is a mixture of short-chain hydrocarbons (the longer the chain, usually the higher the octane #.. so basically something like methane would ignite easily while a longer chain like decane would take a little bit more to get it to burn)..
Some of those molecules have low octane #'s and some high The higher the octane, the greater percent of them that have a high number. Octane booster just adds more of those high number molecules to your gas. simple as that.
2000 3.8L Camaro A4 Pewter Y87<br />K&N Filter, SLP Ram Air kit, Eibach Pro Kit, Flowmaster 80 series, Silverstars, NGK plugs and MSD Super Conductor Wires, Electric Water Pump
your average passenger car you won't notice a difference. the largest gain to be seen in cars from premium or higher octane ratings is a more complete burn. if it burns slower it gets the chance to atomize better before and burn more during. i have seen it where higher octane will decrease gas mileage and power and also otherwise. it all depends on what your running. also beware how the octane is rated in the fuel you buy. there is a few different ways. but certain ways can make 87 octane appear as 93 numbers but really has the same quality of another fuel companies 87 i think the most common is r+m/2 but just look under the octane number it tells how it is rated. this is where you hear the reference to "bad gas" some is rated worse than others and if you get one rating of 87 and another rating of 87 you might encounter kr
people need to be more educated on gas octane ratings.. yeah, you may get a few HP's from higher octane gas, ONLY because the cars computer advanced the timing a bit.
in older cars with no computers, putting high octane in a low compression engine will do NOTHING for it at all.
and i am so tred of hearing people say higher octane gas burns faster to give you more power, it is the total opposite.. the gas burns slower, which increases the combustion time, which in turn gives you more power.
the reason for knock is the gas igniting too soon from the compression of the engine, and is trying to force the piston back down, to justify this, the cars computer retards the timing to decrease knock.
right now in my other car, i am running 89octane in it, i have the timing set so far retard so its not knocking, it runs like total crap (12.5:1 comp)
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