I've heard people say the higher the octane the lower engine temperature. Is this correct or not. I run 110 octane leaded fuel called renegrade mixed with bel-ray mc-1. 1 pint to 4.7 gallons of the gas
Octane questions? correct or not?
- Thread starter Blaster200boy
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The octane level is determined by the compression that you are running. Unless you are above 175lbs of compression then it isn't helping you, it's hurting you.
yeah just go with the reg hightest...... itll be fine. irun just plain silver grade gas and she runs like a champ.
octane has to do with your compression ratio,static compression and or ignition timing.You can run higher octane running a low static compression if your ignition timing is heavily advanced.Its not as simple as"im running xxxlbs of static compression so i should run 110 octane"there are more factors involved then just static compression.
wow, 110 on a stock motor, That has got to be getting expensive! You dont need to be spending all that extra money on race gas that thing should run on dog piss if you really try.(ok, well maybe not actual dog piss but 87 should do just fine)
i am running 110 leaded in all of my Blasters' and they are currently stock and the one in my signature. i switched to this fuel because of quality and consistency. first, i understand that the most power an engine can reliably make is from using the lowest octane fuel that will not cause pre-detonation in an engine. however, when i made the switch i could not tell the difference in the power of my blaster. i could however tell that it was running much better- smoother and cooler than when i was running pump gas. my blaster starts easier, runs cleaner, and is more responsive when being ran hard. i originally switched to it because of a trip i took to the dunes, it was the first time that i tried to go on a fast ride with my friends with banshees, yfz450s, raptors, and a modded trx250r. i was running it hard wide open 3rd gear most of the time (just to be able to see them crest the next dune over from me). anyways my engine was really hot and pinging, which was causing me concern. so, i decided to buy some 110 and see the difference. my rationale for using the 110 was that the blaster gets great mileage and i needed something better to keep my engine alive. i now will not go back to pump gas as i have found that the $8.79 a gallon for the 110 a value for my needs as i have yet to use more than 8-9 gallons of it a weekend. if you google "ethanol free fuel in your area" as i have i have found a couple of places that will pump ethanol free fuel into a gas can. i may try and blend that with the race fuel to see if i can get the same benefits of 100% 110- smoother and cooler running- while saving me a little $$$. if you have an airport in the area you may want to try 100ll as it is cheaper than 110 and should provide the same benefits. i hope that this helps to explain why i made the switch. know i am going to google my area for place to get 100ll avgas- as it is getting harder to find now that it is being phased out of production (from what i have been told) because of the lead content. I also will not have an engine built to run only race gas as i do not want to be required to use 110. ciao!
running TOO MUCH octane can be a problem as well. octane is the resistance to detonation.. not a level of power in anyway.. i;ve explained this about 20 times roudn here.. instead of me typig it all out i'll find an old post and opy and paste it..
and it;s more than just i have *** psi so i need ***octane
compression ratio, timing advance, and static compression all play in..
and it;s more than just i have *** psi so i need ***octane
compression ratio, timing advance, and static compression all play in..
here ya go..
octane is not a measure of "power" but more ameasure of resistance to knock ro resistance to detonation.. higher octane fuels burn SLOWER not faster.. so when your buddy with the civic and the fart can exhaust tip puts 93 in his all stock civic he's actually making it SLOWER!!! ok lets look at it this way..
just for easy figuring sake lets say that your spark plug fires at 10deg BTCD (before top dead center)
you want the flame front to have built enough cylinder pressure to give you a full "push" on the piston down stroke..
lets say we are shooting for 15deg ATDC (after top dead center) and on pump gas teh flame front is timed to actually hit that 15* ATDC
now when you put say 110 octane fuel it burns sigficantly slower than say 93 octane.. so with the same compression and timing your flame front is ending and you "push" may not come till say 30* ATDC you've now lost 15* of "push" therefore your making LESS power.
higher compression will accelerate cylinder pressure and therefore cylinder temp and will aid in the combustion process and the flame front will burn faster... added ignintion timing will light the mixture sooner so the flame front will end at your desired time. added ignition timing helps in the low-mid same with higher static compression but these things in excess will hurt your topend power.. you've probably heard the saying before.. "good if used in moderation"
you diggin what i'm shovelin???
octane is not a measure of "power" but more ameasure of resistance to knock ro resistance to detonation.. higher octane fuels burn SLOWER not faster.. so when your buddy with the civic and the fart can exhaust tip puts 93 in his all stock civic he's actually making it SLOWER!!! ok lets look at it this way..
just for easy figuring sake lets say that your spark plug fires at 10deg BTCD (before top dead center)
you want the flame front to have built enough cylinder pressure to give you a full "push" on the piston down stroke..
lets say we are shooting for 15deg ATDC (after top dead center) and on pump gas teh flame front is timed to actually hit that 15* ATDC
now when you put say 110 octane fuel it burns sigficantly slower than say 93 octane.. so with the same compression and timing your flame front is ending and you "push" may not come till say 30* ATDC you've now lost 15* of "push" therefore your making LESS power.
higher compression will accelerate cylinder pressure and therefore cylinder temp and will aid in the combustion process and the flame front will burn faster... added ignintion timing will light the mixture sooner so the flame front will end at your desired time. added ignition timing helps in the low-mid same with higher static compression but these things in excess will hurt your topend power.. you've probably heard the saying before.. "good if used in moderation"
you diggin what i'm shovelin???
yep i understand. but, i have seen the difference on a dyno and there is a mathematical calculation that shows changes in horsepower/torque when changing octane in fuel. i speak in general terms and i am not going to find or go through the equation to prove this point. my data came from someone i know that worked for a major racing team and i have read about it in trade journals. this of course is based on a constant and that constant is a stock engine or one tuned for the lower/normal octane fuel.
sweet, thanks! I thought that they quit selling 100ll in the portland area. I guess that I should have made the call! I was buying my 110 from midnite motorsports until they closed their doors and they are right there by the airport! I:I
gonzo,
Why are so many of your posts negative, non-productive, and not relevant to the conversation? What the hell is the above post supposed to mean? Why waste both your time and ours with a bullshit post such as this- you do not even give a reason for your position. I am asking you to please keep your comments to yourself if they do nothing to further the conversation. :-/
so i was looking at this thread and i was wondering what octane i should run on?
mods are on my sig and im useing the lowest grade at the pumps right now
mods are on my sig and im useing the lowest grade at the pumps right now
Just use 91 or 93 the higer the octane the hotter it burns... Unless of course your fully built.
burning oil, its such a simple statement, av gas is for airplanes they all have de-icers for altitude, now do you fly your blaster? its real simple its aviation fuel for a reason and a blaster is not an aviation vehicle, and now here it comes everyone that uses it will be comin on sayin how great it is, and you no what so is premium fuel, but I race my blaster so I need race fuel, you probably show up to a classic car show because your car is a caprice "classic"
If your Blaster was pinging then you do need a little more octane but save yourself some money. You can blend 100LL (or race gas)with 92 at 50/50 and get a nice 96+ octane that will more than enough for your needs. There is nothing special about avgas. It will run fine in any internal combustion engine that can use the higher octane and it is a little cheaper than race gas. Your Balster dose not need wings.
NOTE, Going from pump gas to race gas or any blend may require jetting. Race gas and avgas have a higher gravity and will run a little leaner.
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100ll works fine in 2 strokes.. it has very low traces of tetraethyl lead.. same thing in leaded race fuel.. i've ran it for a few years... now putting 100LL in a race gas engine is not reccemended.. to low of octance and it will ping.. but for a pump gas engine with a little exta compression or little extra timing.. it'll work fine.. the de-icer is not a big deal... but if gonzo is dead set on that then we'll even it out with a positive point.. AV gas will keep WAAAY longer than pump gas.. no ethanol, and has a stabilzer forumulated into it..
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