Can i use 95-97 octane?

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I didn't look up how octane is rated in the Philippines, but if it's the highest at the pump I'm sure your ok. The mix of 25:1 is recommended by manufacturer and should give you the most life out of the engine, regardless of octane rating, which only suppresses detonation.
 
Michaels12 said:
I didn't look up how octane is rated in the Philippines, but if it's the highest at the pump I'm sure your ok. The mix of 25:1 is recommended by manufacturer and should give you the most life out of the engine, regardless of octane rating, which only suppresses detonation.
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You are correct in octane suppresses detonation. Running a higher octane DOES NOT mean more performance!!! Higher octane fuel simply is able to be compressed more before flashing.

Quick octane summary....

As the piston travels up, it compresses the fuel/air. When fuel gets compressed it heats up. When fuel heats up it begins to vaporize. If compressed too much, it will heat up and hit it's FLASH POINT (temp at which something will combust without an ignition source).

So when a high compression engine runs a low octane like 87, the piston will compress the fuel past it's flash point and it will ignite before the piston even hits TDC (top dead center), which could cause catastrophic failure.

When you run a high octane in a low compression engine, the low compression of the engine won't be able to compress the fuel enough to heat it up and vaporize it to get a good combustion. Which means you could actually be losing power!!

I would just focus on running a better QUALITY 87 octane. I always run gas from Shell gas stations because I've heard they have a cleaner fuel than the off brand or cheaper gas stations offer.
 
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Well said. I completely agree.
 
Its funny u say that about different gasolines.in new jersey i watch the different gas station tanker trucks get fuel from the same spot.so is the gas different or all.smoke and mirrors...are we paying more for fuel with a designer label on it????just my thoughts....
 
Two types....or back in years gone by.

House gas, and top tier.

They differ in quality of addative packages,and general cleanliness.

Google top tier fuel.

It's really legit in my opinion, after cutting several fuel filters apart... And seeing the difference in intake tracts.
 
I think it's more to build brand loyalty, than anything. I've watched the trucks get fuel from the same place, as well. They all use the same pipelines. I'm wondering if the additives, if any, are added at the stations. The oil companies are heavily regulated, so I'm sure those additives are required by the government. Chevron's additive is probably the same as Shell's. It's just their way of turning regulation into a selling point, in my opinion.
 
What I know is when I use Shell gasoline I actually get better gas milage which means I go longer between fill ups. I usually get around 400 miles on a tank of gas. But when I use BP or other brands the gas milage is noticeably less at least 30-50 miles less on a fill up.
 
Thank you guys for the help:)i learned a lot about this engines and fuel, here in philippines octane rating, we have 91(lowest) 95 ,and 100 octane, so should i use 91? BTw, our engine for rc is high comp, or low comp? So if high comp, i can use 95octane ?

I also agree about shell, for better mileage, :)
 
You can use any of them. I'd use the least expensive. These engines do run a high compression, but high octane is not really needed. You don't get the denotation like in a 4 stroke.
 
Chances are, the gasoline from the cross country pipeline goes into a local tank farm. when it is trucked to the gas station, the dude dumps a 5 gallon pail of the secret sauce.-- chevron- techroline. shell - su 2000 ect-ect. I have a liqud cooled dirt bike-- 6.7 to 1 compression ratio- 2 stroke. It requires 95 octane. why? easy. ignition timing- port timing- power valve timing- If you want a solid baseline for fuel - and have a fat wallet, by this-- V=P small engine fuel. 95 octane thats designed to burn fast. I have been told the gas in europe is 100 octane. Any british forun members that can confirm -deny this?
 
should add-- In America,gasoline octane has 2 measurements. motor octane and reasearch octane Reasearch octane shows on the gas pumps as this-- r-m +2. This means that the gas sample is ran in a varable compression engine @ 600 rpm. soo- the octane required for our hobby engines really means diddle- our engines have such small surface areas and rev so high- you can run just about anything. yea, theres more to this game than i know- very complex.
 
alfred e numan said:
Chances are, the gasoline from the cross country pipeline goes into a local tank farm. when it is trucked to the gas station, the dude dumps a 5 gallon pail of the secret sauce.-- chevron- techroline. shell - su 2000 ect-ect. I have a liqud cooled dirt bike-- 6.7 to 1 compression ratio- 2 stroke. It requires 95 octane. why? easy. ignition timing- port timing- power valve timing- If you want a solid baseline for fuel - and have a fat wallet, by this-- V=P small engine fuel. 95 octane thats designed to burn fast. I have been told the gas in europe is 100 octane. Any british forun members that can confirm -deny this?
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Alfred i was at the mower shop the other day and i saw VP premix fuel in gallon can...but in my 88 250 r. i got a RRP race motor that requires race fuel.At englishtown mx racetrack they sell powermist race fuel and vp race fuel or i go to my local airport for 100 + octane av gas....at the end of the day I 'm a motorhead.....lol.....
 
Being a motorhead is a good thing!!! I stripped the wr down to the bare frame, had to use a thin cut 1/1/2 wheel to weaken the steering head races enough to drift out- took it to be sand blasted- powder coated.- yammrhammers were 'Radical White " Sherman williams white is close enough!! $125.00 3 week lead time. give me time to overhaul the suspension. Yea, you should see the boots-- High Point pro g p, stainless steel, made in italy. primo. - yea, the vp i mentioned is ONLY $112 for 5 gallons. I will start hunting for a decent deal via the www.
 
Yup, they lowered the octane on the automobile non ethanol in washington state.- 90. gotta add boost to keep the ford van from rattiling now. check these puppies out Idly!! brand new 2 cores!! sold a bunch more fish- this funds the bike parts- see that pink bag? used to be full of algae wafers- until the damm dog started gobbling them up with me in the hammer lane on I-84 doing about 75+ back from the fish sale---
 
Can't say I have any input as to WHERE the fuel comes from, but if your seeing multiple station trucks filling up at the same port, then I'm assuming all those stations are owed by the same higher up company. It's my understanding that the refineries is where the quality is measured.

alfred e numan said:
95 octane thats designed to burn fast.
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Higher octane isn't designed to burn fast. In fact octane delays detonation.

Yes there is a larger 'explosion' in the cylinder when running higher octane but it's not because the fuel is burning 'faster'. It's because when you run higher octane, you usually have a higher compression engine which means your compressing more fuel/air into a smaller area creating more pressure = bigger boom!

Again running a higher octane in a low compression engine is pointless. If I ran 110oct in my Geo Prizm I'd be spitting a lot of unburned fuel right out the tail pipe because my pistons wouldn't be able to compress the fuel enough to vaporize it (fuel in liquid state does not burn, the vapors burn).
 
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