Author Topic: 100 Octane AV Gas Good or Bad (Read 5026 times)

crp_iii · « **on:** August 16, 2006, 08:37:21 PM »

I have 18 Gallons of Aviation gas I salvaged from my Father-in-Laws tornado distroyed plane, Should I be concerned running it straight in the bikes?

My 350 loves it I hit 70 MPH with about 400 less RPMs.

Uncle Ernie · « **Reply #1 on:** August 16, 2006, 08:54:31 PM »

Most of these bikes (I find) run better on mid-grade gas, but I don't think the compression is high enough to warrant the highest octane. Stop me if you knew this; The higher the octane, the junk is in it so it becomes harder to burn. In high compression engines, the gas may explode too soon because of the pressure alone. This is what's known as pre-ignition, or pinging. Putting junk in the gas (used to be lead a long time ago) makes it harder to burn, so it only explodes when the spark plug goes off at TDC. In some engines, having too much of that "flame reatardant", if you will, can cause build-up and mess things up. In short, just using the octane you need for optimum running is probably the best way to go.

On the other hand, mixing it with 87 octane will proably save a little money by stretching the gas out some.

shields102 · « **Reply #2 on:** August 16, 2006, 09:02:33 PM »

Also, not to rain on your speed parade but...........gearing dictates speed, not power. No matter the horsepower, you will be at X speed at Y rpm. The difference in power will only effect how quickly you get there. So unless you changed your sprocket when you changed your gas, I am afraid its all in your head.

scunny · « **Reply #3 on:** August 16, 2006, 10:09:17 PM »

I used to run Av gas in my 500 for racing, just had to advance the timing a bit. as to wether it ran better it's hard to say really, but it didn't hurt it

Jerry Rxman Griffin aka MuthaF'er · « **Reply #4 on:** August 16, 2006, 10:19:17 PM »

Oh for the good old days of Sunoco 103 octane.

mrbreeze · « **Reply #5 on:** August 16, 2006, 11:58:05 PM »

About my best story about leaded premium gas was in 1974-San Diego.....I had the 69 Chevelle and run it out of gas.I was in the Navy and on the boot camp base.This guy I knew there let me syphon a couple of gallons out of his Plymouth Duster.I didn't think any thing of it and went ahead & did it.My car started but when I took off,it was like a 6 banger!!! This guy had a damn slant-6 thing going on and I was runnin' a 396 with 11.5 to 1 compession!!!! I was fine once I drove straight to the gas station and filled up with Premium(ETHYL!!!....remember that word???)I remember it was 56 cents a gallon........HELL YEAH!!!!!

Hop on a Honda · « **Reply #6 on:** August 17, 2006, 02:10:42 AM »

OK OK I was in the Navy too Royal Australian Navy Fleet Air Arm.
AVGAS (145) will melt the beast but the comertial stuff to day is Ok but only in small quantities.
Mix it with the lower octain if you have too It will not make the beast go any harder but may de coke the head a little.
Good luck dont waste it Drink it.

cben750f0 · « **Reply #7 on:** August 17, 2006, 05:40:55 AM »

i run avgas in the F1, its the stuff my G/F's brother uses in his RS125 (minus the oil), i have the wiseco kit, and it went like a rocket, made a huge difference..... and the smelll.... if guys had aroma therapy, this is what it would smell like.....

peace

jdpas29 · « **Reply #8 on:** August 17, 2006, 05:49:45 AM »

my 78 750k runs best on the cheap stuff. it warms up faster and doesn't have to have the choke out as long. it actually feels peppier on the highway, too.

eldar · « **Reply #9 on:** August 17, 2006, 07:19:36 AM »

For a stock engine, you probably will not notice much if anything. It is when you have upped your comp that the difference comes in.

aptech77 · « **Reply #10 on:** August 17, 2006, 08:34:49 AM »

I'm in aviation and have friends that race using EVERY kind of gas. 100LL(low Lead) you will loose a bit of power because of the burning of the lead. My friend use to run it in CB900F (it was free) but noticed he was .5 sec slower on it. So he went back to Sunoco race fuel.

johnny-from-bel · « **Reply #11 on:** August 17, 2006, 09:31:41 AM »

I run my 750 on 95 octane. Can't get anything lower in Belgium. I have 180.000 KMs on the clock. Engine still runs strong.
Higher octane has theoreticaly no effect on power. Its the weight of fuel burned per revolution and the energy density (Joules/gram) in combination with the compression rate that dictates power.

Buy a book on internal combustion engines if you want the full monty.

The high octain stuff may have a bit less J/gr.

Use the fuel like it is or mix it with lower octane stuff. Just make sure you have the required minimum to avoid pinging.

ProTeal55 · « **Reply #12 on:** August 17, 2006, 09:52:52 AM »

I have ran my CB on the lowest grade I can find (87) , and the highest (112) , with no difference.
So now it gets a solid diet of 87 all the time , with alittle high octane once in awhile to clean things out (plus it smells so damn good

)...

GroovieGhoulie · « **Reply #13 on:** August 17, 2006, 10:17:52 AM »

Put a couple of gallons of 100LL in my 400F a few months ago. It actually LOST some balls. I think because the octane was too high for a complete burn, either that or it was decarbonizing the head and such.

The bike normally pulled strong to redline, but with 100LL, it would run out of poop at around 9K. I rode it to the gas station and dropped a couple of gallons of 87 in it, and the pep came back.

So I think a regular gas/100LL "cocktail" might be cool sometimes, but not all the time.

It's also cheaper than Sta-Bil. 100LL doesn't go skunky like regular sulphur-based gasoline, so when storing gas in tanks or gascans that I know I won't be using for a while, I throw some 100LL in there and it helps it keep longer.

johnny-from-bel · « **Reply #14 on:** August 17, 2006, 10:34:11 AM »

Quote from: GroovieGhoulie on August 17, 2006, 10:17:52 AM

Put a couple of gallons of 100LL in my 400F a few months ago. It actually LOST some balls. I think because the octane was too high for a complete burn, either that or it was decarbonizing the head and such.

The bike normally pulled strong to redline, but with 100LL, it would run out of poop at around 9K. I rode it to the gas station and dropped a couple of gallons of 87 in it, and the pep came back.

So I think a regular gas/100LL "cocktail" might be cool sometimes, but not all the time.

It's also cheaper than Sta-Bil. 100LL doesn't go skunky like regular sulphur-based gasoline, so when storing gas in tanks or gascans that I know I won't be using for a while, I throw some 100LL in there and it helps it keep longer.

Check your ignition, you probely have a weak spark.

eldar · « **Reply #15 on:** August 17, 2006, 11:51:29 AM »

from what I have heard, all of europe uses a different octane rating system than the US does. So your 95 would be more like our 87.

johnny-from-bel · « **Reply #16 on:** August 17, 2006, 12:20:56 PM »

Quote from: eldar, Master of the K8 Thunder! on August 17, 2006, 11:51:29 AM

from what I have heard, all of europe uses a different octane rating system than the US does. So your 95 would be more like our 87.

As far as I know the whole world uses the RON octane system.

eldar · « **Reply #17 on:** August 17, 2006, 12:35:20 PM »

The US does not. it is something like and mr\2 rating or something like that.

johnny-from-bel · « **Reply #18 on:** August 17, 2006, 12:44:19 PM »

Quote from: eldar, Master of the K8 Thunder! on August 17, 2006, 12:35:20 PM

The US does not. it is something like and mr\2 rating or something like that.

I just checked the manual on my imported Chevy it says under fuel "87 RON"

johnny-from-bel · « **Reply #19 on:** August 17, 2006, 01:00:43 PM »

I got intreged and looked it up :

I did not figure my chevy manual would be written for Europe. There is a difference in EU octane and US octane

Octane is a general term used to indicated a gasoline's ability to resist engine knock. The pump octane is also referred to as the Anti-Knock Index (AKI). AKI is determined based on an average of the Research Octane Number (RON) and the Motor Octane Number (MON). The formula is RON+MON/2 normally abbreviated as R+M/2 on the pump.
Octane is tested in a single cylinder octane test engine. The MON is a measure of the gasoline's ability to resist knock under sever operating conditions. MON affects high speed, part throttle and performance (under load such as in passing). The RON on the other hand, is a measure of gasoline's ability to resist knock under less sever conditions. RON affects low to medium speed knock and engine run-on (dieseling). For a given AKI, RON is typically 8-10 points higher than the MON. As an example, 87 AKI (pump octane) fuel would have a MON of 82 and a RON of 92.

As far as I understand it AKI=RON+MON/2 and AKI is the US pump octane. Also known as PON (Pump Octane Number)

AKI (PON) 87 = RON 92

I stand corrected.

aptech77 · « **Reply #20 on:** August 17, 2006, 01:41:43 PM »

I have ran Snook race fuel in my "new" 400F and it runs like an Ape.....blah blah blah .Of course my engine is about 10.5 to 1 now.

P.S. Mike your box is on the way!

GroovieGhoulie · « **Reply #21 on:** August 17, 2006, 01:49:15 PM »

Quote from: aptech77 on August 17, 2006, 01:41:43 PM

P.S. Mike your box is on the way!

Awesome!

750k5 · « **Reply #22 on:** August 17, 2006, 02:43:48 PM »

Using AV gas will not hurt or help your engine....Higher octane fuel resists preiginition and is for higher compression engines. When you compress gasoline to a point it explodes without spark(like a Diesel) Higher octane was developed for this reason. Generally the higher the comp, the higher the octane required. But it will not hurt your engine..

crp_iii · « **Reply #23 on:** August 17, 2006, 03:16:12 PM »

I was hoping the speed was not in my head, but it still seems to run better.

Quote from: cben750f1 on August 17, 2006, 05:40:55 AM

i run avgas in the F1, its the stuff my G/F's brother uses in his RS125 (minus the oil), i have the wiseco kit, and it went like a rocket, made a huge difference..... and the smelll.... if guys had aroma therapy, this is what it would smell like.....

peace

The smell is great - It is blue to boot, I transported some in a washer fluid bottle and it looked just like Windex. Tastes better though.....

cben750f0 · « **Reply #24 on:** August 17, 2006, 05:23:33 PM »

lol, dont think i will be drinking it any time soon!!!!!.. though i think windex would clean your windows better:P...

peace

6adan · « **Reply #25 on:** August 17, 2006, 08:32:32 PM »

On this av gas thing, dose bore size have anything to do with what grade gas should be used?

angeldeville · « **Reply #26 on:** August 17, 2006, 10:50:27 PM »

Quote from: 6adan on August 17, 2006, 08:32:32 PM

On this av gas thing, dose bore size have anything to do with what grade gas should be used?

no compression is the key factor

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Author Topic: 100 Octane AV Gas Good or Bad (Read 5026 times)

shields102

Hop on a Honda

eldar

johnny-from-bel

johnny-from-bel

eldar

johnny-from-bel

eldar

johnny-from-bel

johnny-from-bel

750k5