Sunoco 112 Octane

MarshalNorton · Jun 30, 2011

Put some of the leaded 112 octane in the combat this morning.
Boy did that wake ole girl up :shock:
Had to hang on to them there bars and I was grinin like a fool.
Shame it's $9.00 a gallon. Won't be doin this every ride but sure is
nice to feel her run as she was meant to be.
Sure miss the different Sunoco grades like the old days. :cry:
Marshal

ILLF8ED · Jun 30, 2011

That's what my combat needs. Current gas makes me believe the engine is worn out. Works, but acts like it needs a tune up.

DogT · Jun 30, 2011

Holy Cow, you can get 110LL avgas for a bit over $5 now. But not at the local Sunoco station. Yes, it does run good.

Dave
69S

pete.v · Jun 30, 2011

I have been running 50/50 110 leaded racing gas and 93 unleaded for 4 years now. A little pricey but worth to me.

travelerjerry · Jun 30, 2011

I've been doing 5 gal. of 93 octane (damm 15% ethanol :x ) and 1/2 gal. of 110 leaded racing fuel mixed with 1 1/2 oz. of Lucas Upper Cylinder Lubricant and 2 oz. of Marvel Mystery Oil. Been doing this for the last 6 years. Racing fuel quite pricey now for me, as I'm just a "50 cent millionaire" LOL. Once in awhile if I want a "Tiger In The Tank" I'll add extra racing fuel.

ML · Jun 30, 2011

Can you get Octane Booster products in the US? We're still fortunate to get no E high RON petrol here, but auto stores also sell fuel additives specifically for engines both modern and older that are designed to run higher octane where high RON petrol may not be readily available. I've never used the stuff, but I know several V8 hot rodders who do and they like it.

Mick

GRM 450 · Jun 30, 2011

Hello ML, from what I understand if the base fuel is low octane the booster juice does help lift the rating, but if the base is already high like 98, then the booster has very little effect.
Graeme

gtsun · Jun 30, 2011

There is a small airport in the town I live in, I have never been there but can I just go there and buy this AV gas you guys talk about? And is it safe for my stock 850? I would like to see what it feels like to run it on the octain levels it was meant to have.

pete.v · Jun 30, 2011

gtsun said:
There is a small airport in the town I live in, I have never been there but can I just go there and buy this AV gas you guys talk about? And is it safe for my stock 850? I would like to see what it feels like to run it on the octain levels it was meant to have.

Careful, you'll be spoiled for sure.

GRM 450 · Jun 30, 2011

Off subject a bit but this is what can happen if lower octane is used in a high compression motor.
The engine was 13.4 to 1 and needed at least 110 octane.
It ran ok on 108 then some old 108 was used for 2 laps,,,,,, result, a loose knocking sound and the bike was parked.
On pull down they found the piston pin broken and the little end bushes hammered and elongated, and the big ends hammered. Heads also damaged as were the cylinders.

DogT · Jun 30, 2011

I haven't had any trouble with getting the avgas from the local airport. I just take 2 plastic 5G jugs down and they fill it up. There is probably no road tax on it, so it's probably not legit, but they don't seem to care, I told them I was using it for an antique M/C, so maybe it is legit since I can't get ethanol free gas. You can call them first if you like, I did and they have no problems, but it's a very rural area here. You may just want to be quiet and tell them it's for an ultra lite.

Mind you, it's got blue die in it and it gets all over the outside of the carbs and in the lines, but it doesn't seem to bother anything and wipes right off. It also evaporates real quick, so make sure you have a good sealed container, like the new plastic ones with the sealed spout. Apparently it also has stabilizer in it, so it lasts a long time. Where I get it, it's BP 110LL, 110 octane Low lead, last time it was about $5.50/G.

Yes, you'll be spoiled, it runs great, and starts good too.

Dave
69S

lillygunny · Jun 30, 2011

Hi travelerjerry. Just curious, why do you put 2 0z of oil in your mixture?

Matt Spencer · Jun 30, 2011

Right . 1970 was five star , 100 Octane at the pump .Explains your 28 Deg ign. setting rather than 31 .

Spectacular and expensive picture . Says a thousand words Eh Wot .

10 to 1 blend of 100 octane shell race fuel & pump gas (unleadd) got the Chrysler so it didnt stall or take off
(returned flexableity) in carparks , and INTERSECTIONS on a cold engine , and ran properly .
Previously it was on or of about idle. Nightmare territory in the T intersection after the drive.
Used to go the other way around the block to avoid a premature demise .

DECENT fuel will get things happening when they ought to .

Ran the Van & 1951 Rover on Methanol briefly , as was in the boot & tank empty.
20:1 seemed to add an extra cylinder .Modle plane fuel is Nitro & Methanol .

Fuel injected 2 litre ran out after flying one day , tipped in model fuel .
Soundd like the head was going to go through the bonnet when it kicked.
Walked home and got wallet , as It was dry opposite gas station .

travelerjerry · Jun 30, 2011

lillygunny said:
Hi travelerjerry. Just curious, why do you put 2 0z of oil in your mixture?

Upper cylinder lubrication and to help burn out the carbon on the valves and anything in the combusion chamber. Lubricates the fuel system also. Has caused no harm so far using Marvel Mystery Oil in the last 17,000 miles. Why I put 1 1/2 oz of Lucas Upper Cylinder Lubricant Oil also is overkill. One or the other can be used. I believe it gives longer life for the throttle slides for being lubricated.

I felt that these additives would negate the 10-15% ethanol eating at the fuel system. Or I'm a sucker for gimmicks.

Ride Safe.

ILLF8ED · Jun 30, 2011

And what do you do after the first tank of super sauce runs out on a long ride?

AussieCombat · Jun 30, 2011

Holy cow you say Dave, we are currently paying $1.42 per ltr ( x 4.5 ) = $6.39 gal. for premium. (98 oct), but that
can vary by .10c from week to week.
Upper cylinder lube, try 20 mll of Castor oil per tank. Good for you and the bike. And smells like the Speedway,
unfortunately not a lead replacement.
AC.

Matt Spencer · Jul 1, 2011

makes one wonder . . .

What Compression ratio will allow full advance , 31 degree , on pump gas .

My wierd spec 72 Commando ran 8.7:1 measued, the PRE unit Bonnie 9.1 pistons with a relieved head , or 750 valves anyway.
the 55 race 500 measured 7.25:1 none of them were slow . 500 ran more Adv ( manual) Adv . on Av Gas than pump gas .

50 T-birds came out with 6:1 as was I think 70 Octane ' pool ' petrol then , or 60 .
ratios progressively increased as hi octane came available , most tourers ran lower C.R. than ' sports ' models .

68 to 72 were the wonder years of 100 octane and up to 11:1 C.R. though sometimes ign. needed pulling back at that C.R
as fuel varied according to source & season .

N.Z. the Alfa agent said recently Shell & Gull juice was better with their rorty vehicals . R.O.N. test is INDICATION of OCTANE .
blends vary , even wonder if 91 in Aus works better than 98 in the tractor engined Falcon with its staggering 4.500 rpm REDLINE.
So slow it needs the slower burn rate, this thing specs 10 deg for Auto , 6 Deg. for manual idle ign. timing . due to differant
nature of power transfer . Though thats getting a bit sidetracked maybe ? .

travelerjerry · Jul 1, 2011

illf8ed said:
And what do you do after the first tank of super sauce runs out on a long ride?

I re-use the empty white Gumout 12 oz fuel injector/carb cleaner bottle with screw cap and put in a ounce of Mystery Oil and nearly fill it with racing fuel and store one or two bottles in the saddle bag. I know of another Norton rider that just carries a small bottle of Lucas Upper Cylinder Lubricant thats intended for automobile one tank dose and pours some of it into the tank when fueling.

MarshalNorton · Jul 1, 2011

I too usually do what Jerry does. 93 octane at the local Sunoco and 2 oz's of marvels Mystrey oil.
They say in write ups engines have been disasssembled and show almost no signs of dirt inside?
I guess it can't hurt?
I ran the jungle juice yesterday just out of curiosity. It was a fun blast.
Next stop will be a local Sunoco, just wanted to see 10:1 compression at its best :mrgreen:
Marshal

pete.v · Jul 1, 2011

illf8ed said:
And what do you do after the first tank of super sauce runs out on a long ride?

I keep a 2oz bottle of booster in the boot. That's worth 2 tank fulls.

Sunoco 112 Octane

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