Leaded 110 Octane Fuel

Johnnymac · Aug 27, 2012

As it turns out, the shop down the road from my house (a reputable Performance shop) has various racing fuels available. I took my 2 gallon gas can down there today and bought 2 gallons of their 110 Octane Leaded fuel. Before I added it to my Combat... I wanted to make sure that I wasn't going to screw something up. I'm running the JS motorsports Carbs and as far as I know the rest of the engine is stock Combat.

The guys at the shop said that it should work great. Just wanted to check here first.

Thanks!

comnoz · Aug 27, 2012

The leaded fuel won't hurt the motor a bit but if the carbs have been jetted correctly for pump gas they may not be right with race fuel. Jim

lillygunny · Aug 27, 2012

I use 110 octane leaded racing gas in all my bikes and will continue for as long as I can get it. Matt is delighted that I use it in the CNW Commando.

Ron

Johnnymac · Aug 27, 2012

comnoz said:
The leaded fuel won't hurt the motor a bit but if the carbs have been jetted correctly for pump gas they may not be right with race fuel. Jim

"jetted correctly" leaves a lot wiggle room for me... I have been tinkering with the jetting since I installed the JS Carbs on Day one. I think that I finally have it close to where it needs to be for pump gas... but I'm sure that it isn't 100% perfect.

The 110 Racing fuel is $7.99 a gallon, but it is obviously much better quality than the stuff you get at the pump. (Cheaper than pump price in Britain though - Sorry UK guys).

pete.v · Aug 27, 2012

I have run 50/50 110 racing gas and premium 93 no lead since I have own my bike.

I have a few 5 gallon containers. I get 2 1/2 gal of racing gas it each one then go over to the other pumps and top them off with the no lead.

110 goes from 4.99 to 6.99 around here. Avegas is not an option around here.

Whitworth Ranch · Aug 27, 2012

What Jim said...

California pump gas has caused me to jet about 10-15 percent richer than I would with leaded 110. Don't know your fuel out there.

If I were in your shoes, I'd just run it.

I had to swear off of leaded 110 because all my stuff ran so much nicer with it, but it was $8-$10 per gallon. So I just quit and retimed and rejetted to run on California 91 pump, giving away some running quality, response and horsepower.

The Velo spark timing needed to come back to 33 degrees from 37 max advance. I had to retard midrange spark three to five degrees on a couple of cars (electronic programmable distributors).

Luckily, the Commando chamber seems pretty deto resistant at stock compression, so I still run 31 max advance with that Tri Spark ignition. But I did have to use #3 slides (instead of standard 3.5) and needed to lift the needle one notch from standard (it's now in the middle).

Pour it in...see what happens. The experiment will be over in 100 miles or less.

Snorton74 · Aug 27, 2012

lillygunny said:
I use 110 octane leaded racing gas in all my bikes and will continue for as long as I can get it. Matt is delighted that I use it in the CNW Commando.

Ron

I'm in the same boat as you Johnnymac. A couple of weeks ago I stopped at this new gas station right near my shop. They had 92 and 100 clear gas, and 110 leaded. I filled up my recently rebuilt Westy with the 92 and it just took off. So I was wondering what I should use in Cdo? I've been putting the 92 in my 76 CB 750f with good results, but was wondering about using the leaded gas. I'm glad to hear that Matt is cool with it, since I'm expecting my rebuilt engine and trans from him soon. What kind of carb(s) are you running lillygunny?

lillygunny · Aug 27, 2012

Matt put keihins on my rebuild. The Gold Star has an Amal GP, the RGS has an Amal 389. They all run perfectly. After my original Combat fiberglass tank was destroyed by pump gas, I hope to never use it again, though I fear one day unleaded racing gas will be unavailable. It is expensive, but I do not put a lot of miles on these bikes.

Ron

Hobot · Aug 27, 2012

Racers like high octane because they can up the CR and timing to take advantage of its anti-detonation help but hi octane is not a power adder w/o altering engine to require it, as higher octane is harder-slower to ignite so needs more spark advance for more pressure pre TDC and then less fully heating the nitrogen on the piston crank thrust angle. Of course if engine is a faulty build and sharp edges or coked up or not enough cam overlap for the CR, then yep will run smoother on higher octane. Bragging rights belong to those making hi power on lowest octane with faster burn, retarded spark, combustion chamber characteristics. There is a bit of confusion about which has more power content, hi octane has a few more percentage points power content going by weight of same amount of low octane, but low octane has few more % pt's power content by volume. All references state that running higher octane than needed does not hurt anything by wallet size. New engines with 'puter brains can adv. spark to get some benefit power and mileage wise on higher octane. Here's a good brief read on this subject.
http://wiki.answers.com/Q/Will_higher_o ... more_power

J.A.W. · Aug 27, 2012

Put a squirt of acetone in it ~ 10ml/10ltr, that`ll zest up the heavy gas some..

Torontonian · Aug 27, 2012

Yes, no probs. with the original 110 octane searchings, but think about why TEL (leaded gasolines) were made illegal. The Roman's with their lead - lined aqueducts found out too late with madness , sterility etc. End of Empire. Ask the British too the history of lead- based makeups. As a sports-fisherman I know the hazards of lead weights. Burning lead and spreading it all about the countryside is just plain old bad news. For the future. Leaded petroleum products are illegal in my country , Canada. Enjoy, Peter.

J.A.W. · Aug 27, 2012

Dont believe the hype, most Pb issues were form kiddies injesting lead paint. The replacement aromatics, ie Benzene, are known carcinogens with no safe level of exposure...

Snorton74 · Aug 27, 2012

Torontonian said:
Yes, no probs. with the original 110 octane searchings, but think about why TEL (leaded gasolines) were made illegal. The Roman's with their lead - lined aqueducts found out too late with madness , sterility etc. End of Empire. Ask the British too the history of lead- based makeups. As a sports-fisherman I know the hazards of lead weights. Burning lead and spreading it all about the countryside is just plain old bad news. For the future. Leaded petroleum products are illegal in my country , Canada. Enjoy, Peter.

What about the dirty tar sands? JK

Hobot · Aug 27, 2012

Lead is bad juju and requires other additives to burn off crusts on valve and such. I'm old enough to have done many lbs of lead pours in old fashioned cast iron sewer pipe joints. Glad no more of that. The unhappy part of fuel improvements is it leaves the old farts engines at risk, like ethanol now. BTW slower combustion is felt as smoother combustion and the HI rpm garden tractor guys run 112 octane which burns all the way past BDC on them. They store barrels of it and what I'll first run in Peel on, just in case, before working down octane scale.

Acetone is used to get more mileage in some cases, I tired it over a range of ratio's but didn't detect any help in old Oldsmobile. its also used to dissolve glass resins and paint. Peel avoids all these issues with no lead no boze low octane and windshield washer fluid. I might try those drop in catalysts to see what it does or don't. Peel will be metered enough to know, if seat of pants not registering it.

Johnnymac · Aug 27, 2012

Very interesting guys. Thanks. I'm not o much looking for a big performance gain as I am looking to get beter quality fuel. I spent a fortune getting my tank redone because of the damage that the shitty fuel did. We have over here in the USA. Some areas can get fuel with no ethanol at the pumps, but not here in St. Louis. I don't put a lot of miles on my bikes so I don't mind spending more for good gas. And if I do get better performance... I will certainly report back here either way. Looks like nice weather tomorrow in Missouri so I will let you know.

DogT · Aug 27, 2012

You can go to your local airport and buy 110 octane low lead gas for less than $6/gal. I've been using it in my bike for 2 years now and the plugs are clean and bright after about 1K miles. It starts and runs like a champ. I do it because I don't want to spend the money on the metal tank and I just don't ride that far anyhow. Big plus is no ethanol. My local airport has BP110LL.

Get it, I wouldn't worry about it.

Dave
69S

Hobot · Aug 27, 2012

Nice pair there Dave!

DogT · Aug 27, 2012

Almost afraid it's a bit lean, but no blue on the pipes and no pop after it warms up.

Dave
69S

Whitworth Ranch · Aug 27, 2012

DogT said:
You can go to your local airport and buy 110 octane low lead gas for less than $6/gal. I've been using it in my bike for 2 years now and the plugs are clean and bright after about 1K miles. It starts and runs like a champ. I do it because I don't want to spend the money on the metal tank and I just don't ride that far anyhow. Big plus is no ethanol. My local airport has BP110LL.

Get it, I wouldn't worry about it.

Dave
69S

It was in the 1990s that I could no longer get Avgas at the local airport. In the '80s, I could pull up in my car and fill up at the pumps on the strip. Later, it had to be in cans and after that you had to have an N number and it had to go straight in the plane.

Hobot · Aug 27, 2012

Mostly guessing from my leaded plug days and digital age reviews,
tan porcelain might be some oil evidence on that side and the grey rims might be a tad to hot a heat range and the timing a tad advanced so hook thermal stain not near the crook. Or could just stand a bit more fuel to make mo power.

Leaded 110 Octane Fuel

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