We are fortunate to have locally a Sunoco Cam 2 pump with 110 octane leaded fuel. It has been there for better than thirty years. They sell alot because I called Sunoco and they actually sent a tech out to check the fuel. It was exactly as advertised. Is it as good to mic this with 93 pump gas as it is using 100LL aviation fuel? Any problems in using the Cam 2 in our vintage Corvettes and other cars from the era?
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Re: Opinion on Sunoco Cam 2 race fuel
I recently put a tankful of 110 leaded in my '67. I don't want that alcohol in the fuel system, eating up the plating inside my carb and screwing up the sending unit in the tank. Hot starts are easier, acceleration is faster and it doesn't stall out while idling. A real deal at $7.17 a gallon!
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Re: Opinion on Sunoco Cam 2 race fuel
There's a local Haffners in Plaistow, NH that sells Cam 2 110 leaded for all the drag racers heading to New England Dragway. $7.50 / gal. It's purple and smells awesome.
I mix a gallon or two per tankful of 93. It allows me to run full advance for my '70 LS5 and '69 L71.1969 Riverside Gold Coupe, L71, 14,000 miles. Top Flight, 2 Star Bowtie.Comment
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Re: Opinion on Sunoco Cam 2 race fuel
Ours is $8.00 per gallon. I mix a five gallon can in a tank of 93 in my 67 390. Car runs great. I also have a 63 Dodge super stock max wedge. It is expensive but that gets the tank filled with the Cam 2
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Re: Opinion on Sunoco Cam 2 race fuel
GETTING THE BEST PERFORMANCE OUT OF YOUR CAR WITH THE RIGHT OCTANE would be my guess.
But with dish pistons it really doesn't matter, you can burn any thing you want.
The octane problem is for the high compression engines!!!!!
DOMComment
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Re: Opinion on Sunoco Cam 2 race fuel
Dom,
I've never owned a low compression or 'dished piston' V8 in my life. Please give it a rest.
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Re: Opinion on Sunoco Cam 2 race fuel
I used a mix of 5 gal cam2 to 7 gal 93 from 1997 to this year. It just got too expensive so I switched to 100% 100LL which believe it or not was cheaper. The car ran fine on the mix and I never had a problem however, I think it runs better on the 100LL.Comment
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Re: Opinion on Sunoco Cam 2 race fuel
John, I heard a similar answer from my brother, a master mechanic and engine builder for the last 45 years. He said the max wedge for example, which is a true race engine will actually start easier on the 93 pump gas or the 100LL rather than the Cam 2. That motor is always difficult to start, but now I am thinking that the straight Cam 2 is not the best option. I will have to get his technical explanation again as I would probably not explain it properly.Comment
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Re: Opinion on Sunoco Cam 2 race fuel
I tried straight 93 in the car when I first got it. It was VERY hard starting and would diesel at shutoff. That is why I went to the mix.Comment
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Re: Opinion on Sunoco Cam 2 race fuel
I too, like the idea of using a mix of 110LL and 90 no lead. Actually, the idle come up 200 RPM. Strange?Comment
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Re: Opinion on Sunoco Cam 2 race fuel
Michael,
If your 1973 has a stock engine in it then you DO own a low compression engine..
The compression ratio is determined by amount of air squeezed between the top of the piston and head.
In the last part of 1971 GM had to conform with Government specs and in 1972 ALL chevrolet engines were low compression.
That was a smog thing but it was also getting us ready for the low octane fuel.
I was there as a mechanic and saw it happen.
The days of getting something off the showroom floor were over for a long time.
GET IT NOW?
DOMComment
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Re: Opinion on Sunoco Cam 2 race fuel
Dom, Please stop, you're approaching 'troll' status.
I do not have the stock low compression engine in my '73. It went bang 20+ years ago and was replaced with an engine that roughly equals what GM produced in the early 70s w approx. 11:1 compression. Runs great on 91-93 E10. Always has.
My comments on this never ending subject of octane have no real connection to this particular car- they come primarily from professional experience that easily dispels the myths and misunderstandings. You might choose to believe them yourself, but please accept that not everyone agrees. The badgering is not appreciated. Thanks.Comment
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Re: Opinion on Sunoco Cam 2 race fuel
Michael,
I guess what I do not understand is that when a member says his or her car runs better on higher octane fuel you seem not to believe them.
Also as a profecional myself, I HAVE experianced the results of using the fuel the engineers that designed the engines recomend.
One area that seems to get avoided are the combustion pressures that each different fuel produces when it explodes in the combustion chamber?
The more push on the piston, the more HP produced.
Not all things explode at the same rate and pressure.
one reason the timing is advanced on 11:1 compression is that the higher octane fuel takes longer to burn, and that's the reason the timing is retarded when using a lower octane fule (burns faster).
This was proven by champion spark plugs in a demonstration proving the burn times of octane. Again their test was thru 50' glass tubes ignighting low& high octane fuels at the same time and having the lower octane beat the higher octane to the end every time.
Detonation/pre-ignition CAN be produced with high & low octane within the chamber by timing to the advance.
Now when guys cheated at the races they used nitro in their fuel, they increased the downward pressure on the top of the piston.
Example would be increasing the combustion pressure from 1700 psi to 2400 psi on the piston that produced more push that = HP.
Some choose to believe this and have reeped the benifits, then there are some that don't care as long as the engine gets them from A to B.
And yes, I do hold a Gov licence in mechanics where fuel usage and octane is critical and a cause of engine failure.
I'm done with this because I have seen the proof, and along with some others, I don't think they would lie about results.
DOMComment
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Re: Opinion on Sunoco Cam 2 race fuel
My 67/435 runs much better on c-12(112)than pump gas.Anyone that says pump gas is just as good must have alot better pump gas than we have in this area.(upstate NY)
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