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Topic: Sunoco CAM2 fuel

in Forum: C4 Fuel, Emission Control, and Exhaust Systems


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Sunoco CAM2 fuel (1/4)
 6/25/14 8:36pm
wingnut
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Naples, FL - USA

Vette(s):
1984 C4 Mild mods.85 fuelpump,Accel ignition, TCI, shiftkit, ramAir, Boshplat plugs, duels straight, VP 106 fuel mix, 1990 wheels,, Silver/Gray 1996 LT 4 Stock muffler eliminators Torch Red ZR1 Wheels


Joined: 6/19/2011
Posts: 46

Question Hey guys has anyone used Sunoco's CAM 2 fuel ?? I picked up 5 gals $75.00 I guess it has a higher octane than the 93 from the pump. I have an LT4 it has a 10.8 to 1 comp. I have put about 2 gals in with my 93 oct. car runs cooler and Seems to run stronger. ANY coments ??Cool 

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Re: Sunoco CAM2 fuel (2/4)
 6/25/14 9:37pm
396c4
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Joined: 12/7/2011
Posts: 219

Higher octane "rating" means reduced tendency to knock and it's just a number that measures that tendency. I've spoken to techs who should understand that but think you can buy octane like you by methanol (which by the way has a much higher octane number). Higher octane rating means it burns slower and "explodes" at higher pressure so, you should make the most power at the lowest octane that doesn't knock with your compression and timing curve (setup). 

Throw spark advance at it and you complicate the process but the logic is the same. There's a little advance left in the factory curve to account for all the conceivable locations and altitudes, but GM has about maxed out the curve for low test gas. They have to maximize the gas mileage. So if you're bone stock, and unless the manufacturer determined high test is required, you're likely wasting money and power going to higher octane. Unless you know it's knocking and the ECM is retarding the timing to compensate, fight the temptation to give her a treat. That said, just because the pump is marked with an octane number, doesn't mean they are all the same. We've all had bad gas that knocks. Up north it's more common when they switch the blend seasonally. Racing gas is more consistent that way and makes the small amount used worth the expense.

Also, I don't think you will find the octane number changes linearly with the mix. A little contamination of good gas will have drastic affects and pouring expensive high octane into lesser quality will not overcome much of the knock tendency, all the light ends of the fuel that cause it will "go off" just the same, they don't get blended away. That seems contrary to what you seemed to find but spending the money has that tendency...only one place to find out...track test.


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Re: Sunoco CAM2 fuel (3/4)
 8/30/14 6:54am
REDVETTE85
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NORTON, OH - USA

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1985 C4 red, 1985 C4 Black and dark gray


Joined: 7/9/2012
Posts: 111

AMEN 396     adding 2 gal of 102 or whatever to a tank of 93 and what do ya get  93  I had a chemical engineer tell me that in some cases it can even lower  the rating  after I melted holes thru pistons mixing nitromethane and VP-C4
Re: Sunoco CAM2 fuel (4/4)
 10/1/14 8:10pm
396c4
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Joined: 12/7/2011
Posts: 219

There is another thread to this topic in the "fuels and emissions" where Adam's Apple covers much the same ground.

The one time to re-consider your fuel choice is putting it away for the winter. Up here, only the highest octane is without any ethanol (marked right on the pump). "Carb defender" is on the market to help reduce the effects but articles in http://www.powerperformancenews.com/ suggest fresh gas with ethanol (ie driving it) is not a problem. Leaving it sit where the ethanol attracts the water and causes corrosion is. Suggestion is to fill it to the neck to minimize the available area or drain the tank.

I'm not a fan of either since gas breaks down over time and I don't really want a tank full stale gas in the spring. Draining it entirely leaves things entirely exposed too. So, my plan is to add fresh gas without ethanol when it gets warmed up regularly over the winter, trying to freshly pickle it each time.


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