Stocker Low Compression Approved Fuel.
 

Low compression SBC stocker motor, would like to run lowest Octane approved fuel. What would everyone suggest? 92 unleaded Pump gas is not legal at a Divisional Lucas Oil race ?

6380 STK Steve Teeter.

Re: Stocker Low Compression Approved Fuel.
 

Forgot to add, leaded or unleaded for Low compression.???

6380 STK.

Re: Stocker Low Compression Approved Fuel.
 

First choice VP C-11.2nd Sunoco standard 110. Both are leaded fuels.Pump gas is not legal at a NHRA divisional,nat.open or national event. gsa612

Re: Stocker Low Compression Approved Fuel.
 

Same recommendation. I've tried both on the dyno and saw no discernible difference.

Re: Stocker Low Compression Approved Fuel.
 

Bill,
Is there a jetting or timing difference in the two fuels?

Re: Stocker Low Compression Approved Fuel.
 

Look at
Sunoco 260 GTX Unleaded
VP C10 or VP C20 both Unleaded.
All three are NHRA legal.

D

Re: Stocker Low Compression Approved Fuel.
 

Sunoco tech recommends Sunoco 'Surge' as their best low compression fuel at 105 octane over 260 GTX fuel. It is now on the the approved fuel list. Supposed to have some better qualities than 260GTX.

Re: Stocker Low Compression Approved Fuel.
 

What year,cubic in,comp.ratio is the SBC ?. gsa612

Re: Stocker Low Compression Approved Fuel.
 

When Pete had his 80 305 we dynoed Sunoco110,C12,C11 and even tried C25 ($20+ gal.at the time).The C11 was worth about 5,it liked to be 1 step richer on the sec. rod. over the C12 and the 110.The C25 came around after changing timing, jets,rods,moving the cam.In the end it showed a couple of HP over the C11.Some guys were seeing close to 10 on BBC.On the SBC the minimal gains did not justify the cost.So C11 it was! gsa612.

Re: Stocker Low Compression Approved Fuel.
 

C11 works well, better than the older
Sunoco supreme, have not tried the newer
unleaded fuels, c25 was a tick quicker but
Expensive as stated earlier would only use for class
or heads up.

Re: Stocker Low Compression Approved Fuel.
 

It was at the tail end of the dyno session and we didn't compare any farther than switching from one fuel to the other, so I don't have an answer to that one.

Re: Stocker Low Compression Approved Fuel.
 

Ron, which engine do you run?

Re: Stocker Low Compression Approved Fuel.
 

I ran the 255/350, 295/350, 278/350and now the 1970
lt1 360-325/350

Re: Stocker Low Compression Approved Fuel.
 

Renegade R11 is a good option also.

Re: Stocker Low Compression Approved Fuel.
 

Technical Details 260 GTX
Color: Green
Octane (R+M)/2: 98
Research Octane: 103
Motor Octane: 93
Specific Gravity: 0.762
Weight (lbs/gallon): 6.3
Reid Vapor Pressure (PSI): 4.7
10% Evaporation (°F): 182
50% Evaporation (°F): 220
90% Evaporation (°F): 227
Stoichiometric Air/Fuel Ratio: 14.6
Oxygen (weight%): 0
Ethanol (volume%): 0
H/C Ratio: 1.76
Lower Heating Value (Btu/Gallon): 115800
Lower Heating Value (Btu/Pound): 18240
Dielectric Constant: 1.6
Leaded: No

Re: Stocker Low Compression Approved Fuel.
 

Technical Details Sonoco Surge

Color: Light Yellow
Octane (R+M)/2: 105
Research Octane: 109
Motor Octane: 101
Specific Gravity: 0.714
Weight (lbs/gallon): 5.9
Reid Vapor Pressure (PSI): 8.0
Initial Boiling Point (°F): 90
10% Evaporation (°F): 125
50% Evaporation (°F): 210
90% Evaporation (°F): 225
Final Boiling Point (°F): 250
Stoichiometric Air/Fuel Ratio: 14.9
Oxygen (weight%): 0
Ethanol (volume%): 0
H/C Ratio: 2.09
Lower Heating Value (Btu/Gallon): 111,975
Lower Heating Value (Btu/Pound): 18,650
Dielectric Constant: -0.2
Leaded: Yes

Re: Stocker Low Compression Approved Fuel.
 

Some good info to work with. Ran the new 350 2 barrel combo on pump gas last weekend. 1/8 mile hits only. Divisionals this weekend . Will have C11 in It. Interested in comparing 1/8 performance of 3.50$ gas to 15.00$ race gas. Probably faster on pump gas.

STK. 6380.

Re: Stocker Low Compression Approved Fuel.
 

Call Jason @ Insinger fuels, he will give you the lowdown on the Surge and any other Sunoco fuels, I have been doing some testing with the Surge for them and he has my info and others on the results.
Jason 5706376081

Duane

Re: Stocker Low Compression Approved Fuel.
 

Be careful , Flush your fuel system out with race gas , or you could possibly get bounced at fuel check .

Re: Stocker Low Compression Approved Fuel.
 

An you mix race gas...so long as it done now have ethanol.
Not all tracks carry the same fuel
D

Re: Stocker Low Compression Approved Fuel.
 

Dan, if you decide to try to run that car as an NHRA Stocker, be sure to not mix fuels. That is likely to not pass Fuel Check. I have had problems with the Sunoco I tried to use it for a while. Here in Div 4 (maybe other divisions as well?) they had stopped allowing VP fuel to be sold at the track. I have been able to buy it here locally. I figured it would be safer to buy Sunoco at the track, than to haul 15 gals of fuel while towing.

Lost qualifying rounds, due to failing fuel check. The sample the techs had were gotten at the track! Same place I bought mine! Maybe Sunoco has their act together better now, so their fuel always checks the same. I now avoid it like the plague.
A tech guy I know told me they found not even every drum checked the same. Different dates did not always check the same. He said they loosened their checking tolerances a little. Guess if your a sponsor......

I was probably not supposed to have told this. It is true.

Re: Stocker Low Compression Approved Fuel.
 

Wow...I like the Sunoco 260GTX..not everyone carries it.
Does that mean I need to carry my own fuel?
Then stock up at home?
This is crazy...
It is one of the main reasons not moving up to Stock.
Fortunately the Association races are more relaxed.

How do you drain the fuel safely!

D

Re: Stocker Low Compression Approved Fuel.
 

My SS car has a square aluminum fuel cel, with a threaded bung welded in the bottom. I have a hole in the floor under it. I just unscrew that plug to drain it.
If SUNOCO has fixed their stuff, passing fuel check with it should be no problem.
My issues with it was the first year. I have no further experience with it. Just have not used it since. If your having no problems with it, that is great.

Re: Stocker Low Compression Approved Fuel.
 

So you use VP exclusively.
Any benefit with one over the other?
or
Do you use another manufacture blend?

D

Re: Stocker Low Compression Approved Fuel.
 

Sorry. I clicked again, when it appeared nothing was happening. This was a duplicate of above. I'm a dummy. Bet nobody ever noticed that.
If I knew how, I would delete it.