What fuel for my combo ?

nuclearcobra October 14th 2011, 10:01 am

Im wondering if i can get away with a 110/93 half and half mix vs. straight 110 ? its a 472'' with scj diamond flat tops and scj heads, the piston was about .006 in the hole, the cam is a solid flat tappit 260-268 @.050 637-648 lift. Randy M said before that 12to1 is to low for straight 110 but to high for 93 so it got me thinking maybe i can mix it.

rmcomprandy October 14th 2011, 10:34 am

nuclearcobra wrote:Im wondering if i can get away with a 110/93 half and half mix vs. straight 110 ? its a 472'' with scj diamond flat tops and scj heads, the piston was about .006 in the hole, the cam is a solid flat tappit 260-268 @.050 637-648 lift. Randy M said before that 12to1 is to low for straight 110 but to high for 93 so it got me thinking maybe i can mix it.

M+R divided by 2 ... 100 to 104 octane gasoline.

nuclearcobra October 14th 2011, 11:34 am

Thanks Randy , i had a chart years ago that gave all the diffrent octanes when mixing fuels but have never been able to find it Rolling Eyes

figures one of those things i put away so i would never misplace it again Mad

Damn i hate good hiding spots they work everytime Embarassed

nuclearcobra October 14th 2011, 12:21 pm

Found it on wallace racing calculaters 50/50 mix of 110 and 93 =101.5 octane

nuclearcobra October 14th 2011, 12:24 pm

rmcomprandy wrote:
nuclearcobra wrote:Im wondering if i can get away with a 110/93 half and half mix vs. straight 110 ? its a 472'' with scj diamond flat tops and scj heads, the piston was about .006 in the hole, the cam is a solid flat tappit 260-268 @.050 637-648 lift. Randy M said before that 12to1 is to low for straight 110 but to high for 93 so it got me thinking maybe i can mix it.

M+R divided by 2 ... 100 to 104 octane gasoline.

So 100 to 104 is what i should use for my combo ?

rmcomprandy October 14th 2011, 3:47 pm

nuclearcobra wrote:Found it on wallace racing calculaters 50/50 mix of 110 and 93 =101.5 octane

That is SOooo wrong ... it is presuming both fuels are leaded fuels of a certain amount.
It could be anywhere from 98 to 105 depending upon how much tetraethelead is within each one's chemical make-up or whether or not lead is present at all.

Appropriate Gasoline:

Leaded?
VP "Motorsport 103"
VP C11
Turbo Blue

Leaded, Oygenated ?
VP "Motorsport 109E" (with Ethanol and really heavy specific gravity)
VP MRX-01
VP VPR
VP U4.4

Unleaded with Ethanol Oxygenate ? (street legal and catalytic converter friendly)
VP 100 (aka Street Blaze 100)

Unleaded ?
VP C10
Sunoco 100
Rocket Racing unleaded (Union 76 unleaded)

56Tbird October 14th 2011, 7:38 pm

Put it on methanol and be done with it!!

jc10000rpm October 14th 2011, 8:14 pm

could be a good candidate for e-85 if available in your area,

Tennessee Bullitt October 14th 2011, 8:46 pm

Randy, My A-headded deal gonna be around 12:1 how would C12 work. I am gonna spray nitrous and was thinking running a seperate cell with c16 for a big shot. Does the cam play a factor for fuel selection? Didn't mean to hijack the thread.

cool40 October 14th 2011, 9:31 pm

56Tbird wrote:Put it on methanol and be done with it!!

x2

rmcomprandy October 14th 2011, 9:55 pm

Tennessee Bullitt wrote:Randy, My A-headded deal gonna be around 12:1 how would C12 work. I am gonna spray nitrous and was thinking running a seperate cell with c16 for a big shot. Does the cam play a factor for fuel selection? Didn't mean to hijack the thread.

C12 is probably one of the most used leaded racing fuels ever, LOL.
It probably has a lot to do with cost and being SPEC fuel for a lot of organizations..
Personally, I would look into using VP113 oxygenated fuel which weighs almost the same and it will make more power at your 12/1 compression ratio. You won't need to use something different for nitrous.

Tennessee Bullitt October 14th 2011, 10:12 pm

rmcomprandy wrote:
Tennessee Bullitt wrote:Randy, My A-headded deal gonna be around 12:1 how would C12 work. I am gonna spray nitrous and was thinking running a seperate cell with c16 for a big shot. Does the cam play a factor for fuel selection? Didn't mean to hijack the thread.

C12 is probably one of the most used leaded racing fuels ever, LOL.
It probably has a lot to do with cost and being SPEC fuel for a lot of organizations..
Personally, I would look into using VP113 oxygenated fuel which weighs almost the same and it will make more power at your 12/1 compression ratio. You won't need to use something different for nitrous.

I am looking up to a 400 shot. Does that change things?

Lem Evans October 14th 2011, 10:16 pm

Tennessee Bullitt wrote:
rmcomprandy wrote:
Tennessee Bullitt wrote:Randy, My A-headded deal gonna be around 12:1 how would C12 work. I am gonna spray nitrous and was thinking running a seperate cell with c16 for a big shot. Does the cam play a factor for fuel selection? Didn't mean to hijack the thread.

C12 is probably one of the most used leaded racing fuels ever, LOL.
It probably has a lot to do with cost and being SPEC fuel for a lot of organizations..
Personally, I would look into using VP113 oxygenated fuel which weighs almost the same and it will make more power at your 12/1 compression ratio. You won't need to use something different for nitrous.

I am looking up to a 400 shot. Does that change things?

with what comp. ratio and with how much timing retard when the spray is on?

richter69 October 15th 2011, 2:14 am

cool40 wrote:
56Tbird wrote:Put it on methanol and be done with it!!
x2

x3

dfree383 October 15th 2011, 2:16 am

Alky's for Drinkin', Gas is for Racin'........... pirat

rmcomprandy October 15th 2011, 1:13 pm

Tennessee Bullitt wrote:
rmcomprandy wrote:
Tennessee Bullitt wrote:Randy, My A-headded deal gonna be around 12:1 how would C12 work. I am gonna spray nitrous and was thinking running a seperate cell with c16 for a big shot. Does the cam play a factor for fuel selection? Didn't mean to hijack the thread.

C12 is probably one of the most used leaded racing fuels ever, LOL.
It probably has a lot to do with cost and being SPEC fuel for a lot of organizations..
Personally, I would look into using VP113 oxygenated fuel which weighs almost the same and it will make more power at your 12/1 compression ratio. You won't need to use something different for nitrous.

I am looking up to a 400 shot. Does that change things?

The HP size of the nitrous system doesn't make any difference as long as the MIXTURE and ignition timing is correct.

Tennessee Bullitt October 15th 2011, 7:06 pm

Lem Evans wrote:
Tennessee Bullitt wrote:
rmcomprandy wrote:
Tennessee Bullitt wrote:Randy, My A-headded deal gonna be around 12:1 how would C12 work. I am gonna spray nitrous and was thinking running a seperate cell with c16 for a big shot. Does the cam play a factor for fuel selection? Didn't mean to hijack the thread.

C12 is probably one of the most used leaded racing fuels ever, LOL.
It probably has a lot to do with cost and being SPEC fuel for a lot of organizations..
Personally, I would look into using VP113 oxygenated fuel which weighs almost the same and it will make more power at your 12/1 compression ratio. You won't need to use something different for nitrous.

I am looking up to a 400 shot. Does that change things?
with what comp. ratio and with how much timing retard when the spray is on?

Around 12:1 and what ever timing is needed to be taken out. I discussed with Bob that I am goning to run the MSD power grid setup for ignition and the timing system. I thought about doing around 13:1 but I think 12:1 will give me more of a window to be safe.

nuclearcobra October 18th 2011, 2:35 pm

56Tbird wrote:Put it on methanol and be done with it!!

You guys are wrong it runs like crap on alky, plus the two gallons of vodka i dumped in it was expensive Shocked

Tennessee Bullitt October 18th 2011, 3:45 pm

nuclearcobra wrote:
56Tbird wrote:Put it on methanol and be done with it!!
You guys are wrong it runs like crap on alky, plus the two gallons of vodka i dumped in it was expensive

I have to agree with you there.^^^^^^^^^^^^^^^^^^

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