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what fuel to use ?

 
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Fri Jul 11, 2008 4:57 pm    Post subject: what fuel to use ? Reply with quote

well, ive decided to go ahead and install my nitrous kit. its a NOS Cheater plate system. it will have an independent fuel system using a 1 gal cel in front. my question is.......... what fuel should i use ? the motor is running on pump gas but i was thinking of using race fuel for the nitrous.
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af2 wrote:
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af2
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1933 Willys Coupe

PostPosted: Fri Jul 11, 2008 5:51 pm    Post subject: Re: what fuel to use ? Reply with quote

10sec.et wrote:
1 gal cel in front. my question is.......... what fuel should i use ? the motor is running on pump gas but i was thinking of using race fuel for the nitrous.


Since I have only done 1 Banshee runnin juice at 500 cc. I can say you are going to need Sunoco Standard at 110 octane. That alone stopped him from melting aluminum products! Including the head gaskets I made from aluminum and brinelled to conform.
I only know from one race quad I worked with and don't have a clue with everyday stuff. It has to be close though! Very Happy
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Fri Jul 11, 2008 10:01 pm    Post subject: Re: what fuel to use ? Reply with quote

af2 wrote:
I can say you are going to need Sunoco Standard at 110 octane.


is that the purple fuel ? i have five gallons of that. whats shelf life on that stuff ? i think the fuel that i have is about a year old.

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Paul P
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PostPosted: Sat Jul 12, 2008 5:32 am    Post subject: Reply with quote

That will work. The purple stuff is VP-110 if it is VP gas.
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jimmoffitt
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1932 Austin Maxi

PostPosted: Sat Jul 12, 2008 8:26 am    Post subject: Reply with quote

these boys are telling it strait ,i run a lot of nitrous and the high octane will save your motor as long as you run the correct fuel pressure. i start off about a pound or two to the high side and reduce it as needed by plug readings. retard the timing 2 deg. for each 50 shot and your in buisiness.
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clay
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1972 Chevrolet Nova

PostPosted: Sat Jul 12, 2008 9:18 am    Post subject: Reply with quote

To me it depends on how much the motor itself is on the edge. If it is a 9 - 1 motor, I would run up to a 150 shot on pump gas. 10 - 1 maybe no more than a 100 shot on pump gas. I use the same timing retard Jimmoffitt said, and maybe a degree or two more if I'm running on pump gas. If you have a ragged edge pump gas motor already, then nothing. I don't have much experience above 150, but I would absolutely run race fuel of some sort above that. Clay
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sat Jul 12, 2008 10:29 am    Post subject: Reply with quote

thanks for the help guys thumbsup . the compression should be a little over 10:1. i know i should know exactly how much compression i have but when i installed the E-brock heads, i didnt CC them to re-calculate compression. the old heads were cast iron J castings with 89 CC chambers. the motor at that time had about 9.4:1 compression. the E-brock heads are supposed to be 77 CC.

the fuel is VP 110. i didnt remember until Paul said it. is that stuff still any good after sitting in the jug for a year or so ?

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Paul P
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PostPosted: Sat Jul 12, 2008 3:24 pm    Post subject: Reply with quote

Race gas is more tolerant to sitting than pump gas I would think if it was a good sealed container and kept out of the sunlight it would still be ok. Temperature cycles are a factor too.
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2001 Focus 2.0 Zetec
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af2
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PostPosted: Sat Jul 12, 2008 8:08 pm    Post subject: Reply with quote

Paul P wrote:
Race gas is more tolerant to sitting than pump gas I would think if it was a good sealed container and kept out of the sunlight it would still be ok. Temperature cycles are a factor too.



Very true! no oxygenated fuel!!!!
With the new better VP look out!!!!!!!!!!
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Knarley Darley
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PostPosted: Sun Jul 13, 2008 12:13 am    Post subject: Reply with quote

When I just redid my NHRA license I used gas that was 3 years old, however it was in a sealed container that was full(not much air space at the top of the can). Speaking of oxyginated fuel. I bought a fresh pale of VP Q-16 for the last 2 passes and the car went 158 mph hitting the limiter 200 feet from the end. Your VP should be fine.
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af2
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1933 Willys Coupe

PostPosted: Sun Jul 13, 2008 7:59 pm    Post subject: Reply with quote

The oxy fuel will never last in the container. But is good stuff!
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wagon train
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1983 Mercury Capri

PostPosted: Wed Jul 16, 2008 9:29 am    Post subject: Reply with quote

Rule of thumb on fuel unsealed container loses about 3 octane numbers per month it has been sitting.
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10sec.et
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PostPosted: Wed Jul 16, 2008 11:32 pm    Post subject: Reply with quote

wagon train wrote:
Rule of thumb on fuel unsealed container loses about 3 octane numbers per month it has been sitting.


by "sealed" i assume you mean air tight. my fuel has been in a jug but the little vent cap is missing and just has a rag tied around it. probably should have given that little tid-bit of info earlier on Embarassed . if what you say is true (im not doubting your wisdom, just rationalizing) then im not really sure i want to trust what i have with the nitrous. i may just dump it in and make a few more motor passes with it.

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wagon train
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1983 Mercury Capri

PostPosted: Fri Jul 18, 2008 6:54 pm    Post subject: Reply with quote

Sealed air tight,I think could only be in a drum.
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