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Pushrod Dinosaur
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1,006 Posts
Discussion Starter · #1 ·
OK, i understand you add 3 degrees timing. And you told me to add 3-4 gallons of 100 octane to a 1/4 tank of 93. Do you know what octane the additional 3 degrees requires?? The reason I ask is this. According to the charts at this site: http://www.76.com/cgi-bin/b2cpt01/s...sk=null&Site=76&oid=13571&catoid=-8318#COM100 Scroll towards bottom.....

If I use a 1:1 ratio, the effective octane is 96.5.

If I use a 2:1 ratio (twice as much 93) the octane drops to 95.3

If I use a 1:2 ratio (twice as much 100) the octane goes to 97.7

The differences in the price of a 15 gallon fill are:

1:1 = (1.70 x 7.5) + (4.50 x 7.5) = 46.00

2:1 = (1.70 x 10) + (4.50 x 5) =39.50

1:2 = (1.70 x 5) + (4.50 x 10)= 53.50

So, if 95.3 octane is sufficient, i can save a little. I'm using the 1:1 ratio right now. not sure if a 1.2 drop in octane would cause any detonation probs. Any thoughts????

gary
 

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Pushrod Dinosaur
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1,006 Posts
Discussion Starter · #3 ·
ttt. Rick, any comments on this??

Matt: i know............trying to save 20 bucks with this car is kinda stupid huh.......


gary
 

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Senior Member
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400 Posts
Hey Gary, I know the ratio of 1/4 of 93 to 3-4has always worked fine. I would be afraid to do any less. also read my post that aI will be putting up on the winter gas.

Rick
 

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Pushrod Dinosaur
Joined
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1,006 Posts
Discussion Starter · #5 ·
AmazonRacing said:
Hey Gary, I know the ratio of 1/4 of 93 to 3-4has always worked fine. I would be afraid to do any less. also read my post that aI will be putting up on the winter gas.

Rick
that's cool. how much is left in the tank when it reads 1/4??? the gauge doesn't seem to move evenly. I think your formula makes it 1:1 but just wondering what it is exactly. I guess i have too much free time on my hands..................LOL Thanks.

gary
 
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