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Old 10-01-2012, 06:01 PM   #36
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Quote:
Originally Posted by 2300turboford
Even with a aluminum head. U cant pull off 11.0.1 on 87.
Umm not sure what you mean, are you saying that compression drops when you use low octane?
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Old 10-01-2012, 06:06 PM   #37
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No if u have 10.5.1 or higher with a aluminum head u have to run better gas or it will knock and ping
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Old 10-01-2012, 06:08 PM   #38
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Quote:
Originally Posted by 2300turboford
No if u have 10.5.1 or higher with a aluminum head u have to run better gas or it will knock and ping
O gotcha.

They have the knock sensors that do just that, they sense knock, and they pull timing to prevent the knock and detonation. So really it doesn't perform optimally on 87, or anything less than 91 really
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Old 10-01-2012, 06:10 PM   #39
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Originally Posted by GrabberBlue5.0

O gotcha.

They have the knock sensors that do just that, they sense knock, and they pull timing to prevent the knock and detonation. So really it doesn't perform optimally on 87, or anything less than 91 really
Ohh i forgot about those lol. I have old techlnolagy
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Old 10-01-2012, 06:13 PM   #40
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Originally Posted by GrabberBlue5.0

Yea, it all actually very very complex, seriously. That's the beginning, the way I see it, I'm just a noob too haha

---------- Post added at 06:54 PM ---------- Previous post was at 06:53 PM ----------



It has an 11.0:1 cr (compression ratio) earlier I said 11.5:1 which is incorrect sorry
Incorrect info rrrrrrrrraaaaaaa, it's all good jaja.
But now I gotta ask what does the 1 mean in a 11:1 ratio?
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Old 10-01-2012, 06:25 PM   #41
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Quote:
Originally Posted by Butch

Incorrect info rrrrrrrrraaaaaaa, it's all good jaja.
But now I gotta ask what does the 1 mean in a 11:1 ratio?
1 is representative of the size of a cylinder and 11 is how many times it is compressed to.

Example: an individual cylinder is 1100cc at BDC, then at TDC the combustion chamber is only 100cc. The air and fuel is compressed into an area 11 times smaller than its maximum capacity before it is ignited to creat combustion
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Old 10-01-2012, 06:57 PM   #42
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Quote:
Originally Posted by GrabberBlue5.0

1 is representative of the size of a cylinder and 11 is how many times it is compressed to.

Example: an individual cylinder is 1100cc at BDC, then at TDC the combustion chamber is only 100cc. The air and fuel is compressed into an area 11 times smaller than its maximum capacity before it is ignited to creat combustion
Oooohhh now I know. Awesome
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Old 10-01-2012, 07:07 PM   #43
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Thanks Grabber, you explained better than I could ever do.
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Old 10-01-2012, 07:20 PM   #44
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Higher compression ratio also means greater thermal efficiency in Otto cycle engines...just throwin in some more nuggets of juicy goodness. Fluids 1 FTW!
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Old 10-01-2012, 07:47 PM   #45
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Thanks Grabber, you explained better than I could ever do.
Yea hopefully it made sense. by no means do I know it all lol, just tried to explain the best that I could.

Anyways... too much brain power for one day, time to sleep
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Old 10-01-2012, 07:54 PM   #46
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Yea hopefully it made sense. by no means do I know it all lol, just tried to explain the best that I could.

Anyways... too much brain power for one day, time to sleep
Lol, out!
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Old 10-01-2012, 07:55 PM   #47
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gotta be honest, have a thing for funny cats lol
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Old 10-01-2012, 07:58 PM   #48
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gotta be honest, have a thing for funny cats lol
Ha! Well, at least you acknowledge your problem.
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Old 10-01-2012, 08:18 PM   #49
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Quote:
Originally Posted by GrabberBlue5.0

Yea hopefully it made sense. by no means do I know it all lol, just tried to explain the best that I could.

Anyways... too much brain power for one day, time to sleep
Ja,
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Old 10-01-2012, 08:18 PM   #50
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I thought i read somewhere that the car pulls timing based on the fuel. So you make like 398hp on 87oct, 410hp on 91oct, and 420hp on 93oct (13) models. So if you want the most hp you run the higest octane anyways.
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Old 10-01-2012, 08:19 PM   #51
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Originally Posted by GrabberBlue5.0
gotta be honest, have a thing for funny cats lol
The cat at work will eat with his paws, he'll pick up the food with a claw and bring it to his mouth
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Old 10-01-2012, 11:00 PM   #52
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Quote:
Originally Posted by GrabberBlue5.0

You could give a 16 week college class on this subject but I'll try to sum it up quickly

Combustion relies on a combination of pressure and heat, the higher the heat, the less pressure that is needed and the higher the pressure the less heat is required. A compression ratio is basically a ratio of how much the air/fuel mixture is compressed. 11.5:1 (the coyote) means that the piston compresses the air/fuel in the cylinder to 11.5 times smaller at TDC than it is at BDC, also meaning the air/fuel mixture is now 11.5 times more dense. A lower octane fuel will burn at lower temp/pressure than a higher octane fuel. Therefore it's required to use fuel with a higher combustion temp/pressure with higher compression.

Timing has to do with when the spark comes from the spark plug and is a whole different conversation lol
My understanding of this is, low octane fuel burns faster and can ignite on the up stroke before top dead center, like a diesel. This causes damage to the pistons (I don't know why). I'm no expert on this, here is an interesting article: http://www.kb-silvolite.com/features...n=read&F_id=46

I think we can run low octane fuel in our cars because the cam duration can be changed on-the-fly. Via VVTI. Thus changing the *valve* timing of the intake and exhaust valves. So, when you're running low octane, you really don't have 11:1 compression ratio.

My .$.02. Maybe I'm full of it.
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Old 10-01-2012, 11:02 PM   #53
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This causes damage to the pistons (I don't know why).
It causes damage because the entire force of the rotating assembly is pushing the piston up, while the "explosion" is trying to push it down. Usually the piston gives, or the rings give out. This is generally catastrophic regardless.

Sure you can run lower octane, but why put the "bare minimum" in a $35k car? You're pinching pennies in the wrong area IMO.
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Old 10-01-2012, 11:06 PM   #54
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Quote:
Originally Posted by InfinibandGT

My understanding of this is, low octane fuel burns faster and can ignite on the up stroke before top dead center, like a diesel. This causes damage to the pistons (I don't know why). I'm no expert on this, here is an interesting article: http://www.kb-silvolite.com/features...n=read&F_id=46

I think we can run low octane fuel in our cars because the cam duration can be changed on-the-fly. Via VVTI. Thus changing the *valve* timing of the intake and exhaust valves. So, when you're running low octane, you really don't have 11:1 compression ratio.

My .$.02. Maybe I'm full of it.
Changing timing for lower octane, tuner status. Like a hand held =}

---------- Post added at 10:06 PM ---------- Previous post was at 10:06 PM ----------

Quote:
Originally Posted by Napoleon85

It causes damage because the entire force of the rotating assembly is pushing the piston up, while the "explosion" is trying to push it down. Usually the piston gives, or the rings give out. This is generally catastrophic regardless.

Sure you can run lower octane, but why put the "bare minimum" in a $35k car? You're pinching pennies in the wrong area IMO.
+1, better throw pennies than pinch em
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Old 10-01-2012, 11:09 PM   #55
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Quote:
Originally Posted by Napoleon85

It causes damage because the entire force of the rotating assembly is pushing the piston up, while the "explosion" is trying to push it down. Usually the piston gives, or the rings give out. This is generally catastrophic regardless.

Sure you can run lower octane, but why put the "bare minimum" in a $35k car? You're pinching pennies in the wrong area IMO.
Agreed!

---------- Post added at 09:09 PM ---------- Previous post was at 09:08 PM ----------

Quote:
Originally Posted by InfinibandGT

Agreed!
And I don't run less than 91.
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Old 10-01-2012, 11:19 PM   #56
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Agreed!

---------- Post added at 09:09 PM ---------- Previous post was at 09:08 PM ----------



And I don't run less than 91.
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Old 10-01-2012, 11:21 PM   #57
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I haven't even got thru the second page and wtf! Gayblue you need to find a better life!!!!!!!!!!
No problem here. I'm an idiot when it comes to these engines. I'm learning.
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Old 10-01-2012, 11:29 PM   #58
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No problem here. I'm an idiot when it comes to these engines. I'm learning.
One thing I'm not an idiot about. I don't buy gas with ethanol that is here in California. It runs like ****.

Not in Shell and Chevron gas. Valero, absolutely. I don't buy that crap.
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Old 10-01-2012, 11:39 PM   #59
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Note the perverted names and the upside-down stickers. It's for real, through. It's there to buy.

You guys on the east coast are probably laughing
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Old 10-01-2012, 11:47 PM   #60
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Quote:
Originally Posted by Napoleon85

It causes damage because the entire force of the rotating assembly is pushing the piston up, while the "explosion" is trying to push it down. Usually the piston gives, or the rings give out. This is generally catastrophic regardless.

Sure you can run lower octane, but why put the "bare minimum" in a $35k car? You're pinching pennies in the wrong area IMO.
+1
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Old 10-02-2012, 12:19 AM   #61
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5.59? Dayum. How much is 100?
Sweetest pump ever.

---------- Post added at 11:18 PM ---------- Previous post was at 11:15 PM ----------

Quote:
Originally Posted by InfinibandGT

One thing I'm not an idiot about. I don't buy gas with ethanol that is here in California. It runs like ****.

Not in Shell and Chevron gas. Valero, absolutely. I don't buy that crap.
Your chevron doesn't have ethanol? Down here's its up to 10%

---------- Post added at 11:19 PM ---------- Previous post was at 11:18 PM ----------

Quote:
Originally Posted by Charged13
I haven't even got thru the second page and wtf! Gayblue you need to find a better life!!!!!!!!!!
Whoa whoa whoa, where is this gayblue you speak of?
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Old 10-02-2012, 12:35 AM   #62
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Man! I wish they had those options in Indiana! I'd be buying 94 every time. Our racing gas here is 110 octane. That's too hot and will burn up your cats. 94 is just right, gives you a little room for "bad gas".
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Old 10-02-2012, 12:38 AM   #63
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Man! I wish they had those options in Indiana! I'd be buying 94 every time. Our racing gas here is 110 octane. That's too hot and will burn up your cats. 94 is just right, gives you a little room for "bad gas".
Cats? What are those? ;]
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Old 10-02-2012, 12:53 AM   #64
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Cats? What are those? ;]
Catalytic converters

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Old 10-02-2012, 12:54 AM   #65
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Jaja I know man just yanking your chain.
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Old 10-02-2012, 12:55 AM   #66
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Jaja I know man just yanking your chain.
Ha! I was wondering but I'm gettin' sleepy
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Old 10-02-2012, 12:58 AM   #67
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Ha! I was wondering but I'm gettin' sleepy
Time to shut er down sir, same here but darn over haulin won't let me jaja
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Old 10-02-2012, 01:04 AM   #68
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5.59? Dayum. How much is 100?
Sweetest pump ever.

---------- Post added at 11:18 PM ---------- Previous post was at 11:15 PM ----------



Your chevron doesn't have ethanol? Down here's its up to 10%

---------- Post added at 11:19 PM ---------- Previous post was at 11:18 PM ----------



Whoa whoa whoa, where is this gayblue you speak of?
I'm not clear on that myself; gayblue. Im not sure this is the right place to discuss this. If gay wants to be blue or blue wants to be gay. I don't give a ****.

The gas ain't cheap here and there is an oil refinery in my back yard.

I'll post a pic with the pump price for the 100. Interestingly enough, there is a separate hose for the 100 octane.
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Old 10-02-2012, 01:11 AM   #69
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I'm not clear on that myself; gayblue. Im not sure this is the right place to discuss this. If gay wants to be blue or blue wants to be gay. I don't give a ****.

The gas ain't cheap here and there is an oil refinery in my back yard.

I'll post a pic with the pump price for the 100. Interestingly enough, there is a separate hose for the 100 octane.
Jaja right sir.
Dude the fuels should be cheaper then those chicki bastards,
That is too cool, separate hose for the top fuel nice.
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Old 10-02-2012, 02:19 AM   #70
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5.59? Dayum. How much is 100?
Sweetest pump ever.

---------- Post added at 11:18 PM ---------- Previous post was at 11:15 PM ----------



Your chevron doesn't have ethanol? Down here's its up to 10%

Chevron is good here. I'm not telling you literally where I live. Like, not 1 mile from their headquarters. Not like San Ramon. Don't come here to protest.

Valero, here has the ethanol. Like other people are saying, it's random and depends on your state.

I buy from Shell first, then Chevron. The racing **** I posted isn't subject to state law. I buy it sometimes, nothing above 94, otherwise a waste for me. I have a 91 tune, maybe my imagination, 94 runs better to me. I know anything above is a waste of money.

---------- Post added at 11:19 PM ---------- Previous post was at 11:18 PM ----------



Whoa whoa whoa, where is this gayblue you speak of?
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