11.8 CR Need advice
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From: BFE
11.8 CR Need advice Planning on getting MTI 5.3 stage 2E (58cc).
Which will net me a 11.8 CR.
Now I need feedback as to whether 98 Octane premium is enough to run normally on the street and be safe from detonation
Here Regular is 95 Octane and Premium 98.
Which will net me a 11.8 CR.
Now I need feedback as to whether 98 Octane premium is enough to run normally on the street and be safe from detonation
Here Regular is 95 Octane and Premium 98.
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From: Cecil County Raceway!!!
are you sure you'll be at 11.8:1? How much are they going to mill off the 5.3L heads? I had .040 which I was told was 11.8:1...but I haven't CC'ed to verify.
I run 93 octane without any pinging
I run 93 octane without any pinging
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Well, you can't go wrong with posting it here. I've heard of guys running 11:1 on 93 premium. You will be cutting it close. It also depends on your timing, the quality of your heads, and a million other things. I'm really not sure, but until somebody more qualified answers you, I'll say that it will be cutting it close.
On The Tree
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Originally Posted by PREDATOR-Z
Planning on getting MTI 5.3 stage 2E (58cc).
Which will net me a 11.8 CR.
Now I need feedback as to whether 98 Octane premium is enough to run normally on the street and be safe from detonation
Here Regular is 95 Octane and Premium 98.
Which will net me a 11.8 CR.
Now I need feedback as to whether 98 Octane premium is enough to run normally on the street and be safe from detonation
Here Regular is 95 Octane and Premium 98.
Dang it! Tennessee sucks! Thread Starter
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From: BFE
Originally Posted by Fireball
are you sure you'll be at 11.8:1? How much are they going to mill off the 5.3L heads? I had .040 which I was told was 11.8:1...but I haven't CC'ed to verify.
I run 93 octane without any pinging
I run 93 octane without any pinging
He said they are 58cc which will be around 11.7>11.8:1 with graphite gaskets.
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From: BFE
Originally Posted by Slowhawk
I use to run 11.4-1 on 93 octain and 30 degree's of timing..The Cam overlap also plays a role on compression.
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From: BFE
Originally Posted by steve2001sh
Well, you can't go wrong with posting it here. I've heard of guys running 11:1 on 93 premium. You will be cutting it close. It also depends on your timing, the quality of your heads, and a million other things. I'm really not sure, but until somebody more qualified answers you, I'll say that it will be cutting it close.
Cam X1 230/227 112lsa with +4.5 degree overlap
You can run even more compression then that if you have the tune done correctly and timing pulled out. However I am sure you are asking the question because you want to run 28-30 degrees of timing (where most guys make best power) and at the same time have no knock.
You typed 98 octane. I have never seen this but if 98 is the correct number then you should be just fine.
If you ment 93 octand I wouldn't go much higher then 11.3 CR.
You typed 98 octane. I have never seen this but if 98 is the correct number then you should be just fine.
If you ment 93 octand I wouldn't go much higher then 11.3 CR.
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From: BFE
Originally Posted by WILWAXU
I have no problems with 93 octane. I don't think my compression ratio is that high.. and those heads should be close to the same as mine.
Give MTI a call.
Give MTI a call.
58.27cc will yield 11.6:1 so I figured that a flat 58cc would be around 11.7>11.8:1
Was I wrong in my assumption?
You are running 5.7 stage 2E's and mine would be 5.3's (58cc).
What is your CC on your heads??
from what i've learned dynamic compression will be a better determinant. FWIW im going to be around 11.6 for my new setup, will probably have to run a mix of race if im going to be able to run high timing with 91 
Thread Starter
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From: BFE
Originally Posted by JZ'sTA
You can run even more compression then that if you have the tune done correctly and timing pulled out. However I am sure you are asking the question because you want to run 28-30 degrees of timing (where most guys make best power) and at the same time have no knock.
You typed 98 octane. I have never seen this but if 98 is the correct number then you should be just fine.
If you ment 93 octand I wouldn't go much higher then 11.3 CR.
You typed 98 octane. I have never seen this but if 98 is the correct number then you should be just fine.
If you ment 93 octand I wouldn't go much higher then 11.3 CR.
Wish it was like that in back home in TX.
