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Old 08-28-2006, 05:58 PM   #1
ix8vii
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What is the difference between the 100, 103 or 105 unleaded compare to 110 leaded?
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Old 08-28-2006, 06:36 PM   #2
Sharky NRK
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well besides the fact that one is leaded and the others are unleaded they have different octane ratings of 100->103->105->110

consequently they will make more power in that order
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Old 08-29-2006, 04:48 AM   #3
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Thank you but besides the obvious.
Is 110 advisable to be use with a cat?
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Old 08-29-2006, 04:53 AM   #4
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Quote:
Originally Posted by ix8vii View Post
Thank you but besides the obvious.
Is 110 advisable to be use with a cat?
Could be wrong, but from what I've hear it's not a good idea to use leaded gas with a cat. It's also said to shorten the life of o2 sensors, and put a nice lead film on the planet(from the exhaust).

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Old 08-29-2006, 08:56 AM   #5
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leaded gas is a definate no with a cat, and a debated no with 02 sensors
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Old 08-29-2006, 09:46 AM   #6
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Thanks guys. Now I'll remember not to even use 110
One last Q, I heard someone use 91 craptane and mixed with 110 to make 95 octane. Is that even possible? I thought 110 are leaded
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Old 08-29-2006, 10:10 AM   #7
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you can mix any 91 with X octane and depending on the ratios get varying octane ratings. I would still stay away from running leaded gas even mixed (just my personal paranoid preference). Run the highest unleaded you can get -> and if you feel so moved mix the craptacular pump 91 with the highest octane unleaded you can find
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Old 08-29-2006, 03:05 PM   #8
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Thanks I like the idea. I can get the 103 or 105 a little cheaper than the 100 octane in a 5 gl pail.
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Old 08-29-2006, 03:33 PM   #9
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From what I've heard, mixing 91 and 100 unleaded to get 93 is not the same as using 93. The 93 would be 1 fuel, and have the properties of that fuel. The 91/100 mix is just that, a mix. The 91 would still burn faster, and explode easier without a light. Adding a leaded fuel might be different, but I wouldn't know because I'm not sure if the lead compount would effect the 91 or not. To reiterate, as far as I know, 100 octane unleaded along with 91 in equal parts does not make 95.5(<point).

peace

Last edited by hippy; 08-29-2006 at 04:02 PM.
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Old 08-29-2006, 04:08 PM   #10
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^^^^ that is not quite what I have heard, but I am not an expert. I do know that adding 100 octane to 91 will in fact give you more detonation resistance and I have experienced it. Whether if is 95.5 or 93 or 97 I do not know, but mixing will increase the knock index of the fuel according
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Old 08-29-2006, 04:13 PM   #11
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Quote:
Originally Posted by Sharky NRK View Post
^^^^ that is not quite what I have heard, but I am not an expert. I do know that adding 100 octane to 91 will in fact give you more detonation resistance and I have experienced it. Whether if is 95.5 or 93 or 97 I do not know, but mixing will increase the knock index of the fuel according

That was my point. I don't think people get the octane equivalent they think they'd get from a given mixture. Not saying that adding 100 octane to 91 doesn't help, but it's like water injection in the way that the 100 octane seperates the 91 up more, and cools it down more then it would normally be cooled, and stops a lot of it from being lit quickly, but it's still 91 octane in there.

peace
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Old 08-29-2006, 04:39 PM   #12
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That was my point. I don't think people get the octane equivalent they think they'd get from a given mixture. Not saying that adding 100 octane to 91 doesn't help, but it's like water injection in the way that the 100 octane seperates the 91 up more, and cools it down more then it would normally be cooled, and stops a lot of it from being lit quickly, but it's still 91 octane in there.

peace
agreed
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Old 08-29-2006, 04:48 PM   #13
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i can attest to the blown o2 sensors due to race gas, if you use it enough they will go bad and are quite costly to replace, its the main reason i switched to methanol...
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Old 08-29-2006, 04:58 PM   #14
Sharky NRK
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^^^^ race gas or leaded race gas
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Old 08-29-2006, 05:09 PM   #15
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sorry I meant to write leaded race gas (I used to use c16 like it was my job haha)
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