gas mix question - Team Camaro Tech
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post #1 of 8 (permalink) Old Jun 25th, 18, 08:45 AM Thread Starter
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gas mix question

Some weekends I run with a another old guy who races. It happens to be a Ford FE that's in a stang that's completely old school. Parked in 81 when the twins were born, woke up 3/4 years ago. runs high 10's. Normally runs VP Vintage Leaded. For some reason he dumped some VP C-12 in it after the first round. Till the day was over it was running a half second slower and we were scratching our heads until we noticed the fuel can. The bottom line question here is if we should pull the heads for a look. After a look on line at the chemistry I can see this was too far a jump, minimum of 12 max of 16 depending on which scale you use. I don't have any kind of experience with what a rash move in octane into the slow burning ranges does to a NA motor that's having the snot wrung out of it.
thoughts?

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post #2 of 8 (permalink) Old Jun 25th, 18, 09:04 AM
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Re: gas mix question

Put the other fuel in it and see if it runs faster again

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post #3 of 8 (permalink) Old Jun 25th, 18, 09:07 AM
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Re: gas mix question

I know if I play with higher octane fuel, I have to adjust my timing to burn it properly.

I'd go back to the fuel his tune is set up for,unless he's going to get on a dyno or use up his track time playing with his tune.

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post #4 of 8 (permalink) Old Jun 25th, 18, 09:29 AM Thread Starter
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Re: gas mix question

I was worried about damage. That jump is so great that with the slow burn we may have been blowing gas out the pipe and running lean. Getting that side oiler apart in the car is a task for younger guys.

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post #5 of 8 (permalink) Old Jun 25th, 18, 10:49 AM
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Re: gas mix question

I doubt there's damage usually detonation causes damage(if he got lower octane).
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post #6 of 8 (permalink) Old Jun 25th, 18, 11:20 AM
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Re: gas mix question

I asked a ? about Av gas compared to 110 and got no answer here. another forum posted several links. the one link stated there is no such thing as to much octane only to little
this was not from an individual, but from someone with knowledge of fuels
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post #7 of 8 (permalink) Old Jun 25th, 18, 11:30 AM
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Re: gas mix question

Very doubtful there is any damage, I would bank on there not being any in fact (from the gas that is).

As you may know higher octane = slower burn. If you donít need it (compression, timing) it only hurts performance. It may or may not be noticeable, but that jump clearly made a difference. He may have been able to pick it back up with more timing, but it depends on what the motor wants.

You can however kill a motor with detonation using too little octane. Too much I imagine can hurt eventually but it would have to be an unusual situation Iíd think.

Sean

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post #8 of 8 (permalink) Old Jun 25th, 18, 12:06 PM
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Re: gas mix question

Quote:
Originally Posted by flat tire View Post
I asked a ? about Av gas compared to 110 and got no answer here. another forum posted several links. the one link stated there is no such thing as to much octane only to little
this was not from an individual, but from someone with knowledge of fuels
Higher octane burns slower and does not equate to more power. You should use the lowest octane rating you can without causing pinging, detonation, run-on etc. Higher compression will require a higher octane rating but you still shoot for the lowest you can safely run...

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post #9 of 8 (permalink) Old Jun 25th, 18, 02:12 PM
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