can I run 100octain gas in my 1970 2.0 ???? if yes what do I need to do for handling high-Oc gas ???
Hello THE OLD COOT,
Unless you are experiencing spark knock the 100. gas will be a wast of money.
What modification have been done to your engine?
I'm running a 2.0 W/ 12lbs. boost and I am running 105 Purple MIX with 94 Pump gas.
From Pintony
Unless you are running lots of compression or a power adder{nitrous,turbo,ect.}100 octane is over kill and really not necessary.
my auto instructor in high school explained it to me like this. higher octane burns slower and makes less power than a lower octane. and before anyone gets red behind the ears about that comment, I've seen a demonstration at a drag strip. higher octane will support more power, and detonate much less. a guy took his car to the track, stock engine, and made a pass with regular pump gas in it. he then drained his tank or something and put in some "race fuel." when he launched, his car ran a much slower et. I've seen it happen, so my theory is this. to make more power with a stock engine, run lower octane. or modify it and be done with it.
Krazi
krazi, the car was tuned for a certain octane. I would hate to see what running race gas did to his motor. He probably had fuel dripping out of his exaust. The spark probably didn't burn hot enough to combust all the fuel. That is how he lost power.
My Mazda3 runs better on mid-grade 89-91 octane than premium or unleaded. I get better fuel economy and throttle response from it. I took a couple tanks of each when I first purchased it to see what ran best.
In my Pinto 2.3L I ran the cheap stuff. 85-87 octane without trouble. But that was the stock motor.
First of all ...Thanks for all the info... really helps....I was looking for a "cheep" way to pick up a couple more HPs but it starting to look like Hi-Oc gas isn't it ...got talking to one of the locals who tryed Av-Gas and it cost him 3 new pistons and a new bore job.
Thanks again
Let's send it to myth busters!
Could be that people do other things at the same time they try new gas, and blame the gas. ???
Bill
when it comes to cars, I think those guys are full of beans. the "american graffitti" rearend thing they did, the car kept snapping the cable because they didn't use a period correct car. and I get better gas mileage with my tailgate down on my truck too.
krazi
Quote from: Pintony on January 21, 2006, 12:29:18 PM
Let's send it to myth busters!
Quote from: Pintony on January 21, 2006, 12:29:18 PM
Let's send it to myth busters!
I agree. Ill lend them my pinto to test it out! Well that is if they promise not to blow it up, we all know they love to blow junk up!
so far everyones right. the higher octane only slows the combustion process so that the fuel doesnt preignite (detonate) and cause spark knock. I ran some 100 octane that was given to me (cant beat free fuel!!) in my 78 suburban (has a 454) and it had less power and it coughed almost every time i tried to take off. Just more proof of what we're trying to say.....oh btw....that 454 only has an 8.25:1 compression ratio........yikes!
Quote from: krazi on January 25, 2006, 12:08:01 AM
when it comes to cars, I think those guys are full of beans. the "american graffitti" rearend thing they did, the car kept snapping the cable because they didn't use a period correct car. and I get better gas mileage with my tailgate down on my truck too.
krazi
the reason that the rearend didnt come out like the movie said it would is becouse the car in the movie i think was a 60s mopar witch had leaf springs and the one on they tried the myth on was a 92 or newer ford had a 4 link 8.8 and the trailing arms are just a little stronger than the leaf springs are
I agree with ADaughen, it has to be tuned for this type of fuel. The reason that you would need to, or want to, run this hi octane fuel, would be because your CR was over 10.1 or so. Or ,because you want to be able to run more timing, (total advance), and that's it. I've ran all grades of commercial gasoline in my stock 2.3, and in other vehicles, and there is no difference in power or mileage... if someone says there is, they are full of B.S.!!! The only way you'll get more power from doing this (and it's marginable), IS IF YOU TUNE FOR IT!!
Like was mentioned... high octane fuel burns slower than lower octane fuel.
If you have a standard lower compression engine it will LOSE power.
Not exactly what you want.
As for the av gas... I have known people who have ran it for years with no harm to the engine... Can see no reason it could do that harm.
Jim
Quote from: fomogo on February 06, 2006, 09:08:11 PM
Like was mentioned... high octane fuel burns slower than lower octane fuel.
If you have a standard lower compression engine it will LOSE power.
Not exactly what you want.
As for the av gas... I have known people who have ran it for years with no harm to the engine... Can see no reason it could do that harm.
Jim
If I could make one comment on AV gas: If you are running a O2 sensor ( like one on a late model 2.3 EFI car), you may damage it with AV gas. Unleaded gas does not damage the O2 sensors like fuel that contains lead or like additives.
Quote from: turbopinto72 on February 06, 2006, 09:31:29 PM
If I could make one comment on AV gas: If you are running a O2 sensor ( like one on a late model 2.3 EFI car), you may damage it with AV gas. Unleaded gas does not damage the O2 sensors like fuel that contains lead or like additives.
Yep...
I appologize for that oversite... I was thinking normal 70s vintage pintos.
It will also effect your cat convertors and emmissions testing if you have those.
Jim