2007-02-25 14:33:39 · 5 answers · asked by Charlie V 1 in Cars & Transportation ➔ Maintenance & Repairs
you need at least 91 for that one ,or run an octane booster in what ever you run in it,that will make it run a lot better,if you go to a lower grade add some booster to it,and it should do alright,good luck,i hope this help,s.
2007-02-25 14:38:39 · answer #1 · answered by dodge man 7 · 1⤊ 1⤋
This depends on more than the compression ratio, and it's a judgement call. For a modern engine with computer controls and adjusted properly, 87 is too low and you don't have much liberty with adjustments. You want an octane level that doesn't make crackling sounds under full throttle. Anything more than that is probably unnecessary. For an older engine or anything you have more liberty to adjust, start with the recommended settings (timing) and pick an octane level that doesn't crackle under full throttle. But here you can tweak a bit by retarding the timing, which may get rid of the crackle (preignition/detonation) if you don't have to go too far. Performance will go down a bit and there's a tendancy to heat up more, so you don't want to go to extremes with it. But if it's just a small tweak and the engine allows it, it might get you down a grade. If you aren't comfortable doing this, just buy the next higher grade.
2007-02-25 23:17:53 · answer #2 · answered by Anonymous · 0⤊ 0⤋
There's no "simple" or correct answer due to many variables. How much "cam" is in the vehicle, timing (advanced or retarded), altitude at which the vehicle is operated, weight of vehicle, load, transmission type and a host of other variables. That being said, I would try to run it on the lowest octane that will permit the engine to run without pinging, which may take some experimentation. For a "ball park" figure, start with 89 Octane ("extra") and then try 87 ("regular"); if there is a noticeable decrease in performance, go back to the slightly higher-priced 89. You could also try 91 ("Super"), but I would think the 89 would suffice in most applications.
2007-02-25 22:43:54 · answer #3 · answered by Kiffin # 1 6 · 0⤊ 0⤋
High compression like that needs 95 octane or better. Most modern cars have about 9:1 compression and will use lower octane fuels.
93 octane is about all you can get these days so a little "octane booster" can help. Try to find some that don't rely on alcohol.
2007-02-25 22:43:36 · answer #4 · answered by Anonymous · 0⤊ 0⤋
it depends on cylinder temp i would run the lowest you can with out spark knock or ping with the timeing where you want it
2007-02-25 22:46:38 · answer #5 · answered by smitty 1 · 0⤊ 0⤋