Which Gas To Choose?
#21
#22
Don't know if that's it (assuming the internals of the engines are the same) - just an idea off the top of my head.
#23
#24
My '95 takes premium. I have tried the lower octane, won't go up the hills in WV. Knocks, etc. The manual say 95 octane which I can't even find. The premium here is 93 octane. I even tried putting octane booster in to no avail. Just have to bite the bullet and pay for premium if I want to drive the thing.
#25
My '95 takes premium. I have tried the lower octane, won't go up the hills in WV. Knocks, etc. The manual say 95 octane which I can't even find. The premium here is 93 octane. I even tried putting octane booster in to no avail. Just have to bite the bullet and pay for premium if I want to drive the thing.
Octane booster actually lowers your octane rating and even if it did work think about it.
$5 for a bottle of octane booster for every tank of gas, or just pay the extra $5 to fill up with premium.
#26
Well on a non dizzy engine the knock sensors retard the ignition timing to adjust for the lower octane fuel.
On a dizzy engine YOU have to retard the ignition timing to adjust for the lower octane fuel, if you dont you will get spark knock (you may not hear it) and as we all know from high school auto shop spark knock over extended time will destroy a engine.
How much you need to retard the ignition timing I have no idea.
Now I will confuse you even more, there were a small number of low compression 3.9's imported to the US, those only require 87 octane, the compression ratio on those engines is 8.35:1 compared to the 9.35:1 on the "high" compression engines.
I do not know how to tell which engine you have.
On a dizzy engine YOU have to retard the ignition timing to adjust for the lower octane fuel, if you dont you will get spark knock (you may not hear it) and as we all know from high school auto shop spark knock over extended time will destroy a engine.
How much you need to retard the ignition timing I have no idea.
Now I will confuse you even more, there were a small number of low compression 3.9's imported to the US, those only require 87 octane, the compression ratio on those engines is 8.35:1 compared to the 9.35:1 on the "high" compression engines.
I do not know how to tell which engine you have.
If the ratio is 8.13, the manual states to use 91 RON, which equates to 86-87 "American" octane (AKI).
If the ratio is 9.35, the manual states to use 95 RON, which comes out to 90-91 "American" octane (AKI).
Remember those figures are for sea level. Lower octane fuel may be used at altitude (this is why in the Rocky Mountain states, fuel is sold at 85, 87, and 91 octane...in lower-lying regions, it's sold at 87, 89, and 93, respectively).
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