93 Octane

[4wydnr]

The other day I ran some 93 octane in my stock 99 400, and it ran like crap. There was a huge lag in the throttle response compared to running 87 or 89. Is this due to the higher ignition temp?

[Joe400ex]

i couldnt imagen what could be the prblem cuz i just put the new jet kit and LRD full exaust and my machanic told me to run 93 plus the 93 is just more clean:devil:

[Joe400ex]

Originally posted by 4wydnr
The other day I ran some 93 octane in my stock 99 400, and it ran like crap. There was a huge lag in the throttle response compared to running 87 or 89. Is this due to the higher ignition temp?

were are you around in illinois

[Joe400ex]

were are u around in illinois

[cals400ex]

i am in staunton. :D

[Joe400ex]

is that evn near chicago

[FL426kid]

i have a 416ex and it runs much better with 93 than 87 or89.But when my motor was stock 89 ran the cleanest.

[Joe400ex]

y should it make a difference 93 is just more clean "jw":devil:

[Summit79]

Originally posted by Joe400ex
y should it make a difference 93 is just more clean "jw":devil:

I agree. You must have got some bad gas or something else was wrong. 93 is better, cleaner and ususally non oxygenated which means theres no ethenol. The ignition temp being higher is to prevent compression firing in high compression engines. Gas will fire when the sparkplug tells it to reguardless of what octane it is.

[FL426kid]

Sry shouldnt say notin considering i dont know the rocket science behind gas.

[cals400ex]

Originally posted by Joe400ex
is that evn near chicago



no it isn't. i am about 40 minutes north of st louis missouri.

it should be the other way around, why are you running 87 and 89 octane

[blakefoote]

i have a 2000 400ex and i ran the 93 octane and it was pretty sluggish

[Joe400ex]

if its stock i was running 87-89 but when i put 93 it was fine i dont know what is going on here:confused: