Thanks for the correction,
Just my old school thinking....
LOL when I start babbling


----- Gimpster -----

 

The 420 owners manual states to use 86 (or higher)

 

<div class="FTQUOTE"><begin quote>Originally posted by: gerkendave

What about for a 420 rancher all stock? I'd just look in the book but i won't be able to get to the book till this weekend and now i'm curious.</end quote></div>

Rancher manual says "86 or higher".

Pump gas here is 87, 89, and 91. I run 89 just for a little insurance against ever getting any detonation, but would consider 91 to be overkill.

 

<div class="FTQUOTE"><begin quote>Originally posted by: foreman4504X4

i have always ran on 87 and i have put 1000s of miles on my fourwheelers, it doesnt seem like it has hurt anything but i may just be lucky</end quote></div>

I think it is best to always avoid this type of "anecdotal" information! If some guy said that he had run **** in his engine for all these years, would you go out and try that????

Run what your owner's manuals spec, and forget anything else you might hear! Again, every engine is different, and they are each going to have different requirements, so there is never going to be any "one octane fits all" fix. But, if you are not sure what to run, it is always better to run to high an octane than to low.....

 

I think that reconranger sums up the entire octane controversy best.......... use a little more octane than you need.......

As said if the compression requires 87 octane, use 89. Especially if the fuel is stored for a while..... If it says 91, use at least 91-93, because anything less is going to cause eventual valve run out and you will be adjusting your valves every week........

 

No, thank you Gimpster. As usual from you, great post. Posts like this cause a lot of learning.

 

now wat about the ethanol or no ethanol issue.. the 89 octane is a 10 percent blend, would it be best to use ethanol or to not. And if not the only other choice is 87 and 91, between those two should i run the 91 (in my pickup the 91 equates better mileage) would it do anything noticable for power, cleaner burning or fuel economy for my quad?

 

Without writting a whole book it goes like this:

Alkie has less energy (BTU's) than straight gasoline. That is why when you run straight methanol it takes about twice amount of fuel for the same miles driven. (Ethanol has a little more.)

That is why blended ( with alkie) gas gets less MPG than straight gas.

As far as power goes: The blended gas will win out over straight gasoline. (slightly) That is because the blended gasoline has an O2 agent in it. (the alkie). When you have a chemical that has a hydrocarbon and O2 in it, it REALLY goes bang. That it why nitro is one of the most powerful fuels in the world. ( It's like 52% O2 (from memory) It's also the reason it takes about 5 gallon of fuel to go a 1/4 of a mile!!!!!!!!

 

Nitrous is sold by pound not by volume. Also Nitrous is not a fuel. It is an accelerant. Three ways to increase power..... More fuel and more air. This is done by supercharging or turbo charging. Option 2..... More fuel and purer air (oxygen) or fuel and nitrous, the problem with adding oxygen by itself is that it is such a catalyst that it makes the fuel burn too quickly. Also the little issue that anything will burn in the presence of pure oxygen if an ignition source is present. This is why nitrous is N20 the two nitrogen molecules slow the burn rate to something manageable. Option 3 Supercharge/Turbo and Nitrous.

Disreguard Dr. Turbo, thought you where talking Nitrous Oxide. Reread your post and see you are talking nitro-methane

 

I have a 97 300 ex and i all ways mix octane booster and unleaded and i have seen better clutch response and higher to speed or you can just buy race fuel but cheap way is unleaded and octane booster