better octane?

[hek1620]

i have something that sounds like lifters tapping. but not sure exactly what it is. could it be from running 87 octane?

[1991S13]

If it is a pinging sound, or your car sounds like a diesel, then it may be detonation. Run that tank out and fill it up with higher grade and see if that helps.

If that's not it, there is a writeup on here about how to check the lifters, and another about how to remove the timing chain guides - try searching for both of those. Eliminate the possibility of fuel first, then check the lifters, then remove the chain guides. Could just be the chain ticking.

[hek1620]

thanks. i'm going to fill up with 93 next time.

[90SXSE KA24ET DREAMS]

thanks. i'm going to fill up with 93 next time.

no don't fill it up with 93.. that's too much if your running on a stock motor? 87 is too low and 93 is too much

fill up with 89 premuim gas that's what the car takes says so when you pop open the gas lid.

run the tank out... get fuel injector cleaner and fill up gas tank to full with 89.

add the injector cleaner into the gas tank first when on E then fill up tank. 89 only!!!

and also if that doesn't work your fuel injectors could just be tooo loud that may be what the sound is your hearing so maybe might need replaceing... and if your not burning/loosing any oil then its not lifters

[hek1620]

well i filled up with 93 and the sound went away. next time i'll fill up with 89 and see what the results r. thanks.

[DjPantsSpecR]

i would just like to note how ridiculous the comment was about running 93 on a stock motor.....

93 is no where near too much octane. Okay? 93 is just a little bit hotter than 89, its good for burning off carbon deposits. You could have even thrown some 100 in there, but you would just have to worry a bit more about burning out a valve, but you could do it.

OMG 93 is gonna blow my motor up! No, just use what you want, i just lost 93 but ive been using 92 in everything for years and... good god, why would you say its gonna be too much?

[90SXSE KA24ET DREAMS]

pssssh your funeral man. I would never use anything above 89 octane if the motor was all stock.

[Nismo_Freak]

i would just like to note how ridiculous the comment was about running 93 on a stock motor.....

93 is no where near too much octane. Okay? 93 is just a little bit hotter than 89, its good for burning off carbon deposits. You could have even thrown some 100 in there, but you would just have to worry a bit more about burning out a valve, but you could do it.

OMG 93 is gonna blow my motor up! No, just use what you want, i just lost 93 but ive been using 92 in everything for years and... good god, why would you say its gonna be too much?

93 octane fuel burns "cooler" because the mixture burns at a slower rate.

The engine will make slightly less power on 93 octane fuel, the only reason people run it is to get full timing advance which is more of a benefit than the reduction in burn.

Honestly just run the stock timing and some 89 octane fuel. It's not worth paying out the extra money for 93 when you are gaining 1-2whp.

[Nismo_Freak]

pssssh your funeral man. I would never use anything above 89 octane if the motor was all stock.

LOL... you could run 114 octane fuel and it wouldn't matter.

[hek1620]

so could she be making sounds on 87 because of a timing issue. how do i check/adjust timing?

[90SXSE KA24ET DREAMS]

so could she be making sounds on 87 because of a timing issue. how do i check/adjust timing?

run 89, use fuel injecter cleaner and let us know how it goes. and please don't use 93 or higher octane if your running stock timing and even if you are running full advacne timing I still wouldn't do it just because sooner or later something will happen.

[DjPantsSpecR]

something is gonna happen from running 93? i'm not sure there is any truth to this statement at all... i cant possibly think of one performance issue from running 93

granted our 240's dont have nearly enough compression to need to run 93 or even 92 or 91 (where ever you live)

i think this hilerious misconception must be based on too much advertising saying the words high octane excitment, like running high octane or octane booster is like running nitrous.

premium is only a safety net, run whatever, just stay off the 87

and it really matters where you got the gas at, i remember one place that always sold all three octane at the same price..... mainly because they were all equal in crappiness

one 87 is necessarily like another 87.... still dont use it though

[tonynalli]

ok if you really want to think about it, 93 is only 10 cents more per gallon then 89....so if you put 10 gallons in your car. how much extra would it be? one dollar. and if gas is 3 bucks a gallon for mid grade your only getting 1/3 of a gallon of gas more...so in my oppinon, its not really that much of a difference

[hek1620]

is there anyone who could say they know for a fact that 93 will mess up the engine? like a ase certified tech. or something. also about the timing, how do i check to make sure shes running straight? how much/little timing should she have?

[tonynalli]

i used to put the chapest octane in my car and it always ran like crap, and one day when i got curious i put some 93in my car, it ran like a champ, i then further advanced the timing till it started to fall over itself and put it back just a little bit, and i have had no problems ever since..

[hek1620]

again, how do we do this

[1991S13]

Turn the distributor.