just wondering, i have a basicaly stock ej6 but the new zc motor only has 5k miles on it, and i want to treat it right. which one should i use? premium here is 91. i deff. dont mind filling up with premium all the time, but ive heard it can hurt my car?

open poll

 

Use the gas recommended for your engine. There is no point is using a higher octane, yes it can actually make your car run worse.

A lot of people thinking higher grades mean cleaner gas, higher octane just means its harder to combust.

 

hmm. so how do i find which gas is recommended? all i see is Unleaded

edit: motor = sohc d16zc jdm car = 97 civic coupe dx

 

provided the gas station isn't cheap, the octane rating should have nothing to do with the quality of gas. All octane is is a "detonation reducer," the higher the octane rating=the harder it is for the engine to detonate (ie, combust prior to ignition) and this SHOULD have nothing to do with the quality of gas.
A ZC engine has moderately low compression and, like most non-vtec honda's, you can get away with running **** water in it. Regular will work just fine.

 

thanks for all the advice guys

*starts pissing in gas can*

ill keep using regular then. ty again

 

doesn't utah have 85? Oregon only has 91... no 93 for me. Which state has the highest?

 

I only use Shell V-power(93 octane) There's a couple of pumps around here that have 94 octane, our premium is 93. Hooray east coast.

-Froth

 

unleaded.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by solbrothers &raquo;</TD></TR><TR><TD CLASS="quote">use what is reccomended for your engine. anything more is just throwing your money away </TD></TR></TABLE>

unless of course

in my turbo b16 sedan i run atleast 112 octane race fuel, high compression, 15 psi, 8500 rpm...yeah better safe than sorry, fresh tune coming springtime.

in my hatch recommended is 87 octane for my d16y7 motor, so use whatever is recommended.

 

funny how everyone who commented recommends running the gas made for the motor and 93 octane has the highest votes.

what everyone said is true. just stick to what it was made for. no point in wasting money for no benefits.

 

I use 91 with 12:1 compression no knock or pinging... thank god for california weather!!

If I could Id run a higher one, but oh well... and no running higher octanes arent "bad"

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Thateguhate &raquo;</TD></TR><TR><TD CLASS="quote">I use 91 with 12:1 compression no knock or pinging... thank god for california weather!!

If I could Id run a higher one, but oh well... and no running higher octanes arent "bad" </TD></TR></TABLE>

Well it isnt "good" to run higher octane than what the motor was made for. So might as well save money. With a 12:1 compression ratio that you have of course youre going to need higher octane but with his stock D series I think not.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by iVteC_PoWeR &raquo;</TD></TR><TR><TD CLASS="quote">

Well it isnt "good" to run higher octane than what the motor was made for. So might as well save money. With a 12:1 compression ratio that you have of course youre going to need higher octane but with his stock D series I think not.</TD></TR></TABLE>

yeah its not necessary, but I wouldnt consider it to be harming the motor either. I used 91 when I had a dseries and it ran like a champ... Got a bit more mileage out of it over the regular old 87 octane..

Its all in preference really..

 

What octain is recomended for dohc motors(B16, GS-R, ITR)?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GeorgiaSTi06 &raquo;</TD></TR><TR><TD CLASS="quote">What octain is recomended for dohc motors(B16, GS-R, ITR)?</TD></TR></TABLE>

91-93 depending where you are. The highest in some states is 91 and some are 93.

 

i use 91 only because my car actually requires it (99 si). but here at a gas station close by (i think 76) you can get 100 octane.

 

sohc = 87 octane

dohc = 91 octane

except 02-05 civic si uses 87 octane.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ejprimo &raquo;</TD></TR><TR><TD CLASS="quote">sohc = 87 octane

dohc = 91 octane

except 02-05 civic si uses 87 octane.</TD></TR></TABLE>

Stock SOHC = 87 octane
Stock DOHC = 87 octane

Using 87 octane on a K20 is asking for preignition.

@ OP:
You DO NOT NEED ANYTHING ABOVE 87 OCTANE. The ZC runs what, 9, 9.5:1 CR? You don't need anything above 87, putting a higher octane gas in your car "every other tank" will not do **** - it will not help you, it will not make your car faster, it will not give you better gas mileage.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RCautoworks &raquo;</TD></TR><TR><TD CLASS="quote">Use the gas recommended for your engine. There is no point is using a higher octane, yes it can actually make your car run worse.

A lot of people thinking higher grades mean cleaner gas, higher octane just means its harder to combust. </TD></TR></TABLE>

Agreement = 100%

Higher octane numbers mean more fuel stability until it ignites from pressure. The reason why you can't run pure octane is because then it's unstable - so it needs to be balanced out. I forgot what they balance it with.

Also note that octane numbers are just numbers - not percentages.

Diesel fuel doesn't pre-ignite until at least 18:1 CR - but I wouldn't recommend using it in your civic as it's a pressure detonated fuel, not sparked.

 

87 octane

 

My car is stock so I just follow my owner's manual which says "premium unleaded only". In Tucson that's usually 91.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hardedge &raquo;</TD></TR><TR><TD CLASS="quote">My car is stock so I just follow my owner's manual which says "premium unleaded only". In Tucson that's usually 91. </TD></TR></TABLE>

Tool

 

Engine Type 2.0 liter iVTEC DOHC 16-valve 4 Cylinder with Continuously Variable Cam Timing
Horsepower 160 @ 6,500 RPM
Torque 132 ft-lbs. @ 5,000 RPM
Fuel Recommended Regular 87 Octane Unleaded.

http://www.familycar.com/RoadTests/HondaCivicSI/

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ejprimo &raquo;</TD></TR><TR><TD CLASS="quote">Engine Type 2.0 liter iVTEC DOHC 16-valve 4 Cylinder with Continuously Variable Cam Timing
Horsepower 160 @ 6,500 RPM
Torque 132 ft-lbs. @ 5,000 RPM
Fuel Recommended Regular 87 Octane Unleaded.

http://www.familycar.com/RoadTests/HondaCivicSI/</TD></TR></TABLE>

Ah, I forgot the weaker K20 was in the Si, was thinking they both ran A2's for some reason - lower comp, my mistake.

 

actually using higher octane WILL do damage to the motor (eventually) it is bad to run high octane in a low comp motor your waisting money and perfromance.. honstly you will get better power out of lower octane with low compression then you will with higher octane