well my car has a extreme compression ratio problem. Im running 93 octane and im still getting spark knock at any load. Ive had to retard the cam and timing alot to even run some what decent with out spark knock. So whats the most 93 octane will hold for compression

 

what engine management do you have? vafc / hondata / uberdata / chipped ecu
w/ hondata ,uberdata , or other standalone setups you can alter the ign table and have the ablity to tune around high compression on pump gas.

 

how high of compression ratio are we talking about ?

 

u said u messed with cam timing, but what you really need to mess with is ignition timing, and also make surwe u have plenty of fuel to go along with it. most people dont have problems running 12-12.5:1CR on 93octane

 

its about 12.8-1, ignition timing is at 10 degrees, chipped gued ecu, d-series motor, and plenty of fuel. Its preigniting just after 1500 with a load or no load at all

 

holy high compression batman!!!!

race gas or lower the compression a notch.

 

i just ordered a .050 head gasket and im going to try the best octane booster that i can find. i can get unleaded race gas 109 octane oxgenated . 5 gal 60 dollars

 

with 12.8:1 compression i think your problem lies elsewhere. with 6 degrees pulled off the base timing it shouldnt be pinging IMO. get it tuned properly before you do further damage

 

so that would mean 12 degrees because base is 18 and right now im at 10 degrees

 

12.5:1 comp on 93 octane daily driven.....I've had no problems what so ever.....Get it tuned properly like 99b16si said....