fuel doesnt make valves drop, not in these. broken spring retainer etc does.
only issue i had with running 98 was some weird deposit of carbon that ended up preventing the valve from seating properly...and these things are a nightmare to try and grind the valves in! so much for using the expensive stuff that "cleans your engine"
anyway, ive never seen another engine develop that little carbon swirl in the same way, and it could have been due to other factors... was strange though. and annoying!
what sort of retailer says NOT to run premium? i like this guy!
the whole joke, con, call it what you will about high octane gas is that... you make more power from the low octanes, UNLESS you are set up for high octane... high compression ratios, knock sensors for EFI ECU systems that attempt to run as lean a mixture as possible and compensate for any irregularities... or you tend to lug around in too high a gear with too much load.
honda got away with 70 octane in some of their engines simply by revving the little things at about 16K+
the common cure to detonation or knocking/pinging due to low octane fuel is to drop down a gear (or two).
ie, the higher the engine speed, the less time there is for these flammable, compressed mixtures to ignite before theyre meant to. high octane just means "slower burning" which basically equates to the same thing...
as for ethanol...meh...
4 a gallon is NOTHING. we were paying virtually twice that...dropped a bit recently but i still dont quite understand how the price can vary by 30 cents/litre overnight...
