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uk/european octane ratings are not the same as the us. they do the math differently, so it is apples to oranges > > From: Aaron Clow <cars@tiserves.com> > Date: 2005/06/09 Thu PM 02:45:59 EST > To: type3@vwtype3.org > Subject: Re: [T3] Engine noise > > Daniel Baum wrote: > > >> Sounds like detonation to me. Very serious. Back off the throttle > >> til it > >> stops when you hear it. > > > > > > I always either back off the throttle or downshift when this happens. > > > >> > >> To Check if this is indeed your problem, buy premium the next time > >> you fill > >> up. If the problem goes away, it is indeed detonation. > > > > > > I had wondered whether I needed a higher-octane petrol but I would be > > quite surprised if this is the case. I use 96 octane. Since they > > stopped selling leaded petrol over here a couple of years ago, the 96 > > octane has had a potassium additive added to it (I think this is what > > they call LRP in England). Other options are 95, 98 and 99-octane > > unleaded. Surely it shouldn't require 99 octane? > > Yipes! Here in NY I think the highest we can get is 94 (Sunoco Premium). > 93 as premium is much more common. If you're getting pinging at 96 > octane, either your engine compression ratio is completely messed up, or > this is NOT the issue. > > Aaron > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Brian Fye-- http://www.geocities.com/menacefye 64 Notchback, 64 Notch Speedster, 67 Squareback, 73 Squareback, 74 412 Squareback Automatic