Timely reminder Rob. You may find it is more a case of which refinery it comes from rather than brand. As Bob said some use LPG, some use Butane and others use whatever they have too much of. They just get the octane rating test right and once it's out the gate it's all downhill.
A friend who races motorbike was having trouble so got a laboratory to do some tests. Short answer - in three weeks 98 ULP turned into 91.5 ULP when stored in plastic jerry cans. Local car dealers find the same problem and " make new vehicles run better " by draining old fuel and replacing with fresh fuel. Get your ULP from a supplier with fast turnover and don't store it for more than 3 weeks. Store in sealed containers in the dark. Happy flying, John Callahan. On 21 November 2014 16:40, Laurie Hoffman via dog < [email protected]> wrote: > Hi All, > > I can only reiterate Rob's words. Was astounded that with the extra > compression from new heads and the fact that some of the 'nasty' 98 PULP > had been sitting in storage for a month that we could see such resulting > detonation. > > After doing nothing but draining the fuel tank and refilling with some > LL100 the motor ran like a charm. After draining the Avgas and refilling > with some BP 98 PULP it ran just as nicely and on a hot day. > > Regards > Laurie Hoffman > > > > > ------------------------------ > *From:* bob <[email protected]> > *To:* [email protected] > *Sent:* Friday, 21 November 2014, 5:02 > *Subject:* RE: [DOG mailing list] Urgent - Fuel and detonation > > All, > > One of the cheap volatiles they put in is LPG. > If you want to check just how much, put some fuel into a glass jar with a > tight screw lid. > Put a mark on the meniscus at the start. > > Shake vigorously. > > Now note the meniscus. > If there is lots of LPG it will have dropped some. > > Bob W. > > > > ------------------------------ > > > *From:* [email protected] [mailto: [email protected] ] *On > Behalf Of *Rob Thompson > *Sent:* Friday, 21 November 2014 12:56 PM > *To:* [email protected] > *Subject:* [DOG mailing list] Urgent - Fuel and detonation > > G'day all, > Make sure you are not running Shell/Caltex premium now that summer is upon > us. > We had some in the Dimona and in only a matter of weeks the RON rating > dropped to the point where detonation was occurring. > Use BP ...it doesn't have all the cheap volatiles that evaporate quickly > and reduce the RON rating. > > > Rob Thompson > 0429 493828 > *Please note that my new email address is [email protected] > <[email protected]>* > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2015.0.5577 / Virus Database: 4213/8603 - Release Date: 11/20/14 > > >
