There really isn't much to be gained unless you re-tune the engine to take advantage of the 'better' fuel. It would also be more economical to use a bottled octane booster at every fill. Race fuels also don't store well so use it as quickly as possible.
My Australian spec Nords (standard trim 'leaded' engines / Dell'Ortos/) all ran a little better on leaded avgas, but idled woefully and in stop-start traffic the fumes would give me a headache (and probably cancer.....). I also suspected they would close up the points quicker, but that's probably more to do with how they were driven on avgas than the avgas itself. I would advance the ign timing a touch when running the 130. Beatle Alfaless in Oz -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Brase Sent: Thursday, 16 February 2012 10:19 AM To: Stefano Iachella Cc: [email protected] Subject: Re: [alfa] Octane Unless you are having pinging/pre-ignition issues, why bother? If you have pinging then you need to raise the octane rating ALL THE TIME. If not you will gain nothing by boosting the octane rating, "once in a while." John Markleville, USA On 2/15/2012 9:46 AM, Stefano Iachella wrote: > Cats: > > If one mixes a gallon or two of 110 racing fuel with pump gas, > what octane can one expect? Is it a straight calculation, like: > > X = (2*110 + 9*91)/11, for an 11 gallon gas tank? > > Just found a local cart racing shop that has it for $9.50/gallon. > Don't want to do it regularly, but wanted to try a little bit once > in a while. > > In case flags go up about different cars, etc, I have a Spica > GTV with big valves on one car (no catalyst), and a Twin Spark > in the other car (no catalyst). The TS would normally expect > a minimum of 92 octane, but our max is 91 in CA. > > Thanks, > Stefano > Concord, CA -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected] -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
