high knocks running on toulene
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From: Republic Of Ireland
high knocks running on toulene
well i tought that toulene mixture would have improved knocks,especially on high boost.
yestreday i tried 5%toulene&xylene mixture on full tank,and afterwards went for a drive with dattalogger,and the knock sum was unbeliavable.anywhere from 11 to23.
usually i only get 1-2 knocksum on wot with normal fuel.
car actually runs smoother,but doesnt go well in WOT.
did anyone else had this problem??
thanks
From http://elektro.cmhnet.org/~charlie/p.../toluene.html:
Because toluene is such an effective anti knock fuel it also means that it is more difficult to ignite at low temperatures. The Formula 1 cars that ran on 84% toluene needed to have hot radiator air diverted to heat its fuel tank to 70C to assist its vaporization. Thus too strong a concentration of toluene will lead to poor cold start and running characteristics. I recommend that the concentration of toluene used to not exceed what the engine is capable of utilizing. i.e. Experiment with small increases in concentration until you can no longer detect an improvement.
Thread Starter
Evolving Member
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Joined: Nov 2007
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From: Republic Of Ireland
i dont have the wideband to measure afr,and stuff i used i got it from a chap who works in the paint store,they use it for diluting paints,so i dont know if thats the right stuff.
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From: Columbus, OH
FYI, where does the 114 octane number come from? It's a "blending" octane number, measured in the 1940s when straight-run, distillate gasoline (before catalytic cracking and hydroformation) was typically 50 to 60 octane. To get a blending octane number you run a 20% mix of the test fuel in a 60/40 mix of "iso-octane" and n-heptane (60 octane by definition), measure the octane number, and extrapolate to 100% test fuel. So while a little toluene really helps out a poor quality base fuel, it doesn't have the same effect when you start with modern gas (which is already 20 to 30% aromatic). I've never come across any measured octane numbers for pure toluene.
Dave