gday all, now a friend told me the other day that he may be able to get avgas as a consistant thing at bout the same price as pulp. the qn i have is that since its illegal to use in the good ol 351, is it possible to run it as 30/70 avgas/ulp ratio or there abouts or will mixing cause a problem. And will it really make that much of a difference???
Had the same experience as Racer, with optimum timing on ULP98 + 20% toluene -vse- optimum timing on Avgas with my compression - 10.8:1 - was slower on the Avgas. Why the heck I don't know. Why is that Racer? Lower calorific value?
Currently I'm pleased with my current fuel blend. Using between 10-30% toluene, BP98, some oil additive and about 1.5% nitromethane. Not as good as the JP racing fuel I tried out recently, but at $120 for 20L, I'm not in a hurry to use it again.
The problem as I see it is that it is illegal to use it at all, otherwise I'd be straight on it. It would cure a lot of the problems I have as then I could run at 11.5:1 comp.
Also, apparently you won't be able to get it unless you can prove that you race, although I don't know how you are supposed to prove this.
The higher the octane the slower the burn rate is, this is it in a nutshell. If you have set the car correctly for 98 octance then stick in 105 with NO mods the car 100% of the time will go slower. You have kinda retarded the spark timing now due to the slower burn rate.
I have run 100ll avgas in my ea falcon as a 100% rate and found heaps more power and fuel economy, however i wont run too much in it as the lead will foul the catalytic converter and the oxygen sensor.
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