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Avgas

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bfit:
I remember when benzene  was available on pump at the servo I think it was BP in  Figtree  where we would fill up
 
but the problem with av gas and the like, if your going to get serious about it
you need to work out just how you want your engine to run.
what your going to do with it
Road  track or both.

lean is a problem with Av-gas,
  ignition has to be reduced if your going to run on the lean end of the scale
and valving etc can take an hammering
So what is need is a compromise  between  mid range to rich
the carby will been re jetting  and tuning and  the ignition system will need to be set up  correctly
to get the correct advantage curve in the  distributor.
and one has to drive  to suit the  conditions. no  flooring it and hanging on, it wont work.

 its is not so straight  forward  swapping fuels

I dont see a  real problem to run 10.5/1 or even 11/1 compression ratio on 98  and stile run  22 to 24 degs static advance and  36 degrees total advance.
unless your chasing a few extra HP 98 will do the job
  just don't  give it a big boot full under 3000 RPM in most engines and you wont  lean out and get  pre ignition( Pinging )

  There's so many other influences to consider as well, out side what I have briefly  mentioned
Bfit
 

Matt G:
Thanks Bfit. A wealth of knowledge as usual. Thank you.  Maybe I should find a good dyno guy and get what I've got running to its best before I try adding some boosters or new fuel.  I can't remember the octane ratings that I used in the USA?  My engine runs smoother now than it every did in the states, however I'm definitely running rich on 98 and my current (unchanged) carbi settings, so I'm now thinking that they must run higher octane which would lean it closer to even based on the above?

gtc:

--- Quote from: Matt G on December 04, 2014, 06:27:30 PM ---Maybe I should find a good dyno guy and get what I've got running to its best before I try adding some boosters or new fuel. 

--- End quote ---

Reckon that's your best move at this stage. A good tune-up ought to make a big difference.

Club advertiser Ross Carulli at Ace Carburettors & EFI Services, Blacktown, has sorted out a number of members' carbies.

rosco:
I was running 91 in the states but on a RON its a 95 out here, most of the states thats all you can get, some places do hold the 93 but that,s with ethanol which is 98 out here.
I have been reading the thread and to be honest Matt to even think of Av Gas these days is a dream, why would you ever think of it unless you are running for pink slips and want the total out of the car it was something we did in the 80s same as we mixed Benzine in with the fuel, I think I even have my old beakers and fuel weights if you want to try it.But be prepared re graph dizz cooler plugs ext ext.
Have it set correctly on a good tune its really not that hard if you have all your specs of you compression and cam spec,s but if its out of your hands send it to Easy 10,s at St Marys he will get it going like a scolded cat. :thumb:

Ross

rosco:
if you are looking for the extra now and then just get a 150 shot nitro,s system. :pepper:

Ross

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