On Tue, 24 Jun 2003, steve bridge wrote:
> In my TR6 motor, I use Aviation fuel from the local depot. They have a
> pump around back, I think it is at $2.20 per gallon. Expensive, but if you
> only put 3-6 thousand miles on your car per year, the actual difference in
> the dollar amount spent is insignificant. I had seats and bronze guides
> installed so I can run fuel as dry as Av gas with no fear.
> The bonus is Av gas has no sulphur to rot your babbits!
> Steve
Please note that running a street car with av gas is a violation of
federal law (for a number of reasons, including road taxes and EPA
guidelines). This assumes that you are a US citizen though. If you live
elsewhere - check with your local laws.
Please also note that running 110 octance (r+m/2) is completely
un-neccesary unless you get to insane compression ratios (more than 10.5:1
in an iron engine) and/or serious ignition advance (like in the 30 degree
range total).
The fact is - using your 2-3k mile per year logic, that the payback for
using av gas is _never_. If you run 2-3k miles per year, you'll get 20-30
years of driving on your TR6 before you'll have to think about doing ANY
valve work, even if you run it on (legal) pump gas. Think about it.
Now for my opinion. If you put in bronze guides and you don't have a race
motor, well let's say that you probably could have got more value if you
spent the money elsewhere.
Sorry to be a crumudgeon, but this is a hot-button topic for me.
I'll make the statement (again) for posterity: A TR6 engine running mild
compression increases or stock compression will run a long, long time on
the stock valve seats and guides. If you pull the motor for a rebuild,
don't waste your money on new seats and guides _unless you have measurable
valve-seat recession_. Only then do you need to consider installing new
seats.
regards,
rml
p.s. and now for some levity - there's an av-gas dispenser near me. The
local import/tuners come down and buy the fuel ($5/gal!) to "make thier
cars run better". Surprise, surprise - a few weeks later, they come back
FURIOUS because thier cars won't run anymore. Gee - the cat converter is
bad, the O2 sensor is dead... I wonder how that could be?
:-)
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