MoGas Tips, Tricks, Concerns, How To

"Matt Barrow" wrote in message
...

"soxinbox" wrote in message
...
If you run your car engine on 80 octane mogas, it will usually run fine.
If your car overheats, it will start to knock. If you have 100 octane gas
it will start to knock at a higher CHT than if you ran at 80 octane. This
is not usually a problem in a car that has a radiator and thermostat to
regulate the temperature.

I can't remember seeing anything less than 85 octane car gas since, oh,
maybe the 60's?


Around here the grades on the pump are 83,89 and 93. Here=South & Central
Arkansas.

On Fri, 12 May 2006 08:42:59 -0500, "Gig 601XL Builder"
wrDOTgiaconaATcox.net wrote:


"Matt Barrow" wrote in message
...

"soxinbox" wrote in message
...
If you run your car engine on 80 octane mogas, it will usually run fine.
If your car overheats, it will start to knock. If you have 100 octane gas
it will start to knock at a higher CHT than if you ran at 80 octane. This
is not usually a problem in a car that has a radiator and thermostat to
regulate the temperature.

I can't remember seeing anything less than 85 octane car gas since, oh,
maybe the 60's?


Around here the grades on the pump are 83,89 and 93. Here=South & Central
Arkansas.

I've always wondered why the mogas octane levels are different around
various areas of the US. Where I live (northwest), our mogas is
87, 89 and 92.

Bela P. Havasreti

"Bela P. Havasreti" wrote in message
...
On Fri, 12 May 2006 08:42:59 -0500, "Gig 601XL Builder"
wrDOTgiaconaATcox.net wrote:


"Matt Barrow" wrote in message
...

"soxinbox" wrote in message
...
If you run your car engine on 80 octane mogas, it will usually run
fine.
If your car overheats, it will start to knock. If you have 100 octane
gas
it will start to knock at a higher CHT than if you ran at 80 octane.
This
is not usually a problem in a car that has a radiator and thermostat to
regulate the temperature.

I can't remember seeing anything less than 85 octane car gas since, oh,
maybe the 60's?


Around here the grades on the pump are 83,89 and 93. Here=South & Central
Arkansas.

I've always wondered why the mogas octane levels are different around
various areas of the US. Where I live (northwest), our mogas is
87, 89 and 92.


Altitude - higher needs more octane.

Altitude - higher needs more octane.

Altitude-higher needs less octane

Karl
ATP CFI ETC
"Curator" N185KG

"karl gruber" wrote in message
...

Altitude - higher needs more octane.

Altitude-higher needs less octane

Correct -- that's what I get for rewording it three times.

Bela P. Havasreti wrote:


Around here the grades on the pump are 83,89 and 93. Here=South & Central
Arkansas.

I think he's mistaken on the 83.



I've always wondered why the mogas octane levels are different around
various areas of the US. Where I live (northwest), our mogas is
87, 89 and 92.

The lowest octane that you find in a given area has to do with altitude.
The higher you are the less octane you need. Around here regular is 85.5

Lower octane autogas is quite common in mountain states where the
elevation is high. Non turbo-charged car engines have a bigger
denotation margin at higher elevation and require less octane.

On 12 May 2006 12:00:24 -0700, "M" wrote:

Lower octane autogas is quite common in mountain states where the
elevation is high. Non turbo-charged car engines have a bigger
denotation margin at higher elevation and require less octane.

So that's why "super" mogas in Florida is 93 octane but only
92 octane in the Seattle area. Thanks everyone for the replies
(usenet is good for something besides arguing about politics
afterall!).

Bela P. Havasreti

"Bela P. Havasreti" wrote in message ...
On 12 May 2006 12:00:24 -0700, "M" wrote:

Lower octane autogas is quite common in mountain states where the
elevation is high. Non turbo-charged car engines have a bigger
denotation margin at higher elevation and require less octane.

So that's why "super" mogas in Florida is 93 octane but only
92 octane in the Seattle area. Thanks everyone for the replies
(usenet is good for something besides arguing about politics
afterall!).

Bela P. Havasreti


Both Seattle and Florida are basically at sea level. The lower octane is not explained by altitude difference in this
case....

..Blueskies. wrote:

"Bela P. Havasreti" wrote in message ...
On 12 May 2006 12:00:24 -0700, "M" wrote:

Lower octane autogas is quite common in mountain states where the
elevation is high. Non turbo-charged car engines have a bigger
denotation margin at higher elevation and require less octane.

So that's why "super" mogas in Florida is 93 octane but only
92 octane in the Seattle area. Thanks everyone for the replies
(usenet is good for something besides arguing about politics
afterall!).

Bela P. Havasreti


Both Seattle and Florida are basically at sea level. The lower octane is not explained by altitude difference in this
case....

Most of Florida is close to sea level.

You don't have to go far from downtown Seattle to be at 6000 feet.

--
Jim Pennino

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