Re: [DML] Re: Failed emmissions AGAIN
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Re: [DML] Re: Failed emmissions AGAIN

I think, aside from combustion chamber carbon deposits,  is the fact that 
high test premium gas is formulated to burn more slowly to prevent 
detonation in high compression engines. Regular gas burns faster and if all 
else is right with the engine and the emission numbers are ALMOST correct 
then using regular could possibly make the differance in passing emisssions. 
It's certainly a quick and easy thing to try and doesn't cost anything as 
compaired to throwing parts at your engine.

Bruce Benson

> --- In dmcnews@xxxxxxxxxxxxxxx, "Tom Niemczewski" <tomciodmc@xxxx> wrote:
>> One of the reasons for your failed emissions might be the prolonged
> use of
>> premium fuel. I am assuming that you mean 93 octane. Higher octane gas
>> causes deposits to form inside the cylinders and in the exhaust
> system. That
>> in turn will over time cause the compression to be raised. With that
> you
>> will get higher temperatures in the center of the cylinders along with
>> unburned gasoline close to the edges of the cylinders.
> How come I've never heard of this? Granted, I'm not a mechanic nor an
> engineer, but I'd think is this were true enough to cause problems
> this knowledge would be more common than it is.

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