Whew at 11:30 pm I do believe we do not have a connection of what the original
question was,,,,what were you discussing any way?
I still say :
1) proper ignition is first
to maintain a cooler running and proper firing engine
2) proper fuel alotment or distribution
to maintain an even amount of fuel to be able to fire at the right "time" wil
let the engine run cooler and throw away all the high fuel octanes quoted before
and/or unless you have a high compression racing engine.
An added note. If your engine is running hot from any of the deviances the fix
the mechanical part before going to an additive . Also Wynns I believe has a
product for @$7.00 to be inserted in the vacume line and will quel the hot
carbon problems caused by imporper adjustments.......
Thus your wallet will not be squished by the Lucas monsters.
c
phew did I say that?
Jarrid Gross wrote:
> Jan wrote,
>
> >Greg,
> > Maybe Jarrid would comment, but I think a lot of pre-detonation is
> >caused by the combustion chamber's squish band not properly designed for
> >the engine use. High octane can be a remedy and/or a requirement (due to
> >the higher compression pressures). But I know from my 2-stroke engine
> >work that the squish band is very important.
> >Jan
>
> The squish on the alpine engine is kinda funny.
> With the bathtub shaped combustion chambers and the rather large distance
> between
> the piston at TDC and the flat of the head (which makes the squish zone), it
> appears that the alpine is not only a weak squish engine, but that the
> turbulance
> that the compression imparts is not very directional.
>
> Squish is important for improving thermal efficiency, but but then again so
> is
> materials selection (alloy) and surface finish (smooth), and cumbustion
> chamber
> shape (hemi VS wedge ect).
>
> Today, stock auto engines run 10/1 compression on 92 octane fuel.
>
> Pre-detonation can be caused from a whole slew of evils, where octane is the
> typical band-aid.
>
> For those building hypo alpine engines, you should probably consider that
> the alpine engine is not a well engineered machine in these respects and
> that
> you will likely have to through octane at the beast to prevent detonation.
>
> One thing I'd like to see some day, would be some alpine pop-up pistons
> that would allow a nice holbay-like combustion chamber, with a reasonably
> high compression ratio. Such a piston might produce a superior swirl
> in the combustion chamber, and perhaps allow for lower octane requirements.
>
> Jarrid
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