You can get a Lead substitute called a "Flashlube" my dad had to get one in
hi Patrol on Gas as the Valve seats were wearing badly with the LPG. This
Flashlube apparantly can replace lead from Leaded engines
Ryan
>From: Craig Overend <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Re: compression & optimax
>Date: Sat, 06 May 2000 02:04:26 +1000
>
>What fuel are you currently running it on? If its Leaded(Super) then
>Optimax is supposedly higher octane than Leaded so it should have no
>problem. Try a small tankful out.
>I've read that lead actually stays in your engine up to a year in normal
>driving after you stop using it. After that time that your valve seats
>get eaten away. You are supposed to be able to get a lubrication
>additive from Shell so that you can run your leaded engine on Optimax.
>Try that if you don't trust running without leaded fuel for the valves.
>Also remember, it is not just compression that determines whether an
>engine experiences knock. Swirl/Tumble in the cylinder created by the
>port(s)/valve(s), as well as squish/quench area turbulence and fuel
>atomization, greatly improve air/fuel mixing reducing lean pockets and
>increasing knock resistance.
>Your exhaust valve will probably run hotter with unleaded so a
>harder/higher temperature resistant material valve may also be needed,
>ask the experts.
>
>Craig.
>
> > Wayne wrote:
> >
> > Listers,
> > This is not datto related, but I know there are some pretty cluey
> > people online, and you
> > may be able to answer.
> > My 202 supposedely has 10.2:1 compression ratio, but is cammed up so
> > it therefore bleeds
> > off compression. Chamber pressures measured were 180PSI. Would this be
> > too much
> > compression to run on Hi-Octane (Optimax) unleaded fuel. (Providing I
> > get hardened valve seats
> > put in). Any other mods needed to convert to Unleaded?
> > -wayne
> >
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