Re: IML: Lead Additive

[sosmi@xxxxxxxxxxx]

A  sure bet on hardened valve seats, would be 74-75, 3769902 , 76-78 4006452 head castings. The 73, 400-440 motor home3751213 head, may have been the first. I believe, we had no lead, and reduced lead fuels in 72-74. We still had Clark Super 100, and Sunoco 240-260 in Detroit, in 71-75. At that time we paid about $ 1.5-2.00 for 100-130 Av-gas. Now, just a bit of engine tech, since all engines have a "Design Octane Requirement" If you run a fuel with less octane than the design rating, the engine will develop 1% less HP per point of rating below design. At the same time, using a fuel that exceeds the design rating, there is no HP gain.(except higher cost). The 100LL Av Gas will give a noticeable performance improvement, and has all the octane you need. You will need to adjust timing, and carb adjustments, but it sure is fun to see what happens.Keep in mind, unless you have a really fresh, or otherwise GOOD engine, the real benefits will be lost, and all this disc ussion is for naught. Ya'll have a nice day, Dave.

 

-------------- Original message --------------
From: aeyn <mr85000@xxxxxxxxx>

> In this same vane, we have a 1975 and a 1993, both of which were
> made for unleaded. When did Chrysler start making our Imperial
> engines unleaded compatable 1972? I think that the slant 6's in
> 1971 were unleaded compatable (hardened seats). AND I think that
> it also had something to do with the compression ratio being
> lowered slightly in the Chrysler engines versus quite a bit in
> Fords nad GM's
>
> Æyn
>
> --- "Steve B." wrote:
>
> > > I would suggest converting the engine to unleaded. Lead
> > was a lubricant
> > > and without it you will fry the >softer leaded specific parts
> > eventually.
> > > Having to deal with unle aded additives is a science in itself
> > and is very
> > > >costly. An engine rebuild will pay itself off in a short
> > period of time.
> > > I burned up a lifter trying to keep up with >it and was
> > always battling a
> > > ping even with high octane gas. After my engine was rebuilt
> > and converted
> > > to >unleaded, I can run on 87 octane, all day long, and never
> > have any
> > > issues. Plus I got about another 10 HP >from just machining
> > the heads a
> > > hair off in the process. I have never had to worry about gas
> > or additives
> > > >since. Plus 87 octane is cheaper then 94 and the cost of
> > additives in
> > > every tank full. Trust me on this one.
> >
> > The only leaded specific parts are the valve seats. Changing
> > them has no
> > effect on the octane requirement of the engine. If you are
> > running 87 with
> > no ping issues then your timing is not set correctly. On my
> > '59 using 94
> > octane and setting the timing so it just barely pings under
> > heavy throttle
> > make a tremendous difference in the amount of power. I
> > sometimes pull the
> > timing back and run '87 when I am taking a road trip but I
> > can't stand to
> > run it that way around town. Just tooooo slow.
> >
> > Steve B.
> >
> >
> >
> >
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