That was a great article. I hope everyone reads this and the guys that I
sent Amsoil catalogs to. I used PI the first day I brought my truck home
from the dealer. I can honestly say that since I been using PI I have had no
pinging, with 8100 miles.
Wayne
>
> Date: Thu, 28 Oct 1999 17:46:15
> From: Bob Tom <tigers@bserv.com>
> Subject: DML: Pinging Info. from Amsoil (LONG)
>
> Below is part of an Amsoil newsletter about pinging and
> Amsoil's gasoline additive to combat it. I am NOT in any way
> associated with Amsoil. I decided not to paraphrase their
> marketing literature and let anyone interested decide for
> him/herself. My view is that if you've tried almost everything
> and everyone is still stumped, it will cost only a bit of $$$
> to see if their additive will eventually work.
>
> I'm fortunate (fingers crossed) in that I have not had any
> pinging problems since I bought the Dak in Feb. '97.
>
> Last 8 paragraphs are when they talk about the additive.
> I found the prior paragraphs informative with respect to
> the causes of pinging.
>
> WHAT EXACTLY IS ENGINE KNOCK?
>
> Let's look first at normal spark-ignition combustion. Each
> injector sprays a charge of gasoline into its cylinder when the
> piston is at bottom dead center. The piston rises, compressing
> the gasoline-air mixture, which causes the temperature of the
> mixture to rise. At a defined point, the spark-plug sparks,
> which causes the gas-air mixture to burn from the point of the
> spark out to the edges of the cylinder. The energy released by
> the controlled flame front pushes the piston down, which turns
> the crankshaft and powers the engine.
>
> Knock occurs when the gas-air mixture spontaneously combusts
> prior to spark ignition or at a location away from the flame
> front. Combustion chamber deposits often cause this problem.
> Those spots of uncontrolled combustion act like tiny bombs,
> spreading shock waves and heat. Extended periods of uncontrolled
> knock is highly destructive. Retarding the timing of the spark
> reduces cylinder temperature, which inhibits the uncontrolled
> combustion and knock.
>
> But retarding the timing also establishes the flame front later,
> so the energy released by combustion "chases" the piston down
> instead of pushing it down. In other words, much of the energy
> of combustion goes unused. That's why your car goes into slow
> motion when the knock sensor kicks in. The knock sensor is most
> likely to kick in when the engine temperature rises-like when
> you're going uphill, passing and driv-ing in hot weather.
>
> - ----------------------------------------------------------------
>
> KNOCK SENSORS, FUEL ADDITIVES AND OIL SLUDGING
>
> We've all been there. You're driving along in heavy traffic with
> a hot sun beating down and you're stuck behind some huge
> rattletrap crawling uphill in second gear. You spot a tiny
> opening in the next lane and make your move. But your car's get
> up and go has got up and left, and you're crawling up the hill
> no faster than the ancient truck you intended to pass. What
> happened?
>
> Your knock sensor kicked in, that's what. More than half the
> cars sold in the U.S. are equipped with knock sensors, which
> retard timing when gasoline octane isn't high enough to allow
> the engine to perform the task it has been asked to perform,
> such as passing or going uphill or going anywhere in high
> ambient air temperatures. Retarding the timing of ignition
> protects the engine from knock.
>
> Most drivers are used to hearing the ping of knock, and not used
> to recognizing knock as the drop in power, responsiveness and
> performance that comes with knock sensors. But if you drive a
> newer model car, and you experience poor performance, think
> "knock", even if you don't hear the tell-tale ping. Your knock
> sensor simply adjusted the timing before you heard it. What can
> you do to protect your engine from knock and maintain the power
> and performance you desire?
>
> At first, you'd think the answer would be higher octane fuel.
> And, although it may improve performance, it may also be an
> unnecessary drain on your pocketbook. Additionally, higher
> octane fuel will not solve your problem if your engine knock is
> caused by deposits. You see, octane defines a gasoline's
> ignition point in a perfect world, with low octane gasoline
> igniting at lower temperatures and pressure than high octane
> gasolines do. But in the real world, deposits create hot spots
> that cause gasoline — of even the highest octane — to ignite
> prematurely and knock. Intake valve deposits soak up fuel like
> sponges, which disturbs the precise air-fuel ratio, again
> leading to poor performance and sometimes knock.
>
> But wait a minute. Isn't gasoline treated with detergents to
> control fuel system deposits? It sure is. But only at a treat-
> level that controls severe driveability problems, not garden
> variety knock. In fact, deposits begin forming immediately even
> with refinery-treated gasoline. The only way to combat them is
> with additional gasoline treatment.
>
> That's why motorists need AMSOIL Performance Improver Gasoline
> Additive. Performance Improver (PI) inhibits the tendency of
> gasoline to form fuel system deposits. Nothing works better — or
> safer — than AMSOIL PI.
>
> What makes PI better than other gasoline additives? PI keeps
> the entire fuel system clean, from combustion chamber to fuel
> injectors or carburetor. Clean injectors and carburetors deliver
> their full load of gasoline in a fine spray. The full load of
> gasoline keeps the gasoline-air ratio from becoming too lean,
> that is, too much air for the amount of gasoline available. When
> combustion occurs in an environment with too much air, the
> combustion event is hotter than it would be in an environment
> without excess air. That heat encourages knock. By keeping
> injector orifices clean, PI allows delivery of a full charge of
> gasoline to the combustion chamber.
>
> The fine mist of gasoline ensures a pattern of uniform small
> gasoline droplets. The smaller the fuel droplet, the more
> readily and fully it combusts, which also aids performance and
> inhibits knock.
>
> Here's an added bonus. The more readily and fully the gasoline
> combusts, the lower the exhaust emissions and the better the
> fuel economy. Many grateful PI users have written to say that PI
> helped them pass emissions tests, saving them money on fines and
> repairs.
>
> What about safety? Aren't all fuel system additives alike? They
> are not. Some contain chemistries that, even at low treat rates,
> cause motor oil to sludge and thicken. In fact, recently, oil
> companies, testing facilities and fuel and oil additive makers
> have put two and two together and realized the sporadic cases of
> oil sludging and thickening they've been seeing for the past few
> years have been caused by gasoline additive chemistries. Some of
> the very severe cases of oil sludging and thickening led to
> engine failure. Gasoline fuel additive and motor oil
> compatibility is a serious issue. Don't risk your engine!
>
> AMSOIL PI uses a chemistry that's been proven compatible with
> motor oil through extensive testing and billions of on-road
> miles. It's been on the market and continuously upgraded for
> more than two decades. There's no question about its safety when
> used as directed. Just remember, more is not always better, and
> this applies to AMSOIL PI
>
> It's a safe bet you'll love the power and performance you get
> with AMSOIL Performance Improver.
>
> You can order AMSOIL PI in 16 oz. bottles which will treat up to
> 160 gallons of gasoline for $7.85. Simply use the link below:
>
> https://kookiejar.net/~goesecure/web_store/quikstore.cgi?keywords=PCV
>
> Bob. Southern Ontario, Canada.
> '97 FR CC Sport, 5.2L, 3.55 SG, auto.
> Racing weight: 4,350lb ET: 14.934 Trap speed: 90.78 mph
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