octane booster

[Bob McElroy]

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From: 	gofast at ix.netcom.com[SMTP:gofast at ix.netcom.com]
Sent: 	Tuesday, January 07, 1997 8:50 AM
To: 	DIY_EFI at coulomb.eng.ohio-state.edu
Subject: 	octane booster

Hi guys. I *think* I am running out of octane in my BMW 530i - I have =
high=20
compression pistons, and the car is choking at high rpms. Have checked =
most of=20
the obvious things like fuel pressure, filter, etc.

_____________________
As I read this post, I came to the conclusion that the problem should =
not be insufficient octane level.  If octane is insufficient, the =
vehicle should make a pinging or knocking noise.  The problem as =
described is "choking at high rpms."  The last thing I would suspect is =
the fuel octane rating.  Several posts seemed to imply that increasing =
fuel octane rating alone would solve the problem of "choking at high =
rpms" and increase engine power.  While I certainly don't mean to imply =
that I am an expert, I would tend to disagree with the fuel octane =
diagnoses.

I would have to have more information before I would be comfortable to =
guess at a cause. Things like: Did you make any changes whatsoever to =
the engine just before the problem occurred?  Under what circumstances =
(light/heavy load, cold/hot engine, low/high engine speed, etc.) does =
the problem occur?  Has the engine been serviced/tuned (good =
sparkplugs/wire, good distributor or whatever, correct timing, idle =
speed/mixture etc.) recently? etc.  The general condition of the engine =
should be observed also: Is there excessive grease/oil/gunk somewhere =
that wasn't there a couple of weeks ago?  Is the air intake system free =
of debris and have a clean air filter?  Are any of the mechanical =
linkages for the throttle or other engine components =
wore/loose/missing/broken/etc?

Well, it looks as if I have no magic solutions for you, just my opinion =
which is worth only as much as you paid me for it.

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"Two things are infinite, the universe and human stupidity"
"When everyone is in agreement, it signifies that no one thought very =
hard."
							       - Albert Einstein

Bob McElroy
Manufacturing Engineer
Midcom, Inc.
Waverly, IA
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