RE: fun with c16

["Fry, Larry" <LEF@chem-tronics.com>]

Joe-  
Aaron has touched on some basic truths: unless you have a
knock-sensor-equiped car, fuel of higher or lower octane will not change its
power output WITHOUT YOU CHANGING THE IGNITION TIMING FIRST, either to
utilize the higher octane or to let it run lower octane without detonation.
(not pre-ignition or "predetonation", which is a non-word)

Larry  sandiego16V

-----Original Message-----
From: Aaron Ness [mailto:aaron@makuta.com]
Sent: Thursday, October 25, 2001 10:57 AM
To: 'Joe Doty'; scirocco-l@scirocco.org
Subject: RE: fun with c16


I'm not trying to piss on your party, but I might do that.

When I was in school, one of the ME labs consisted of a measurement project
of our own choosing.  They put some restrictions on it, though - we had a
Superflow dyno and a 350, a F*&d 4-banger, and a Dodge truck V10 at our
disposal, and they said we couldn't test the effects of octane or Splitfire
plugs.  These had both been done many times in previous classes, and nobody
was able to realize a statistically significant difference in either case.
(My group ended up running the 350 with cooling water at 190 and 160 degrees
F and got a 1-2 hp gain.)

Is your timing advanced too far, causing the pinging?  That would
potentially result in more power when you move to something with higher
octane that is less likely to predetonate.  If the timing is set the same
and you don't have pinging, see if there is a measurable difference.  (Since
the placebo effect comes into play, the butt dyno isn't accurate enough for
this one.)

Aaron
'87 528e
'82 Scirocco
'70 Beetle
'82 GPz550


-----Original Message-----
From: owner-scirocco-l@scirocco.org
[mailto:owner-scirocco-l@scirocco.org]On Behalf Of Joe Doty
Sent: Thursday, October 25, 2001 12:16 PM
To: scirocco-l@scirocco.org
Subject: fun with c16


Yeah, I went and bought some 116 octane gas a while back just to see if it
would make any difference on my 2.0 16v.  It was like $40 for 5 gallons.  I
never ended up using it until today...after the normal fillup with Chevron
91 octane I was getting some crazy pinging under load.  So I figured I would
see what happened when I dumped a gallon of that stuff in there.  There was
only like 5 gallons of regular gas in there.  And man oh man, what a
difference!  When ambient temps are lower (55-60 deg), it pulls like mad!
The difference is less at higher temps but definitely still there.  Part
throttle in 2nd and 3rd OWNZ.

Joe

_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp


--
Email LIST problems to: scirocco-l-probs@scirocco.org.
To unsubscibe send "unsubscribe scirocco-l" in the message to
majordomo@scirocco.org


--
Email LIST problems to: scirocco-l-probs@scirocco.org.
To unsubscibe send "unsubscribe scirocco-l" in the message to
majordomo@scirocco.org


[Disclaimer]This e-mail is strictly confidential and intended solely for the
addressee. It may contain information which is covered by legal,
professional, or other privilege. If you are not the intended addressee you
must not use, disclose, or copy this transmission. This E-mail is not
intended to impose nor shall it be construed as imposing any legally binding
obligation upon GKN Aerospace Chem-tronics Inc. and/or any of its
subsidiaries or associated companies. Neither GKN Aerospace Chem-tronics
Inc. nor any of its subsidiaries or associated companies gives any
representation or warranty as to the accuracy or completeness of the
contents of this E-mail. GKN Aerospace Chem-tronics Inc. shall not be held
liable to any person resulting from the use of any information contained in
this E-mail and shall not be liable to any person who acts or omits to do
anything in reliance upon it.


--
Email LIST problems to: scirocco-l-probs@scirocco.org.
To unsubscibe send "unsubscribe scirocco-l" in the message to majordomo@scirocco.org