Yeah, but I would hardly call 91 a premium fuel. I was meaning the 104
race fuels.
I guess the whole compression ratio wasnt explained to me quite right. I
was under the impression it depended on the combustion chamber only.
-- Gary Hedlin President Hedlin Web Designs http://www.hedlin.net ""Bernd D. Ratsch"" <bernd@texas.net> wrote in message news:000001c325d9$329ce5a0$090aa8c0@homenet.com... > > Forgot to add... > > Easy explanation - Higher Octane Fuel burns slower therefore requiring > the "spark" to ignite the air/fuel mixture at a quicker (or sooner) > rate. If you advance the timing, you can accomplish this. > > Example: > 87 Octane = 12 Degrees BTDC > 91 Octane = 14 Degrees BTDC (Ignition occurs sooner to accommodate for > the slightly longer burn rate of the higher octane fuel - makes a few > more ponies as well if it occurs at the correct time) > > Now in response to the 100 octane race fuel making a vehicle run > faster....it's quite possible but you need to remember that race fuel > isn't pump gas with a can of "104" octane booster. The blend is quite > different and, in most cases, a lot "cleaner" than pump fuel. > > - Bernd > > -----Original Message----- > From: owner-dakota-truck@bent.twistedbits.net > [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bernd D. > Ratsch > Sent: Thursday, May 29, 2003 5:32 AM > To: dakota-truck@dakota-truck.net > Subject: RE: DML: Re: RE: Re: Superchips Dyno Results > > > > Sorry to say Gary, but simple changes in Ignition Timing can require the > use of higher octane fuel. It's an old trick as well - change initial > and overall timing curve (recurving a distributor) and grab the next > higher grade of fuel (did this on my old '69 AMC). Works wonders. :) > > Compression is just one of the factors. You can run a 10:1 engine on > pump gas with the correct timing curve. > > - Bernd > > -----Original Message----- > From: owner-dakota-truck@bent.twistedbits.net > [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Gary > Hedlin > Sent: Wednesday, May 28, 2003 11:07 PM > To: dakota-truck-moderator@bent.twistedbits.net > Subject: Re: DML: Re: RE: Re: Superchips Dyno Results > > > > Sorry to bust everyones bubble, but theres NO WAY pcm programming alone > can allow a vehicle to use premium fuel efficiently. Yes it can be set > in the PCM, but the stock compression ratio works the best with 87. So > unless you've done work on the heads and pistons, you cannot increase > the compression ratio, or run premium fuel efficiently. Not even having > a bigger TB will help, just increase the ammount of fuel needed. > > -- > Gary Hedlin > > > >
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