93 octane in Denver? - F-Body Road Racing and Autocross Forums

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35th_Anniversary... 35th_Anniversary_AS_Camaro_SS View Member Profile	Dec 14 2005, 01:42 AM Post #2
Chapter 11 Racing Group: Advanced Members Posts: 1,166 Joined: 15-February 04 From: Houston, Republic of Texas Member No.: 207	the lower compression ratio is really a misnomer. The valves always open and close at the same time thanks to our camshaft. Because atmospheric pressure is lower the pressure inside the cylinder when the sparkplug ignites is also lower. Octane isn't needed for "higher compression ratio" engines, but those with a certain internal cylinder pressure. The compression ratio on most GM vehicles with superchargers is very low, but they still require premium gasoline to prevent detonation / early combustion. right?

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35th_Anniversary_AS_Camaro_SS 93 octane in Denver? Dec 13 2005, 04:07 AM

Rob Hood I didn't think they had that high of octane at... Dec 13 2005, 06:00 AM

Sam Strano Lat time I was there 91 was it because of the alti... Dec 13 2005, 06:02 PM

trackbird Thinner air reduces the filling of the cylinders, ... Dec 13 2005, 06:16 PM

35th_Anniversary_AS_Camaro_SS Yeah, but with a "mass" airflow sensor d... Dec 13 2005, 10:59 PM

trackbird QUOTE (35th_Anniversary_AS_Camaro_SS @ Dec 13... Dec 13 2005, 11:22 PM

35th_Anniversary_AS_Camaro_SS the lower compression ratio is really a misnomer. ... Dec 14 2005, 01:42 AM

trackbird Right. We are actually discussing dynamic compress... Dec 14 2005, 03:22 AM

00 SS I've never gone through all the thermochemistr... Dec 14 2005, 04:26 PM

trackbird QUOTE (00 SS @ Dec 14 2005, 11:26)Maybe you g... Dec 14 2005, 05:41 PM

00 SS Interesting. I thought the vapor pressure determi... Dec 14 2005, 06:11 PM

trackbird QUOTE (00 SS @ Dec 14 2005, 13:11)Interesting... Dec 14 2005, 06:54 PM

00 SS QUOTE (Rob Hood @ Dec 13 2005, 00:00)I didn... Dec 14 2005, 08:29 PM

trackbird QUOTE (00 SS @ Dec 14 2005, 15:29)The bottom ... Dec 14 2005, 08:59 PM

35th_Anniversary_AS_Camaro_SS I'll run whatever Danny Popp says is okay.... ... Dec 14 2005, 10:31 PM

00 SS QUOTE (35th_Anniversary_AS_Camaro_SS @ Dec 14... Dec 14 2005, 10:39 PM

Spectator I thought higher octane fuel actually had slightly... Dec 14 2005, 11:09 PM

pknowles QUOTE How often you you ever get knocking in moder... Dec 14 2005, 11:13 PM

pknowles QUOTE I thought higher octane fuel actually had sl... Dec 14 2005, 11:17 PM

Spectator I understand that. I'm talking about the actua... Dec 14 2005, 11:23 PM

35th_Anniversary_AS_Camaro_SS QUOTE (00 SS @ Dec 14 2005, 16:39)Correct, bu... Dec 14 2005, 11:39 PM

CMC#5 hehe so then why is the max octane in Ca 91 not 93... Dec 16 2005, 04:57 AM

trackbird QUOTE (CMC#5 @ Dec 15 2005, 23:57)hehe so the... Dec 16 2005, 05:31 AM

35th_Anniversary_AS_Camaro_SS I was thinking it could be something about emissio... Dec 16 2005, 06:09 AM

trackbird QUOTE (35th_Anniversary_AS_Camaro_SS @ Dec 16... Dec 16 2005, 01:21 PM

CMC#5 So you think the CARB (Cal Air Resource Board) is ... Dec 16 2005, 10:10 PM

trackbird QUOTE (CMC#5 @ Dec 16 2005, 17:10)So you thin... Dec 16 2005, 11:12 PM

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35th_Anniversary... 35th_Anniversary_AS_Camaro_SS View Member Profile	Dec 13 2005, 04:07 AM Post #1
Chapter 11 Racing Group: Advanced Members Posts: 1,166 Joined: 15-February 04 From: Houston, Republic of Texas Member No.: 207	seems like stupid question, but Topeka sure as heck didn't have any 93.