 93 octane in Denver? |
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 Dec 13 2005, 04:07 AM
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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.
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Dec 13 2005, 11:22 PM
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FRRAX Owner/Admin Group: Admin Posts: 15,439 Joined: 13-February 04 From: Ohio Member No.: 196 |
QUOTE (35th_Anniversary_AS_Camaro_SS @ Dec 13 2005, 17:59) Yeah, but with a "mass" airflow sensor doesn't the stupid computer detect less mass per unit volume and reduce the amount of fuel going into the cylinders? Yes, but compression causes detonation. It's a function of peak pressure created when the piston is headed for top dead center. As you compress air, it heats up. If it is compressed enough, it can get hot enough to cause fuel (low octane) to ignite. This can be helped by hot spots in the chamber, carbon deposits, etc. However, if you only fill the cylinder half full, you will not see nearly the peak cylinder pressure during compression. Therefore, it doesn't matter how much fuel you've put in there (as long as the mixture is right). Less air = less pressure, less pressure = less temperature rise. Less temperature rise keeps you out of "trouble". Geez....why am I explaining this to engineers..... (IMG:http://www.frrax.com/rrforum/style_emoticons/default/rotf.gif) |
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Posts in this topic
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 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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