AudiWorld Forums: I thought Octane was basicaly...

2008: Audi Year in Review

Long Term Garage: 2009 A5 3.2 quattro S-line

Bound for Detroit: Audi R8 V10 Breaks Cover

[Thread] [Post Followup] [Post Picture] [Search Forums] [Performance and Tuning]

I thought Octane was basicaly...

Posted by: Justin517 on 2006-06-09 08:19:21
Account #: 60006

In Reply to: Who knows the difference in heat content (BTU/gal) between 87 and 93 octane pump gas? TIA posted by VonK :: Retired on 2006-05-23 08:17:59

resistance to burning, or in effect... a higher flash point.
higher octane actualy resists burning longer, hence the use in high compression and/or high boost applications to resist knocking or ping.
and also requires or is aided by a high energy ignition system.
I may be talking about a completely differnt issue or aspect of gasoline, but thats my .02

-Justin -AIM: JWR517-

July 31st 2003 @ 10:23:51... It all started going downhill.

Why to NevAr get Married!

Myspace

My 20vT Megasquirt/Holset coupe project SOLD!

My 1997 A4 1.8TQMS is totaled as of 10/7/06
1992 GTI 8v...selling
2003 Pathfinder SE

Thread:

Who knows the difference in heat content (BTU/gal) between 87 and 93 octane pump gas? TIA - VonK :: Retired 2006-05-23 08:17:59 (129 views)

Here are two charts I came across that appear to answer my question. ---> - VonK :: Retired 2006-06-12 09:00:59 (219 views)

I thought Octane was basicaly... - Justin517 2006-06-09 08:19:21 (141 views)

(Edited) Actually, two fuel properties play a significant role in knock/ping prevention: ..... - VonK :: Retired 2006-06-10 09:48:28 (128 views)

I've read that today, typically less expensive additives like ethanol and mtbe are added - Yippers® 2006-06-10 19:29:25 (121 views)

It's obvious that I'm not a chemist. ;) ---> - VonK :: Retired 2006-06-11 20:55:37 (89 views)

little or none. octane rating is not a measure of energy content or burning temp. - Morgoth 2006-05-26 13:03:42 (100 views)

I know that, but however little, there's still a difference. - VonK :: Retired 2006-05-26 19:40:19 (94 views)

here are some although i've seen regular listed at 124K in other places.... - Morgoth 2006-05-27 00:26:48 (112 views)

I think they transposed the values for the octanes. Most everything I've read shows a - Yippers® 2006-06-01 21:09:01 (103 views)

your link only deals with rfg. looks like they're using regular as their base...... - Morgoth 2006-06-02 22:51:54 (80 views)

The regular (conventional) energy / gallon is what I was addressing. That was just one of the first - Yippers® 2006-06-03 00:16:11 (104 views)

Just what the doctor ordered! Thanks. :) - VonK :: Retired 2006-05-27 07:57:00 (127 views)

i've never found any increase with higher octane number.... - Morgoth 2006-05-27 10:55:36 (118 views)

Better SO2 than HS2. :) Did you have a new cat? - VonK :: Retired 2006-05-27 12:25:18 (83 views)

could have been that too. no new cat and this happened several times. - Morgoth 2006-05-27 18:16:51 (71 views)

unless you are trying to roast marshmellows... why? - WJM 2006-05-26 06:14:18 (113 views)

I'm well aware of the influence factors you mentioned, but I guess my question still stands. - VonK :: Retired 2006-05-26 07:41:37 (119 views)

You must be registered and logged in to post. Please select an option: