#3666 - 05/07/1202:21 PMRe: MITTY ENTRY LIST
[Re: JFW]
zuzulo56
Legend
Registered: 04/25/11
Posts: 1729
Loc: Hollywood
Racing Gasoline Verses Aviation Gasoline written by Tim Wusz, ConocoPhillips Company
I am going to attempt to address the controversy of aviation gasoline verses racing gasoline for use in race cars. Some racers use aviation gasoline which is fine for some applications but does have shortcomings. There are several grades of aviation gasoline (avgas) that we must identify before going any farther. 1. Avgas 80/87: this product is used in low compression ratio aircraft engines, contains little or no lead, is red in color, and should not be used in any automotive engine due to a low motor octane number of about 80.
2. Avgas 100/130: this product that can be used in some automotive engines. It has both research and motor octane numbers slightly over 100. Avgas 100/130 is green in color, contains four grams of lead per gallon, and is becoming harder to find. 3. Avgas 100 LL: the LL stands for "low-lead" which means two grams per gallon, low compared to the avgas 100/130 that it was designed to replace. It has research and motor octane numbers very similar to the 100/130 product previously discussed. The color is blue. This product sometimes has a high level of aromatics which can contribute to lazy throttle response and dissatisfaction of the consumer. 4. Avgas 115/145: this product was developed for high performance piston aircraft engines used in world war II and in the Korean war. It is very hard to find anymore due to lack of demand although it is of very high octane quality. The color is purple. The remainder of this discussion will assume that our basis for comparison with racing gasoline is avgas 100/130 and/or 100 LL since they are both available and have acceptable octane quality for limited applications. When the word "avgas" is used, it will refer to avgas 100/130 or 100 LL.
Avgas is less dense than most racing gasolines. Instead of weighing about 6.1 to 6.3 pounds per gallon like racing gasoline, it weighs 5.8 to 5.9 pounds per gallon. The racer must compensate for this by changing to richer (larger) jets in the carburetor when changing from racing gasoline to avgas. The other major difference is octane quality. Avgas is short on octane compared to most racing gasolines. Many racing engines with "quick" spark advance curves or with no centrifugal advance have more spark advance at low rpm than avgas and some racing gasolines can handle. The result is detonation, especially during caution periods in circle track racing because all of the spark advance is "in", rpm is low, and part throttle air fuel ratios are too lean for the operating conditions. If the driver does not "work" the throttle back and forth, pistons can be "burned" which melts away part of the aluminum piston material. Inadequate octane quality is one of the quickest ways to destroy an engine. Pistons can be severely damaged during one acceleration where detonation is present and the racer may not know what is happening until it is too late. For maximum performance and power from a racing engine, racing gasoline will normally provide better performance than avgas. Avgas can be a good gasoline for some applications, but since most racers do not know the octane requirement of their engines, they would be better off with a "real" racing gasoline that will give them the overall resistance to detonation that they need to protect their investment. If someone has spent from $15,000 to $50,000 or more on their racing engine, it is foolish to cut corners on gasoline be sure you have a gasoline with adequate octane quality.
#3670 - 05/07/1205:23 PMRe: Post 2012 MITTY Video Clips.
[Re: V8vair]
zuzulo56
Legend
Registered: 04/25/11
Posts: 1729
Loc: Hollywood
Originally Posted By: V8vair
After getting the car up in the air tonight and checking out the damage it looks like the Corvair is done for a while. No money and a wrecked race car is bad combination. Mike
"The cost of racing hasn't increased in 70 years. Back then, it took everything you had. And it still does."
Edited by zuzulo56 (05/07/1205:24 PM)
_________________________
Hristos Anesti!...So, Be cool and play nice! VIMEO...at "Amélie Renoncule": https://vimeo.com/user11005302
#3678 - 05/07/1211:01 PMRe: Post 2012 MITTY Video Clips.
[Re: Glenn Stephens]
zuzulo56
Legend
Registered: 04/25/11
Posts: 1729
Loc: Hollywood
Originally Posted By: Glenn Stephens
I have two racecars. Is it ok to declare them as dependants?
Terribly Right & Proper, if'n you're dependent-On-Them to convey you on your adult beverage runs...which you can THEN, also, write off as a business expense! "Extrapolated Conveyance" it's called.
Edited by zuzulo56 (05/07/1211:04 PM)
_________________________
Hristos Anesti!...So, Be cool and play nice! VIMEO...at "Amélie Renoncule": https://vimeo.com/user11005302
#3691 - 05/09/1209:34 AMRe: Post 2012 MITTY Video Clips.
[Re: Hap Waldrop]
Video and Data Nut
Driver
Registered: 01/15/11
Posts: 208
Loc: Virginia International Raceway
Originally Posted By: Hap Waldrop
John, wow, thats alot of pics, thansk for sharing.
+1!
_________________________
-Peter Krause Professional Race Instruction and Coaching Data and Video Sales, Interpretation and Training "The Driver is the Greatest Performance Variable" www.peterkrause.net
zuzulo56
Legend
Registered: 04/25/11
Posts: 1729
Loc: Hollywood
Originally Posted By: TexasCorvette
Perfect!...and you seemed to REALLY "play nice" with those tyres. (But, if an observation I might make...the R.V. Mirror proved an annoyance, at times, viz-a-vie the position of the camera. The SAME problem that Ray Harroun at Indy 1911 would 'ave 'ad, IF he had a GoPro.)
Edited by zuzulo56 (05/11/1203:09 PM)
_________________________
Hristos Anesti!...So, Be cool and play nice! VIMEO...at "Amélie Renoncule": https://vimeo.com/user11005302
Previous Topic
Index
