Go Back   The Supercar Registry > General Discussion > Technical & Restoration


Reply
 
Thread Tools Display Modes
  #11  
Old 01-01-2023, 05:06 PM
Lee Stewart's Avatar
Lee Stewart Lee Stewart is offline
Senior Member
 
Join Date: Mar 2017
Location: ABQ, New Mexico
Posts: 36,633
Thanks: 3,506
Thanked 136,486 Times in 22,778 Posts
Default

What about the fact that AV Gas contains lead while Gasoline doesn't?
Reply With Quote
  #12  
Old 01-01-2023, 08:10 PM
JRSully JRSully is offline
Yenko Contributing Member
 
Join Date: Dec 2002
Location: Long Island
Posts: 2,330
Thanks: 0
Thanked 318 Times in 155 Posts
Default

It does have small amount of lead (which will destroy cat converters if equipped). Although you have 11:1 compression, you have to figure in timing (if deviating from stock) as well. This could cause an increase in detonation, requiring more octane
__________________
70 L78 Nova Fathom Blue,Bench, 4spd, F41, 3:55
71 Porsche 911 Targa
Reply With Quote
  #13  
Old 01-02-2023, 01:16 AM
1971ls6's Avatar
1971ls6 1971ls6 is offline
Senior Member
 
Join Date: Mar 2011
Location: Michigan
Posts: 190
Thanks: 15
Thanked 75 Times in 51 Posts
Default

I used to mix it 50/50 with 93, now I run it straight and have a carb set up for it when I go to the track, I use another carb and 93 on the street
__________________
1969 ZL1 COPO Camaro 11.60@120 F.A.S.T 21
1971 LS6 vette 12.20 @118 PSMCDR
Reply With Quote
The Following User Says Thank You to 1971ls6 For This Useful Post:
MarcDant (01-02-2023)
  #14  
Old 01-02-2023, 10:33 PM
turbo69bird's Avatar
turbo69bird turbo69bird is offline
Senior Member
 
Join Date: Sep 2005
Location: Here
Posts: 254
Thanks: 93
Thanked 562 Times in 129 Posts
Default

Quote:
Originally Posted by sixt9rsx33 View Post
I am at sea level and based on what you guys have said above, I think it was more of a carb setup issue for this fuel. You guys confirmed too that once I added the pump 93 things straightened out. Compression is 11.1 so may have enough compression? Can't answer that one.
Highly unlikely, I’m a pilot as well as a racer , I’ve used AV gas in many race cars and even some of my street cars at the track never had an issue like that. I’d guess you had some crap in the tank that made its way to the needle and seat and hung it open causing a nasty rich condition from the vent tubes flowing fuel out the top. Holley? ( just a guess but common)

For those running AV gas 100LL now stock up cause it’s going away very soon. The new unleaded AV gas has been approved. Pilots are not happy about the change over I can tell you that but 100LL despite its name actually has a lot of lead in it. So it’s gone.

Keep in mind that Aviation engjnes run at about 2600 rpm’s and this fuel is designed to run that RPM sustained more than 1000 to 6000 Rpms that being said it’s always run well for my cars and lots of landscaping equipment without changes.

Many lycoming engines running av gas are low 7.9 compression. Sometimes as low as 7.0! Big bore engines.

Last edited by turbo69bird; 01-02-2023 at 10:43 PM.
Reply With Quote
  #15  
Old 01-02-2023, 10:42 PM
turbo69bird's Avatar
turbo69bird turbo69bird is offline
Senior Member
 
Join Date: Sep 2005
Location: Here
Posts: 254
Thanks: 93
Thanked 562 Times in 129 Posts
Default

Thought some of you may enjoy this read about AV gas and of course none of us use AV gas on the street because that would be illegal. This information on AV gas is for off-road / track purposes only

https://www.aviationsafetymagazine.c...urn-baby-burn/
Reply With Quote
The Following 2 Users Say Thank You to turbo69bird For This Useful Post:
169indy (01-03-2023), 69M22Z (01-02-2023)
  #16  
Old 01-03-2023, 09:33 AM
RALLY RALLY is offline
Yenko Contributing Member
 
Join Date: Feb 2008
Location: MI
Posts: 990
Thanks: 19
Thanked 145 Times in 101 Posts
Default

Quote:
Originally Posted by turbo69bird View Post
Highly unlikely, I’m a pilot as well as a racer , I’ve used AV gas in many race cars and even some of my street cars at the track never had an issue like that. I’d guess you had some crap in the tank that made its way to the needle and seat and hung it open causing a nasty rich condition from the vent tubes flowing fuel out the top. Holley? ( just a guess but common)

For those running AV gas 100LL now stock up cause it’s going away very soon. The new unleaded AV gas has been approved. Pilots are not happy about the change over I can tell you that but 100LL despite its name actually has a lot of lead in it. So it’s gone.

Keep in mind that Aviation engjnes run at about 2600 rpm’s and this fuel is designed to run that RPM sustained more than 1000 to 6000 Rpms that being said it’s always run well for my cars and lots of landscaping equipment without changes.

Many lycoming engines running av gas are low 7.9 compression. Sometimes as low as 7.0! Big bore engines.
I never had any problems using straight AV gas years back. My Chevelle ran just find.
Reply With Quote
  #17  
Old 01-03-2023, 10:42 AM
JRSully JRSully is offline
Yenko Contributing Member
 
Join Date: Dec 2002
Location: Long Island
Posts: 2,330
Thanks: 0
Thanked 318 Times in 155 Posts
Default

I do run a 50/50 93/AvGas mix in my old 911, has a 9:1 ratio, but high RPM. It runs VERY well on this fuel set up
__________________
70 L78 Nova Fathom Blue,Bench, 4spd, F41, 3:55
71 Porsche 911 Targa
Reply With Quote
  #18  
Old 01-04-2023, 01:33 AM
ban617 ban617 is offline
Senior Member
 
Join Date: Dec 2010
Location: ohio
Posts: 433
Thanks: 5
Thanked 14 Times in 14 Posts
Default

I ran it with Sunoco Ultra 94 … Had good results…
Reply With Quote
  #19  
Old 01-04-2023, 03:20 PM
oldstv oldstv is offline
Yenko Contributing Member
 
Join Date: Jan 2022
Posts: 90
Thanks: 1
Thanked 22 Times in 19 Posts
Default

I had a higher compression Buick and it would ping like crazy on regular 93, putting 5 gallons of av gas to a tank eliminated the ping and never an issue with the carb.
I also ran it in my outboard drag boat with zero issues. I was told that the rating of 100 octane was a min rating and it could see higher numbers.
Reply With Quote
  #20  
Old 01-06-2023, 02:28 AM
sixt9rsx33 sixt9rsx33 is offline
Yenko Contributing Member
 
Join Date: Jul 2008
Location: NC
Posts: 1,243
Thanks: 48
Thanked 495 Times in 145 Posts
Default

Quote:
Originally Posted by turbo69bird View Post
Highly unlikely, I’m a pilot as well as a racer , I’ve used AV gas in many race cars and even some of my street cars at the track never had an issue like that. I’d guess you had some crap in the tank that made its way to the needle and seat and hung it open causing a nasty rich condition from the vent tubes flowing fuel out the top. Holley? ( just a guess but common)

For those running AV gas 100LL now stock up cause it’s going away very soon. The new unleaded AV gas has been approved. Pilots are not happy about the change over I can tell you that but 100LL despite its name actually has a lot of lead in it. So it’s gone.

Keep in mind that Aviation engjnes run at about 2600 rpm’s and this fuel is designed to run that RPM sustained more than 1000 to 6000 Rpms that being said it’s always run well for my cars and lots of landscaping equipment without changes.

Many lycoming engines running av gas are low 7.9 compression. Sometimes as low as 7.0! Big bore engines.
Perhaps there was trash in the needle and seat that I picked up from the hand held gas tank? I am familiar with the issues that trash causes in a needle and seat and my issue did appear that was the problem. I was of the mind set that I was going to have to pull the carb and clean it. But when I put the 93 in the tank and ran the engine up to 5K twice things started getting better? Perhaps I was just lucky and cleared the trash? Right now the car is running like a top and I love the smell of the AV gas.
Here in Sarasota County I can get Sunoco 90 and 100 octane non ethanol at the pump. Will likely just use that simply because of ease of filling the tank. Prior to the AV gas this is what I was running, but just wanted to try the AV Gas.
__________________
65 Corvette Coupe L78
67 427/390 Vette Coupe unrestored
67 L-79 Vette roadster (Top Flight)
69 L71 Roadster Survivor
69 L46 Roadster Survivor (Sold)
69 Z/28 RS
69 Dodge Charger R/T
70 W30 442 Auto Air Survivor
2016 Z06 Coupe M7
70 AAR Cuda (Sold)
69 L78 Chevelle
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 08:19 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.

O Garage vBulletin Plugins by Drive Thru Online, Inc.