Speed-Talk is running on www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Sunoco Green E15 fuel

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Post Reply
gramps
Member
Member
Posts: 83
Joined: Fri Jan 23, 2009 7:16 am
Location:

Sunoco Green E15 fuel

Post by gramps »

This fuel is highly oxygenated compared to most other fuels. 650 Holley set up for Sunoco Standard. Now required to run the Green E15, water temps up to 240 with this fuel. Due to the high oxygen content percentage I feel we are running lean. Any idea of the oxygen percentage number or jetting change amount? Have a call and email into Sunoco but haven't heard back yet.
David Redszus
Guru
Guru
Posts: 7970
Joined: Tue Nov 27, 2007 9:27 am
Location: Chicago
Contact:

Re: Sunoco Green E15 fuel

Post by David Redszus »

gramps wrote: Thu Jul 30, 2020 9:42 am This fuel is highly oxygenated compared to most other fuels. 650 Holley set up for Sunoco Standard. Now required to run the Green E15, water temps up to 240 with this fuel. Due to the high oxygen content percentage I feel we are running lean. Any idea of the oxygen percentage number or jetting change amount? Have a call and email into Sunoco but haven't heard back yet.
Using an E15 fuel with ethanol as the oxygenate we find:

Oxygenate = 15%
Oxygen content = 35%
Fuel ratio = 9%
Oxygen increase to engine = 0.4725%

That very, very small amount of oxygen is not likely to shift to a lean condition.
More likely is the problem of not adjusting mixture to compensate for the change in stoich value.
Warp Speed
Guru
Guru
Posts: 3069
Joined: Wed Jun 25, 2008 1:46 pm
Location: NC

Re: Sunoco Green E15 fuel

Post by Warp Speed »

gramps wrote: Thu Jul 30, 2020 9:42 am This fuel is highly oxygenated compared to most other fuels. 650 Holley set up for Sunoco Standard. Now required to run the Green E15, water temps up to 240 with this fuel. Due to the high oxygen content percentage I feel we are running lean. Any idea of the oxygen percentage number or jetting change amount? Have a call and email into Sunoco but haven't heard back yet.
Going up 5 jet sizes is needed to compensate for the change in fuel.
David Redszus
Guru
Guru
Posts: 7970
Joined: Tue Nov 27, 2007 9:27 am
Location: Chicago
Contact:

Re: Sunoco Green E15 fuel

Post by David Redszus »

Warp Speed wrote: Thu Jul 30, 2020 2:43 pm
gramps wrote: Thu Jul 30, 2020 9:42 am This fuel is highly oxygenated compared to most other fuels. 650 Holley set up for Sunoco Standard. Now required to run the Green E15, water temps up to 240 with this fuel. Due to the high oxygen content percentage I feel we are running lean. Any idea of the oxygen percentage number or jetting change amount? Have a call and email into Sunoco but haven't heard back yet.
Going up 5 jet sizes is needed to compensate for the change in fuel.
If we were to add an oxygenate, such as ethanol, then it would be necessary to increase jet size.

But, many oxygenated fuels have a stoich value close to that of non-oxygenated fuels and therefore would not require larger jetting. Check the stoich value of the fuel you are using.
Warp Speed
Guru
Guru
Posts: 3069
Joined: Wed Jun 25, 2008 1:46 pm
Location: NC

Re: Sunoco Green E15 fuel

Post by Warp Speed »

David Redszus wrote: Thu Jul 30, 2020 4:33 pm
Warp Speed wrote: Thu Jul 30, 2020 2:43 pm
gramps wrote: Thu Jul 30, 2020 9:42 am This fuel is highly oxygenated compared to most other fuels. 650 Holley set up for Sunoco Standard. Now required to run the Green E15, water temps up to 240 with this fuel. Due to the high oxygen content percentage I feel we are running lean. Any idea of the oxygen percentage number or jetting change amount? Have a call and email into Sunoco but haven't heard back yet.
Going up 5 jet sizes is needed to compensate for the change in fuel.
If we were to add an oxygenate, such as ethanol, then it would be necessary to increase jet size.

But, many oxygenated fuels have a stoich value close to that of non-oxygenated fuels and therefore would not require larger jetting. Check the stoich value of the fuel you are using.
Green E15 is 15% Ethenol. It is the same fuel currently used in Nascar Cup series. We have made this same switch that the OP is referring to, and a plus 5-7 jet sizes is what is needed to compensate.
Post Reply