[C1] Fuel perc temp
Thread Starter
Instructor
Joined: Mar 2023
Posts: 206
Likes: 76
From: San Joaquin Valley, CA
2024 C1 of the Year Finalist - Unmodified
2023 C1 of the Year Finalist - Unmodified
Fuel percolation temperature
If this question is unanswerable, ignorant, or simply uninformed, please accept my apologies.
I have a ‘62 fuelie, and am aware of the fuel percolation issue. I live in California and run unleaded 91 octane pump gas; that’s the best we can get without resorting to race gas.
At what ambient temperature does the perc problem begin to manifest itself, or put another way, at what max ambient temp is it safe to take the old girl out without having to worry about percolation?
Thank you for your time and assistance.
I have a ‘62 fuelie, and am aware of the fuel percolation issue. I live in California and run unleaded 91 octane pump gas; that’s the best we can get without resorting to race gas.
At what ambient temperature does the perc problem begin to manifest itself, or put another way, at what max ambient temp is it safe to take the old girl out without having to worry about percolation?
Thank you for your time and assistance.
Last edited by dryak; Sep 12, 2023 at 07:59 PM.
Race Director
Joined: Feb 2007
Posts: 15,470
Likes: 8,951
From: northern california
C2 of Year Finalist (track prepared) 2019
Dry,
We have to endure two different fuels here in the Peoples' Republik of Kalifornia. Our "winter blend" fuel will exhibit fuel perc at temps in the range of 105*F nozzle temp which can happen at ambient temps as low as 65*F. Our "summer blend" fuel resists perc up to 135*F - 140*F, which is still below normal engine operating temps but in the range of ambient temps around 85*F.
Unlike with carbureted engines, with FI engines, such issues do have solutions. See postingw #5 and #7 in his CF thread:
FI fuel perc:
Contact me privately for additional details.
We have to endure two different fuels here in the Peoples' Republik of Kalifornia. Our "winter blend" fuel will exhibit fuel perc at temps in the range of 105*F nozzle temp which can happen at ambient temps as low as 65*F. Our "summer blend" fuel resists perc up to 135*F - 140*F, which is still below normal engine operating temps but in the range of ambient temps around 85*F.
Unlike with carbureted engines, with FI engines, such issues do have solutions. See postingw #5 and #7 in his CF thread:
FI fuel perc:
Contact me privately for additional details.
