Making the switch to e85, do I still want to run meth?
12-25-2015, 02:34 PM
#3
TECH Resident
If your E85 is like ours in PA, you may want to verify the ethanol content. If we get over E70, it's a surprise. If you're running "race" or verified E85, I don't think you'd need it.
12-26-2015, 08:15 PM
#7
The knock threshold difference between 70% and 85% ethanol is VERY little. Most builds would notice little difference between the two. Guys making 1000+ at the wheels on E50 @ 10:1 with basic LS setups. IMO there's no reason to not run water/meth injection with e85 if it's already installed. I'd suggest a smallish nozzle (5-7gph) with 50/50 to help cool the CC. It's cheap added insurance.
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12-29-2015, 02:12 PM
#13
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The knock threshold difference between 70% and 85% ethanol is VERY little. Most builds would notice little difference between the two. Guys making 1000+ at the wheels on E50 @ 10:1 with basic LS setups. IMO there's no reason to not run water/meth injection with e85 if it's already installed. I'd suggest a smallish nozzle (5-7gph) with 50/50 to help cool the CC. It's cheap added insurance.
12-29-2015, 03:00 PM
#15
A very well known university did the study and published it. It's been a while since I've read it, I'll try to find it again. They used variable compression ratio pistons and tested knock threshold at different ethanol percentages. Detonation threshold was not linear and results lessened over 50% or so.
We rarely get over 70% here in KS, I run it alot.
We rarely get over 70% here in KS, I run it alot.
Last edited by Forcefed86; 12-29-2015 at 03:39 PM.
12-29-2015, 03:59 PM
#17
It is interesting to note that the blending response of RON
and MON as a function of ethanol content is highly nonlinear.
There is a substantial octane improvement between
Regular Gas (RG) and E10, and between E10 and E50. However, between E50 and E85 there is very little difference in either RON or
MON. It is well-established that properties of ethanol gasoline
blends, such as Reid vapor pressure, do have nonlinear responses.
and MON as a function of ethanol content is highly nonlinear.
There is a substantial octane improvement between
Regular Gas (RG) and E10, and between E10 and E50. However, between E50 and E85 there is very little difference in either RON or
MON. It is well-established that properties of ethanol gasoline
blends, such as Reid vapor pressure, do have nonlinear responses.
Goes in depth in the link below.
http://www.nav200.delphi.com/pdf/tec...10-01-0619.pdf
Last edited by Forcefed86; 12-29-2015 at 04:10 PM.
