What type of gas in a stock 305?
- Thread starter LukeZ
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Built GN tuned for higher octane and LS3 get the good stuff. Daily driver 2014 Nissan Murano and extra Cutlass with a 307 get the cheap stuff. Especially a stock 305. That should run forever on sludge.
Also a good reason to keep the EVAP system so your tank stays closed vented. It helps keep moisture out of your tank, while old fashioned open venting lets all the moisture into your tank and sludge it right up.
ethanol fuel comes with water in it and as you use the gas the tank still draws in air but it doesn't vent the fumes to the atmoshere
I . . thought that the ethanol in the gas would actually slightly increase the octane rating, given ethanol's natural octane rating of 99 or 100 or so... but don't hold me to that.
it does but you get more BTU with gas than than you do with ethanol so you lose power and fuel mileage with the ethanol added. If you talk with anyone running e85 they'll tell you they lose about 30% mpg and for power it's like dragging a parachute around
It is a catch-22. The truth lies in the detail that most ignore, don't know or don't care about for simplicity or to sell an idea. Ethanol works very well in high compression, supercharged, and turbo vehicles. In N/A emission controlled low compression engines ethanol causes loss of efficiency due to it's lower BTU rating. As Ethanol percentage rises this effect grows and engine performs worsens. FFV's(E85) OEM vehicles also have this issue because they must run the entire spectrum of ethanol blends from 0% to 85% so the engines the factory builds are a compromise on all fronts. Also can be problematic in cars built before 1980 due to ethanol's corrosive nature.
Now flip the coin and build an engine that takes advantage of ethanol's properties and you can make great power and efficiencies similar to straight gas.
To the original poster E10 or straight gas will run fine in a 305. The 87 is usually a low quality straight fuel and the 89 is a E10 blend. At least that is what my area typically is. If you are not building power and it is an emission controlled engine not much difference.
Now flip the coin and build an engine that takes advantage of ethanol's properties and you can make great power and efficiencies similar to straight gas.
To the original poster E10 or straight gas will run fine in a 305. The 87 is usually a low quality straight fuel and the 89 is a E10 blend. At least that is what my area typically is. If you are not building power and it is an emission controlled engine not much difference.
Ah, ok, so if the concern is potential pinging/detonation, then the ethanol will help in small amounts, but the lesser energy in it (and I understand that with 100% ethanol, the air-fuel ratio should be approximately twice as rich as what it is with gasoline) will reduce power.
So, at 10% ethanol, you wind up with the "87" octane being effectively about 88-ish octane
So, at 10% ethanol, you wind up with the "87" octane being effectively about 88-ish octane
The air fuel mixture is richer with real gas than with e10. I have a wide band gauge that confirmed that
No straight ethanol is the opposite. For the same volume or weight of fuel, ethanol runs 1.5 times as lean as gasoline or around 2/3 as rich. This would obviously most likely lead to detonation in any engine with even moderate compression. Similarly, E85 would run ~1.39 times as lean or 71.9% as rich.
Here is a helpful link. Scroll down to the table with the gasoline equivalent weights of E10 and other alternative fuels.
https://en.m.wikipedia.org/wiki/Gasoline_gallon_equivalent
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