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More than 10% alcohol can cause a rough idle

 
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Old 08 Jun 2012, 12:13 am
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Question More than 10% alcohol can cause a rough idle

Hi
I just read that more than 10% alcohol in gas can cause a rough idle. Has anyone else heard the same?
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Old 08 Jun 2012, 01:10 am
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Default Re: More than 10% alcohol can cause a rough idle

I use 85% alcohol, idles OK.
Is yours idling rough?
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Old 08 Jun 2012, 08:18 am
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Default Re: More than 10% alcohol can cause a rough idle

The fellow on MotorWeek on TV the other night said you should only use 85% ethanol fuel in a FlexFuel vehicle. The ones I've seen have a chrome FlexFuel badge on the rear. My '03 Cruiser is not; don't know if Chrysler ever made one that is.
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Old 08 Jun 2012, 09:40 am
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Default Re: More than 10% alcohol can cause a rough idle

Lol, they can easily be converted. Kind of like adding chrome spears if your pt didn't come with them lol
UptownSport likes this.
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Old 08 Jun 2012, 04:44 pm
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Default Re: More than 10% alcohol can cause a rough idle

Quote:
Originally Posted by CruiserLady View Post
Hi
I just read that more than 10% alcohol in gas can cause a rough idle. Has anyone else heard the same?
The only gas you can buy with alcohol is 10% or less ---OR--- E-85. All modern cars are made from the factory to run on the 10% max that is at 99.999999% percent of all gas stations out there, so the question that comes to mind is, why are you asking?

Jerry
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Old 08 Jun 2012, 04:48 pm
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Default Re: More than 10% alcohol can cause a rough idle

````````

Last edited by Busa_Powered; 12 Jul 2012 at 06:00 pm.
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Old 08 Jun 2012, 04:52 pm
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Default Re: More than 10% alcohol can cause a rough idle

Quote:
Originally Posted by UptownSport View Post
I use 85% alcohol, idles OK.
Is yours idling rough?
Uptown, I know the E-85 conversion opens the doors for a LOT more power. A couple owners over at the crew converted to it and got great results. As far as I know, you're the first here. Did your mileage go down any? As if that really matters. Did the Megasquirt help with the conversion?

Jerry
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Old 08 Jun 2012, 05:01 pm
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Default Re: More than 10% alcohol can cause a rough idle

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Originally Posted by Busa_Powered View Post
crewzin was bragging a while ago about how he gets good, pure, virgin gasoline. He posted a website showing where to buy it.

I cant remember it or I would post it.

The closest one was like 100 miles from me, not feasible
Most of the marinas in my part of florida sell straight (no alcohol) type gas for the boats that use it. You just have to fill gas cans with it when buying from them for your car. They won't let you fill your vehicle up from their pumps (unless you know them-wink/wink).

Jerry
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Old 08 Jun 2012, 06:59 pm
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Default Re: More than 10% alcohol can cause a rough idle

Quote:
Originally Posted by Busa_Powered View Post
crewzin was bragging a while ago about how he gets good, pure, virgin gasoline. He posted a website showing where to buy it.

I cant remember it or I would post it.

The closest one was like 100 miles from me, not feasible
Ethanol-free gas stations in WA here you go, just change the state.
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Old 08 Jun 2012, 07:33 pm
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Default Re: More than 10% alcohol can cause a rough idle

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Originally Posted by wwpptc View Post
Uptown, I know the E-85 conversion opens the doors for a LOT more power. A couple owners over at the crew converted to it and got great results. As far as I know, you're the first here. Did your mileage go down any? As if that really matters. Did the Megasquirt help with the conversion?

Jerry
First note, E-85 isn't Methanol, it's just drink-alcohol- It won't hurt anything except you driving skills if you put it in the wrong 'tank!'

Run PT on E-85
You can:
1. Run w/o any changes. Runs lean (maxes short term trim), you'll have to do the keydance in cold weather to start. Great for States where E-85 is super cheap (South Dakota)

2. Guesstimate larger injector size; on closed loop 'close' is fine, PCM will adjust,
but for start, warmup, and acceleration you'll wan't to get within a couple lbs. Try 30 lbs to start.
Again, great if you can get E-85 for cheap or your situation requires premium.

3. Piggyback / standalone controller- (Megasquirt is most popular)
Takes over fuel (and spark if you wish) from PCM and you program on laptop.

(UN) Efficiency:
E-85 you'll use ~15-20% more fuel.

Why, then?
It won't ping, it's like getting $2 a gallon racegas at the pump.
It cools combustion chamber even more than gas, takes longer to warm up in Winter.
So radically mill head, deck block and remove headgasket shim with stock cams? No problem.

Fuels end up costing about the same per mile, however relative premium or racegas, alcohol then becomes a steal!

Power:
Obviously octane is a power enabler, putting 100 LLP aviation in a PT won't, in itself provide any more power, same gas on 12:1 compression ratio will!

Ethanol has a molecule of oxygen (It's an 'oxygenate', why they use it in current gasoline's) so the fuel, in itself provides more power without any mechanical modifications- only single digit percentage increase tho
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