post #1 of Old 11-15-2012, 05:09 AM Thread Starter
purplexj
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Converting to e85

I was just curious if anyone knows or has done this to their 4.0 I6. The reason i was wondering is because e85 around me is usually a dollar or more cheaper than gasoline.

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post #2 of Old 11-15-2012, 05:33 AM
Pats94
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Quote:
Originally Posted by purplexj
I was just curious if anyone knows or has done this to their 4.0 I6. The reason i was wondering is because e85 around me is usually a dollar or more cheaper than gasoline.
If you could get the pump you need, Change the fuel lines, Change the injectors, Change the ECU. You get about 30 percent less miles per gallon.

If its stock it sucks and if it scares the hell outta ya its just about right!
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post #3 of Old 11-15-2012, 08:07 AM
mschi772
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You'd also need to change any cork gaskets to rubber. I believe the current expected loss of mileage is 5-15%, but that's in regards to a flex vehicle and not a 50-year-old engine design. Unless you can teach the computer everything it needs to know for running E85, you can't do it, sorry.

I believe you'd honestly have an easier time finding a diesel engine for your XJ so that you could convert to biodiesel. Converting a diesel to biodiesel is relatively easy.
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post #4 of Old 11-16-2012, 06:38 AM Thread Starter
purplexj
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Thank you for your answers ill just keep the 4.0 in until it dies. If it dies.
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post #5 of Old 11-16-2012, 08:04 AM
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Aaaaactually E85 is the same price if not MORE than regular NON ethanol gas. You will probably travel LESS distance on E85 then the same cost of regular gas.

Less energy in E85. More fuel is dumped into the engine.

Figure 20MPG on straight gasoline..

Figure 15MPG E85. Prolly less in the I6.
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post #6 of Old 11-16-2012, 09:29 AM
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Originally Posted by diskman_1 View Post
Aaaaactually E85 is the same price if not MORE than regular NON ethanol gas. You will probably travel LESS distance on E85 then the same cost of regular gas.

Less energy in E85. More fuel is dumped into the engine.

Figure 20MPG on straight gasoline..

Figure 15MPG E85. Prolly less in the I6.
This! Very correct!

Now, even if the mileage was the same - would you really save any money? You're going to have to change the ENTIRE fuel system. New fuel pump, new fuel lines (ethanol cleans EVERYTHING OUT), rebuild the fuel rail with new E-85 injectors and all new seals.

Once you get that far, there's also the computer problem. The computer doesn't have the ability to compensate for the E85.

On cars that are "flex fuel" and designed for E85, they're able to pull the spark timing like crazy to stop it from pinging. Even with the upgraded fuel system, you're going to be pinging and knocking like crazy. I'm sure you can play with the timing on the distributor ... but it's still not going to run right ... ever.

I don't know how cold it gets where you live, but a while back, Ford did a test of e85 vehicles in cold weather. They couldn't get the vehicles to reliably start below 0F on the gasahol.

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post #7 of Old 11-16-2012, 05:59 PM
dmill89
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Originally Posted by purplexj View Post
ill just keep the 4.0 in until it dies. If it dies.
"Old Jeeps never die, they just rust away."


A little twist on MacArthur's famous quite. It applies to the 4.0Ls quite well. At least around here most of the ones I seen in junk yards either have rust holes in the frame big enough to put your hand through or have been wrecked/rolled, but still run just fine.
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post #8 of Old 11-16-2012, 06:18 PM
bobthecatkiller
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Quote:
Originally Posted by dmill89

"Old Jeeps never die, they just rust away."

A little twist on MacArthur's famous quite. It applies to the 4.0Ls quite well. At least around here most of the ones I seen in junk yards either have rust holes in the frame big enough to put your hand through or have been wrecked/rolled, but still run just fine.
+1 almost every jeep in my local jy says "runs and drives"

"****, I might **** around and bring the Jeep back No doors on it, flexin' with the seat back"
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post #9 of Old 11-23-2012, 01:03 AM
94jettameowpsst
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For the love of everything holy don't run e85 in your jeep. There's no increase in power output unless you plan on forced induction and the gas mileage is a lot worse than the figures listed. My old talon I converted to e85 and at 600hp at 90% duty cycle on 2600cc injectors and 2 fuel pumps I was averaging 95 miles per tank and that was with spirited driving.

Now w a jeep I can't see it that extreme but you will not see any gain from running 85, at all
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post #10 of Old 11-23-2012, 02:07 AM
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I tried 30/70 e85/ 95e10 (that's max. 10% ethanol on the 95 octane gas) mix on my 5.9 ZJ for about 10 full tanks. I saw about a 1-2MPG worse mileage mixed city and highway driving, no other ill- effects. e85 over this side of the ocean is roughly 1€ per litre (that's ~5.2$/ gallon, 95E10 gasoline is ~8$/ gallon), so I did save about 20€ per full tank of gas. Not a whole lot, but with the gas prices over here it adds up to big savings over the year. I stopped using the mix for the winter, may do that again when sprign comes.


Then again, XJ 6- cylinder is completely different engine and as far as I know, it really isn't recommended to use e85 at all, not even when mixing with normal gasoline. ZJ V8 engines I've seen reports and people have been using 'em with up to even 50% e85, but at that high ratios you will see a drop in mileage, reduced power and hard start-ups on cold weather. Over longer period of time I don't know if the the ZJ gasoline system (O- rings and stuff like that) components are ethanol- resistant enough to be ok for 30-50% on the fuel system. Jeep told Finnish authorities all their vehicles '87 and up are ok to run up to 10-20% ethanol-gasoline mix.

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post #11 of Old 11-23-2012, 03:41 AM
94jettameowpsst
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Ah see I was comparing it to a 100% e85 car.
You have to replace all the stock fuel lines with braided or plastic lines bc it will dryrot the rubber

Props for the better mileage
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