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  #16  
Old February 15th, 2008, 09:19
indy_xj indy_xj is offline
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Re: 0331 head swap, mpg change?

Quote:
Originally Posted by Hawg130
Hey Indy, what did you do about securing the coil pack? I'm considering doing this and need some pointers. Thanks.
write up w/ pics here http://www.naxja.org/forum/showthread.php?t=937214
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  #17  
Old February 15th, 2008, 11:51
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XJ01-08 XJ01-08 is offline
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Re: 0331 head swap, mpg change?

i swaped out my 0331 head for a newer one, i didnt know how to adapt the older head then, and the head cracked just b4 winter so i cant really compare my MPG from then to now but it is lower then it was b4 i swapped it out
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  #18  
Old February 15th, 2008, 13:37
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Re: 0331 head swap, mpg change?

I had a sudden drop in mpg, drove me nuts trying to figure it out till I learned that most of the gas stations in my area switched to E10 and never said anything. I found one place that still sells real gas and my mpg went up again.
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  #19  
Old February 15th, 2008, 16:41
indy_xj indy_xj is offline
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Re: 0331 head swap, mpg change?

Quote:
Originally Posted by falcon556
I had a sudden drop in mpg, drove me nuts trying to figure it out till I learned that most of the gas stations in my area switched to E10 and never said anything. I found one place that still sells real gas and my mpg went up again.
interesting. I just heard a blurb on the radio today about e15 gas. Might be making its way to my neck of the woods. I'll keep my eye peeled.

thanks,

ixj
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  #20  
Old February 15th, 2008, 18:25
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Re: 0331 head swap, mpg change?

Quote:
Originally Posted by falcon556
I had a sudden drop in mpg, drove me nuts trying to figure it out till I learned that most of the gas stations in my area switched to E10 and never said anything. I found one place that still sells real gas and my mpg went up again.
Thats why i need to stop getting my gas at walmart lol
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  #21  
Old February 15th, 2008, 18:52
BIGSLVRXJ BIGSLVRXJ is offline
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Re: 0331 head swap, mpg change?

I run E-10 in mine, I notice no difference between it and regular gas. Now running E-85 is playing with fire.
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  #22  
Old February 15th, 2008, 19:12
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Re: 0331 head swap, mpg change?

just a thought here...

recheck the torque on your intake/exhaust manifold bolts.

EVERY time I've had them off, I've ALWAYS had to retorque them a week later.

could just be a simple vacuum leak.
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  #23  
Old February 16th, 2008, 04:24
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Re: 0331 head swap, mpg change?

Lots of states mandate E10 and it isn't a problem to run it on most vehicles. E85 should be run ONLY in vehicles designed for it. Flex fuel vehicles direct from the mfg and vehicles that have undergone a conversion to allow it.

Fuels with enriched blends Ethanol will get less MPG compared to pure gasoline. Gasoline has 104,000 BTU/gal, E10 has 100,700 BTU/gal, and pure ethanol has 70,300 BTU/gal. Various estimates say vehicles with using the E85 blend will get 15 to 25% lower MPG.

Ethanol contains less energy than gasoline, so ethanol blends get fewer miles to the gallon. Ethanol advocates may make the claim that the drop is 2 percent or less for E10 but Iowa State University Professor Larry Johnson and other independent testing estimates that E10 delivers 96.4 percent of the miles per gallon of gasoline, a drop of 3.6 percent, and E85 delivers only 80 percent.

Based on numerous studies, a vehicle that gets 25 miles to the gallon (yea, not our XJs) and has a 17-gallon tank could go 425 miles on a tank of pure gasoline. That same vehicle would get 24.1 mpg with E10 and travel 410 miles, or get 20 mpg with E85 and go 340 miles.
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  #24  
Old February 16th, 2008, 15:29
indy_xj indy_xj is offline
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Re: 0331 head swap, mpg change?

Quote:
Originally Posted by CheapXJ
just a thought here...

recheck the torque on your intake/exhaust manifold bolts.
yeah, did that about 2 weeks ago. Bottom ones were all tight. I think 2 of the top ones had backed out about 5 lb-ft or so. spec is 24 lb-ft for anyone wondering.

ixj
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  #25  
Old February 17th, 2008, 20:57
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Re: 0331 head swap, mpg change?

Quote:
Originally Posted by CheapXJ
just a thought here...

recheck the torque on your intake/exhaust manifold bolts.

EVERY time I've had them off, I've ALWAYS had to retorque them a week later.

could just be a simple vacuum leak.
Knew i forgot to check something
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