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Engine rebuild and now getting horrible gas mileage

  #1  
Old 12-25-2012
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Engine rebuild and now getting horrible gas mileage

My ranger had a bent rod. Had to get a new small block. Installed it with the original heads. Truck runs great but I use to get 330 miles on a tank. Now I'm getting around 220 miles. I have a 3.0l. Why is my gas mileage so crappy after installing new block?
 
  #2  
Old 12-26-2012
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Most motors require a "break-in" period before you start seeing "normal" numbers when it comes to performance
 
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Old 12-26-2012
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Originally Posted by phatspeed7x View Post
Most motors require a "break-in" period before you start seeing "normal" numbers when it comes to performance
And MPG you can expect your mileage numbers to be low for the first 1-2k miles. My ranger was the same way got 18 mpg for the first 2k miles then slowly went up to 35 on the highway.
 
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Old 12-26-2012
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Where'd you get your work done? I see you're down the road from me....
 
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Old 12-27-2012
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who did they work. if proper break in procedures are not followed you may not get a very good engine as a result. all the internal parts need to be broken in properly to seat the piston rings to the cylinders for proper compression seal. if there is a problem somewhere along the way you will get bad fuel mileage and power as well as a shorter life expectancy out of that engine
 
  #6  
Old 12-28-2012
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I did the work myself and I worked at a base hobby shop. I just installed the same heads on their and when the job was done I put in regular 5w20 oil and changed the oil after 500 miles. Then I changed the oil again and ran it for about a1000 miles and noticed the rear main seal was leaking so I put some rear main seal oil in it but it did not help. I have to replace the rear main seal now.
 
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