I'm getting 9 MPG.
Fleet Owner
Joined: Jul 2006
Posts: 20,360
Likes: 822
From: Mi'kma'ki
ahh ok.
yeah forget about fuel economy at all with a tight engine.
you keep track of it now,your gunna get sick lmao.
check her again when you have 3 or 5 oil changes on her.
she'll keep loosening up,and you will keep seeing more and more power.its gunna feel like a dog likely until she's run in,and fuel economy is gunna suck.thats just how new engines before brake in are.
dont compare the thing to gas job yet.
yeah forget about fuel economy at all with a tight engine.
you keep track of it now,your gunna get sick lmao.
check her again when you have 3 or 5 oil changes on her.
she'll keep loosening up,and you will keep seeing more and more power.its gunna feel like a dog likely until she's run in,and fuel economy is gunna suck.thats just how new engines before brake in are.
dont compare the thing to gas job yet.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Bill have you ever done a textbook break in on that truck? (no jokes about busting the glass, guys!)
Hard acceleration from 35-55 MPH a few times with engine braking to return to the bottom end of that speed zone. Vary the lower and higher speeds while gradually increasing top speed.
I did this for a few weeks when I first put my 6.9 back together. Never did MPG tests that early but I was getting decent numbers by the time I was past 2-5k.
Is there any smoke visible in the side mirror when you are driving it?
How does it start cold?
Hard acceleration from 35-55 MPH a few times with engine braking to return to the bottom end of that speed zone. Vary the lower and higher speeds while gradually increasing top speed.
I did this for a few weeks when I first put my 6.9 back together. Never did MPG tests that early but I was getting decent numbers by the time I was past 2-5k.
Is there any smoke visible in the side mirror when you are driving it?
How does it start cold?
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Yes, I did. Takes it forever to get it to go from 33 to 55.
Very small amount of smoke at WOT at lower RPMs under a load.
Cold starts great, IMO. I can make a vid if you want. I have nothing to compare it to, so I guese I don't know.
Very small amount of smoke at WOT at lower RPMs under a load.
Cold starts great, IMO. I can make a vid if you want. I have nothing to compare it to, so I guese I don't know.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
When I first put mine together, it did not run very good and the mileage just flat sucked.
As the miles went on, the engine loosened up, the HP and mileage was continually increasing.
I am going to say I was over 50,000 miles before it really started to run great.
As the miles went on, the engine loosened up, the HP and mileage was continually increasing.
I am going to say I was over 50,000 miles before it really started to run great.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
is it this rig here:
https://www.ford-trucks.com/forums/p...ictureid=19731
is that a f250 or 350?
is it 2 or 4wd?
did you inspect the front wheel bearings,and insure all 4 wheels spin freely when you jack them off the ground?
when's the last time the trans/transfer/rear oil was changed?
https://www.ford-trucks.com/forums/p...ictureid=19731
is that a f250 or 350?
is it 2 or 4wd?
did you inspect the front wheel bearings,and insure all 4 wheels spin freely when you jack them off the ground?
when's the last time the trans/transfer/rear oil was changed?
Its a 250 4x4.
All 4 turn like they should and both diffs, the tranny and the T-case got fresh 80W90 when I got the truck. Less than 1000 miles since then.
Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
When I first put mine together, it did not run very good and the mileage just flat sucked.
As the miles went on, the engine loosened up, the HP and mileage was continually increasing.
I am going to say I was over 50,000 miles before it really started to run great.
As the miles went on, the engine loosened up, the HP and mileage was continually increasing.
I am going to say I was over 50,000 miles before it really started to run great.
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Thread Starter
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Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
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Thats how it starts and the way it runs cold at idle.
Thats how it starts and the way it runs cold at idle.
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
If your t-case is a 1356 it should have ATF in it not gear oil.