engine offset discussion
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Senior User
Joined: Sep 2008
Posts: 270
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From: Edmonton Alberta
engine offset discussion
what about engine offset i just got a 9 inch out of a 68 ford f100 i noticed that the pinion is off center by 4 inches doesthis mean that the engine and trans has to move over by the same amount i know the up down pinion angle is critical what about side to side any info
old and in the way
Joined: Jul 1997
Posts: 5,924
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From: Lovely Hueytown Alabama
woody...
your engine center line does not have to match your rear end center line
I doubt that you could get 4" of offset between the frame rails. 4" sounds like a lot... where are you taking your measurements ?? I'm just curious.
You didn't mention which engine you're using.... but if it will sit centered in the frame rails and you have steering linkage and header clearance and clearance on anything else... you don't need to offset at all... Just maintain the parallel center lines for engine and rear end... same on pinion angles...
this might give you some visual help
http://www.clubfte.com/users/jniolon...nephasing.html
later
John
your engine center line does not have to match your rear end center line
I doubt that you could get 4" of offset between the frame rails. 4" sounds like a lot... where are you taking your measurements ?? I'm just curious.
You didn't mention which engine you're using.... but if it will sit centered in the frame rails and you have steering linkage and header clearance and clearance on anything else... you don't need to offset at all... Just maintain the parallel center lines for engine and rear end... same on pinion angles...
this might give you some visual help
http://www.clubfte.com/users/jniolon...nephasing.html
later
John
Elder User
Joined: Jun 2004
Posts: 800
Likes: 6
From: Edmonton, Alberta Canada
with trucks centering the pinion is not as important as with a car. in a car the driveshaft has to run down the centre of the car through the tunnel, so the pinion is centered. that involves making one axle longer than the other.
on trucks the driveshaft doesn't have to run down a tunnel so Ford decided to make both axles the same lenght instead and that makes the pinion offset to one side. Since the driveshaft hangs down below the body, the driveshaft can run at an angle back to the rear end. where you place the engine is not critical as long as the centerline of the engine (crankshaft) is at a right angle (or parallel) to the rear end centreline. that is the engine should be parallel to the frame rails and not at an angle. this reduces vibration in the drivetrain. so you can offset the engine to gain clearance for headers or sterring box, etc.
hope that makes sense.
rgds
Mike
on trucks the driveshaft doesn't have to run down a tunnel so Ford decided to make both axles the same lenght instead and that makes the pinion offset to one side. Since the driveshaft hangs down below the body, the driveshaft can run at an angle back to the rear end. where you place the engine is not critical as long as the centerline of the engine (crankshaft) is at a right angle (or parallel) to the rear end centreline. that is the engine should be parallel to the frame rails and not at an angle. this reduces vibration in the drivetrain. so you can offset the engine to gain clearance for headers or sterring box, etc.
hope that makes sense.
rgds
Mike
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