4.0 internals same as 4.6? - Defender Source
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  #1  
Old January 17th, 2007, 03:02 PM
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Neil McCauley
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4.0 internals same as 4.6?

I know this has been discussed before but I'd like to clarify just to be sure because I've seen some conflicting information regarding the swaping of these parts. So far this is what I got..........there is no difference between a 4.0 & 4.6 block other than the crank? Meaning the bore size, pistons and rods are the same, but only the crank has a different stroke? I'd like to know because I have a good used 4.0 block and is considereing purchasing the crank/rods/pistons from a 4.6. Obviously if the rods and pistons are the same, I'd like to keep the ones I already have from the 4.0. Again any help is appreciated, Cheers!

Neil
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Old January 17th, 2007, 03:08 PM
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jim pendleton
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There are different part numbers for the pistons.

JP
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Old January 17th, 2007, 03:08 PM
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Chris Davis
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The block is the same, the crank, rods and pistons are different. I seriously considered using the 4.6 crank with the 4.0 rods and pistons but the compression ratio would be about 11:1 or so if memory serves and that is just too high for my tastes--especially if you have to borrow gas from someone on the trail. You will need to get the 4.6 crank/rod/pistons to use it and keep the 9.*:1 compression (9.3?).

Good luck with your conversion.
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Old January 17th, 2007, 03:26 PM
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Quote:
Originally Posted by Davis
The block is the same, the crank, rods and pistons are different. I seriously considered using the 4.6 crank with the 4.0 rods and pistons but the compression ratio would be about 11:1 or so if memory serves and that is just too high for my tastes--especially if you have to borrow gas from someone on the trail. You will need to get the 4.6 crank/rod/pistons to use it and keep the 9.*:1 compression (9.3?).

Good luck with your conversion.


Thanks, I guess that settles it, I'm going to Land Rovers Land in Sunland and buy a good used 4.6 crank, rods and pistons with a set of new mains, rods and rings to put in my used 4.0 block. Hope it comes out alright (projects like these are nail biters)

Neil
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Old January 17th, 2007, 03:53 PM
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" I seriously considered using the 4.6 crank with the 4.0 rods and pistons but the compression ratio would be about 11:1 or so if memory serves and that is just too high for my tastes--"

Humm . . . . . 11:1 really? I think you could get down a bit with using 3.9 heads with the composite gaskets.

Ron
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