Is the Range Rover 4.6 (P38) different than the Disco 4.6?

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Feb 24, 2013 | 06:43 PM

#41

toad2

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Rock Crawling

Joined: Apr 2010

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From: New Brunswick, Canada

Quote:

Originally Posted by Paul Grant

Some Bosch engines came with Secondary Air Injection, some did not. This difference then extends to the EFI ECU and it's relationship with it's BCU. One has to be careful, all Bosch engines are not the same.

So, Bosch 4.6 out of 99-01 RR HSE will work in an 04 Disco, correct?

Feb 24, 2013 | 06:52 PM

#42

Paul Grant

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Joined: Sep 2006

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From: CT

Quote:

Originally Posted by toad2

So, Bosch 4.6 out of 99-01 RR HSE will work in an 04 Disco, correct?

Yes, a Bosch 4.6L from a P38a will work on an '04 DII. However, as mentioned by others, if your DII has secondary air injection you will need retain that system when swapping engines. So, if the 4.6L out of the P38a was not equipped with SAI, and your DII is, you will need to retain the DII heads. Otherwise the EFI ECU for your engine will have issues with the P38a engine's lack of SAI.

Feb 24, 2013 | 07:03 PM

#43

toad2

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Rock Crawling

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From: New Brunswick, Canada

Right. Thanks Paul. Wasn't sure any of the old RR's had SAI as mine does.

Feb 24, 2013 | 07:10 PM

#44

Paul Grant

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From: CT

Quote:

Originally Posted by toad2

Right. Thanks Paul. Wasn't sure any of the old RR's had SAI as mine does.

Some did, others didn't. The ports for SAI are in the heads so they are what really matter.

BTW, you should be able to find a good 4.6L engine for a lot less that $5700! AB has re manufactured 4.6 short blocks for $5k. That's re manufactured with zero miles. Give Will Tillery or Marty Powell a call for a 4.6 when you're ready.