jamesmartin

Well-Known Member

• Sep 19, 2011

• #21

serpentine belted ones are better as have improved water pump that supplies both baks equally unlike earlier

 

crazydave

Member

• Sep 19, 2011

• #22

As far as I'm aware, if you use a serp front end, the whole lot will bolt together fine, but the keyway in the crankshaft nose will not be long enough to provide a positive drive to the front pulley, so although it will be sandwiched tight, it will be turned by friction alone.

As for the camshaft fight, I'm with vougese39.

 

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landroverlane

New Member

• Sep 19, 2011

• #23

is the knackered 4.2 engine a serp or v groove engine?

 

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craykent

Active Member

• Sep 19, 2011

• #24

landroverlane said:

is the knackered 4.2 engine a serp or v groove engine?

Click to expand...

hi its a v groove engine thanks

 

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craykent

Active Member

• Sep 19, 2011

• #25

Just a thought when i build up a 4.2 using a 3.9 block it won't need a different ecu will it
the way i see it it should run ok and on lpg. All i have done is unbolted to the side the inlet manifold injectors still in situe ? advice please

 

crazydave

Member

• Sep 19, 2011

• #26

Just to clear up any confusion, a vee belt is about 10mm wide and has one 'V' and a serpentine belt is wide and flat with lots of 'V's on the underside.

Just making sure that were all singing off the same hymm sheet

 

crazydave

Member

• Sep 19, 2011

• #27

If the only component that is 'new' to the vehicle is the block, then all will be ok. and it will still be a 4.2

 

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craykent

Active Member

• Sep 19, 2011

• #28

Many thank the hunt is still on . the spanners have been sharpened.

 

joe1972

Well-Known Member

• Sep 19, 2011

• #29

craykent said:

Just a thought when i build up a 4.2 using a 3.9 block it won't need a different ecu will it
the way i see it it should run ok and on lpg. All i have done is unbolted to the side the inlet manifold injectors still in situe ? advice please

Click to expand...

The question was asked on page2, but no answer unfortunately.
I'm guessing if using the injector set up with the 14CUX system it will be the same?.......but hope someone will confirm this for you

good luck with the changeover

 

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landroverlane

New Member

• Sep 19, 2011

• #30

all that you are changing during this conversion is the block. everything else is going to be the original parts. you already have the 4.2 ecu, wiring loom etc. what you are doing with the 3.9 block (using 4.2 internals) is going to turn it into a 4.2. you should not need to change any electrics or settings. the only real difference between the two engines is the stroke, mabe cam and possibly the ecu map (not sure if they even bothered). the whole injector set up and the injectors are exactly the same. i would suggest if it is a v groove engine to keep it that way for ease of assembly!

 

Last edited: Sep 19, 2011

vougese39

Well-Known Member

• Sep 20, 2011

• #31

14 cux for al its faults will adapt fitted to any engine capacity rover v8.
examples
fitting as a replacement to a failed 3.5 flapper system ok
3.9 - 4.2 conversion fine
3.9 4.6 conversion fine as a temp but you will need a altered mapped chip as the fuel demand is greater but will run

 

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craykent

Active Member

• Sep 20, 2011

• #32

That answers the question many thanks