[ROVERNET - UK] 4.6 SD1
kkinard at wcc.net
Wed Oct 25 15:49:20 BST 2006
Winchester, Miles wrote:
>Thanks Kent and Rob,
>A local Landrover specialist has been trying to sell me a 3.9 for the SD1
>but I said I would only consider a 4.6 engine. He caught me by surprise and
>said he has a 4.6 available soon. Thought I should find out how easy the
>conversion is before I next talk to him.
Did you ever get a copy of the Des Hammill book on Rover V8's? Although
there are some inaccuracies, it is a very insightful read. Good
information about the 4CU EFI system also. If you send Franc Buxton and
ECU, he can convert it to Vitesse spec. It will make a world of
different in both fuel consumption (better) and performance even on the
federal injection. I can send Franc an ECU and he can post it on to
you. I have two or three spares.
You can simply use the 4.6 long block and mount the SD1 front cover and
transmission and be done with it (cut the lug off the rear of the crank
as previously described if necessary) but be sure your oil pump is not
scored and fully up to spec. Note the compression ratio so you can
choose proper heads and gaskets. You will need to make up a plate to
cover the crank sensor hole.
The "interim" cover has provision for a distributor (the hole is most
frequently blanked off like the fuel pump hole on earlier front covers)
but can be drilled out. This is a precission operation for a machinist.
This front cover used the new style crank driven oil pump. I think only
the last 4.2's and early Disco's actually used a distributor. This front
cover will match the long nose crank, but you will also need the
matching crankshaft pulley. There are several different damper/pulley
combinations and the best is (again) the long damper from the 4.2 which
has both a serpentine and a V-belt groove. The crank pulley from the
4.6 will not work as it sits too close to the front cover to drive the
water pump on the interim cover. This conversion is well worth the
effort, though. If you can't find an interim cover, I have two and
probably won't use the second one. I still owe you (or Ron or Edward?)
for the door skin.
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