Top End Rebuild 3.5 EFI V8

**jazzaD1** · 10th February 2011, 11:44 AM

about a year ago, i swapped a motor from an 82 range rover (9.35:1) into my discovery, as the old one lost all compression

the 'new' engine has been ok, but now it needs some work done to it

i didn't file out the ports for the injectors, and just bolted the efi gear on to it, which isnt ideal for performance, the replacement engine was sitting for a long time before i used it, and as a consequence it now leaks oil from just about everywhere, and has a head gasket issue

my plan is to replace the heads with the ones from my old 3.5 efi, which were only rebuilt 9 months before the bottom end died, and so while doing so, replace the camshaft, lifters and any gaskets or seals that need doing, possibly even the timing gear and chain

has anyone done something similar before? or have any suggestions to a camshaft choice? the 82 rangie engine had air injection for pollution control and i have been told had one of the worst profile camshafts ever made for the rover v8, that and im guessing it is worn as most do

the reason i want to keep using this block is the higher compression (9.35:1) than my old discovery block (8.13:1)

oh and i mainly use it for off-roading, as i no longer use it for a daily driver, and it has aftermarket injection (megasquirt) so the cam doesn't need to be limited by the standard ECU (14CUX)

**PhilipA** · 10th February 2011, 01:41 PM

I believe a 3.9 injection cam is the best for overall performance including low rev torque.
Ask yourself really how many times you exceed 4500RPM, compared to how many times you approach a hill at 2300RPM in top.
There are quite a few threads on here about cam choice with several people disappointed.
I have just bought a 3.9 cam to replace my old one.
If you MUST buy an aftermarket cam I recommend the Wade 259A as this has the correct theoretical lobe separation of 109degrees for the Rover V8 stroke /bore ratio and a reasonable overlap, but to me the lift is excessive for long life at .402 inches, and a sensible duration of 63-27/25-64 which Wade say is "towing" but experts say is "street"

Regards Philip A

**PLR** · 10th February 2011, 10:03 PM

Originally Posted by PhilipA

If you MUST buy an aftermarket cam I recommend the Wade 259A as this has the correct theoretical lobe separation of 109degrees for the Rover V8 stroke /bore ratio and a reasonable overlap, but to me the lift is excessive for long life at .402 inches, and a sensible duration of 63-27/25-64 which Wade say is "towing" but experts say is "street"

Regards Philip A

G`day Jazza/Philip ,

i agree the 259a is suitable .

I`ve been using one for 7 or more yrs in a 4.0 ltr .

The reason i chose it back then was because it had similar figures to a sd1 3.5 .

The rover had 0.390 lift and the 259a has 0.402 at inlet and 0.400 at the exhaust , which i don`t consider a great difference .

As far as the comment about tow and street i consider the blokes at Wade are experts .

Wade consider the 259a a torque cam if horse power is wanted they would recommend different numbers .

I think in a Disco/RR with the 259a that advancing the timing would benefit if on gas but if the cam is to be fitted dot to dot and not dialed , i`d suggest a factory early 3.5 cam for torque or the efi 3.9 for ponies .

peter

**jazzaD1** · 10th February 2011, 11:31 PM

thanks for your input guys! i certainly dont want to make a mistake with all of this

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