Thread: Good deal on V8 camshafts but help me choose one

I would go for the mildest, ie 3.5 low comp.

Many recommend the 3.9 injection but in your case I believe low rev torque would be the priority, as the 3.9 injection give smore top end therefore less bottom end.
Regards Philip A

How often do you run petrol? If you only run lpg then id go for the efi cam - but get rid of the carb manifold and fit a late model efi / throttle body setup.

Originally Posted by Hardchina

How often do you run petrol? If you only run lpg then id go for the efi cam - but get rid of the carb manifold and fit a late model efi / throttle body setup.

I'm on lpg 95% of the time but need the petrol for extra range when necessary. (lpg only gives me about 300 km). What are the characteristics of the efi cam which make it better with lpg?

"What are the characteristics of the efi cam which make it better with lpg?"
Now I would be extremely interested in that answer !!! Im amazed that you can "pick a cam" without knowing its specification . By simply advancing or retarding the cam I can totally change the Characteristics . By the way the trick with LPG is VE%

G'day Mark2,

I recently installed a pre-pollution camshaft from an early Range Rover into my 3.5L County that runs on LPG, and i reckon it is a fantastic cam that provides lots of low down torque yet still performs very well on the highway. I talked a bit about it in this thread:

V8 Camshaft

On a side note, how do you find the power and torque of your bored and stroked V8 compared to when it was originally a 3.5L?

Edward

Originally Posted by mark2

I'm on lpg 95% of the time but need the petrol for extra range when necessary. (lpg only gives me about 300 km). What are the characteristics of the efi cam which make it better with lpg?

I've had Land Rover 'experts' tell me that EFI cams are the way to go for LPG use, and other well known Landy experts who said to steer well away from them!

Edward

Originally Posted by mark2

I'm on lpg 95% of the time but need the petrol for extra range when necessary. (lpg only gives me about 300 km). What are the characteristics of the efi cam which make it better with lpg?

The thing is with the efi cam - its tuned for the efi manifold. I'm not sure that it would be any better with lpg for any other reason. But LPG is a lot more forgiving with these things like weird cams, massive carbs or throttle bodies as the lpg won't drop out of the flow like little petrol droplets will.

AFAIK - the holden efi 202 cam was very similar specs to the xu1 cam - but worked a lot lower down in the rev range. The efi 202 was probably the torquiest low down holden six. Purley because of the cam and tuned length manifold working together.

Originally Posted by I Love My Landy!

G'day Mark2,

I recently installed a pre-pollution camshaft from an early Range Rover into my 3.5L County that runs on LPG, and i reckon it is a fantastic cam that provides lots of low down torque yet still performs very well on the highway. I talked a bit about it in this thread:

V8 Camshaft

On a side note, how do you find the power and torque of your bored and stroked V8 compared to when it was originally a 3.5L?

Edward

Sounds like another vote for the low compression carb cam!

I had no experience of this particular engine before it was modified however it is noticeably better torquewise than other 3.5's I have owned. The stroke was increased from 71 to 85mm.
I run Range Rover transfer gears in the LT95 with 31's and the gearing feels just right. It will go down to walking pace in high 3rd without pig-rooting and pull away to 100km/h cleanly.
It runs out of breath at about 4000 rpm (100 in 3rd) but that is probably largely to do with my restrictive intake setup (lpg mixers and complicated air cleaner plumbing)

Main reason for replacing this one is lifter noise and a suspicion the current cam is a little 'warm', the potential of which I'm not realising due to the restrictive intake - I think there is even more torque potential with a very mild cam.