Thread: RR engine change

Originally Posted by 400HPONGAS

Yeah Dougal , they dont in Rover V8's , but the 3.8 supercharged V6 is quoted as doing 7.5l /100k cruising, which is bout twice as good as any Rover V8 , NA or Supercharged in a 1650KG + Vehicle as well !!
AS2877
Here Dougal , GMH figures for VT commodore

• V8 5.7L Manual: 13.0 / 7.4 (L/100km) AS2877
  
  • V6 Automatic City / Highway: 12.0 / 7.2 (L/100km)
  • V6 Manual: 11.0 / 7.2 (L/100km)
  • Supercharged V6 Automatic: 13.5 / 7.8 (L/100km)
  • V8 5.0L Automatic: 15.0 / 9.0 (L/100km)
  • V8 5.0L Manual: 14.0 / 9.0 (L/100km)
  • V8 5.7L Automatic City/Highway: 13.0 / 8.5 (L/100km)
  • V8 5.7L Manual: 13.0 / 7.4 (L/100km)
  • Even if you added another 1000Kg it would still be better than a Rover V8

You'll notice they quote the supercharged engine as using about 10% more than the NA version.
I used to work for a company which had two NA commodores 3.8 V6 auto. Their average fuel consumption was 15-16 litres/100km. I couldn't get them below 12 litres/100km on any trip.

In a rangie, double it.
The other problem is peak torque just below 4000rpm.

Honestly, I don't know why people have any love for those engines. As a 90 deg V6 they aren't even compact for their displacement, power/litre and torque/litre isn't good and fuel consumption is woeful.

I had a 81 RRC that was built up here in SA and sold by the shop.
Had lots of issues. It did have a new gearbox, a 700 something rather but the economy was same as the 3.9L V8 I had in my other RRC.
The torque did not come on till around 2600rpm and box shifted all at the wrong time.
It drank too much fuel, had over heating problems and way too much electrical stuff for most mechanics to get their head around.

Its the only Rangie I took a big dive on when selling it.
I actually thought it was going to be a great thing but forget it.
Totally wrong motor for application.

For economy go diesel or Gas or better still, both.

Cheers

V8 5.7L Manual: 13.0 / 7.4 (L/100km)