ENGINE TRANSPLANT???

Quote:

---

Originally Posted by Dougal

Simple physics dictates that if you boost a petrol engine, you need higher octane fuel or lower compression to prevent detonation. You could retard the ignition or richen the mixture to get some effect.
But no matter which method you choose, your off-boost efficiency takes a dive so fuel consumption increases.
If you'd rather run ethanol or av-gas to suppress detonation. Then your running cost just took another leap.

When you're on boost, all the extra air that's being pushed into the engine is acampanied by extra fuel.
Result, your fuel consumption increases.

Personally I can't see a high horsepower petrol v8 as good for anything except throwing mud or **** factor. While that might be great fun, it's not much use for a vehicle to actually go places.
A 50hp diesel tractor would be far more capable.

---

The problem being is you've never had a high performance V8 in a 4wd;)

I've had both, when range isn;t a concern, HP all the way

Quote:

---

Originally Posted by rovercare

The problem being is you've never had a high performance V8 in a 4wd;)

I've had both, when range isn;t a concern, HP all the way

---

So how do BMW and VW win outright stages in the paris-dakar with diesels?

Quote:

---

Originally Posted by Dougal

So how do BMW and VW win outright stages in the paris-dakar with diesels?

---

They are works teams with purpose built race cars that bear only superficial resemblance to what they sell to the retail customers.

Quote:

---

Originally Posted by Dougal

So how do BMW and VW win outright stages in the paris-dakar with diesels?

---

Are VW using the T5 engine?

Quote:

---

Originally Posted by Dougal

So how do BMW and VW win outright stages in the paris-dakar with diesels?

---

Who gives a toss, that's hardly the 4wdriving ANYONE here does, is it;)

The way I look at it is.... If its for recreational or mild comp use and not a daily driver the Big HP V8 is good.
If a daily driver or long distance tourer then the oiler is far better but not as drivable off road with lack of rev range.

Hopefully I'll have one set up each way soon:) Supercharged Rangie and the 4BD1 T 120" Best of both worlds:D

If I had the time and inclination I'd try the commy bent 8 for sure. I think in a heavier vehicle with larger tyres etc they may be a little thirsty though.
Be no worse than the Rover 8 however.

Quote:

---

Originally Posted by Brian Hjelm

They are works teams with purpose built race cars that bear only superficial resemblance to what they sell to the retail customers.

---

Which beat all the works teams and privateers with purpose built big power V8's.;)
Unlimited class, diesels win.
Hmm.

The reality is, you can't use big hp offroad, anyone who thinks you can hasn't thought about it particularly hard.
You can use big torque though and the lower that torque is in the rpm band, the better.

Lets do the maths.
2.5t 4wd.
Grip on the ground of 0.3 times it's weight.
Power required to spin all four wheels at 50km/h.
P = force x velocity
P = 2500(kg)*9.81(g)*0.3(grip)*13.9 (m/s)
P = 102kW.

What is the aim again?
Going places?
Throwing mud/sand?
Bragging around the camp-fire?

Quote:

---

Originally Posted by Rangier Rover

The way I look at it is.... If its for recreational or mild comp use and not a daily driver the Big HP V8 is good.
If a daily driver or long distance tourer then the oiler is far better but not as drivable off road with lack of rev range.

Hopefully I'll have one set up each way soon:) Supercharged Rangie and the 4BD1 T 120" Best of both worlds:D

If I had the time and inclination I'd try the commy bent 8 for sure. I think in a heavier vehicle with larger tyres etc they may be a little thirsty though.
Be no worse than the Rover 8 however.

---

Tony , even for Mild Comp my Tdi with the right gearing is adequate enough to compete , however if I were to take my tdi to stockton beach and try and follow behind someone with a big HP petrol engine up a BIG sand dune then I have no hope in hell with 35" tyres to climb up some of the sand dunes. I'll certainly try , Mike ( Cal415) does a lot of Beach driving , he would have a lot more experience at this than anyone else here , and it's not about throwing Mud or kicking sand or what ever else mentioned here.

Quote:

---

Originally Posted by Disco_owner

Tony , even for Mild Comp my Tdi with the right gearing is adequate enough to compete , however if I were to take my tdi to stockton beach and try and follow behind someone with a big HP petrol engine up a BIG sand dune then I have no hope in hell with 35" tyres to climb up some of the sand dunes. I certainly try , Mike ( Cal415) does a lot of Beach driving , he would have a lot more experience at this than anyone else here , and it's not about throwing Mud or kicking sand or what ever else mentioned here.

---

How about Mike puts the biggest V8 he can fit into a landrover and we try it out on sand-dunes against a 4BD1T wrapped in whatever we like?

My money is still on the 4BD1T.:twisted:
[ame=http://www.4btswaps.com/forum/showthread.php't=7435]Dieselbuggy's awsome isuzu YOU MUST LOOK!! - Cummins 4BT & Diesel Conversions Forums[/ame]

https://www.aulro.com/afvb/images/im...009/09/765.jpg

https://www.aulro.com/afvb/images/im...009/09/765.jpg

:angel:

Quote:

---

Originally Posted by Dougal

How about Mike puts the biggest V8 he can fit into a landrover and we try it out on sand-dunes against a 4BD1T wrapped in whatever we like?

My money is still on the 4BD1T.:twisted:
Dieselbuggy's awsome isuzu YOU MUST LOOK!! - Cummins 4BT & Diesel Conversions Forums

http://inlinethumb40.webshots.com/40...600x600Q85.jpg

http://inlinethumb52.webshots.com/40...600x600Q85.jpg

:angel:

---

No Thanks :angel:

have a look at the amount of Black Smoke pouring out the back of the Gunbuggy :p I'd like to be able to breathe while I'm driving up Big Dunes on full noise. but seriously the original poster 's intentions are to replace his Petrol engine with a Petrol engine not a 4BD1T ;)