Thread: The 85 Classic

Originally Posted by Ancient Mariner

Have to ask Dougal Why aluminium for the nut (saving weight}?

That's really easy to explain. I've got lots of it and no steel bar the right size.
It drills and taps much easier and still has sufficient strength for the job. Weight saving is a bonus. 62g.

Originally Posted by workingonit

Thanks for the photos.

Ditto the aluminium? Is that vulcanising rubber locking it (the bits of blue)?

Given no bearing support, worth considering pegging like diff crowns, or like the steady on a lathe. Just off the shaft but there as an assist for excess bowing (if that were ever likely).

The blue is locktight that got pushed out of the threads.
This shaft has bearing support at the gearbox and the transfer-box. The bearing in the middle was too much restraint and causing problems which it won't when it's gone.
In a perfect world it'd be a completely concentric shaft and the centre bearing would have no problem. But just like welding we have to account for distortion from the heat-treatment along with the splines cut in each end likely not being completely concentric.

If the shaft was long and flexible enough it would also be fine with a centre bearing, but this is quite short for it's diameter and I think stiffer than the housings which support the bearings.

Originally Posted by isuzurover

It is clear from reading the attached thread that you should pull out your 4BD1T and fit a 2.4VM Dougal...
Difflock :: View topic - range rover 2.4 vm deisel
You can probably find an Alfa 75 over there with one fitted going cheap?

Chuck from Haultech said that he turned up the boost on his to ~25 psi before he pulled it to fit a 4BD1T. He said he couldn't kill it, but there were pieces of piston ring embedded in the cylinder heads...

There's no problem with someone wanting to tweak up the engine they've got. But getting all "butt-hurt" (american term) when it's pointed out why no-one else in the entire world has had success with supercharged diesels is just silly. It doesn't matter how many ricer burners you've owned. Diesels are very different.

Perhaps Mr VM thinks instead of doing all the maths and hard work behind turbo sizing we should all just be running terrible turbos and strap on a supercharger as well!

Rings embedded in the head, isn't that factory?

It is ok tho I will blame the guy that sold me the wrong ring's isuzurover it was only time that determined when you would pipe up.

when it's pointed out why no-one else in the entire world has had success with supercharged diesels is just silly

OK your right no one has had success get ya head out of the sand and search mate plenty have.



Factory fitted Chevy.

Nice looking engine.

From my brief look around the internet it seems you can happily supercharge a diesel.

However, overall, turbo charging is the preferred method – cheaper – continuing improvements mechanically and in combinations but becomes more technical - uses exhaust gas ie no engine load and comparatively less fuel used.

Supercharging – main advantage instance engine response – less technical - uses more fuel (engine load) – engine conversions cost a bit more – turbo combinations can give similar engine response - best for race apps and the like, prime movers wanting to get heavy loads moving, enthusiasts where cost and fuel consumption is not of concern - small engines in the say 2 to 3 litre range generally not considered worth while probably because the overall output doesn't give the adrenalin rush, ie fun exponential to cubes

Interesting sojourn.

So Dougal, when can you start mass manufacturing the shafts...(no rude comments from anyone).

Thanks for the aluminium answer .I thought it might have been some Hi Tec reason from the rocket science division

AM

Turbo's are a natural match for four stroke diesel engines.

It is a common mistake to generalise that, because they use energy from the exhaust gas, they don't consume some engine power/torque. However when a reasonably well matched turbo is used, this is minimal and can be ignored.

While a supercharger can be used, they are a poor choice compared to a half decent turbo. If someone is silly enough to go down that path, then so be it, I'm sure they will justify their reasoning in their own mind.

Originally Posted by VM_Motori

OK your right no one has had success get ya head out of the sand and search mate plenty have.

Please, structure your sentences.

I have done far more research than you have. That is not a factory fitted anything.
It's completely aftermarket, your picture came from this page: Chev / Hummer / Silverado / Suburban 6.5 Litre Diesel Supercharger Kit
The company is Australian, likely mates of the same crowd who put 6.5 chev diesels into landcruisers and patrols. It must be hard to compete with such awesomeness, but I'm sure a supercharged VM will have the same street cred.

Note there are zero performance claims to go with those kits. Those 6.5's also suffer very similar problems to your VM.

Seriously, kids these days.

Originally Posted by Bush65

While a supercharger can be used, they are a poor choice compared to a half decent turbo. If someone is silly enough to go down that path, then so be it, I'm sure they will justify their reasoning in their own mind.

Quoted again for the truth.

Originally Posted by Dougal

...

Note there are zero performance claims to go with those kits. ...

You are full of BS as usual Dougal...

There is this video which says all you need to know
[ame=http://www.youtube.com/watch?v=-hoZZpxYfXE]Supercharged 6.5L V8 Chev Bullet diesel -v- Turbo 6.5 V8 Chev diesel - YouTube[/ame]


But wait, you also get:

Benefits over Turbocharging:
Instantaneous response. No turbo lag.
Easier Installation
Less Under bonnet Heat
Cylinder head is prone to stress cracks with turbocharger
Kit is available to suit left or right side Air cleaner
Suitable for marine applications

And "sort of" power claims:

The output of the normally aspirated & turbo 6.5 ranges between 180-215 bhp (134kw-160kw) ...

Bullet’s range of Supercharged engines include; 250HP, 275HP, 300HP & 350HP units, with custom upgrade units to 400HP also available.

Originally Posted by isuzurover

You are full of BS as usual Dougal...

There is this video which says all you need to know
Supercharged 6.5L V8 Chev Bullet diesel -v- Turbo 6.5 V8 Chev diesel - YouTube

But wait, you also get:

And "sort of" power claims:

I'm still looking for the testimonials. The chev 6.5 diesels can't do 20mpg without a supercharger. Must be horrendous with.

160kw from 6.5 litres is about 25kw per litre of displacement.

Scale that to a 2.4L VM and we've got 60kw.