The will it work thread?

[Punderhead]

After being "diffed" a couple of times I thought that running separate brake lines to all four wheels and having two thick rollers each side of diff on the rear and one wide one on the front. This way you've got a chance to claw your way of deep ruts and over rocks. The rollers would be in two halves so installment would be simple.

while there is merit to this idea, and it could probably be done with a lot of rnd, it wouldn't be a simple as bolting two bits of half round together over the diff.

Firstly, if it did spin, it would wear away the diff housing in no time.

Secondly, I don't think it would spin, because the amount of friction would be too high.

So, in order to spin, and not wear away the diff, it needs bearings.

Fitting bearings would be possible with enough time and $$$, but that size bearing wild be fairly expensive. Also, you would then need to put on seals etc, as mud water could easily get in and chew out the Bearings.

Thirdly, why I wouldn't do it, instead of just having the diff pumpkin to get hung up on, now you have the entire length of the diff, reducing diff clearance by at least a couple of inches.

Not having a go at you, just like to think up problems/solutions for things.

I'm not an engineer, just a humble fitter, so someone feel free to tell me I'm wrong.


Cheers

[Punderhead]

Just thinking on your idea mudnut, why not weld on the diff a half piece of pipe,on the underneath of the pumpkins. You would lose 2-3mm clearance, but with the round at the front it wouldn't dog in and would slide on the dirt better.

Cheers

[mudnut]

Good Idea. but it couldn't be too long as it would apply torque on the pumpkin.

[doka404]

Just thinking on your idea mudnut, why not weld on the diff a half piece of pipe,on the underneath of the pumpkins. You would lose 2-3mm clearance, but with the round at the front it wouldn't dog in and would slide on the dirt better.

Cheers

Something like what is on the Currie Rock Jocks?

Attachment 56278

[Punderhead]

Good Idea. but it couldn't be too long as it would apply torque on the pumpkin.

Yep I was thinking something that was only just the size of the pumpkin, maybe even a Harris hard case with some pipe added.

Cheers

[Punderhead]

Something like what is on the Currie Rock Jocks? <img src="http://www.nissanpatrol.com.au/forums/attachment.php?attachmentid=56278"/>

Yep, something along those lines!

[mudnut]

Even that would be so much easier to shift than the angular surface of the pumpkin. I might have to knock one up out of some scrap.

[doka404]

Even that would be so much easier to shift than the angular surface of the pumpkin. I might have to knock one up out of some scrap.

Got me thinking now..think the Superior rear pinion guard would be just as good..
Attachment 56284

[Punderhead]

Got me thinking now..think the Superior rear pinion guard would be just as good.. <img src="http://www.nissanpatrol.com.au/forums/attachment.php?attachmentid=56284"/>

Might well be. Just modify it to get rid of that little step, and bobs ya uncle!

[Ben-e-boy]

So after all of this, if you could design the perfect diesel engine, or modify a suitable candidate, what would you do? With my very limited knowledge, I would want high pressure air induction (Higher combustion/ cleaner burn/ less emission) coupled with water injection (reduce temps). Air/fuel/water mix would have to be spot on....

Sound right or way off? And why is diesel/gas combo a cheap way to increase HP?

What makes modified diesels good for everyday, is a quick torque rise, flat torque curve and a correctly sized turbo,