help, triangulated 4 link with portals

[MOG40]

gday fellas,

new to this site, hoping someone may have a bit of knowledge and can give me some pointers when setting up the links in my new build.

I'm building a 40 series buggy with MOG404 portals on 9" housings. the diffs are about done and I'm doing my homework on calculating my links.

what i need to find out is how much separation do you need to overcome the extra levering force from the portal?

if anyone has any info it would be greatly appreciated.

Lawri.

[toughnut]

Well the answer is simple but not so easy on the solution. To overcome the extra leverage you would need to add the same distance that the portals add. As for solutions well it depends on a lot of different factors. What tyres are you running? What packaging constraints do you have IE. Suspension, chassis and what sort of driving etc. I've seen the upper mounts extended to help and I've also seen the lowers mount off a brace that goes to the bottom of the portal hub. Everything is a compromise.

[Jack S]

Minimum 12" link separation I believe...

[MOG40]

cheers tough nut & jack,
were a bouts did you get this info jack? or is this commonly known?
12" should be fairly easy to make work in my application.

does anyone els have anything worth noting in regard to linking diffs with portal hubs? is there any other factors worth noting?

cheers

[rockcrawler31]

Hi Mog

I don't know where the general rule comes from for the seperation factor but one way to look at it is that the portal gearing multiplies the torque at the wheels/links before you even add in the leverage factor. So i would use that ratio to increase the seperation.

E.G. 1.5:1 in the portals = 1.5x the torque seen at the diff housing and ergo the links. So if a normal separation was 8" i'd make it 12"

[Ice]

hi Lawri, have just gone through this with my tuff truck build, i should post up some pics some time, theres lots of info on pirate do some google searching

link material and mounts will also come in to play and how you can package the lot as well. grab the 4 link calculator and put some numbers in it and go from there

[MOG40]

cheers guys,
think I'm well on my way now.
this is the first time I've played with portals so its good to hear from others how they went about setting up their rigs. ill have a read through pirate. thanks

lawri

[toughnut]

Don't forget to post a build thread with lots of pics Lawri.