CV Gurus

[fangsport]

as i have finally started to get the 4wd buggie in the build, i need to sort some ground clearance and weight distribution out.

if both ends of the CV (i.e. the hub end and g/box end) are paralell, what is the maximum angle a CV joint will operate safely without excess wear/binding, and will a compounded angle (i.e. drooped and pushed foward/back) have any major drawbacks?

[ROBODISCO_20v]

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[RedMist]

as i have finally started to get the 4wd buggie in the build, i need to sort some ground clearance and weight distribution out.

if both ends of the CV (i.e. the hub end and g/box end) are paralell, what is the maximum angle a CV joint will operate safely without excess wear/binding, and will a compounded angle (i.e. drooped and pushed foward/back) have any major drawbacks?

It totally and utterly depends on the CV. Stock Porsche 930's run up to about 28 degrees. I run mine to 32 degrees with moly cages and polished races. However you are loosing a lot of power at that angle and I have to rebuild them every 10 or so race hours.

Combi are supposed to run up to 18 degrees, so I suspect a stock car would bind at somewhere between 12-15 degrees and a 4x4 about that of a Combi (18 degrees).

In regards to compounded angle so long as you dont exceed maximum CV angularity you're fine. However it will rob you of a small amount of power. The Bunderson runs the transaxle slightly forward of the hubs without issue.

In regards to height, don't dismiss droop. The Bunderson runs about 50-50 compression / droop however if I could run more droop at the cost of ground clearance I would... just ensure you have a good bash plate.

As an aside you may want to have a look at the ORANZ rule book. Its pretty simple to make something comply and you could have a tonne of fun rubbing nerf bars with a similar truck, buggy.

http://www.oranz.co.nz/artman/uploads/o ... k_2006.pdf

[Akane]

You can always run a longer CV, which drops the angle it has to bend for the same height movement on the suspension.

[RedMist]

You can always run a longer CV, which drops the angle it has to bend for the same height movement on the suspension.

Don't you mean longer axle? and thinner (or shorter overall length if stub axle included) CV?
Or you could increase axle length and custom mount the stub.
Bunderson runs a 2.2mtr wide rear track and only manages about 20 inches before the 930's bind. I race with 18 inches of rear travel.

[RedMist]

In regards to height, don't dismiss droop. The Bunderson runs about 50-50 compression / droop however if I could run more droop at the cost of ground clearance I would... just ensure you have a good bash plate.

I should have asked what on earth you want to use this for. If its rock hopping then you probably want to run less droop and more ground clearance. If its traction and lumpy stuff at speed then my statement about using as much droop as possible stands.

[fangsport]

Daniel, i was hoping you could shed light on the subject.
i have previously read most of the rules for ORANZ specification, and will need to cross their rules, with those of Sch.A. it is my intention of upgrading the running gear at a later date to either turbo Leone or RS Leprosy and use it for gravel hillclimbs.
at this stage it is a budget build with the bits i have, so i can teach my 7 year old how to drive like a loon . as go-carts are very limited as to where they can be used, they have been ruled out for a year or two, until he can handle a gearbox cart.

[RedMist]

Daniel, i was hoping you could shed light on the subject.
i have previously read most of the rules for ORANZ specification, and will need to cross their rules, with those of Sch.A. it is my intention of upgrading the running gear at a later date to either turbo Leone or RS Leprosy and use it for gravel hillclimbs.
at this stage it is a budget build with the bits i have, so i can teach my 7 year old how to drive like a loon . as go-carts are very limited as to where they can be used, they have been ruled out for a year or two, until he can handle a gearbox cart.

FANTASTIC, its about time someone created a cross platform car! (I have one in mind, but its something special to replace the Bunderson) I could wax lyrical how in a demonstration put on by myself and another offroader at the Ashley hillclimb how we wasted all the 2WD cars and scored highly in the 4WD, the other compeditor running a worked G13 managed 3rd quickest of the day. We werent invited back for another demonstration

You'll find the regs for ORANZ vague at best but a Schedule A cage will surfice for ORANZ. Being 4WD and front engined you'll be in either of the two truck classes (mid or rear engined and 2WD only for buggies)

If you're space framing the car you'll probably want to look at quite a few buggies before you build and perhaps create a basic wire frame model. The Bunderson is always available for your viewing pleasure and my very basic engineering knoledge is also for hire for the princely sum of a glass of soda water (I'm on the wagon at the moment) Give me a yell next time you're up 03 3236599.

[fangsport]

FANTASTIC, its about time someone created a cross platform car! (I have one in mind, but its something special to replace the Bunderson) You'll find the regs for ORANZ vague at best but a Schedule A cage will surfice for ORANZ. Being 4WD and front engined you'll be in either of the two truck classes (mid or rear engined and 2WD only for buggies)
If you're space framing the car you'll probably want to look at quite a few buggies before you build and perhaps create a basic wire frame model. The Bunderson is always available for your viewing pleasure and my very basic engineering knoledge is also for hire for the princely sum of a glass of soda water (I'm on the wagon at the moment) Give me a yell next time you're up 03 3236599.

who said anything about front engines, Mr Mist
will be space framed. i have looked at heaps of them on trade-me, and the only well-designed ones are single seater, and looked like too much hassle to widen them.

[RedMist]

who said anything about front engines, Mr Mist
will be space framed. i have looked at heaps of them on trade-me, and the only well-designed ones are single seater, and looked like too much hassle to widen them.

Sorry, you're quote in regards to Leprocy.... so its a middy then.... mmm we need to talk.. have emailed you.

[fangsport]

who said anything about front engines, Mr Mist
will be space framed. i have looked at heaps of them on trade-me, and the only well-designed ones are single seater, and looked like too much hassle to widen them.

Sorry, you're quote in regards to Leprocy.... so its a middy then.... mmm we need to talk.. have emailed you.

no, it's a rear.
you have PM!