ChatterBox
Has anyone checked out Heystee parabolic springs?? Hes got lots of nice land rover mod stuff...
Cheers Rod
sorry i dont know how to put links in
ChatterBox
SupporterHello again,Originally Posted by alan48
Worth a try, but as suggested I think 4WD Industries and the older Modern Motors are basically the same crowd in a different location.
Back in the day Modern Motors was one of the prime places in the mid Hunter for Series Land Rover parts and service - that seemed to fall apart after Rover was sold off by British Leyland and the network of independents lost their right to sell the cars and/or original parts.
Cheers,
Neil
1975 S3 88" - Ratel
Master
i just called them- no joy i'm afraid.
Super Moderator & CA manager
SubscriberLast week I drove 2 SWB Series land rovers - one after the other. First had standard springs, the second had parabolics. Both had 2 people in them, and not much else. The shorty with the parabolics was soooo much nicer to drive - almost acted like it had coils in it. Can't wait to get mine on the road now they are fitted to it.
Big thanks to Mick88 for the drive of part of his collection.
If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
YarnMaster
What condition were the standard springs in? Well lubricated and shaped on the ends; or a solid block of dry rust?
Please don't think I am trying to be sarcastic, but for this comparison to be relevant, the condition of the standard springs is important,
Cheers Charlie
Super Moderator & CA manager
SubscriberNo dramas and a very good point. - the standard springs had all been pulled apart and cleaned - the vehicle has just recently been put back on the road after a rebuild and engine conversion and are in as good a condition as a new set - very little wear at the ends, etc. Apples for apples comparison - good condition, well maintained standard springs versus parabolics - parabolics won hands down - with no load - can't give you a comparison when loaded but as we spend most of the time driving around unloaded there's a noticeable improvement.
If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
ChatterBox
What is the consensus on running parabolics at one end (front) and conventional leaves on the rear? The rear springs are much longer and easier to get right and multiple leaves are better for load carrying, whereas the front springs are shorter and so leaf spillage (& friction) are much more promounced and harder to get to a supple ride?
C
Super Moderator & CA manager
SubscriberWhat gives you the idea multiple leaves are better at carrying loads? The 101's came standard with parabolics and are rated to a tonne in the back. Early testing showed they were actually good for nearly 1.5 tonnes but the vehicle was designed as a 1 tonner. I've had nearly a tonne in the back of it and it is brilliant with load on them.
Then there's the Merc Ambulances which run just a single parabolic on the arse end and the Transit vans which use parabolic rears too - both newer vehicles, designed to carry loads where engineers have opted to use parabolics.
Given a choice I'd use parabolics on the back any day, I don't think there's any evidence to suggest they aren't up to load carrying duties, quite the opposite.
If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
ChatterBox
Probably the concept of multiple leaves that take up the load with increasing spring pack deflection, vs relying on increasing spring rate of only one or two leaves. Fair point re your examples though 😊.
Chris.
RoverLord
Semi-elliptic springs, such as those used in Series Landrovers need to have their strength tapered from the axle to the ends, as the bending stress on them increases closer to the axle.
The traditional way of of providing this is to use a series of parallel leaves of constant thickness, but varying length. The advantages (A) and disadvantages (D) of this approach are:-
1. The leaves are all made of the same relatively cheap sheet steel. (A)
2. Multiple leaves means less serious if one breaks. (A)
3. Interleaf friction provides built-in damping (A - less dependent on damper) (D - interleaf friction can vary widely from very little with new, oiled, leaves to very high when very rusty or with worn steps inn the leaves, resulting in a rough ride)
So-called parabolic springs are made from a small number (usually 1-4) of leaves, whose thickness is tapered according to the stress along the spring, following a parabolic law. These few leaves are usually designed to touch the adjoining leaf only at a single point at the end of the shorter leaf. They have the advantages and disadvantages :-
1. Each spring design requires a custom roll to make the profiled sheet of steel that is slit to produce the leaves. Unless made in large numbers, this means they are expensive compared to traditional springs (D)
2. Few leaves means a breakage is more serious (D)
3. Little interleaf friction, means almost all damping is from the Damper, and highly predictable (unless the damper breaks or otherwise fails!) (Mainly A, and the reason for their popularity - good ride!)
4. Because the leaf is thicker over most of its length, the surface stress on the parabolic leaf is higher than on a conventional spring. This demands both better quality steel and a better surface finish than the conventional spring, to avoid stress risers that result in fatigue cracking. Perhaps significantly for the roads many of us drive on, stone impacts can damage this necessary surface finish. (D)
Overriding all these advantages and disadvantages may well be the design of the spring. The conventional Landrover springs are designed to operate at rated maximum carrying capacity (and probably more, as Rover learnt early that many owners routinely overload their Landrovers), whereas the parabolic ones may well be designed for the recreational use of the vehicle where, particularly for the swb, little is carried except a driver and a single passenger. Needless to say, this design will be much more comfortable, but may run into problems if you want to use the vehicle one day top fetch a load of pavers!
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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