Scaffolding poles + old VW bits + Rotary engine....
Discussion
PhillipM said:
We had them fitted on old CV's just for testing, we need to get the new CV's built up and - as you might have guessed - even our CV's aren't exactly off the shelf items - the casing is as it's just a GKN Porsche casing, but the centre/splined section gets replaced with a tougher hardened chromoly version, which has one side of the 'window' for the shaft machined out to allow more angle without it hitting the shaft, and then the balls are replaced with 0.001" undersized versions to reduce heat buildup and allow things to move a little easier under high misalignement - although we might not bother with this as we're not running as much angle now.
The whole lot is hand polished inside for crack/wear resistance, especially the splines on the driveshafts as they slide on the CV centres to allow enough plunge, then filled with a specialist grease - an aluminium complex with about 10x the molybdenum content of your normal motorfactor CV grease - and the boots are bonded on with polyurethane as otherwise they weep even with clamps on, and the driveshafts need covering with a bonded rubber/polyurethane sheath that stops them getting chips from rocks that can initiate a crack and failure down the line.
We like to make sure everything we can do ourselves is done to make 'em survive! To be fair it's not really a long job, just not a 'take off shelf, bolt on' one.
These bits of insight are really interesting - thanks!The whole lot is hand polished inside for crack/wear resistance, especially the splines on the driveshafts as they slide on the CV centres to allow enough plunge, then filled with a specialist grease - an aluminium complex with about 10x the molybdenum content of your normal motorfactor CV grease - and the boots are bonded on with polyurethane as otherwise they weep even with clamps on, and the driveshafts need covering with a bonded rubber/polyurethane sheath that stops them getting chips from rocks that can initiate a crack and failure down the line.
We like to make sure everything we can do ourselves is done to make 'em survive! To be fair it's not really a long job, just not a 'take off shelf, bolt on' one.
threadlock said:
These bits of insight are really interesting - thanks!
Certainly a careful job, everything has to be blued and checked along the way as if you take a knats too much off somewhere then because of the high stiffness of the parts you're dealing with, you load just one CV ball up instead of all of them - then everything goes pear-shaped, probably literally when it comes to the CV balls...
Anyway, getting away from oily bits, engine internals, CV's and all the mechanical bits, and off to some of my famously terrible Paint skills:
I'm not sure I like it, but it looks a lot better than all just flat red - I am open to suggestions, especially if anyone wants the original larger image to do a better PS/Paint attempt. Ignore the red mudguard top mounts, just the selection tool gone rogue. (Rouge? :P )
The louvers were supposed to be red on top and silver underneath but it went terribly wrong
I'm not sure I like it, but it looks a lot better than all just flat red - I am open to suggestions, especially if anyone wants the original larger image to do a better PS/Paint attempt. Ignore the red mudguard top mounts, just the selection tool gone rogue. (Rouge? :P )
The louvers were supposed to be red on top and silver underneath but it went terribly wrong
Edited by PhillipM on Tuesday 26th January 18:45
Munter said:
Will the angle of the roof not deflect air over the scoop? A little like an aero screen on a caterfield?
Yup, the bottom half of the scoop is basically doing nothing over about 30mph or so, boundary layer is quite thick.But that's fine, it's oversized for low speed cooling and to allow air drawn through by the fans when stationary to cool the charge air if the launch control, etc, is running. Hopefully at higher speed it won't need that much area and the higher effective expansion ratio behind the scoop inlet will stop it from stalling.
However, this lot is mainly from theory and simple 2d aero modelling, so it may do nothing of the sort
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