V990 | Moto-Abruzzo

It seems that over the years several Caponord and other bike/car related websites have ported themselves over to Facebook – such that I eventually capitulated and joined, albeit in a totally locked down way. And of course over those years I’ve been inundated with zillions of worthless adverts ….. until now. One has proved very worthwhile indeed!

More specifically – JB Fabrications – who were advertising an engine mount adapter specifically for the V990 engine. At £48.45 including postage I was in. Working on a lump like the V990 on a workbench (or the floor!) is a real pain -literally! I’ve spent more time than I care to recollect having to drop tools mid-job simply because my back has tweaked up because of the awkward position I’m working in. This adapter will apparently work with Clarke and Sealy engine mount stands – I chose the Clarke CE340, which can handle engines up to 340Kg (V990 = 65Kg). This stand allows the engine to be rotated 360º and locked off at 45º increments.

The adapter only took a few days to arrive. It was well packaged and the paint finish and welding all appear to be decent quality. The engine stand took a few days longer to arrive, but to be fair it was ordered later! Assembly took about 30 minutes with a crafty tea-break thrown in. This of course, is all well and good …. however the engine has to be lifted about 1.5m into the air to get it into the adapter, and that’s no easy task at nearly 70Kg.

Thank goodness there is an electric workshop hoist to hand – rated at 150Kg/300Kg capacity. This is mounted to a cross-beam in the workshop and is more than capable of lifting the engine nicely into place, especially when using the 300Kg setting as this reduces the raise/lower speed by half – handy when trying to jiggle a bolt into position. Of course It also comes in rather useful for doing other bike related tasks as well!

If all goes to plan, later this year the second Rally-Raid that’s currently being rebuilt, will finally get a motor installed. The plan is to use a big-bore motor …. an 1,103cc in place of the standard 998cc. The compression and valve timing will remain bog-standard Caponord (10.5/1 Inlet timing – 25°BTDC/37°ABDC and Exhaust timing – 57°BBDC/5°ATDC). However to accommodate the increase in air-flow, I’ve decided to use Futura 51mm throttle bodies instead of the Caponord 47mm items.

Meanwhile on top of this chunky aluminium marvel sits a pair of velocity stacks. These stacks vary in height (and diameter) depending on the intended tune of the engine. The RSV Mille of course is designed as a race-rep and as such wants high horsepower at high RPM – hence 57mm throttle bodies and very short velocity stacks. On the other hand the Caponord was tuned for improved low-end grunt and so has small throttle bodies (47mm) and tall velocity stacks to maintain good gas flow speed at low RPM. The Futura seems to sit firmly between the two!

Now of course I could simply use the medium height velocity stacks straight off a Futura, but I decided to go a different route and print a new pair of hybrid stacks – Caponord height BUT 51mm diameter to fit the Futura throttle bodies. Unlike ABS, Colorfabb Ngen (Co-Polyester) can’t be vapour polished with Acetone, so I’ll have to sand the venturi down with a variety of grades of wet-and-dry up to 2,000 grit and maybe finish it off with something like Quixx plastic polish – if it works on this stuff! Here’s a couple of pics comparing the original and new version – straight out of the printer!

Unfortunately 3D parts (unless made on high-end machines) don’t typically have the same strength as injection molded or machined parts – but they do make great ‘proof-of-concept’ parts! If these stacks prove to be a positive step forward, but not durable enough for the working environment, I can at least get the drawings to the machine shop and have them made in aluminium … but that’ll be a tad more expensive than 85p each off the printer! 🙁

UPDATE

Just had a spare half-hour to rub some 100/400 & 1200 grit paper down one of the stacks and all I can say is – WOW! This material rubs up lovely and probably a couple more sessions will see it through. All the print-ridges have gone and I can’t feel anything but a nice smooth surface that retains a print pattern that makes it look quite distinctive. 🙂

Aprilia Caponord ETV1000 RST1000 Futura Rally-Raid hybrid velocity stack

Tag: V990

V990 workshop engine mount

Hybrid velocity stacks

UPDATE