air cooled supercharging

N

narutoghurl

New member
hi guys, Im trying to find info on supercharging an air cooled duc motor, Ive found lots of stuff on liquid cooled but want to know more about supercharging the air cooled mill. If anyone has any info please submit a post, Im looking to find any info, companies, specifications, size, reliability, and any personal stories would be great, love readin that shit always a good read. thanks in advance
 
Vee Two in Australia, the founder and brains behind it, has 'retired' and sold the business to Sprintex who originally worked with Brook Henry on developing the supercharger for the 'Squalo'.

Since then Sprintex developed a kit for a 1000cc desmodue monster and it is reported that more 'kits' will be developed.

A local bike rag in Oz tested the Monster with the blower on it. The best thing is that it is a straight 'bolt on' E3 compliant kit. No changes are needed to a stock bike.
Amazing gains but the life of a 'standard' motor is expected to be shortened depending on how much boost is dialed up. The test spoken of earlier, around 2 years ago now, had a 50% increase in torque with relatively conservative boost dialed in.

I've been silently waiting for more developments on this but it seems a long time coming. Cheapest and most convenient bolt on HP imo.
 
thanx brett I found a lot of info on the super squalo which i think is built on the 999 but I didnt know they had a SC for the air cooled 1000. the pdf is a real help
 
If you hassle the crap out of me I may have to go through the archives of mags and find that test article, scan it & post it for you. Maybe on the weekend.
 
that would be much appreciated but only if you have fun with it, Im just trying to figure out a few things about SC a air cooled duc engine, the super squalo is pretty damn impressive, 200 hp on what is pretty much a bolt on. Im wondering how much reliable hp could be achieved from a stroked air cooled motor. Im proposing a 1200 cc duc motor but cast pistons, rods etc.
 
The only trouble I see with the reliability is the added stresses it would put on the bottom end of a 'standard' motor. I'd be more inclined to put the blower on first before a stroker kit etc.

Now.... an SPS motor with sand cast cases, Ti rods etc... hmmmm May just keep up with a few 1098's
 
Blowers are actually kinder to the engine than conventional mods to get the same HP gains. This is because bigger HP can be realised at the same or lower rpm. Yes, there is more applied pressure on conrods and bearings but less RPM related stresses. Also the incoming pressurised air has a tendancy to cushion the piston at the top pf the exhaust/intake stroke as well. Blown aircooled motors require different piston to bore clearances than blown liquid cooled motors do. They will also benefit from cam timing with modest duration and very wide lobe seperation angles. Good fuel supply is critical because blown motors burn themselves down VERY quickly if mixtures are too lean. A slightly too rich blown engine will make better power, run cooler and last longer than one that is spot on or a little lean. Spark plug styles, combustion chamber shapes and ignition timing/curve also plays a bigger role in finding reliability in a heavily supercharged engine.

Regardless what you do to gain power it's a classic case of "The light that burns twice as bright burns half as long". Unfortunately there is no way around this.
 
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