Pics of my H-wing diffusers

[mik_str]

before anyone asks, they work very well.... need less throttle to maintain speed, especially noticeable on uphills, response is better too

[lloydie]

Looks good that


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[Varastorm]

They look interesting.

What inspired this mik_str?

Never seen anything like this before

[mik_str]

Look up Boyesen X-wing on Google and you'll see where the inspiration came from...

tried it for the heck of it, kept it 'cause it works.....

My first attempt was an X-wing design and, after positive results, I followed up with this one (my pal Jack Flash, he of long fuel screw fame, has my original set)

[tony.mon]

Nice and skinny, Mik.
Razor blades would be ideal, but apparently I can't be trusted with those, according to my carer.

I'm still wondering if a similar, or perhaps even better, result might be obtained by using sections of triplewall roofing plastic in the inlet tracts- and for that matter, in the snorkel, too.
Or, even better, replacing the snorkel... I'm thinking of trying this......

Strakes fore-and-aft above the blade in the airbox lid might also help.

Ah, whatever, let's just turbo the damned thing.

[Varastorm]

I love mods like this Mik_ster, big thanks for posting.

I am stuck in tomorrow, here's the plan.

1/ Root around in the shed for the spare set of Ducati trumpets.
2/ Nick a breakfast cereal box (to cut as a template).
3/ Search for copper pipe to cut & flatten as the main wings.
4/ Search for the propene bottle/gun, wire wool, flux & solder.

Is there a reason for a "H" section rather than an easier to make "X" section?

The plan is to make them as long as the trumpet, are there any benefits to making them shorter or longer?

Any guidance would be great

[mik_str]

I am hardly an engineer so I "wing it" (pardon the pun). That being said, I kept the wings short (inside the bell-shaped radius) as this portion is rather intricate and was designed on a flow-bench, so I am assuming its profile is optimized. The goal was twofold:
- straighten out the airflow
- create sub-venturis ( the horizontal blades are very close to the slide, there by creating isolated venturis). As for the H pattern, the X pattern I tried worked well but I wondered would happen if I could add a second sub-venturi (via the 2nd horizontal blade) and , lo and behold, it seems to aid upper-mid-range under part-throttle.

This being said, it may be that the "obstruction" (or lost intake area) caused by the presence of the wings could potentially harm peak power, but I hardly (if ever) rev it to the moon anyhow, so it's of little consequence to me...... I want muscular lows and mids and great response at highway speeds, and my new H-wing gives me both.......

[firestorm_al]

It's worth remembering that downstream of the modified trumpet is a dirty great big throttle butterfly valve. The effect of the throttle valve will destroy the modified flow upstream.

The effects of the flow strightener in the mouth of the trumpet may help the airflow to the throttle valve at very small throttle openings but, in my opinion, it will have a negative effect as the throttle is opened. The throttle valve at large openings will generate less turbulance so you are then relying more on the the turbulant air coming from upstream to ensure mixing of fuel and better burning.

Flow straignteners have been used effectivly in fuel injected engines upstream of the MAF sensors to provide a more accurate measurement but that is all it there for.

Al.

[VTRDark]

Looks like someone has stuffed a couple of cream crackers down your trumpet

Very neat looking job that Mik. How have you attached it to the trumpet or is it interference fit as it concaves inwards.

(:-})

[sirch345]

Thanks Micky for posting up the photo's
A picture paints a thousand words as they say they look like a nice job,

Chris.