velocity stack designs

[Stephan]

Pilots stayed untouched, I didn't stated clearly, last three changes were only on needle position. Seems like DJ G2 and 1.3mm is the lowest position I can go with pipercross filter, lower is blocking needle jet (or tube) while air is coming more to the main circuit at 3-4k and needle is not lifted enough. G2 and 0.7 or 1mm just didn't work and adjusting pilot screws didn't make it any better. But with other filter it can be different story.

[Varastorm]

nice topic you have. Just for your interest, I am still not finished with my setup, but I am close. The biggest improvement was change from Dr Honda stacks (HRC/HP Power design) to oem plastic short/long. From this change, I feel midrange is much better, and top end maybe as well.

BTw, I am just now struggling low end issues with DJ needles at position G2 + 1mm washers ... I need to solve it but I am not going to file them. Strange is that with approx 1.3 mm washers it was ok but midrange punch is not so strong, you was there ...

I don´t say Dr Honda stacks don´t work, but just in my application, together with my Arrow full exhaust, Pipercross filter and stg1 engine, definitely not.

After reading that Stephan I too changed back to the oem long/short stacks & I also have regained my impressive mid range.

I have been looking into changing stack heights but keeping the Ducati trumpets. Trying to make some the same length as the odd oem's but still using the huge Ducati intake bell mouth. Here are some pictures.









It's only an experiment, so will update when put on the bike

[sirch345]

You're not at it again
Nice work there Phil

Chris.

[Stephan]

Why do you have longer one in front? That's reversal of oem design.

[Varastorm]

You are right they're not on the bike though Stephan

Only set up for pictures on a spare set of carbs & airbox

[Varastorm]

Hey Stephan, I was right. The trumpets are on the right way around

It's the air box that's the wrong way around

[Stephan]

take another look Phil, both airboxes have the same direction :-)

[Varastorm]

take another look Phil, both airboxes have the same direction :-)

The carbs underneath are the other way around though, it was only a quick assemble on the table for some pictures Stephan

Here they are all the right way up on the bike

Might be a waste of time, but we'll see. Will update

[Stephan]

Ok, you got me

[VTRDark]

They look good. Very similar to Mori's. I wonder how much of an affect the wide curved mouth is having.

[bigtwinthing]

you lot are possessed. get Fuel injection ffs

[VTRDark]

I'd still be possessed. I'm sure there's somebody else inside my body. Shame it's not female as I could wombles myslef up big time then

[bigtwinthing]

I'd still be possessed. I'm sure there's somebody else inside my body. Shame it's not female as I could wombles myslef up big time then

knowing your luck you would be gay or if you did have a Girlie inside you,you would not like her

[VTRDark]

Gay....no, I'm too miserable to be gay. No happiness here.