why are there no 620 headers?

[teddy037.2]

waste of time for the tuners to make spaghetti pipes for the baby ducs?

no need for larger piping?

 

it is the missing link in my sort of uber-620 plans. and that makes me sad.

[swerdna]

I was under the impression that new headers on a 630/750/900 wouldn't improve performance... so... no new headers.

Anyone else has a better, more definitive statement?

[teddy037.2]

I was under the impression that new headers on a 630/750/900 wouldn't improve performance... so... no new headers.

Anyone else has a better, more definitive statement?

exactly.  I'm wondering as to the 'why' of it... are the pipes already optimal dia? is there no need for equal length headers?

I am confused.

[kenrok1]

check here (note, this website is ficle - need to refresh between each doc or it wont load, and best to right-click and save the PDF local rather than try to read online):
http://www.ducati.com/bikes/performance.jhtml?perf=monster

There's a complete Termi low-mount system in the "Engine Upgrading" catalog and a 2-into-1 chrome retro looking system in "Kits"

both seem to be for M900 ~ don't know if they would work with other displacements

[ducpainter]

The 900 headers won't fit the smaller bikes.

I was told by a guy that knows exhaust that the smaller displacement FI bikes didn't benefit from large diameter headers like the carbed bikes did.

He did say a slightly larger tube and equal length was usually good.

That doesn't explain why nothing is out there though.

[teddy037.2]

The 900 headers won't fit the smaller bikes.

I was told by a guy that knows exhaust that the smaller displacement FI bikes didn't benefit from large diameter headers like the carbed bikes did.

He did say a slightly larger tube and equal length was usually good.

That doesn't explain why nothing is out there though.

yeah, something equal length woud be nice...  the only other option I can think of is to go custom, but the chopper shops here prolly wouldn't know a damn thing about proper tuning...

[ducatiz]

That doesn't explain why nothing is out there though.

prob because the cost for the kit would be the same as for a 900 and the gains are not huge.  thus, when ppl upgrade a 620, they just get a new bike.

or, in the case of 2001cromo and IndustrialGrrl, they put a 900 engine in a 620 frame.

[teddy037.2]

bah! motor swapping is the easy/cost-effective/smart way out!

and I am certainly not the easy/cost-effective/smart kind of boy!!!!

[MotoCreations]

The 900 headers won't fit the smaller bikes.

Actually they will if modified.  All 900cc 2V exhausts EXCEPT DS1000/DS1100 (different exhaust port configuration) can be easily modifed by shortening the required amount.  I think the 900 headers need to be shortened in the straight sections of the vertical and horizontal tubes. (typically 5-12mm)  Just cut the section out and reweld shorter.  Exhaust ports in the same location on the head itself.  I've put 900 Termi/Spaghetti systems on 750's and 800's (doublesided swingarms) without problems by shortening as above.

[A.duc.H.duc.]

Actually they will if modified.  All 900cc 2V exhausts EXCEPT DS1000/DS1100 (different exhaust port configuration) can be easily modifed by shortening the required amount.  I think the 900 headers need to be shortened in the straight sections of the vertical and horizontal tubes. (typically 5-12mm)  Just cut the section out and reweld shorter.  Exhaust ports in the same location on the head itself.  I've put 900 Termi/Spaghetti systems on 750's and 800's (doublesided swingarms) without problems by shortening as above.

That's the truth

[ducpainter]

Actually they will if modified.  All 900cc 2V exhausts EXCEPT DS1000/DS1100 (different exhaust port configuration) can be easily modifed by shortening the required amount.  I think the 900 headers need to be shortened in the straight sections of the vertical and horizontal tubes. (typically 5-12mm)  Just cut the section out and reweld shorter.  Exhaust ports in the same location on the head itself.  I've put 900 Termi/Spaghetti systems on 750's and 800's (doublesided swingarms) without problems by shortening as above.

I was referring to a bolt on install Mark.

Not all of us have a tig welder in the shop...

or the skill to weld stainless tubing even if we did.

[brad black]

they used to sell systems for the smaller bikes.  gio.ca.moto used to make some, listed in dp catalogues for a few years.  no one bought them, so they stopped.

you should be able to force a 900 system on, especially ones with lots of joins.  it won't help performance at all over slip ons, it'll cost most likely.  but if it's a visual effect you're after, then that's not so important.

and you might be surprised by how much custom shops know, and how most customers want it done a certain way that's not based on anything much other than looks.

[ducatiz]

Here is one possible solution..

check out a Paso header.  They have the same dimension as the 600s, which I believe ar the same as the 620.

I don't know how you'll fit mufflers on, you might have to get some custom risers made...

[teddy037.2]

Actually they will if modified.  All 900cc 2V exhausts EXCEPT DS1000/DS1100 (different exhaust port configuration) can be easily modifed by shortening the required amount.  I think the 900 headers need to be shortened in the straight sections of the vertical and horizontal tubes. (typically 5-12mm)  Just cut the section out and reweld shorter.  Exhaust ports in the same location on the head itself.  I've put 900 Termi/Spaghetti systems on 750's and 800's (doublesided swingarms) without problems by shortening as above.

ok, so at this point my bike has:
750 barrels w/FBF 11:1s (stew=awesome!)
BMC/chopped lid
port and polish
PC3
arrow slip-ons

so it would seem that doing a header mod would be... about everythig I can do to it...    I know a couple of guys who weld, so chopping up a 900 set wouldn't be undoable. still running the motor in, so it hasn't gone on the dyno yet for tuning.

OTOH, something ludicrously silly like a 2-into-2 custom job has crossed my mind as well...

[bullet boy]

ok, so at this point my bike has:
750 barrels w/FBF 11:1s (stew=awesome!)
BMC/chopped lid
port and polish
PC3
arrow slip-ons

so it would seem that doing a header mod would be... about everythig I can do to it...    I know a couple of guys who weld, so chopping up a 900 set wouldn't be undoable. still running the motor in, so it hasn't gone on the dyno yet for tuning.

OTOH, something ludicrously silly like a 2-into-2 custom job has crossed my mind as well...

I've been thinking for some time that a lightened fly-wheel might really perk-up my old 620...