monster 620 bore increase

[clubhousemotorsports]

Just a quick tape measurement has the long manifold being double the length of the injected manifolds (5" vs 2.5") The long manifolds also do have a pretty good bend in them to transition from the downdraft carbs so on the vertical cylinder the charge has a good bend and then 5" to the head before the bend into the combustion chamber.

Anything that helps flow will benefit at higher revs, most porting gains are really felt up top where the oem drops off.  Thing to be careful of is opening up the port too much as it can cause a drop in Velocity and kill flow as well. We used to see heads from a well known tuner that were just bored to such a size on the bike they did not flow enough as the velocity was not there, they looked nice though.

I did have the test bike carry on high rpm with no porting but pods so there might be something there. I just need time to play which I do not have this time of year. Maybe come August things slow a little.

[koko64]

Yeah  I was looking at increasing inlet tract volume and trying to create a more tapered effect. Note how the ie manifolds are tapered and some even have a bulge to increase volume. I think if you include the alloy casting protrusion it adds to total inlet tract length. I havent measured from butterfly to valve. Pity I cant discuss this over a beer.

[DarkMonster620]

found this listed

http://www.ebay.com/itm/Ducati-Performance-Camshafts-racing-cams-1000ss-DS-SportClassic-Paul-Smart-/222180427711?hash=item33bafc47bf:g:xQgAAOSweWVXf6Wm&vxp=mtr

[koko64]

Snap 'em somebody.

[clubhousemotorsports]

Not bad, worth having if you have a 1000/1100.

[koko64]

1100 cams identical to 1000 or shim adjustment needed for shaft length? I think they're a smidge hotter than evo cams with a little more lift and duration, but close.

[Syscrush]

I clicked this thread expecting to see the 620 owner scoffed at for wanting to mod an entry level bike instead of just selling it and buying up.

But this is way, way better. 

[clubhousemotorsports]

Syscrush
I have always looked at it this way ...........

If you cannot build you buy
If you cannot buy you build
If you cannot stop yourself from building become a mechanic and build other peoples stuff with their money.

[DarkMonster620]

Syscrush
I have always looked at it this way ...........

If you cannot build you buy
If you cannot buy you build
If you cannot stop yourself from building become a mechanic and build other peoples stuff with their money.

true . . .unless, locally some of the tools or processes are NOT available

[DarkMonster620]

eric, sent you a pm

[koko64]

I went to option 3 .

[clubhousemotorsports]

I started with #!
switched to #2
went fully nutz and got to #3

[DarkMonster620]

I started with #!
switched to #2
went fully nutz and got to #3

this was my route too . . but, I must let someone else do it if I don't have ALL the tools or processes

[DarkMonster620]

Well . . found a possible 800 donor engine but, I would use my 620 cases to keep engine # and not have to re-register a new engine . . . Also going for ECU  . . .

would have an 800 mild hc engine under the cloack of 620 cases . . . 

[koko64]

went fully nutz and got to #3