GT750 reed intake idea's

[durgam]

Heres my 1996 KX 125 Nick Wey special. The reeds are similar in size ans shape as the A/C reeds from fred, and, they are six petal too.

[tz375]

Thanks Kris, if only the manifold angled down rather than out. I should check out our RS125 Honda for size and shape. I don't think it's close but it's been so long since I looked at it, that anything is possible.

[durgam]

So they will me mounted horizontaly than. even though there quite big.

lets start getting things hammered out and finalized. sowe can all move forward. Im not in a big hurry for the parts as you guys are. my 750 project is further down the road, but im ready to make whatever you need.

with adding plates for the top and bottom, the prices is going up a little. I would like to keep it under $150 for a set. the way things are going more stuff is being added on. So lets get crackin' on this design.

[Suzsmokeyallan]

I prefer not to use an aluminum top plate id prefer the rubber/metal one on that comes with the reed block.
Heres what i have three of, are these like the ones you got from Fred???

[tz375]

Allan, but what is the angle between the manifold and the the reed box?

The issue here is getting it all to fit and those manifolds need the whole box to be mounted higher or to be angled and neither of those are desirable.

Dave,
With your original design, would it be possible to mount 38mm carbs and if so, could we see that again to work out how the heck you managed it.

[Suzukidave]

[Suzsmokeyallan]

Heres the angle from the side view. As you can see its very shallow at somewhere around 10 degress or so even though i have not checked it.
This means the reed box could rise up slightly from perpendicular to the back of the cylinder to give some carb bowl clearance for the clutch hump. Then the slight tilt on the intake would allow the carbs to lean back slightly so their angle isnt too steep

[durgam]

The profile on the reeds is more like the reeds in dave's pic, but the manifold is exactly like yours allen. As long as your manifold has 'Tabs' that reach into the cage itself. The distance across the long side, mount holes is 82mm.

[Suzsmokeyallan]

Yes Kris the C/L to C/L across the long distance on my reed cage is as your measurments at 82mm.

[durgam]

tomorrow ill check the Angle of that manifold from the flat side. Ill post the info in the morning.

[tz375]

Dave,
That's not your motor. You trying to lead me astray again? My mother warned about strange men trying to do that.......

OK so Steve's carbs clear the hump, and that's a drag racer, so fuel spills and weeps are not an issue for his application.

The A/C manifold measures up at 4 degrees according to my little digital inclinometer.

That is probably not enough, but it's all speculation until Kris draws up what he has and I check it on a motor.

All I can tell for sure is that the steeply angled boxes from a Polaris with angled manifolds works. We know that Dave's works for his downdraft EFI setup. Now we need to draw this up and see what clearance issues we have - or don't have.

Allan, that is what we are trying to do. The reeds will be at an angle to raise the centerline of the carbs and then tilt the carb back slightly so that it's not much more of an angle than stock. Just like Dave's rather crafty mock up whicjh looks suspiciously like a Yamaha.

My reed blocks are quite steeply angled and that works fine with my setup but won't work with the A/C setup until we get the right angles.

Kris,
when you have the first draft of the boxes, would you please send me it as a pdf or something I can print out and I'll work out the face angles. We do need to minimize the volume of dead air in there too. Let's work with say 10mm lift on the reed tips. You may have to bend the stops slightly from their stock positions to get that. They seem to vary a lot.

[tz375]

This is what I got.

GT750 barrel is at 12 degrees to vertical. We put the reed block on at 12 degrees and the manifold will bring the carb back to 20 degrees to horizontal.

If Kris can draw that up, I'll see if it works.

[durgam]

Im on it.

[durgam]

If the motor is at 12 degrees, shouldnt the carbs be angled back at 12 degrees to be at vertical? Im going to draw this up to mount perpendicular to the cuylinder, and have the reed mount face angled.

[Suzsmokeyallan]

No Kris the carbs cant be level as the clutch hump creates an issue for the right side carb so they have to be high enough and canted forward just enough so that one clears it. Then the other two have to follow that placement to be symmetrical.