Topic: Angle of the dangle

[bwaller]

Does anyone have a good "how to" article on re-angling valves in their collection? Do you plug the old guide hole, weld, both?

[754]

How much angle? What about rocker ratio ? I think it may improve lift..
 I will ask my buddy next week he does stuff like that once in a while..just reseated and put thinstems and porting in an XL 350.

[Bill/BentON Racing]

The GS 1000 valves 36mm and 32mm, in my Pena/Hines engine Byron changed guide angle.  But not sure , but fill and drill sounds about right.

[bwaller]

I've searched and never really found a step by step article.

[Big Jay]

Years ago, we made very large guides for the Suzuki GS motors for spreading the valves. Just move over, machine a new larger hole and install the guide.  Seems the same concept could work for changing the angle.

[turboguzzi]

brent, as you can guess, it's not exactly common practice.... like jay, i think that for the guides it makes most sense to go with bigger outer size so you overlap the gap.
valve seat recesses on the other hand are relatively easy to fill.
i still think that biggest challenge will be to establish the reference point for the axis tilting and shifting,  my choice would be to use the tip of the tappet location when the rocker is mid stroke and rotate the head around that point. easier said than done of course....

[bwaller]

brent, as you can guess, it's not exactly common practice.... like jay, i think that for the guides it makes most sense to go with bigger outer size so you overlap the gap.
valve seat recesses on the other hand are relatively easy to fill.
i still think that biggest challenge will be to establish the reference point for the axis tilting and shifting,  my choice would be to use the tip of the tappet location when the rocker is mid stroke and rotate the head around that point. easier said than done of course....

Absolutely right TG. Thanks Jay for the tip, that could be a good option. I found an aftermarket site selling Norton O/S valves and 2 of 3 options required re-angling valves for clearance. It is done but just not as often as I figured.

I think the best option for now is to maintain angles, install and sink a larger seat for a larger valve and try to use existing pistons.

[MRieck]

brent, as you can guess, it's not exactly common practice.... like jay, i think that for the guides it makes most sense to go with bigger outer size so you overlap the gap.
valve seat recesses on the other hand are relatively easy to fill.
i still think that biggest challenge will be to establish the reference point for the axis tilting and shifting,  my choice would be to use the tip of the tappet location when the rocker is mid stroke and rotate the head around that point. easier said than done of course....

Right....."splayed" valves. That's what they did

[754]

Some people do that kind of stuff  often, but you need a lot of equipment and knowledge to pull it off, and no fear.
I know a guy that does it often, stuff like v twin turned into a single, blowers, turbos, oil pump build to pump more out of lower end on turbo motors , bigger seats, change valve angles, radically weld and reposition ports, cut up cams and reweld them,undercut gears, frame raking and building. He has a dyno to test, did a few bikes fir Bonneville.
 So he is my go to guy to ask questions..but a very busy guy.
 I have a 72 750 head that I pulled the spigots out of, put bigger manley intakes in..was thinking, maybe I should raise the intake ports a bit and make new spigots.... Was thinking to run that by him
 Here is one of his bikes. There is a disc brake inside the front hub.

[turboguzzi]

roger goldammer? he is more a one off a kind guy rather than "a guy", shapes aluminum and steel as if they were pieces of Plasticine, quite unbelievable skills.

[754]

Yeah,some pretty cool stuff coming out of his hands, now we got him hooked on flattrack.
Good rider too...

[Don R]

 I'm sure it's still not reasonable to make a billet head to go with Mike's billet cylinder but wouldn't that be something? Bigger valves, hemi chambers or small wedge chamber for flat tops like the car guys do. Revised intake ports and manifolds straightened up a little to aim at the valve head, rocker ratio changes, of course the frame is a limiting factor, we could eliminate stock carbs and airbox  and revise header angles.
 CNC Technology may get us there but somebody still needs to do a design and find funding. Maybe someday a great re-worked welded stocker could be scanned and 3D printed. They're making new ford flathead parts, so you never know.
   The mini sprint guys have done things they don't talk much about, racing secrets. I've seen welded SOHC intakes with hilborn injectors fed by a cam drive turning a fuel pump and a Vertex mag. That guy even had a race ported sandcast head, every thread was helicoiled.

[bwaller]

To go to that trouble then stand the valves up in a shallow chamber use dual cams and FI. They'd still be old toads and that's what we love about them now!



EDIT; So thinking about it, that's not fair. If someone moves forward with the idea they have my wholehearted support!