How's it working?
Um... Do you mean Fusion 360 or the bellmouth?
Fusion 360 is fantastic. Really powerful and fairly easy to get your head around.
The bellmouth has moved on. I couldn't fit that ⬆︎⬆︎⬆︎ one in my custom airbox so I designed one that would do:
After a few trial prints to get the inlet radius just right:
Detail shot:
I must get one sent off to TurboPhil for flow testing. The one above ⬆︎⬆︎⬆︎ flowed an extra 5%, I'd hope this one would be about the same.
Looks good, wondering why the fiddly flange on the back ? I can see that creating fitting / gasket problems (they vary)
I would also say the countersunk bolt heads are a good idea, but will potentially cause misalignment with the actual throat
There does need to be some wriggle room as all carbs are not eactly the same, the countersinking will work as a centering point.
I find they need a good 0.75 mm wriggle room on the bolts to align the thoat, which is the whole objective
No wish to rain on your work as its obviously very good, but now is the time to iron out any potential probs
I do like the look of the top curved throat profile, just think they need to be a bit thicker and then use either standard cross head screws or allen cap heads....(nobody will have countersunk 5/16 UNC bolts)
If you are just making a one off it will be fine but for a run of several you need some allowance for the production tolerances SU were not as precise as you
You might also find the lower corners need to be a bit nearer the centre as they will need to fit cone filters, which are tight
Cheers Andrew, valuable input as usual.
This never started out as something to make me a massive fortune' it is a one-off and has been tweaked a fair few times to get the fit spot-on.
The 'fiddly flange' has been through many iterations to get it as close as it is. The idea of it is to smooth the airflow into the carb avoiding any turbulence from the underhang.
It started out designed with Allen bolts in mind but the base had to be so thick to take the height of the bolts that it was getting away from the compact size I wanted to fit in my airbox (or cut the allen bolt heads down). Someone had the idea to use countersunk 5/16 UNC (easy enough to find on eBay) so we went with it. As you've pointed out, this caused problems with the centering action and so brought another design tweak or three...
Point taken about the corners, that's a simple job to get rid of.
How's it working?
Um... Do you mean Fusion 360 or the bellmouth?
Fusion 360 is fantastic. Really powerful and fairly easy to get your head around.
The bellmouth has moved on. I couldn't fit that ⬆︎⬆︎⬆︎ one in my custom airbox so I designed one that would do:
After a few trial prints to get the inlet radius just right:
Detail shot:
I must get one sent off to TurboPhil for flow testing. The one above ⬆︎⬆︎⬆︎ flowed an extra 5%, I'd hope this one would be about the same.
Looks good, wondering why the fiddly flange on the back ? I can see that creating fitting / gasket problems (they vary)
I would also say the countersunk bolt heads are a good idea, but will potentially cause misalignment with the actual throat
There does need to be some wriggle room as all carbs are not eactly the same, the countersinking will work as a centering point.
I find they need a good 0.75 mm wriggle room on the bolts to align the thoat, which is the whole objective
No wish to rain on your work as its obviously very good, but now is the time to iron out any potential probs
I do like the look of the top curved throat profile, just think they need to be a bit thicker and then use either standard cross head screws or allen cap heads....(nobody will have countersunk 5/16 UNC bolts)
If you are just making a one off it will be fine but for a run of several you need some allowance for the production tolerances SU were not as precise as you
You might also find the lower corners need to be a bit nearer the centre as they will need to fit cone filters, which are tight
flange on the back I guess is to do with the radii on the carb mouth. and should help with correct alignment but the countersunk bolts could mess that up.
I see what you're both saying Nick.
I think I'll do another more general design with a bit more 'slop' in the mounting holes for anyone who wants to try printing it.