HeadSmess
Well-Known Member
- Local time
- 5:25 PM
- Joined
- May 17, 2010
- Messages
- 3,048
making things. i like making things.
i guess i should just make my own thread of silly things ive made, for and related to the area of motorized bicycles.
good for me too cus ive never really catalogued or taken notes.
my harddrives a mess. random pics here there and everywhere...
so this is a bit of a kick up the chute for myself to get me off my butt and making these things.
ill also accept sensible suggestions within the realms of possibility. custom work...
so.
regards squish bands. i vaguely mentioned having some 80mm billet and a mill.
so, my results so far...
one hemisphere. so far so good. more of a semi hemi sphere... probably a radius of 18, and about 5 deep... so a slice of sphere... 2.2cm^3 apparently, if my labware can be trusted. eep. that is...lemme see... 2/3 of 48...32... way high. ima gunna blow! i need a tighter hemisphere me thinks more volume!
um... been stuffing round trying to cut fins today. went for 8mm cutter. try out a new plan on the next one takes a while to try out each layout.
but! 90 % finned...
went for a neato angled fin look ignore the four extra stud holes where the drawing messed me up... grrrr. 2mm out. grrr. it wasna me!
im hoping the mechanic has a standard plug tap. or a helicoil. or someone has one. cus i sure dont.
there may be a tapped hole in the centre but thats just cus the billet had a previous life... its wrong pitch, diameter, everything.
um. i can mill threads but it involves destroying a tap for a cutter and using a weird program with gremlins. but then they can be indexed.
until then theres not much more to add.
got a squish of about .65, seems pointless when the piston is chamfered at the edge, but hey... i tried matching the chamfer a lil bit? hard to do without recessing the head a bit, or shave cylinder. chamfer is deep, cylinder has a radius at the top edge. crown only just emerges from cylinder.
i do have to shave a cylinder down to the edge of the chamfer, but for now, im just looking to see what gains i get on a stock motor...
yes, its a 48 head. yes, ill be looking at making them on a regular basis. round, square, whatever. this is a trial only. play around with plug types as i get more taps. like D or C sizes...
part of the reason i was contemplating a water cooled head was that...its going to be painful holding this thing now the fins are cut... unless i make that jig i was contemplating to hold heads with. means a new head to try a different hemi...
next thing in the pipeline is a dyno of some sort. it will share one characteristic with real dynos...the readings wont be real figures but as a guideline only. simple alternator will do it big fat heavy load resistor, variable voltage to field windings, read current/voltage running through load resistor. raise voltage at field windings until the thing stalls
pipeline, pipeline... a two speed shift. not running through the derailleur.
chain tensioner bracket clamp thingy cus ive lost way too many spokes in the past due to that thing slipping.
a nikasil cylinder. surely its possible?
a water cooled head cus i got a lil baby radiator and water pumps can be made easily.
more tuned pipes of various rpm.
erm. its finished while writing this...
heh heh heh. i fore see detonation, a nasty peaky powerband, clutch slip when starting, and overheating it really wont like my pipe! guess i find out in a day or two.
:freak:
i guess i should just make my own thread of silly things ive made, for and related to the area of motorized bicycles.
good for me too cus ive never really catalogued or taken notes.
my harddrives a mess. random pics here there and everywhere...
so this is a bit of a kick up the chute for myself to get me off my butt and making these things.
ill also accept sensible suggestions within the realms of possibility. custom work...
so.
regards squish bands. i vaguely mentioned having some 80mm billet and a mill.
so, my results so far...
one hemisphere. so far so good. more of a semi hemi sphere... probably a radius of 18, and about 5 deep... so a slice of sphere... 2.2cm^3 apparently, if my labware can be trusted. eep. that is...lemme see... 2/3 of 48...32... way high. ima gunna blow! i need a tighter hemisphere me thinks more volume!
um... been stuffing round trying to cut fins today. went for 8mm cutter. try out a new plan on the next one takes a while to try out each layout.
but! 90 % finned...
went for a neato angled fin look ignore the four extra stud holes where the drawing messed me up... grrrr. 2mm out. grrr. it wasna me!
im hoping the mechanic has a standard plug tap. or a helicoil. or someone has one. cus i sure dont.
there may be a tapped hole in the centre but thats just cus the billet had a previous life... its wrong pitch, diameter, everything.
um. i can mill threads but it involves destroying a tap for a cutter and using a weird program with gremlins. but then they can be indexed.
until then theres not much more to add.
got a squish of about .65, seems pointless when the piston is chamfered at the edge, but hey... i tried matching the chamfer a lil bit? hard to do without recessing the head a bit, or shave cylinder. chamfer is deep, cylinder has a radius at the top edge. crown only just emerges from cylinder.
i do have to shave a cylinder down to the edge of the chamfer, but for now, im just looking to see what gains i get on a stock motor...
yes, its a 48 head. yes, ill be looking at making them on a regular basis. round, square, whatever. this is a trial only. play around with plug types as i get more taps. like D or C sizes...
part of the reason i was contemplating a water cooled head was that...its going to be painful holding this thing now the fins are cut... unless i make that jig i was contemplating to hold heads with. means a new head to try a different hemi...
next thing in the pipeline is a dyno of some sort. it will share one characteristic with real dynos...the readings wont be real figures but as a guideline only. simple alternator will do it big fat heavy load resistor, variable voltage to field windings, read current/voltage running through load resistor. raise voltage at field windings until the thing stalls
pipeline, pipeline... a two speed shift. not running through the derailleur.
chain tensioner bracket clamp thingy cus ive lost way too many spokes in the past due to that thing slipping.
a nikasil cylinder. surely its possible?
a water cooled head cus i got a lil baby radiator and water pumps can be made easily.
more tuned pipes of various rpm.
erm. its finished while writing this...
heh heh heh. i fore see detonation, a nasty peaky powerband, clutch slip when starting, and overheating it really wont like my pipe! guess i find out in a day or two.
:freak: