Bobs 2024 Build Off Build

[Master Hack]

2lbs for a 1” bearing?

8 oz for the bearing, 1.5 lbs for the cast iron foot.

 

[Whitetrashrocker]

I hope your gonna put a 420 in there. I dunno if a 212 is gonna have enough beans.

 

[bob58o]

212cc
NR 280- series cam (0411 I think, 104 Intake Center Line, 111 degree lobe separation angle)
10.5 :1 CR
E-85
AMR300 Stoppid Fan
Maybe 5-10 psi boost
30mm Flatslide Carb
TAV2 with 7” Driven
I think it has13” tire in the rear
42T 1/2” pitch sprocket
Maybe a 8T front sprocket

5.25 :1 sprocket ratio
13” Tire
7” driven
with range 3.13 to 1 in Low to 1.12 to 1 in High
16.4 : 1 in lowest “gear” (3.13 :1)
5.9 : 1 in highest “gear” (1.12 :1)

I believe I wanted cruising RPMs above 5k RPM to make enough voltage to charge the battery, but under 6500 RPM so the Kohler cast flywheel is less likely to fall apart.

in High Gear. 5.9 :1
5000 RPM is 32 mph
6500 is 42.

I think I have a rev 6500 limiting coil

I should have the beans for 40 mph I hope… Then maybe try a bigger front sprocket if I can.

 

[bob58o]

I asked Russel for 0411 so splitting the difference between the two listed here…

 

[bob58o]

3.5lbs for 16” x 1” axle
1.5lbs for 16” x 5/8” jackshaft

 

[bob58o]

7 lbs Rear wheel plus tire
4 lbs 7” driven unit
2.5 lbs brake rotor and carrier
1.25 lbs rear sprocket and carrier

 

[bob58o]

2.6 lbs front hub and rotor
3.7 lbs front rim

 

[Master Hack]

Now l done it!

 

[bob58o]

9 lb super blower
6 lb front tire

 

[bob58o]

Now l done it!

My scale only goes to 25lbs

 

[bob58o]

I think that’s about 108lbs so far
Then still got to add forks, handle bars, engine, 2x hydraulic brake calipers, 16AH battery, gas tank, fuel pump, seat, lines, wires, bolts, chain, belts, lock collars…

Maybe 200 lbs wet plus me at 175 lbs =

375 lbs

 

[Master Hack]

I asked if you had figgerd the final weight. All i really wanted was yes or no.
documentation is not required.
If yer scale tops out @ 25 and you have something that weighs more, then just weigh it twice.

don't forget to weigh the nuts, bolts and washers and any other hardware, fluids, paint etc.

 

[bob58o]

The curb weight of a Honda Trail 125 is 256 lbs with 1.4 gallons of gas… so we are less than that. I believe they get around 100 miles per tank… 70 miles per gallon ?

 

[bob58o]

Of course 212cc has beans enough.
How big is that sprocket?

 

[Denny]

I’m guess the steel frame alone will probably weigh close 60 lbs naked.

Christ! Harley frames don’t weigh that much!

 

[Denny]

It's plenty stout!
Thats the way I build, tough, but heavy!

That’s the way I like my wimmin!

 

[bob58o]

Christ! Harley frames don’t weigh that much!

Heft is required for low speed momentum.
P=mv

If velocity is slow, we need all the mass if we are going to move the wall we crash into.

 

[bob58o]

“Heavy is good. Heavy is reliable. If it doesn’t work you can always hit him with it”

Got to love Guy Ritchie lines. Lol

 

[bob58o]

I got a notification from that welding sub Reddit after my post. These are the internet’s only worthy welds.

 

[Denny]

Those are tig welds. Yes they are darn near perfect.