I noticed some fellers drilling out the drum brakes....
perhaps for cooling, or to allow brake dust to exit... both? not sure.
just wondering if anyone had any knowledge regarding this.
my cb77 rebuild isn't going to be a restoration, so i'm okay making changes like these if they improve aspects of the bike (the engine is the only thing I'd like to keep as stock as possible)
Drilling a brake drum
Drilling a brake drum
'65 CB77
'66 CB450k0
'93 HD FXR
'66 CB450k0
'93 HD FXR
For cooling and lightness. It was often done back in the day. It works much better if the brake plate has an air scoop on it. Fast Fred taught me another old trick, to drill from the center of the hub, through the metal lining, to reduce weight as well. Everything on the wheels is unsprung, rotational weight, and reducing it helps handling .
davomoto
64 CB77
63-7 CB77 Cafe'
67 CL77
64 CL72
66 CL77 big bore flat tracker
Many others!
64 CB77
63-7 CB77 Cafe'
67 CL77
64 CL72
66 CL77 big bore flat tracker
Many others!
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- honda305.com Member
- Posts: 7818
- Joined: Mon Aug 15, 2005 8:23 am
- Location: KERRVILLE, TEXAS
Gun,
It's really simple. Use a hole saw in your electric drill for the brake drum and regular drill bits for teh backing plate.
try to make sure the holes are evenly spaced and are not cutting through webs. Try where possible to break all sharp corners - sharp edges act as crack propagation points, so smooth/round off edges.
It's really simple. Use a hole saw in your electric drill for the brake drum and regular drill bits for teh backing plate.
try to make sure the holes are evenly spaced and are not cutting through webs. Try where possible to break all sharp corners - sharp edges act as crack propagation points, so smooth/round off edges.
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- honda305.com Member
- Posts: 7818
- Joined: Mon Aug 15, 2005 8:23 am
- Location: KERRVILLE, TEXAS
Lots of folks aren't aware of that. .......lm
<<<Try where possible to break all sharp corners - sharp edges act as crack propagation points, so smooth/round off edges.>>>
<<<Try where possible to break all sharp corners - sharp edges act as crack propagation points, so smooth/round off edges.>>>
teazer wrote:Gun,
It's really simple. Use a hole saw in your electric drill for the brake drum and regular drill bits for teh backing plate.
try to make sure the holes are evenly spaced and are not cutting through webs. Try where possible to break all sharp corners - sharp edges act as crack propagation points, so smooth/round off edges.