Drilled Rear Drums

[banzaitoyota]

Is anyone running these?

 

[1stgen4evr]

Drilled?

Like drilled rotors? I haven't seen any. Would that help cooling or something?



1stgen4evr

James

 

[DF5152]

i have never seen drilled rear drums but i have seen slotted ones

 

[banzaitoyota]

where di you see the Slotted drums?

 

[John - K5AWO]

My only thoughts on the drilled rear drums is that:



1) brake dust might be able to exit the drums.



2) mud dirt might just as easily enter into the drums.

This would not a good thing.

 

[DPelletier]

As far as I know, there is no such thing as drilled drums. Worked in auto parts for years.



Dave

 

[banzaitoyota]

Actually there is. .



http://www.chtopping.com/CustomRod4/

 

[John - K5AWO]

Well, that is a severely qualified answer. They only exist as modified parts. Not as factory supplied stock parts.



Not sure I agree with the comment that was made concerning "unsprung weight".



The amount of material removed by drilling holes in the drums is going to be an extremely small percentage of the total drum/wheel/tire/axle weight.



In practice the ride quality of the vehicle isn't going to change.



If you drill your own drums, I would just caution that you make sure to keep all holes matched side to side and have one opposite the hole being drilled to keep the dynamic balance forces in check.



Luck to you,

John

 

[ARedetzke]

The weight he was talking about was a car with 4 drums (drilled or not) vs a car with discs all the way around. Drums are lighter than rotors, and wheel cylinders are lighter than calipers, was his argument. I had to read it twice to figure that out. I thought it was BS at first too. Still wouldn't make that big of a difference in weight though.

AJ

 

[JLEONARD]

The amount of material removed by drilling holes in the drums is going to be an extremely small percentage of the total drum/wheel/tire/axle weight.

I agree. Plus since this weight is a small percentage and relatively close to the center, balance is likely not affected in the practical sense either.

If it evacuates a decent amount of heat I can see it helping braking.

Jay