rear drum question (width??)

[vibrating_Cake]

Right, i give my car that much shit ive boiled the rear drums until they set alight! (as in on fire)

 

but... i have got std 2.0 laser rear drums... and the 2.8i rear drums use a lot wider shoe (nearly twice as wide!!!)

 

now... how much difference would this make to....

 

1. the power of the rear brakes

2. the amount of heat the rear drums can take (compared to the 2.0 ones) before burning up (quite literally!)

3. should i just shut up, stop being a whining git, and get along to make some brackets for a rear disk conversion

[danny69]

Bearing in mind that Capris used to race with drums even over long distances I think it must be possible to get away with larger drums and good linings.

You could fit a bias valve to reduce preesure to the rears OR fit rear cylinders with a larger bore to reduce the rear effort that way perhaps.

[bortaf]

Larger shoe surface area will allow more energy conversion (kinetic into heat i think the techy term is ? ) and larger drum size will allow that heat to dissapate quicker/easyer.

TBH all i ever do/did to rear caliper equiped 5ierras and grannys is unseize the dam rear calipers, they do so little work that the consation never gets a chance to boil off and they rust internaly, actually that goes for most vehicals with rear discs, just had to unseize the rears on a Lucida and that's a heavy people carryer, same problem.

[vibrating_Cake]

Bearing in mind that Capris used to race with drums even over long distances I think it must be possible to get away with larger drums and good linings.

You could fit a bias valve to reduce preesure to the rears OR fit rear cylinders with a larger bore to reduce the rear effort that way perhaps.

 

 

i have my balance bar, but i'd prefer to get maximum braking effort from the entire system, at the time i killed the rear drums i admit i did have a lot biased to the rear... but it was set when weather conditions were 100% dry and sunny, to the point JUST before the rear wheels locked.

plus a turn on the bias bar!

 

so they are doing the maximum they need to be doing, without locking up at all (thus making the overall deceleration of my car better) because all 4 tyres are justabout reaching their limits.... rather than me whacking more bias on the front of the system, and ending up locking the fronts up in the wet all the time.

 

 

sorry im a little bit of a perfectionist at these things =o) but 283mm fronts and standard drums on the rear...

was just thinking would the wider 2.8i drums be "enough"

bearing in mind i do go trackdays in the car often!

[zimbabweanford]

hey there... well the old Capris, Escorts and cortinas used to race with drums on the back and I've known of some racing drivers that would race their older cars with drums all round for short sprint races as drums actually have a better braking efficiency than discs due to the fact that the shoes have a bigger contact surface area than pads and discs meaning better braking.. but personally you should be running about 70% to 80% braking to the front on a dry track and only when it is wet would you take the bias to the back or on loose surfaces eg gravel...