alloy rear drums

[terry]

I'm after a pair of finned alloy drums.  I'm looking for good drums with fins intact, still some wear in them.

 

Cheers

Terry

 

[Gordo]

Hi Terry, I see you joined up in 2009 and only three posts, must be some kind of a record. Where are you from, some one might be able to help you if you are close buy. And what kind of zed do you have ? Cheers.

[terry]

Perhaps I should explain my relative lack of activity on the forum.  While I would love to own a 240Z one day I actually have a Morgan plus 8 that I've been modifying.  One of the compliments that can be paid to the Z is that its rear drums bolt on to the rear end of a Moggie (after machining) and improve the brakes markedly, and look a whole lot better than the standard iron bits.  I was hoping that someone has upgraded their Z to discs and would have some bits left over ...  just the drums though, the rest of the brake system is very English and can be kept.

 

I should have said that I'm in Canberra, but don't hold that against me!

 

Cheers

Terry

[Scoota G]

Should be somone around your area with a set, if not i converted my Zed to disc rear and have a spare set.

 

Mark 0four0five2nine8fouroneone

[dat2kman]

I have 8 pairs of alloy finned drums, most at limits or close.

 

If i can find a machine shop, that is capable of turning out the ID, and machining the OD of an apprpriate material, and using a hot oven, heat the drums, whilst sitting the new liner in a deep freezer, then press fit the new into the drum, machine off edge, and turn ID to original spec,,,,

 

,,who would buy these, and what orice is a fair sell price?

 

New finned alloy  drums are all NLA. The cast iron ones are!

 

And most important, WHAT is the most appropriate material to use??

 

Cast iron foundry can supply various thick wall pipe, as can steel mills, but it needs to be a particular composition.

 

Same with front brake discs, what is their correct compsition?

[nizm0zed]

the exact composition is quite a science.

mercedes benz, for example, use a softer compound material in the construction of the factory rotors, combined with the compound of the OEM pad.

The end result is that the rotor is meant to wear quickly (60,000kms average for a set) as it givesa better pad bite and a much higher performance when it comes to stopping the car.

Obviously this is also compensated for in the sizing of the calipers, master cylinder, front rear bias, settings of the ABS ect ect to give the car an overall package.

you can see how changing one part can affect all other parts of the system.

BUT!!! we arent talking modern mercs here, we are talking about a car designed in the 60's/70's

I think you'd find just about anything would work fine, however i would attempt to keep the composition as close as possible to the material used in the factory forged steel ones.

At least you know its close to the same design specs as what was designed for it.

Lets face it though, its not like the rear drums do a lot of work, and if they are on a zed that still has the drums, chances are the owner isnt going to be trying to get the best lap time round Lakeside....

[dat2kman]

I have drums, and, I try to get best lap times at all tracks, in fact, at a couple, i manage to set fastest lap time in races against other exotica.

 

I got drums that have turned blue, othets have cracking pattern like a capital letter H, and others still good at 1 mm past their maximum limit.

Front brakes are marginal in competition, so the Z guys adjust up the rears for rach race, i have been known to pull the handbrake on to first notch to take up slack due to heat expansion.

 

Yes, it would be a certain compdition of items to give us a steel lined drum, anyone have any idea?

 

The cast steel  drums as fitted to other old datsuns would be same material.

[260DET]

Why not machine the inside of old finned drums so the finned part can be removed then fit that part onto new iron drums? The outer circumference of the new drums would have to be suitably machined of course.

 

If the rear drums are overheating I would vent the backing plates and maybe drill holes radially through the drum.