Good Evening,

The drums on my '72 240Z are worn beyond resurfacing and need to be replaced.

I took this out of (not off of) a 240Z in a junk yard last week. (The aluminum drum I spent 45 minutes wrestling off was, alas, about 10 inches inside diameter -- or might as well have been.) The bolt pattern seems to fit and the Max. Dia. statement is the same as on my existing aluminum drums, indeed is in the same typeface as well. I admit utter confusion regarding stock drums. I've heard that stock were cast iron, with aluminum as after-market performance, and that stock was aluminum, and finally that stock was cast iron then switched early on to aluminum.

So what am I looking at here? If its not clear, there is a part number (?) stamped 6X07A at 2:00 O'clock on the drum. An original? An after-market replacement? Something for the Mars Lander?

If it is for a Z, I have yet more questions. This sucker is heavy, way heavier than the aluminum drums I have. Would using a pair of these increase the unsprung weight to such a degree as to make the car ride or handle noticably worse? How about, maybe this would be just plain stupid, using one cast iron and one aluminum drum?

Chris

The factory drums are aluminum with a cast iron insert for the brake surface. The nominal diameter is 9 inces. The maximum service diameter is 9.055 inces.

The drum in your photo is not an original for a 240Z. If it is 10 inches then it is not even a cheap replacement for a 240Z.

The weight will affect handling but on a casually driven street car it is not likley to be a serious problem.

There is a guy at Datsunparts.com that is either making or has made new drums for sale. Most of it is roadster stuff but there are some Z items. You might want to check his site for pricing.

You might want to follow the action in this thread. We now have a company who does high quality relining of original aluminum drums. He can do fin repair as well.

http://www.classiczcars.com/forums/showthread.php?37396-Anyone-interested-in-relined-Aluminum-drums&highlight=brake+drums

Tiorber and pwd,

I've been letting the brake shoes wear down past usual the usual replacement level for several months now as my drums were past resurfacing specifications anyway, so I couldn't really cause them any damage. Having been looking for resurfacable brake drums for several months now without success, I'm just about having to throw in the towell and pop for some new ones. Thanks for the info.

Chris