How many use a special wrench for their knock-off wheels?

Very good question! I think it varies pretty much from car to car. I also heard that today 275GTB's suffer from broken hubs either due to fatigue or perhaps too high torques? The advantage of a hammer is that you clearly hear when the nut secures, as was done in their new days, so I dont think the factory comes with numbers. My racecar has a wheelnut torque of 6-700Nm! But that is a modern car.
Ciao
Oscar

 

Ferrari went from the 42 to 32 hubs and made a very ligth hub,

whitch often broke nowadays and in the past nothing new.

a simply wrong construction.

They had to ask Napolis first in those days, he knows how to produce for the eternity!

Mac- users cannot place a smile dont know why.

C.

 

http://www.roelofsparts.com/rp/index.php?option=com_productbook&func=detail&Itemid=32&id=128

Problem solved.


C.

 

You just gave me the Idea to ask Ferrari Classiche and they told me 550Nm for my car!
;o)

 

Type : ) wothout space between.



Speaking of hubs the ones on my 88 TR went after six years on the Cross Bronx Expressway and a wheel came off. We had a talk with Ferrari and they re-engineered them.

 

Somewhere I got 325 ft.lbs. in my mind for a 330 GT (size 42 hubs) from way back when I bought it in '82. I've tried to find where I read it, but can't find the source. The 550nm is 405 ft.lbs. Somewhat higher than what I remember, but not out of the question.

I use a torque wrench for the 325 and have never had to re-tighten except for a precautionary check after a few miles of driving. When I used a dead blow hammer, I would have to to keep re-tightening. So I don't think that it was getting them tight enough.

 

i was told the knockoffs "self tighten" when driving. so an initial torque of 225-250 lbs should be plenty. it takes a lot of strikes to get to 250lbs w/ a lead hammer.
ed

 

Sorry to point it out, but this again proves that there's a lot of misinformation out there. Or perhaps misinterpretation of information ?
Timo

 

timo, are you saying that the knock offs do not "self tighten"? what is the correct torque lbs for 42mm knockoffs?
ed

 

Yes, I've also heard that knock-offs should be tightened as much as only possible. Defninitely NOT so.

If they are not tightened properly, the splines will wear out, if too much, the thread on the hub will pull out.

Best wishes, Kare

 

In my experience, they do not "self tighten", but may loosen if not properly tightened.
For torque, I've been using 325 ft.lbs. successfully, but to accurately achieve that, I use a high quality torque meter* (with +/- 2% accuracy, both direction), not a wrench, which most have 10%-15% accuracy, but usually only to one direction (RH thread).

*A good one will set you back about $800.00 - $1000.00(?), but IMO, well worth it.

 

For what's worth, I just checked my torque meter I've used for past 15+ years and specifically bought for wheel tightening on vintage Ferraris, etc and apparently it's designed with 1% accuracy, both directions, instead of 2%.

 

Are Daytona hubs 42mm
or 52mm
Just measured one of my Cromadoras
52mm
Is that correct

 

42

 

Are you sure

 

I measured the diameter of the splined hole and it looked like 52mm
Thanks

 

i think its stamped on the knockoff

 

Laurence, the 42 and 52, etc. are not metric measurement, they are Whitworth designations based on other measurements. For example, the Daytona is a 42 hub, the 275GTB is a 32 hub, the 375MM is a 52 hub, etc.

john