Re: Flywheel turning question(s)

[Victor Tikhonov <vtikhono@lsil.com>]

Jon,

The specification for your 5135WS14 says allowable weight on the shaft
end to get rated front bearing life time is 8 kg (~17.64 lb), I'm quite 
surprised to see it less than for less powerful 5133 (10 kg), but that's
the fact. So I definitely would encourage to thin down flywheel as 
much as possible for safe operation up to 10k rpm. Siemens engineer 
said, if the weight is more, no big problem and everything would 
certainly work (just get it *well* balanced), just life time can't be
officially guaranteed. 

I've called a few places where they deal with parformance and racing 
clutches trying to get an idea how thin is still safe. No one gave me
the numbers of course, but one man said they do make flywheels out
of aluminum (I guess with retaining steel "insert" portion providing
friction). If you can't get the weight down close enough to 8kg,
consider this option. He did mentioned the type of aluminum they use
to duplicate cast iron flywheels - I believe I wrote it down
correctly: aluminum alloy 60-61-T6.

Anyone in the list with metallurgy knowledge background could comment 
on it and/or suggest alternative material type?

As few experts mentioned here, performance difference with different 
clutch weight is practically negligible, I have simulated that in
software.

Victor.

Jon \"Sheer\" Pullen wrote:
> 
> Er, on my accord pre-machining the clutch assembly is 39 lbs. That's ring
> gear and all.. I'm betting that I'll be able to machine down to 22 lbs, and
> I have a bigger clutch and heavier flywheel than I think the CRX shipped
> with.
> 
> ----- Original Message -----
> From: "Victor Tikhonov" <vtikhono@lsil.com>
> To: <ev@listproc.sjsu.edu>
> Sent: Friday, April 27, 2001 3:10 PM
> Subject: Re: Flywheel turning question(s)
> 
> > Just to clarify:
> >
> > I need to lighten up the clutch unit to <10 kg (22 lb) not for
> > performance sake, it just the motor manufacturer specifies maximum
> > allowable weight on the shaft to maintain specified life time of the
> > motor's front bearing.
> >
> > So I need to do it even though it fits without any modifications
> > and virtually no impact on performance is expected. For expensive
> > motor it's life time is higher priority, it will likely outlast the
> > car and migrate later into new one...
> >
> > Victor
> >