[Fot] Alloy v steel

[Greg Solow]

We have been using aluminum alloy flywheels on the TR-4 engines for over 25 
years. Then engines we have put them on have ranged from 115 hp to 190 hp. 
We have had one (1) problem in that time. I t was caused by the engine being 
consistantly overreved at the Pittsburg Vintage GP. The reves used to cause 
the flywheel to shear its bolts were over 7600 rpm.  Using properly designed 
flywheels and good ARP flywheel retaining bolts of 3/8" diameter, that was 
to only problem we have had.
    By the way, the high rpm stess also caused the front generator bracket 
to break the same weekend the flywheel bolts failed.  On a few of our high 
horsepower engines, we have used 4 or 6 7/16" fasteners instead of the 
standard size 3/8" pieces. Most of the engines
 have used 4 3/8" retaining bolts with #8 flat washers, torqued to 60 psi 
with loctite "nut lock" on the THREADS ONLY.
                                                                             
            Greg Solow



----- Original Message ----- 
From: "Bill Babcock" <BillB at bnj.com>
To: "Tony Drews" <tony at tonydrews.com>; "Jim Cun" <jimcun2001 at yahoo.com.au>; 
"Friends of Triumph" <fot at autox.team.net>
Sent: Monday, November 19, 2007 12:44 PM
Subject: Re: [Fot] Alloy v steel


> I'm not a fan of alloy flywheels, I've had two come adrift despite a lot 
> of
> modification and prep. The steel flywheels are almost as light and seem
> bulletproof. The cast ones can't be lightened enough to be worthwhile. 
> Fine
> for the street.
>
>
> -----Original Message-----
> From: fot-bounces+billb=bnj.com at autox.team.net on behalf of Tony Drews
> Sent: Sun 11/18/2007 1:14 PM
> To: Jim Cun; Friends of Triumph
> Subject: Re: [Fot] Alloy v steel
>
> Alloy flywheels seem harder to keep attached to the crankshaft.  With
> proper care, they work well, though.  They seem to be more
> troublesome in the 6 cylinder motors, anecdotally.
>
> - Tony
>
> At 03:01 PM 11/18/2007, Jim Cun wrote:
>>Hi Guys,
>>           Just wanted to ask your thoughts on an alloy flywheel vs
>>steel for a TR race car?
>>
>>Regards Jim
>>
>>
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