?What would be the best approach to drilling a second dowel hole in the
flywheel? Should you index to the second hole in the stock TR3/4 crank?
On Mon, Jun 5, 2017 at 6:22 PM, Steve Yott via Fot <fot at autox.team.net>
wrote:
> Properly made and installed that would be an good solution. Issue is that
> if they are not sized properly and they should have a t-shape and be
> counter sunk they can cause even worse failure.
>
>
>
> The right bolt used with the proper washer has a very large surface area
> and the bolt itself is shouldered resulting in a pretty strong install.
>
>
>
> The next best thing to do IMHO is to install a second dowel pin. The real
> purpose of the bolt is to hold the flywheel onto the crank but the main
> strength is the counter sunk flywheel over the face of the crankshaft and
> the dowels holding the rotation forces. This way if the bolts should break
> you have two dowels which will prevent the flywheel from flying in an egg
> shape and destroying everything in its path.
>
>
>
> Now the absolute best thing is to not use an aluminum flywheel! There is
> a reason they are not allowed in Europe?.. Buy a steel flywheel and use 6
> to 8 bolts then most of the issues are gone.
>
>
>
> IMHO
>
>
>
> Steve Yott
>
>
>
> *From:* Scott Janzen [mailto:sjanzen at me.com]
> *Sent:* Monday, June 05, 2017 3:28 PM
> *To:* Barr, Scott <sbarr at McCarty-Law.com>
> *Cc:* timmmurphh at gmail.com; Steve Yott <tr4 at wi.rr.com>; STEPHEN
> BOROWSKI <
> biznzman at pacbell.net>; FOT <fot at autox.team.net>
> *Subject:* Re: [Fot] TR4 ARP Flywheel Bolts Question
>
>
>
> Don't you guys use steel inserts in those flywheel holes?
>
> Sent from my iPhone
>
>
> On Jun 5, 2017, at 7:55 AM, Barr, Scott via Fot <fot at autox.team.net>
> wrote:
>
> This is what it looks like if you forget to chamfer the flywheel holes to
> clear the radius under the head.
>
>
>
> <image001.jpg>
>
>
>
> *From:* Fot [mailto:fot-bounces at autox.team.net
> <fot-bounces at autox.team.net>] *On Behalf Of *timmmurphh--- via Fot
> *Sent:* Sunday, June 04, 2017 5:53 PM
> *To:* 'Steve Yott' <tr4 at wi.rr.com>; 'STEPHEN BOROWSKI' <
> biznzman at pacbell.net>; fot at autox.team.net
> *Subject:* Re: [Fot] TR4 ARP Flywheel Bolts Question
>
>
>
> Thanks for the clarification Steve, that makes sense.
>
>
>
> Tim
>
>
>
>
>
> *From:* Steve Yott [mailto:tr4 at wi.rr.com <tr4 at wi.rr.com>]
> *Sent:* Sunday, June 4, 2017 4:56 PM
> *To:* timmmurphh at gmail.com; 'STEPHEN BOROWSKI' <biznzman at pacbell.net>
> *Subject:* RE: [Fot] TR4 ARP Flywheel Bolts Question
>
>
>
> The reason they state to not use washers is they are afraid that the
> washers used will (1) not be hard enough and will compress under the bolt
> head and (2) all ARP bolts have very liberal radii between the head and
> shank. If there is a tight fitting washer this would be strain on this
> radius and could break the head.
>
>
>
> The 7/16? ARP bolts used on Chevy flywheels is what I fit to TR?6, late
> Spitfires and modified TR4 cranks. These bolts come with the special
> washers to use with them. I have used a proper washer under the 3/8? ARP
> bolts many times with no problems using a correct washer. You can also use
> an ARP crown wheel bolt for the same purpose and these come with proper
> washers.
>
>
>
> Steve Yott
>
>
>
> *From:* Fot [mailto:fot-bounces at autox.team.net
> <fot-bounces at autox.team.net>] *On Behalf Of *timmmurphh--- via Fot
> *Sent:* Sunday, June 04, 2017 1:59 PM
> *To:* 'STEPHEN BOROWSKI' <biznzman at pacbell.net>; fot at autox.team.net
> *Subject:* Re: [Fot] TR4 ARP Flywheel Bolts Question
>
>
>
> FWIW
>
>
>
> I just got a set of ARP 206-2802 flywheel bolts from Pegasus for the TR4.
> They are for ?BMC A series?. The instruction specifically says, ?DO NOT
> USE ANY WAHERS?, yes, all in caps for emphasis! They further state that
> ARP will not be responsible for failures is washers are used. The
> instructions also say, ?Make sure there is an adequate chamfer under the
> bolt holes on the flywheel to clear the radius under the head of the
> bolt.? Torque is 55 Ft-Lb with specified lubricants on the threads.
>
>
>
> I?ve never had that much good luck grinding the ends of bolts and still
> having it square so as not to start it cocked and runing the female
> threads. Maybe it?s just me?
>
>
>
> Tim
>
>
>
>
>
> *From:* Fot [mailto:fot-bounces at autox.team.net
> <fot-bounces at autox.team.net>] *On Behalf Of *STEPHEN BOROWSKI via Fot
> *Sent:* Friday, June 2, 2017 3:28 PM
> *To:* FOT List <fot at autox.team.net>
> *Subject:* [Fot] TR4 ARP Flywheel Bolts Question
>
>
>
> Does anyone have experience using the ARP flywheel bolts sold by Moss and
> others?
>
> I understand that you may have to shorten the bolt or it breaks the rear
> seal???
>
> Are they supposed to have a washer or not?
>
>
>
> Thxs. Steve
>
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
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>
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