And regarding flywheel bolts?usually the dowels are a pretty tight fit?tighter
than the shoulders of the bolts. They are also square and better for resisting
rotational force. I think flywheels slip and slide?not much of course, but
there?s a lot of force applied there. I?m equally comfortable with more hard
bolts than stock. Six is good, eight is better. But a couple of dowels is nice
too. I don?t think they simply locate.
> On Jun 22, 2017, at 4:34 PM, Mordy Dunst via Fot <fot at autox.team.net>
> wrote:
>
> Here is a thought question: could you reduce rate of a car spinning about
> its center of mass by reving the flywheel faster in neutral?
>
>
> MDunst Headgasket.com 626.358.1616
> Fax 626.628.3777
> Triple R Munitions, Inc 626.201.9471
> T FFL 6,7 SOT 2
>
> On Thursday, June 22, 2017, Christian Marx via Fot <fot at autox.team.net>
> wrote:
>
> My thought is that a dowel pin has no other function than matching the parts
> together. The pin is not a press fit in most cases.
>
> This means, if the dowel pin get rotational forces, then all is too late and
> the car has to be parked.
>
>
>
> The rotational force get transferred by the clamping force and the resulting
> friction between fly wheel an crank only.
>
>
>
> Cheers
>
> Chris
>
>
>
> Gesendet von meinem Windows 10 Phone
>
>
>
> Von: Steve Yott via Fot
> Gesendet: Donnerstag, 22. Juni 2017 12:55
> An: 'Scott Janzen'; 'Barr, Scott'
> Cc: 'FOT'
> Betreff: Re: [Fot] TR4 ARP Flywheel Bolts Question
>
>
>
> 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] 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]
> 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] 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] 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
>
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