[Fot] Center main support

Sun Nov 24 16:58:39 MST 2019

Ist das nicht ein schnitzel bank?Ja, das ist ein schnitzel bank!

Bill Dentinger

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 On Sunday, November 24, 2019, Steven Belfer via Fot <fot at autox.team.net> wrote:

Mmmmmmm schnitzel 

~Steve

On Nov 24, 2019, at 3:29 PM, Chris Marx via Fot <fot at autox.team.net> wrote:

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To add:

The reason for the deformation of the crank is cause by the ignition forces.

The rod is hammering on one place of the bearing journal and like a Schnitzel it expands at that place from hammering on which bends the crank.

Simple as that J

Cheers

Chris

Von: Fot <fot-bounces at autox.team.net> Im Auftrag von Phil Gott via Fot
Gesendet: Sonntag, 24. November 2019 22:03
An: Friends Of Triumph <fot at autox.team.net>
Betreff: Re: [Fot] Center main support

Interesting, Chris:

My machine shop said that .002” run out at the center main, with the crank supported and spun on numbers 1 and 3 was a sign that it was developing high levels of internal stress (work hardening) and that it should be retired. They aim for 0 run out under these conditions. Based on what you’ve said, I wonder if they are being overly cautious. As they do not grind cranks themselves ( only polishing and balancing), they had little to gain from that diagnosis.
Thanks for the input.

Sent from my iPhone

On Nov 24, 2019, at 9:26 AM, Tony Drews <tony at tonydrews.com> wrote:

Wow!  It's very nicely done.  Certainly overkill.

Regards, Tony

On 11/23/2019 9:11 PM, Phil Gott wrote:

Here are some photos: 

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<image1.jpeg>

<image2.jpeg>

Sent from my iPhone

On Nov 23, 2019, at 12:23 PM, Tony Drews <tony at tonydrews.com> wrote:

I agree, that sounds like overkill.  Mine only requires the top of the cap to be machined flat, no other block mods.

Regards, Tony

On 11/23/2019 5:42 AM, Phil Gott wrote:

Thanks again, Tony: 

The one we have, built by the late Bill  Throop, in addition to reinforcing the cap itself, has the block machined internally to accept the sides of a strap, then the strap  is cross bolted from the sides, through the block from outside.  I’m wondering if this is a bit of overkill. Based on your recommendation, it seems to be.

Maybe I can send some pictures later today, as we are pulling the engine today for other work.

Phil

Sent from my iPhone

On Nov 22, 2019, at 10:56 PM, Tony Drews <tony at tonydrews.com> wrote:

I run that setup, it was an uncle jack trick.  Here's what he wrote about that (on my engine building tips page):

"I also like to strap the center main to add rigidity to the bottom end.  To do this, mill off the cast face of the main flush with the surfaces for the head bolts. Get a front strap for a Chevy 400 block. You must enlarge the holes in the strap  and you must use longer bolts.  Some  builders feel that this is totally unnecessary, but since starting to do this, I have never had a main bearing deteriorate faster than a rod bearing, which is something that happens more frequently than you would expect."

Regards, Tony Drews

On 11/22/2019 3:58 PM, Phil Gott via Fot wrote:

Has anyone seen the need to add extra support to the center main on the TR wet sleeve engine? We have an engine that has a steel bridge cross-bolted underneath and supporting the center main cap. Is this needed? Just took 3 factory cranks to the machine shop and all three were bent about .002 in (.002 run out at center main when supported on first and last mains.) Two of these were raced, the third was removed from a tired street engine. note: None of these cranks came out of the engine with extra support at the center.Curious as to the need for the extra support.Thanks,Phil Gott114 TR4A  Sent from my iPhone_______________________________________________fot at autox.team.net  http://www.fot-racing.com  Donate: http://www.team.net/donate.htmlArchive: http://autox.team.net/archive http://www.team.net/pipermail/fotUnsubscribe/Manage: http://autox.team.net/mailman/options/fot/tony@tonydrews.com      

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