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03-21-2021, 06:43 PM | #41 |
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Join Date: May 2010
Location: Mill Valley, Calif.
Posts: 120
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Re: Center main blowout
Maybe some one posted this and I missed it. It looks to me like there wasn't enough thread on those bolts and they tightened up before clamping the main.
As mentioned they could have bottomed out also. |
03-21-2021, 07:08 PM | #42 |
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Join Date: Feb 2011
Posts: 794
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Re: Center main blowout
Doubtful, as any 8BA I have seen has the holes tapped right thru (no bottom) and the threads don't start until appox. 3/8" below the surface.
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03-21-2021, 07:48 PM | #43 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,312
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Re: Center main blowout
Two words : Three mains.
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03-22-2021, 04:40 AM | #44 |
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Join Date: Jan 2011
Location: Central Ohio
Posts: 5,064
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Re: Center main blowout
Just takes a few "band aids" - and then you can throw horsepower at 3 mains. This is the girdle I designed for our 1940 Flathead Cadillac we run at Bonneville. We've made 650 HP on alky - and the bearings still looked great.
I'm designing one for the Flathead Ford as I write - but it will be for a 5 main crank (with 2 girdle/ghost mains in it). GirdleAndMains2.jpg |
03-23-2021, 08:23 AM | #45 |
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Join Date: Jun 2010
Location: Perry OH
Posts: 1,330
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Re: Center main blowout
Metal fatigue does happen. Has a qualified Metallurgist examined the parts ?
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03-23-2021, 10:47 AM | #46 |
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Join Date: May 2014
Location: Lafayette, La.
Posts: 100
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Re: Center main blowout
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03-23-2021, 04:09 PM | #47 |
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Join Date: Dec 2015
Location: Marana, AZ.
Posts: 414
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Re: Center main blowout
A pic of the fracture face will tell a lot.
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03-23-2021, 04:47 PM | #48 |
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Join Date: Dec 2010
Location: East Coast in CT
Posts: 1,529
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Re: Center main blowout
Ive seen the bearing cap in this post. And also the main bearing that was in the cap. You can see a definite etched mark in the rear of the bearing shell where the crack was located. To make such a mark this crack was there for some time how long is the mystery. The owner came by my shop looking for center main caps I was able to loan him eight caps maybe he will get lucky and find one that will work. If what some have posted a cap form another block will work you certainly need a good amount of caps to try and hopefully get lucky time will tell. The owner also has plasti gauge to check clearances if he finds a cap that appears to work. He understands the complexity of this.
Heck I think he should buy a lottery ticket if he finds a cap that works. Ronnieroadster
__________________
I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
03-24-2021, 06:15 AM | #49 |
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Join Date: Jan 2011
Location: Central Ohio
Posts: 5,064
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Re: Center main blowout
Thanks Ron - from lookin at the picture and seeing a 'shiny area' around the cap break - suspected that the cap cracked first, then finally the bolts let go. If the guy gets away with finding the "magic cap" and the crank isn't hurt - then he is a whole lot more fotunate than I'd expect to be! I'd probably be collecting the lower end of the engine in a wheel barrow! LOL. Give Laura my best - hope you are doing well!
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03-24-2021, 06:51 AM | #50 |
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Join Date: May 2010
Location: Chester Vt
Posts: 8,860
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Re: Center main blowout
I sent him 5 caps and some stock bolts.
Gramps |
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