[DeTomaso] Christmas is coming . . .

[Asa Jay Laughton]

I know it's not even Halloween yet, but if you don't get a jump on it 
now, you may miss out.
The POCA Club store has some brand new merchandise just in time for the 
holidays.

All POCA members will see this ad in the December Newsletter, but you 
can check it out early by clicking here:
http://www.panteraclub.com/store/POCA ad Christmas 07.pdf 
<http://www.panteraclub.com/store/POCA%20ad%20Christmas%2007.pdf>

Then put your orders in fast to ensure delivery before Christmas.

Asa Jay
<note, not all products are politically incorrect.>   :)

Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1973 Pantera L 5533
[ASASCAT]
    
******************************     
http://www.asajay.com
http://www.351c.info
  



John Bentley (jab) wrote:
> For those interested in engine engineering, I recently had an email
> exchange with my Dad (engine designer at Ford) on pros and cons of the 2
> and 4-bolt blocks.  Here is what he had to say.....
>  
> ************************
> 2bolt/4bolt
> The V engines produce high main bearing loads due to gas loads at
> approx. 45 deg. from the horizontal, and as the RPM increases the high
> loads are produced at all angles. Sideways loads to the right cause the
> left outboard side of the cap to lift away from the block. When the
> bolts are near the bearing bore as in the 390/428, the contact pressure
> between the block and cap is quite uneven, which makes lift-off easier.
> The higher the side load, the more the lift-off. When the lift-off gets
> near the c'bore for the bolt, fretting occurs on the saddle face and a
> fatigue crack starts (crack is in fore-aft direction). The crack
> progresses up the hole and thread until complete failure occurs. The
> extra 2 bolts were introduced to prevent the parallel-o-gramming
> lift-off.
>
> However, if the main bearing bolts are located farther outboard towards
> the center of the contact pad, the contact pressure is more even and the
> lift-off is minimized or prevented.
>
> The 351C and 460 bolts are rather well placed, and that type of bulkhead
> failure never occurred (that I know of, in production engines).
>
> There is no functional disadvantage to having 4 bolts, but it provides a
> margin of safety not generally needed.
>
> One disadvantage of an aluminum block is that it has no endurance limit
> and therefore stressed areas will fail someday.
>
> ********************************
>  
> I guess I read from that you don't have to search the earth for a 4-bolt
> block unless you are building a pretty high HP engine.
>  
> FWIW,
>  
> JB
>
>  
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