[6pack] Aluminum Engine Plates

[Navarrette, Vance]

        Joe:

        Sounds like you have lots of data saying that it is not an issue.
Personally, I always prefer data to a SWAG, which is what my comment was. I
was just wondering if it could be an issue. Aluminum rocker arms are a place
where I know this can really occur, although with computer aided stress
analysis, I think the newer designs are pretty sound. The old hot rod rule of
thumb was that aluminum rockers were only good for 50,000 miles.

        Vance


    Vance Navarrette
    Cogito Ergo Zoom
    I think, therefore I go fast

-----Original Message-----
From: N197TR4 at cs.com [mailto:N197TR4 at cs.com]
Sent: Tuesday, September 09, 2008 12:40 PM
To: Navarrette, Vance; John Cyganowski; "6pack at autox.team.net"
Subject: Re: [6pack] Aluminum Engine Plates

Vince and all.

I have not one report of any fatique failures on any of the alloy engine
plates, I manufacture, including the one I have run for about five years on
the front of my TR............. which is also the mounting points for the
engine.

Not that it cant happen...but if it does I will replace at no charge.

Joe Alexander
>From The Targa Newfoundland...well in a couple of days.  :-)
>        John:
>
>        Don't forget about fatigue resistance. Aluminum has poor fatigue
life
>compared to steel. While the front engine plate is lightly stressed and
would
>be a good candidate for replacement, the rear plate is what melds the engine
>into a single unit. The front of the engine and the rear of the tranny are
>supported, but there is not support near the rear engine plate.
>        I would worry about flex between the two components, and resulting
>cracks in the plate. I think to really answer that questions would require
>some stress analysis. Intuitively, it seems questionable as to the longevity
>of an identical rear plate fabricated from alloy. Just my $0.02.
>
>        Vance
>
>
>    Vance Navarrette
>    Cogito Ergo Zoom
>    I think, therefore I go fast
>
>-----Original Message-----
>From: 6pack-bounces+vance.navarrette=intel.com at autox.team.net
>[mailto:6pack-bounces+vance.navarrette=intel.com at autox.team.net] On Behalf
Of
>John Cyganowski
>Sent: Sunday, September 07, 2008 5:47 PM
>To: 6pack at autox.team.net
>Subject: [6pack] Aluminum Engine Plates
>
>Hi All-
>
>Looking for some thoughts on the aircraft grade aluminum engine plates?  The
>front one and the Transmission support plate.  Are these strong enough?
>
>John Cyg
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