Would a girdle that spans the bottom of the block help? I remember
researching the Rover/Buick 215ci V8 engine and I saw that racers sometimes
bolted a plate between the bottom of the crank and the oil pan to keep the
block from flexing and cracking. This was on earlier castings when the
displacement was taken up to the max, before webbing changes were
introduced.
Mark Weathers
>From: "Dean Tetterton" <Richtr@erols.com>
>Reply-To: "Dean Tetterton" <Richtr@erols.com>
>To: "Friends of Triumph" <fot@autox.team.net>
>Subject: Moldex Crank, Bearing width, Rods
>Date: Thu, 26 Aug 2004 10:12:59 -0400
>
>OK so we build a crank that last and rods that don't break. Now what block
>are
>we going to put it in?
>I am seeing a lot of cracked blocks in the webbing between 2 & 3 and
>radiating
>out from the center
>main. I think with crank flex, there is block flex and they all take their
>toll. IN the dark ages, early
>to mid 60's, it was common to limit revs to 6500 and change cranks after
>every
>4 race weekends. When
>taken out they usually showed cracks in the 4th rod bearing or rear main.
>Back
>then new cranks were
> around $400 and a lot of those cracked crankshafts were put in street
>motors
>and lasted for years.
>
>So now we all promise to keep our rev's below 6000 and we all have a good
>time.....of course when
>that 356 is in your mirror that goes out the window. How about it Henry?
>Promise to shift at 6000?
>
>Dean
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